20070807.ba v04_n076.bam.20070807 >From ???@??? Tue Aug 7 08:56:57 2007 -0500 Date: Tue, 7 Aug 2007 13:55:58 GMT From: Old Tube Radios To: Old Tube Radios Subject: BOATANCHORS digest 4076 Message-Id: <20070807135559.7397447010D@srvr1.theporch.com> BOATANCHORS Digest 4076 Topics covered in this issue include: 1) parts needed- Heath SB- HW by wb3fau@att.net 2) Collins 516F-2 Choke Large by W6cds@aol.com 3) 515F-2 Choke is sold by W6cds@aol.com 4) Coil winders anyone? by "John Gillespie" 5) KSM Testing on RTTY by Richard Dillman 6) Fw: The ARRL Letter, Vol 26, No 31 (Friday, August 3, 2007) by "JAMES HANLON" 7) Re: Coil winders anyone? by "David Stinson" 8) Speaker by "Bob Kemp" 9) Re: The ARRL Letter, Vol 26, No 31 (Friday, August 3, 2007) by "Arden Allen" 10) Re: Speaker by "Arden Allen" 11) Morse Code -- was The ARRL Letter, Vol 26, No 31 (Friday, August 3, 2007) by "provero" 12) Freebe! by W7QHO@aol.com 13) Re: Speaker by wb3fau@att.net 14) Ceramic cap 'drift' by stuck in 50s 15) Re: Ceramic cap 'drift' by wb3fau@att.net 16) Re: Ceramic cap 'drift' by "Al Parker" 17) Weston Surface Mount Meter by W6cds@aol.com 18) G76 relays - but wait, that's not all by stuck in 50s 19) Re: Coil winders anyone? by "John Gillespie" 20) Re: Coil winders anyone? by spr@earthlink.net 21) Re: Coil winders anyone? by "John Gillespie" 22) What's Up with 6HS6?? by "David Stinson" 23) Re: What's Up with 6HS6?? by "Morris Odell" 24) Re: What's Up with 6HS6?? by Garey Barrell ---------------------------------------------------------------------- From: wb3fau@att.net To: Old Tube Radios Subject: parts needed- Heath SB- HW Date: Fri, 03 Aug 2007 17:51:13 +0000 Message-Id: <080320071751.9222.46B36B110007B1170000240621602810609A0E00CC0D99@att.net> Can't find anything yet, so back here at BAs. Specifically, xtals and an 80m osc coil for an SB313 rx. crystals are- 12.395mc and 22.895mc. Parts are common use in SB and HW rigs. anyone have a parts radio for sale or leads? Russ. ------------------------------ From: W6cds@aol.com Message-ID: Date: Fri, 3 Aug 2007 16:40:11 EDT Subject: Collins 516F-2 Choke Large To: Old Tube Radios MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1186173611" -------------------------------1186173611 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit COLLINS 516F-2 CHOKE (L1/L2) (Peter Dahl's) 200 OHMS P/N 668-0300-00 ORE) EI-100 X 1 STYLE #) 06 E-I LAMINATED CORE PR) 8 HY @ 175MA DC Freed #37256 5.00 Plus S&H FOB El Paso, TX WEIGHT) 5 LBS We seem to have diff versions of the 516F-2 choke. The one I have is a double stacked unit. So lets try again. Make offer plus shipping. Charles D Simmons - W6cds PO Box 6238 Buena Park, CA 90622-6238 Phone 714-994-6843 ************************************** Get a sneak peek of the all-new AOL at http://discover.aol.com/memed/aolcom30tour -------------------------------1186173611 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ---REMAINDER OF MESSAGE TRUNCATED--- * * This post contains a forbidden message format * * (such as an attached file, a v-card, HTML formatting) * * Mail Lists at theporch.com only accept PLAIN TEXT * * If your postings display this message your mail program * * is not set to send PLAIN TEXT ONLY and needs adjusting * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -------------------------------1186173611-- ------------------------------ From: W6cds@aol.com Message-ID: Date: Fri, 3 Aug 2007 16:55:18 EDT Subject: 515F-2 Choke is sold To: Old Tube Radios MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1186174518" -------------------------------1186174518 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Choke sold for $50 plus shipping. Thanks all. Charles w6cds ************************************** Get a sneak peek of the all-new AOL at http://discover.aol.com/memed/aolcom30tour -------------------------------1186174518 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ---REMAINDER OF MESSAGE TRUNCATED--- * * This post contains a forbidden message format * * (such as an attached file, a v-card, HTML formatting) * * Mail Lists at theporch.com only accept PLAIN TEXT * * If your postings display this message your mail program * * is not set to send PLAIN TEXT ONLY and needs adjusting * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -------------------------------1186174518-- ------------------------------ Message-ID: <000001c7d6b2$f6affd40$3630bb40@k9a1e1> From: "John