20070708.ba v04_n067.bam.20070708 >From ???@??? Sun Jul 8 14:19:06 2007 -0500 Date: Sun, 8 Jul 2007 19:18:12 GMT From: Old Tube Radios To: Old Tube Radios Subject: BOATANCHORS digest 4067 Message-Id: <20070708191813.046BB470153@srvr1.theporch.com> BOATANCHORS Digest 4067 Topics covered in this issue include: 1) Re: resistor voltage rating? by Scott Robinson 2) Re: resistor voltage rating? by "Arden Allen" 3) Re: resistor voltage rating? by "Don Davis" 4) Re: resistor voltage rating? by "Arden Allen" 5) resistor voltage rating? by wb3fau@att.net 6) Re: resistor voltage rating? by "Tom Rauch" 7) Scope Carts by wg davis 8) Scope Carts by wgdavis@ipass.net 9) Free Antenna Book download (Radio Antenna Engineering by Laport) by "k4pf@juno.com" 10) Re: resistor voltage rating? by Scott Robinson 11) Re: resistor voltage rating? by "Arden Allen" 12) Re: resistor voltage rating? by john 13) Re: resistor voltage rating? by WA5CAB@cs.com 14) Re: resistor voltage rating? by "Don Davis" 15) Re: resistor voltage rating? by "Arden Allen" 16) Re: resistor voltage rating? by wb3fau@att.net 17) Re: resistor voltage rating? by Scott Robinson 18) Re: resistor voltage rating? by "Tom Rauch" 19) FS: Radiomarine AR-8506B for Restoration with Manual by "Dennis Wade" 20) Anyone interested in full yrs HR magazine? by john 21) Need help reviving TV-7 tube tester by Hans Jense 22) Re: Need help reviving TV-7 tube tester by Garey Barrell 23) Isolation transformer demand? by Gary Gitzen ---------------------------------------------------------------------- Mime-Version: 1.0 Message-Id: Date: Wed, 4 Jul 2007 13:06:26 -0700 To: Old Tube Radios From: Scott Robinson Subject: Re: resistor voltage rating? Content-Type: text/plain; charset="us-ascii" ; format="flowed" Russ, Look in a catalog (Mouser, Digi-Key, for instance) and read the specs. /scott /scott >Opening up an old can of worms-[sorry guys]. I have never >seen a voltage rating for >carbon composition resistors. Perhaps it applies to film >resistors? I have only seen >wattage ratings. So, i would be voltage limited by how much >current i was trying to pass thru that resistor? As in P= EI? >Is there a hi voltage limit to carbon resisitors >as to where they will "flash over"? Russ. ------------------------------ Message-ID: <002f01c7be7a$0c03c650$e9a0480c@KB6NAX> From: "Arden Allen" To: Old Tube Radios Subject: Re: resistor voltage rating? Date: Wed, 4 Jul 2007 13:29:06 -0700 MIME-Version: 1.0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: 7bit John's spec sheet is a good example of a resistor spec sheet. Carbon comp resistors have always had voltage ratings but you don't always find the voltage ratings in catalogs. You can see that the manufacturer's spec sheet has much more information. Voltage ratings are established for a variety of reasons, one being conformance to Mil specs, others based on life and reliability testing, usually at stress levels established for those designers who leave slim overload margins, etc. Arden Allen KB6NAX ----- Original Message ----- From: To: "Old Tube Radios" Sent: Wednesday, July 04, 2007 10:45 AM Subject: resistor voltage rating? > Opening up an old can of worms-[sorry guys]. I have never seen a voltage rating for > carbon composition resistors. Perhaps it applies to film resistors? I have only seen > wattage ratings. So, i would be voltage limited by how much current i was trying to pass thru that resistor? As in P= EI? Is there a hi voltage limit to carbon resisitors > as to where they will "flash over"? Russ. > ------------------------------ Message-ID: <003f01c7be82$37063c90$2101a8c0@hppav> From: "Don Davis" To: Old Tube Radios Subject: Re: resistor voltage rating? Date: Wed, 4 Jul 2007 14:27:55 -0700 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit Per MIL-R-39008C, which is RCRxx style, the max applied voltage is limited to the max power of the device (temp < 70 deg C), but also limited as follows across the terminals (dc or rms): .125W 150v .250 250v .500 350v 1.0 500v 2.0 500v Additionally, the dielectric withstanding voltage test requires the device, with both leads tied together and voltage applied between the leads and the outside of the part, to survive 5 seconds at 2 times the above voltages, rms 60Hz ac. Forget the catalogs - always head for a MIL spec.... 73 de Don AD6PB ----- Original Message ----- From: To: "Old Tube Radios" Sent: Wednesday, July 04, 2007 10:45 AM Subject: resistor voltage rating? > Opening up an old can of worms-[sorry guys]. I have never seen a > voltage rating for > carbon composition resistors. Perhaps it applies to film resistors? > I have only seen > wattage ratings. So, i would be voltage limited by how much current i > was trying to pass thru that resistor? As in P= EI? Is there a hi > voltage limit to carbon resisitors > as to where they will "flash over"? Russ. > > ------------------------------ Message-ID: <001901c7bf0d$d478b8f0$2a9f480c@KB6NAX> From: "Arden Allen" To: Old Tube Radios Subject: Re: resistor voltage rating? Date: Thu, 5 Jul 2007 06:54:34 -0700 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit > Forget the catalogs - always head for a MIL spec.... That's just dandy if you want to pay the premium prices for Mil-spec parts or don't like modern commercial grade parts that have higher ratings. Don't assume Mil-spec ratings apply to similar commercial grade parts. The history of carbon comp resistors is as bad as today's Chinese food purity issues! Arden Allen KB6NAX ------------------------------ From: wb3fau@att.net To: Old Tube Radios Subject: resistor voltage rating? Date: Thu, 05 Jul 2007 14:57:38 +0000 Message-Id: <070520071457.1404.468D06E1000DBBD20000057C21603831169A0E00CC0D99@att.net> OK very good info guys thanks. I have never had to determine this criteria. If i replaced a resistor I put back the same wattage, unless i knew it was getting hot. I guess it really never came into play. Russ. ------------------------------ Message-ID: <006801c7bf15$e01d6630$640fa8c0@radioroom> From: "Tom Rauch" To: Old Tube Radios Subject: Re: resistor voltage rating? Date: Thu, 5 Jul 2007 11:04:59 -0400 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit > OK very good info guys thanks. I have never had to > determine this criteria. If i replaced a resistor I > put back the same wattage, unless i knew it was > getting hot. > I guess it really never came into play. Russ. It comes into play a lot Russ, people just don't realize it does. One example (besides the diodes) is meter multipliers. Say you have a 1000 volt HV meter with a movement of 1mA and decide to use a few resistors. Total dissipation in the divider would be 1 watt or less, and someone might decide a pair of one watt resistors or single two watt resistor might work, but it probably is over the safe voltage limit. 73 Tom ------------------------------ Message-Id: <6.2.3.4.2.20070705215429.0363dc90@mail.ipass.net> Date: Thu, 05 Jul 2007 21:58:33 -0400 To: Old Tube Radios From: wg davis Subject: Scope Carts Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="=====================_172122234==.ALT" --=====================_172122234==.ALT Content-Type: text/plain; charset="us-ascii"; format=flowed Hi Guys, I have come across a couple of Tektronics Scope Carts and was wondering what they are worth?? Model K212 and Model Type 200C.. C U Later, 73 WG WG Davis / K4WGD wgdavis@ipass.net Johnston Co., N.C. --=====================_172122234==.ALT 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 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * --=====================_172122234==.ALT-- ------------------------------ Message-ID: <1183688681.468da7e9a7cde@www.portbridge.com> Date: Thu, 5 Jul 2007 22:24:41 -0400 From: wgdavis@ipass.net To: Old Tube Radios Subject: Scope Carts MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="-MOQ11836886812256e28cf98e3d00d3cd7c841787f8e0" This message is in MIME format. ---MOQ11836886812256e28cf98e3d00d3cd7c841787f8e0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Hi Guys, I have come across a couple of Tektronics Scope Carts and