Gillespie" To: Old Tube Radios Subject: Coil winders anyone? Date: Sat, 4 Aug 2007 12:15:52 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: 7bit heres a problem that comes up once in a blue moon I am restoring a 1937 radio and find an open RF coil. I have had some previous luck fixing some old coils, but this one has an open, right inside the coil and must be replaced. The coil in question is wound with what looks to be litz wire. the coil is about 1/4" wide and stands about 1/2" off the coil form. One of those tall narrow coils, nothing easy! I hate condeming a radio to be a parts donor. Finding a replacement will be just about impossible, but then miracles do happen. Question is: is there anyone out there that rewinds coils, or more appropriately, does anyone have a coil winder they would like to part with or know of a source for a reasonably (inexpensive) priced coil winder? Considering we only rewind coils once in a blue moon HiHi. thanks.... john ------------------------------ Message-ID: <3853944.1186256724279.JavaMail.root@mswamui-chipeau.atl.sa.earthlink.net> Date: Sat, 4 Aug 2007 19:45:24 +0000 (GMT+00:00) From: Richard Dillman To: Old Tube Radios Subject: KSM Testing on RTTY Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit ZCZC KSM will be testing its 12Mc RTTY transmitter today, Saturday 4 August, beginning at about 2000 GMT. Tests will begin with FEC, then Baudot (45bd), then back to FEC. Since this is our first test occasional interruptions may be expected. Power is 2kW, somewhat less than we will eventually use. The frequency is: 12631.0 Future tests will include our second RTTY frequency, 8433.0, but for today only 12Mc will be on the air. Signal reports would be appreciated. Best Regards, Richard Dillman Chief Operator, MRHS NNNN ------------------------------ Message-ID: From: "JAMES HANLON" To: Old Tube Radios Subject: Fw: The ARRL Letter, Vol 26, No 31 (Friday, August 3, 2007) Date: Sat, 4 Aug 2007 17:01:18 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002A_01C7D6B9.13506C40" This is a multi-part message in MIME format. ------=_NextPart_000_002A_01C7D6B9.13506C40 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Here's an interesting item from the ARRL Letter, Friday, August 3. Jim, W8KGI * Morse Code Study in Pennsylvania: A psychology professor at the University of Pittsburgh is conducting a study involving short-term memory and how it correlates to Morse code. Julie Fiez, the study's principal investigator, said she got the idea of using Morse code in her studies from a family member who is an Amateur Radio operator. She said she liked the idea of using CW in her experiments to see how people process audio tones. "Our interest is in verbal working memory," she said, "which is the ability to keep 'on-line' for a short time, information you can access later." Part 1 of the experiment is an assessment of the participant's Morse proficiency. First, participants will be asked to accurately copy sentences as they are presented in Morse at three different rates (16, 19, and 25 words per minute). Then they will be asked to listen to the entire Morse sentence and recall the sentence from memory. Part two asks participants to recall lists of letters from memory. The letters will either be in English or in Morse. Participants will either hear the letters through headphones or see them on a computer screen. The study will look for differences in memory performance between Morse lists and English lists. The research study is expected to continue through the fall. If you would like to participate, please contact the research team via e-mail = >. Thanks to Tom Mitchell, WY3H, and the Leader Times, part of the Pittsburgh Tribune-Review family of newspapers, for some information ------=_NextPart_000_002A_01C7D6B9.13506C40 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ---REMAINDER OF MESSAGE TRUNCATED--- * * This post contains a forbidden message format * * (such as an attached file, a v-card, HTML formatting) * * Mail Lists at theporch.com only accept PLAIN TEXT * * If your postings display this message your mail program * * is not set to send PLAIN TEXT ONLY and needs adjusting * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ------=_NextPart_000_002A_01C7D6B9.13506C40-- ------------------------------ Message-ID: <001801c7d6f2$bee1d790$6401a8c0@boudreaux> From: "David Stinson" To: Old Tube Radios Subject: Re: Coil winders anyone? Date: Sat, 4 Aug 2007 18:54:03 -0500 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="Windows-1252"; reply-type=original Content-Transfer-Encoding: 7bit ----- Original Message ----- From: "John Gillespie" To: "Old Tube Radios" Sent: Saturday, August 04, 2007 11:15 AM Subject: Coil winders anyone? > heres a problem that comes up once in a blue moon > > I am restoring a 1937 radio and find an open RF coil.... To get the radio playing, perhaps you could do a work-around. With some circuit adjustment, a close approximation could work. Is it a single winding coil? Can you determine the value of the tuning cap across it? If so, you can calculate the inductance needed. Adding a primary winding, if needed, wouldn't be too tough. It may not track exactly, but will get the radio on line until a better solution is at hand. Regards, D.S. ------------------------------ Message-ID: <000901c7d6f5$c9c1c780$6701a8c0@radio> From: "Bob Kemp" To: Old Tube Radios Subject: Speaker Date: Sat, 4 Aug 2007 19:15:53 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Does any have a source for the speaker in a Swan 117XC supply. It's a 4" speaker with 3-1//4" mounting holes. Problem with the new substitutes is the magnet it way too large of a diameter to nestle in - in front of the p/s. The original is a Jensen Concert series and the little shield or magnet hold down(on the rear of the speaker) is about 1 1/4" x 1 3/8". Tried various sources and no luck! Bob wa0vrc ================================ Bob Kemp Phone: 651-345-5345 FAX: 651-345-2707 mailto: bkemp@bobkemp.com website: http://www.bobkemp.com ================================ ------------------------------ Message-ID: <004101c7d709$b183f080$179e480c@KB6NAX> From: "Arden Allen" To: Old Tube Radios Subject: Re: The ARRL Letter, Vol 26, No 31 (Friday, August 3, 2007) Date: Sat, 4 Aug 2007 19:24:18 -0700 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit * Morse Code Study in Pennsylvania: A psychology professor at the University of Pittsburgh is conducting a study involving short-term memory and how it correlates to Morse code. ..... What rots quicker, apples or oranges? Sounds like nonsense contrived to get a research grant! Arden Allen KB6NAX ------------------------------ Message-ID: <004201c7d709$b2b89ff0$179e480c@KB6NAX> From: "Arden Allen" To: Old Tube Radios Subject: Re: Speaker Date: Sat, 4 Aug 2007 19:38:15 -0700 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit > Does any have a source for the speaker in a > Swan 117XC supply. It's a 4" speaker with > 3-1//4" mounting holes. Will Mouser stock number 253-2044 fit? Look at datasheet for dimensions. Arden Allen KB6NAX ------------------------------ From: "provero" To: Old Tube Radios Subject: Morse Code -- was The ARRL Letter, Vol 26, No 31 (Friday, August 3, 2007) Date: Sun, 05 Aug 2007 07:36:31 -0500 Message-id: <46b5c44f.2f4.4566.1620380063@ct.metrocast.net> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" My wife learned a bit of Morse Code in high school (just enough to get her a guy in the ham radio club, going on 40 years ago). Never got a ticket, but still remembers Morse at 5 wpm to this day. Josh, KK1D ----- Original Message Follows ----- From: "Arden Allen" To: Old Tube Radios Subject: Re: The ARRL Letter, Vol 26, No 31 (Friday, August 3, 2007) Date: Sat, 4 Aug 2007 19:24:18 -0700 >* Morse Code Study in Pennsylvania: A psychology professor >at the University of Pittsburgh is conducting a study >involving short-term memory and how it correlates to Morse >code. ..... ------------------------------ From: W7QHO@aol.com Message-ID: Date: Sun, 5 Aug 2007 13:33:01 EDT Subject: Freebe! To: Old Tube Radios CC: Milsurplus@mailman.qth.net, boatanchors@theporch.com MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_ceb.16f3bef9.33e763cd_boundary" --part1_ceb.16f3bef9.33e763cd_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit All, GP-7, restorable but victim of a bad packing job sent through UPS. Bowl insulator on LH side broken and the power/control connector bracket oh the other side bent. Toggle switch also missing on front panel but otherwise complete and unscathed as far as I can tell. No tubes. Comes with the MF TU in place. All packed up (very well this time) and ready to go. Free for the shipping from 91207. Heavy, about 80 lb. packed. Dennis D. W7QHO Glendale, CA ************************************** Get a sneak peek