was wondering what they are worth?? Model K212 and Model Type 200C.. C U Later, 73 WG WG Davis / K4WGD wgdavis@ipass.net Johnston Co., N.C. ----- End forwarded message ----- ---MOQ11836886812256e28cf98e3d00d3cd7c841787f8e0 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 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ---MOQ11836886812256e28cf98e3d00d3cd7c841787f8e0-- ------------------------------ Mime-Version: 1.0 From: "k4pf@juno.com" Date: Fri, 6 Jul 2007 19:42:59 GMT To: Old Tube Radios Subject: Free Antenna Book download (Radio Antenna Engineering by Laport) Message-Id: <20070706.154259.22698.0@webmail27.lax.untd.com> Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Content-Type: text/plain Hi, Gang This 1952 antenna text, which is a rare and classic McGraw-Hill textbook, is available for free download: http://www.lulu.com/browse/book_view.php?fCID=3D159004&fBuyItem=3D5 I bought the optional softcover print-out, = and can recommend its quality. The text has especially good coverage of wire antennas, including Rhombi= cs. = The author had a long career at RCA doing antenna design LF thru HF, including overseeing many installations. His book is very "practical", with plenty of design notes. Many of the photos are fascinating, including the KPH transmitter room, and an MF antenna doghouse. 73, Ed Knobloch ------------------------------ Mime-Version: 1.0 Message-Id: Date: Fri, 6 Jul 2007 13:14:40 -0700 To: Old Tube Radios From: Scott Robinson Subject: Re: resistor voltage rating? Content-Type: text/plain; charset="us-ascii" ; format="flowed" Folks, We are losing sight of the objective. Carbon comp resistors are irrelevant to new construction, such as making diode arrays to replace hollow state rectifiers, since I don't think you can much get them now. What you *can* get are 5% carbon film and 1% or better metal film resistors, so their voltage ratings (yep, 250V DC for a 1.4 w size, 350 VDC for 1/2 W) are the relevant matter here. Regards, Scott At 6:54 AM -0700 7/5/07, Arden Allen wrote: > > Forget the catalogs - always head for a MIL spec.... > >That's just dandy if you want to pay the premium prices for Mil-spec parts >or don't like modern commercial grade parts that have higher ratings. Don't >assume Mil-spec ratings apply to similar commercial grade parts. The >history of carbon comp resistors is as bad as today's Chinese food purity >issues! > >Arden Allen >KB6NAX ------------------------------ Message-ID: <002b01c7c012$0c958ba0$d89f480c@KB6NAX> From: "Arden Allen" To: Old Tube Radios Subject: Re: resistor voltage rating? Date: Fri, 6 Jul 2007 14:10:06 -0700 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit > We are losing sight of the objective. Carbon comp resistors are > irrelevant to new construction, such as making diode arrays to > replace hollow state rectifiers, since I don't think you can much get > them now. Heh, heh, Scott. The audiophooles have had an affect on supply. You can still buy them aplenty. Probably junk, though. Arden Allen KB6NAX ------------------------------ Message-Id: <6.2.1.2.2.20070706171825.02f43340@pop-server.nc.rr.com> Date: Fri, 06 Jul 2007 17:19:29 -0400 To: Old Tube Radios From: john Subject: Re: resistor voltage rating? Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Actually they're still made new, just not in 2W range anymore (and I believe no 1W either). Films of any sort cannot match their surge performance, but the metal oxide compositions can. John K5MO At 04:14 PM 7/6/2007, Scott Robinson wrote: >Folks, > >We are losing sight of the objective. Carbon comp resistors are irrelevant >to new construction, such as making diode arrays to replace hollow state >rectifiers, since I don't think you can much get them now. What you *can* >get are 5% carbon film and 1% or better metal film resistors, so their >voltage ratings (yep, 250V DC for a 1.4 w size, 350 VDC for 1/2 W) are the >relevant matter here. > >Regards, > >Scott > > >At 6:54 AM -0700 7/5/07, Arden Allen wrote: >> > Forget the catalogs - always head for a MIL spec.... >> >>That's just dandy if you want to pay the premium prices for Mil-spec parts >>or don't like modern commercial grade parts that have higher ratings. Don't >>assume Mil-spec ratings apply to similar commercial grade parts. The >>history of carbon comp resistors is as bad as today's Chinese food purity >>issues! >> >>Arden Allen >>KB6NAX ------------------------------ From: WA5CAB@cs.com Message-ID: Date: Fri, 6 Jul 2007 17:20:22 EDT Subject: Re: resistor voltage rating? To: Old Tube Radios MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_cff.11a6d4fc.33c00c16_boundary" --part1_cff.11a6d4fc.33c00c16_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Arden, No, you can still buy new 1/2W and 1W in reasonable quantities (meaning you don't have to buy 1000 of each value) from Newark. Made by Ohmite, if I recall correctly the 1W are available only in 10% and the 1/2W in both 5% and 10%. I think they also still make 1/4W but as none were ever used in the gear I play with, I haven't bought any. They quit making 2W, though. What they offer as a sub looks more like the originals than anyone elses but it's still slightly smaller, has domed ends, and is the wrong body. The only problem with them is that as on the other types of resistors and the capacitors the wire gauge is lighter and the wire is shorter by about 1/3. In a message dated 7/6/2007 4:11:36 PM Central Daylight Time, gumbear@pacbell.net writes: > >We are losing sight of the objective. Carbon comp resistors are > >irrelevant to new construction, such as making diode arrays to > >replace hollow state rectifiers, since I don't think you can much get > >them now. > > Heh, heh, Scott. The audiophooles have had an affect on supply. You can > still buy them aplenty. Probably junk, though. Robert Downs - Houston (Web Store) MVPA 9480 (Primary email) (Backup email) --part1_cff.11a6d4fc.33c00c16_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_cff.11a6d4fc.33c00c16_boundary-- ------------------------------ Message-ID: <00b401c7c049$cf409410$2101a8c0@hppav> From: "Don Davis" To: Old Tube Radios Subject: Re: resistor voltage rating? Date: Fri, 6 Jul 2007 20:49:11 -0700 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit But then, MIL Spec parts (passives, at any rate) are exactly same as commercial products. Just tested / screened more. And, MIL specs usually give much more insight into derating and other environmental effects. Almost like Ap Notes if you know where to look and have access to GIDEPs and other sources. 73 de AD6PB ----- Original Message ----- From: "Arden Allen" To: "Don Davis" ; "Old Tube Radios" Sent: Thursday, July 05, 2007 6:54 AM Subject: Re: resistor voltage rating? >> Forget the catalogs - always head for a MIL spec.... > > That's just dandy if you want to pay the premium prices for Mil-spec parts > or don't like modern commercial grade parts that have higher ratings. > Don't > assume Mil-spec ratings apply to similar commercial grade parts. The > history of carbon comp resistors is as bad as today's Chinese food purity > issues! > > Arden Allen > KB6NAX > > ------------------------------ Message-ID: <002101c7c05c$5c5d4890$339e480c@KB6NAX> From: "Arden Allen" To: Old Tube Radios Subject: Re: resistor voltage rating? Date: Fri, 6 Jul 2007 23:01:40 -0700 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit > But then, MIL Spec parts (passives, at any rate) are exactly same as > commercial products. Just tested / screened more. I can't quite agree, Don. It's the other way around. SOME commercial parts are lesser processed Mil-spec grade parts. Many won't make military muster no matter how much you test them. Mil-spec parts have been specified to handle the environmental and load life requirements suitable for military applications. Such envrionments as the blistering heat and recoil of a tank blasting the hell out of our brother Muslims in the blistering heat of Iraq. And so on.... Some of the US carbon comp resistors made for consumer electronics we know don't even have a decent shelf