of the all-new AOL at http://discover.aol.com/memed/aolcom30tour --part1_ceb.16f3bef9.33e763cd_boundary Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ---REMAINDER OF MESSAGE TRUNCATED--- * * This post contains a forbidden message format * * (such as an attached file, a v-card, HTML formatting) * * Mail Lists at theporch.com only accept PLAIN TEXT * * If your postings display this message your mail program * * is not set to send PLAIN TEXT ONLY and needs adjusting * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * --part1_ceb.16f3bef9.33e763cd_boundary-- ------------------------------ From: wb3fau@att.net To: Old Tube Radios Cc: "Bob Kemp" Subject: Re: Speaker Date: Sun, 05 Aug 2007 18:11:33 +0000 Message-Id: <080520071811.1994.46B612D50006C807000007CA21602807489A0E00CC0D99@att.net> Bob, can you send a picture of it? Maybe help if we see it? ------------------------------ Date: Sun, 5 Aug 2007 15:17:04 -0400 (EDT) From: stuck in 50s Message-Id: <200708051917.l75JH4n5000045@fracas.netboobie.org> To: Old Tube Radios Subject: Ceramic cap 'drift' We went thru this study a couple of weeks back & it rang a bell of the horrid T-coef of hi-cap LV disc ceramics Well iI was blessed again. This time on a Gonset G76 with a a drifting resonance point. Turn out the 80m 100pf padder was a 6kv disc. Changed it out for a 5kv mica this AM & all's well Good thread recently on these phenom.s Marty aka aa4rm ------------------------------ From: wb3fau@att.net To: Old Tube Radios Cc: stuck in 50s Subject: Re: Ceramic cap 'drift' Date: Sun, 05 Aug 2007 19:25:24 +0000 Message-Id: <080520071925.26760.46B624240002957B0000688821602807489A0E00CC0D99@att.net> Yes, the funny thing about these failures is, no-one expected you to be using this old guy, some 50+ years down the road. Another potentially dangerous application is in the Collins 32V transmitters, a large plate blocking cap shorts to ground! Who would ever think these would fail? Russ. ------------------------------ Message-ID: <16cb01c7d7a3$2af21de0$6401a8c0@reloaded> From: "Al Parker" To: Old Tube Radios Subject: Re: Ceramic cap 'drift' Date: Sun, 5 Aug 2007 16:56:59 -0400 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit Hey -- (that's what they say in parts of the So.) maybe that's what's happening in my NC-183D. It drifts abt 20kc, on the BC band, for 15-30 min. after turn-on. I'll get a look & see what's visible on the skem. b4 houling it out on the bench. I wasn't looking fwd to hours with a freq. ctr on various oscillators. 73, Al, W8UT ----- Original Message ----- From: "stuck in 50s" To: "Old Tube Radios" Sent: Sunday, August 05, 2007 3:17 PM Subject: Ceramic cap 'drift' > > We went thru this study a couple of weeks back & it rang a bell of > the horrid T-coef of hi-cap LV disc ceramics > > Well iI was blessed again. This time on a Gonset G76 with a > a drifting resonance point. Turn out the 80m 100pf padder was a > 6kv disc. Changed it out for a 5kv mica this AM & all's well > > Good thread recently on these phenom.s > > Marty aka aa4rm ------------------------------ From: W6cds@aol.com Message-ID: Date: Sun, 5 Aug 2007 17:16:52 EDT Subject: Weston Surface Mount Meter To: Old Tube Radios MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1186348612" -------------------------------1186348612 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Very pretty Weston Model 528 Surface Mount AC Voltmeter. Has 3 ranges, 0-4, 0-8, 0-150 vac Meter 2 1/2" dia w/3" base w/ tab & 4 banana jacks marked High, Med, Low & Plus/Minus, 2" high Pretty Red/Blk color with silver/white face. Excellent condition. Make offer plus shipping for 1 lb. Charles D Simmons - W6cds PO Box 6238 Buena Park, CA 90622-6238 Phone 714-994-6843 ************************************** Get a sneak peek of the all-new AOL at http://discover.aol.com/memed/aolcom30tour -------------------------------1186348612 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ---REMAINDER OF MESSAGE TRUNCATED--- * * This post contains a forbidden message format * * (such as an attached file, a v-card, HTML formatting) * * Mail Lists at theporch.com only accept PLAIN TEXT * * If your postings display this message your mail program * * is not set to send PLAIN TEXT ONLY and needs adjusting * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -------------------------------1186348612-- ------------------------------ Date: Mon, 6 Aug 2007 06:40:50 -0400 (EDT) From: stuck in 50s Message-Id: <200708061040.l76AeoDa004290@fracas.netboobie.org> To: Old Tube Radios Subject: G76 relays - but wait, that's not all Besides the drifty ceramic tank padder, there were 2 of 3 contact-pairs intermittant on one of the two 3pdt relays. Removal of same looked to be awful. So I tried a shortcut when I guessed the armature cud be removed by loosening the screw-pair visible from above. Sure 'nuff! But the flex-lead on the rly left side req'd unsoldering to complete the action. Then I employed an ancient trick I've never seen here. That's cutting a .25" x 2" strip from a dollar bill, wrapping it around a small screw- driver end, & dipping same in PepBoys contact cleaner (Deoxit if you've $$$). Then work that rough paper & chemical on each contact & voila - back come the shinies. G76 again running steady as a rock. 'rm aka marty ------------------------------ Message-ID: <001c01c7d828$c3cc8340$8531bb40@k9a1e1> From: "John Gillespie" To: Old Tube Radios Cc: "old tube radios" Subject: Re: Coil winders anyone? Date: Mon, 6 Aug 2007 08:53:17 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Hi Russ Its just one tall thin primary coil on a largish phenolic coil form, one wire in at the base and one wire out at the outer layer. Wires out to the terminals are unbroken and resoldering the terminals had no effect. We have continuity from the terminals to the very last spot on the wires before they disappear into the coils. This would suggest to me that there is a break inside the coil itself. The coil has no visible heat or electrical damage. The coil was totally covered in a very thick coating of white wax. I hadn't seen before, almost looked like latex, but it melted off like wax with no smell. Although a pain, it looks like a relatively easy coil to rewind if I had access to a coil winder. There are plans on the net for a homemade coil winder that looks possibly do-able. The only hitch in rewinding this coil is that it is tall and narrow. Doesn't appear to be rewindable by hand. thanks ..... john Subject: Re: Coil winders anyone? > John, what kind of radio? I recently repaired 5 broken connections on an RF coil in a > 1937 RCA. Took some time and patience, but i did it. sometimes all you need is a bit of > solder tinning on a coil form. i fixed one of my breaks that way, it worked! Is it a > multi-tap coil? Russ. ------------------------------ Message-ID: <305863.1186424227885.JavaMail.root@elwamui-rustique.atl.sa.earthlink.net> Date: Mon, 6 Aug 2007 11:17:07 -0700 (GMT-07:00) From: spr@earthlink.net To: Old Tube Radios Subject: Re: Coil winders anyone? Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Hi JOhn, In some radios, the higher melting point wax used to secure the end of the wires where they exit the winding seems to corrode the wire over time, so unwind a turn or two from the outside and see if that helps. Failing that, carefully measure the width and OD of the coil pack (to guide the rewinding) and unwind from the outside, checking for continuity every 10 turns or so. You might get lucky! At any rate, you can count the total turns this way. Given that and the coil pack dimensions, I can calculate the inductance. My shelf full of handbooks is good for at least that! Peace, Scott -----Original Message----- >From: John Gillespie >Sent: Aug 6, 2007 5:53 AM >To: Old Tube Radios >Cc: old tube radios >Subject: Re: Coil winders anyone? > >Hi Russ > Its just one tall thin primary coil on a largish phenolic coil form, >one wire in at the base and one wire out at the outer layer. >Wires out to the terminals are unbroken and resoldering the terminals had no >effect. We have continuity from the terminals to the very last spot on the >wires before they disappear into the coils. This would suggest to me that >there is a break inside the coil itself. The coil has no visible heat or >electrical damage. The coil was totally covered in a very thick coating of >white wax. I hadn't seen before, almost looked like latex, but it melted >off like wax with no smell. > Although a pain, it looks like a relatively easy coil to rewind if I >had access to a coil winder. There are plans on the net for a homemade coil >winder that looks possibly do-able. The only hitch in rewinding this coil >is that it is tall and narrow. Doesn't appear to be rewindable by hand. >thanks ..... john > >Subject: Re: Coil winders anyone? > > >> John, what kind of radio? I