life let alone survive being used within spec. Allen Bradley made the best the military could buy. But it took them a lot of hard work I imagine to develop really good carbon comp resistors. If you stop to think a carbon comp resistor element is essentially a mix of carbon and clay. Any fool wanting to make a buck could make such a stew in his basement. Not Mil-spec though! :-) Arden Allen KB6NAX ------------------------------ From: wb3fau@att.net To: Old Tube Radios Cc: Scott Robinson Subject: Re: resistor voltage rating? Date: Sat, 07 Jul 2007 15:55:18 +0000 Message-Id: <070720071555.9672.468FB766000BDE59000025C821603760219A0E00CC0D99@att.net> Well Scott-[not meant to be argumentive] I have 1000s of carbon comp. resistors. I am sure many of us do. OK on the info. You can still buy them. Russ. ------------------------------ Mime-Version: 1.0 Message-Id: Date: Sat, 7 Jul 2007 13:54:21 -0700 To: Old Tube Radios From: Scott Robinson Subject: Re: resistor voltage rating? Cc: Scott Robinson Content-Type: text/plain; charset="us-ascii" ; format="flowed" At 3:55 PM +0000 7/7/07, wb3fau@att.net wrote: >Well Scott-[not meant to be argumentive] I have 1000s of carbon >comp. resistors. I am sure many of us do. OK on the info. You >can still buy them. Russ. Hi RUs, I have some , too, but as most of them are at least 20% high and many are worse, I never use one without first measuring it. Regards, Scott ------------------------------ Message-ID: <01c601c7c0da$bc875de0$640fa8c0@radioroom> From: "Tom Rauch" To: Old Tube Radios Cc: "Scott Robinson" Subject: Re: resistor voltage rating? Date: Sat, 7 Jul 2007 17:06:40 -0400 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit > Well Scott-[not meant to be argumentive] I have 1000s > of carbon comp. resistors. I am sure many of us do. OK > on the info. You can still buy them. We had a heck of a time buying carbon comps in the 1-2 watt range commercially even ten years ago. So much so we totally abandoned carbon compositions for any application around 2000. Even in the 80's it was starting to be a problem!! Eventually Allen Bradley became the sole source. You have to be darned careful because many resistors that look exactly like carbon comps are carbon films. There is **no way** to externally tell the difference. We had to always cut a sample resistor open when changing vendors unless the part was guaranteed to be composition by the manufacturer. See the resistor photos near the page bottom: http://www.w8ji.com/beverages.htm As you can see, the 470 ohm carbon comp and 470 ohm carbon film are identical outside. 73 Tom ------------------------------ Message-ID: Date: Sat, 7 Jul 2007 16:18:38 -0700 From: "Dennis Wade" To: Old Tube Radios Subject: FS: Radiomarine AR-8506B for Restoration with Manual MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline Good Afternoon, I am putting up for sale my Radiomarine AR-8506-B receiver. It covers 85 kc to 550 kc and 1.9 mc to 25 mc in 5 bands. Its a 10 tube superhet designed for shipboard service. It has a tag on it that says "Standard Arizona" and "removed 3-22-68". It does not have the shock mounts or cabinet...it apparently came out of a rack. Manual is a photocopy of average quality (readable), with schematics and alignment instructions. I've applied power to it and I hear some hissing, but no signals. It shows its age with some corrosion on the chassis, but I believe it will restore with some work. I simply don't have the time to devote to it, and I want someone with the time and interest to take the job on. Price: $175. Buyer to pay for foam-in-place packing and double boxing on about 65 lbs (unpacked). Shipping would probably be by FedEx ground from 95608. I can supply photos to serious prospects only, please. Send me a note if you would like pics. Thanks for looking. Dennis -- Dennis L. Wade KG6ZI Carmichael, CA ------------------------------ Message-Id: <6.2.1.2.2.20070708134533.02f53140@pop-server.nc.rr.com> Date: Sun, 08 Jul 2007 13:47:24 -0400 To: Old Tube Radios From: john Subject: Anyone interested in full yrs HR magazine? Cc: boatanchors@theporch.com Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Anyone interersted in full years (decades? ) of HR magazine, plz write. Need to sell off duplicates (have many, including early) to make room for more stuff! Thanks John K5MO ------------------------------ Mime-Version: 1.0 (Apple Message framework v624) Content-Transfer-Encoding: 7bit Message-Id: <9c69c84e87fbe8fee5a1209e9a78496e@planet.nl> Content-Type: text/plain; charset=US-ASCII; format=flowed To: Old Tube Radios From: Hans Jense Subject: Need help reviving TV-7 tube tester Date: Sun, 8 Jul 2007 20:31:26 +0200 A number of years ago I acquired a TV-7A/U tube tester but never got round to actually using it. I guess the time has now come and I've started to go through the manuals and the test set itself. It appears to be missing one part: the fuse on the front panel next to the Line Adjust control. From the manuals I gather it's a lamp (neon lamp?), but I can't find a specification for it. Can anyone tell me what kind of fuse/lamp it is and where I can find a suitable replacement? Also: the handle is gone. Any suggestions for a substitute are welcome. Hans Jense, PE9HLA ------------------------------ Message-ID: <46913012.6000506@mindspring.com> Date: Sun, 08 Jul 2007 14:42:26 -0400 From: Garey Barrell MIME-Version: 1.0 To: Old Tube Radios Subject: Re: Need help reviving TV-7 tube tester Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Hans - It's a type 81 incandescent bulb. Used in some American autos in the 50's. Available from most of the bulb suppliers. The SHORTS indicator is an NE-45 neon bulb, available from the same suppliers. Shop several places, the prices vary WILDLY.!! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B & C-Line Service Supplement CDs Hans Jense wrote: > A number of years ago I acquired a TV-7A/U tube tester but never got > round to actually using it. I guess the time has now come and I've > started to go through the manuals and the test set itself. It appears > to be missing one part: the fuse on the front panel next to the Line > Adjust control. From the manuals I gather it's a lamp (neon lamp?), > but I can't find a specification for it. Can anyone tell me what kind > of fuse/lamp it is and where I can find a suitable replacement? > > Also: the handle is gone. Any suggestions for a substitute are welcome. > > Hans Jense, PE9HLA > > ------------------------------ From: Gary Gitzen Message-Id: <200707081917.MAA12477@mail.uwave.com> Subject: Isolation transformer demand? To: Old Tube Radios Date: Sun, 08 Jul 2007 12:17:07 PDT Hi Boatanchorites, If you don't care about isolation transformers, punt now. If you might want a 600VA 115/230 > 115 xfmr, read on. I recently found a lot of ten 100/115/200/230V to 115V Signal Transformer isolation transformers available. They are rated at 600VA, and are NIB. They have insulated screw terminals for connections. I sent mail to the R390 list about them, and have seen some demand for them, but neglected to include the Boatanchors list. I suspect some folks here on Boatanchors might want some. These are up for auction locally. If there is sufficient demand, I'll attempt to purchase them. The final cost would probably be $20 each. Shipping for 1-2 in a flat rate box would probably be about $9.15 with the new postage rates. This mail is purely to see what current demand for such transformers might be, and is _not_ currently an offer to sell such transformers, because I don't have them. Caveat: if enough people express interest, I will attempt to obtain these units, and consider your positive response a provisional order. If you are interested in 1-2 (or however many may fit in a flat rate box, possibly up to four), please let me know by 9PM Sunday evening, PDT (tonight!). Apologies for the short notice, due entirely to my failure to include Boatanchors in that earlier mail. Regards, Gary Gitzen San Jose, CA ------------------------------ End of BOATANCHORS Digest 4067 ******************************