recently repaired 5 broken connections on >an RF coil in a >> 1937 RCA. Took some time and patience, but i did it. sometimes all you >need is a bit of >> solder tinning on a coil form. i fixed one of my breaks that way, it >worked! Is it a >> multi-tap coil? Russ. > ------------------------------ Message-ID: <003801c7d864$6021b720$4331bb40@k9a1e1> From: "John Gillespie" To: Old Tube Radios Cc: "old tube radios" Subject: Re: Coil winders anyone? Date: Mon, 6 Aug 2007 16:00:00 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Thanks Scott Thats a good tip about the open being in the outside layers, hadn't thought of that. I'll give it a try in a few days a get back to you. thanks john Subject: Re: Coil winders anyone? > Hi John, > In some radios, the higher melting point wax used to secure the end of the wires where they exit the winding seems to corrode the wire over time, so unwind a turn or two from the outside and see if that helps. ------------------------------ Message-ID: <007a01c7d89e$218cb390$6401a8c0@boudreaux> From: "David Stinson" To: Old Tube Radios Subject: What's Up with 6HS6?? Date: Mon, 6 Aug 2007 21:53:24 -0500 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit I needed to replace a 6HS6 local osc. tube in a Drake R-4A. I looked up the NOS price and it ranged from $16 to $21. I put on in from my R-4B (since I sold the "A" and needed it to be right) and replaced the one in the B with a 6AU6, which seems to work just fine. What the heck is up with the 6HS6?? ------------------------------ Message-ID: <003301c7d8c1$2c756f90$ad00a8c0@Morris1> From: "Morris Odell" To: Old Tube Radios Subject: Re: What's Up with 6HS6?? Date: Tue, 7 Aug 2007 17:04:18 +1000 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Content-Transfer-Encoding: 7bit The 6HS6 is a bit "hotter" than the humble 6AU6 and maybe there was a problem getting a 6AU6 to oscillate properly on all bands - have you checked this? The 6HS6 wouldn't have been in production for anywhere near as long as the 6AU6. There are literally millions of 6AU6s out there but very few 6HS6s in comparison. If they were used in any other desirable equipment (? Collins or somesuch) then that explains the price. 73 de Morris VK3DOC ----- Original Message ----- From: "David Stinson" To: "Old Tube Radios" Sent: Tuesday, August 07, 2007 12:53 PM Subject: What's Up with 6HS6?? >I needed to replace a 6HS6 local osc. tube in a Drake R-4A. > I looked up the NOS price and it ranged from $16 to $21. > I put on in from my R-4B (since I sold the "A" and needed it > to be right) and replaced the one in the B > with a 6AU6, which seems to work just fine. > What the heck is up with the 6HS6?? > ------------------------------ Message-ID: <46B879D9.3070308@mindspring.com> Date: Tue, 07 Aug 2007 09:55:37 -0400 From: Garey Barrell MIME-Version: 1.0 To: Old Tube Radios Subject: Re: What's Up with 6HS6?? Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Dave - The 6HS6 is a fairly limited production tube, coming late in the tube era. It is a "hot" sharp cutoff Pentode. In the Drake receivers, it's used as a mixer, not an oscillator. The 6AU6 is less than half the transconductance of the 6HS6 at the voltages present in the R-4 series, resulting in considerably less mixer gain, and so reduced sensitivity and poorer noise figure. The R-4 has a LOT of gain, and an excellent AVC system that tends to mask these deficiencies unless you are measuring them. Casual listening "sounds" the same, but the ability to dig out a weak one is definitely compromised, especially on the higher bands. (Where there aren't any signals these days anyway!) :-) As for other users, I think Heath used them in the 300 series, and I think they were touted as a "soup-up" in some receivers. Today's prices indicate that this may be one of the first tubes we "run out of" in the Drake world. The 6HR6 is a reasonable sub, but it's even rarer. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B & C-Line Service Supplement CDs David Stinson wrote: > I needed to replace a 6HS6 local osc. tube in a Drake R-4A. > I looked up the NOS price and it ranged from $16 to $21. > I put on in from my R-4B (since I sold the "A" and needed it > to be right) and replaced the one in the B > with a 6AU6, which seems to work just fine. > What the heck is up with the 6HS6?? > > > > ------------------------------ End of BOATANCHORS Digest 4076 ******************************