20070610.ba v04_n059.bam.20070610 >From ???@??? Sun Jun 10 14:56:10 2007 -0500 Date: Sun, 10 Jun 2007 19:55:19 GMT From: Old Tube Radios To: Old Tube Radios Subject: BOATANCHORS digest 4059 Message-Id: <20070610195523.DE16947011E@srvr1.theporch.com> BOATANCHORS Digest 4059 Topics covered in this issue include: 1) Re: Lower B+ in BA Transmitters, Now by john 2) SCR-808 & SCR-828-A by Hole in the Head Press 3) Callsign search by "Comarow, Avery" 4) Re: SCR-808 & SCR-828-A by "Marty Reynolds' debris field" 5) Looking for 2 Hallicrafters logo knobs by 6) Re: Looking for 2 Hallicrafters logo knobs by wb3fau@att.net 7) Drake TR-M Manual Needed by Jim Allen 8) Boonton 260 Q-meters by "Roger Dillon" 9) August '46 QST by "Art Lebermann" 10) Antenna ID ? by Jerry Proc 11) Antenna ID? - Typo by Jerry Proc 12) ACP-113 by Jerry Proc 13) For Sale: Hallicrafters SX-71 Parts, Test Equipment, Antique Radios and Misc. by David Hollander 14) Sensitivity, bandwidth and audio fidelity measurement on AM broadcast radios manufactured in 1928 and 1929 by "eug4not" 15) damaged ferrite slugs by wb3fau@att.net 16) Re: damaged ferrite slugs by "Tom Rauch" 17) Re: damaged ferrite slugs by "Arden Allen" 18) Question re: Butternut HF6V vertical antenna by "Soundval" 19) Re: damaged ferrite slugs by "John Gillespie" 20) Re: damaged ferrite slugs by Steve Berg 21) Re: damaged ferrite slugs by john 22) Re: damaged ferrite slugs by Richard Post 23) Re: damaged ferrite slugs by Buzz ---------------------------------------------------------------------- Message-Id: <6.2.1.2.2.20070604193043.03059cd0@pop-server.nc.rr.com> Date: Mon, 04 Jun 2007 19:31:06 -0400 To: Old Tube Radios From: john Subject: Re: Lower B+ in BA Transmitters, Now Cc: Old Tube Radios Mime-Version: 1.0 Content-Type: text/plain; charset=3D"us-ascii"; format=3Dflowed At 08:57 AM 6/4/2007, Marty Reynolds' debris field wrote: >same syndrome here as evidenced by my growing collection of no-scan TVs Sounds like the *perfect* TV..... John K5MO ------------------------------ Message-ID: <4664B3A3.6070400@sonic.net> Date: Mon, 04 Jun 2007 17:51:47 -0700 From: Hole in the Head Press MIME-Version: 1.0 To: Old Tube Radios Subject: SCR-808 & SCR-828-A Content-Type: text/plain; charset=3DISO-8859-1; format=3Dflowed Content-Transfer-Encoding: 7bit The SCR-808-A and SCR-828-A are listed as being used by mobile Coast Artillery units. We are in the process of setting up a display in Battery Townsley, a 16-inch gun battery just across the Golden Gate Bridge in the GGNRA and would like to understand more about the radios used in the Harbor Defenses of San Francisco. Does anybody have information on what the differences are between the SCR-808, SCR-828 and the SCR-808-A and SCR-828-A? I have TM 11-601 dated June 1945, but don't see any information concerning the difference between models. Thanks, --=20 Sam Stokes, Publisher, KG6WYZ Second Edition Rings of Supersonic Steel Air Defenses of the US Army 1950-1974 An Introductory History & Site Guide http://www.holeintheheadpress.com ------------------------------ Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary=3D"----_=3D_NextPart_001_01C7A830.92EBC15A" Subject: Callsign search Date: Wed, 6 Jun 2007 07:48:18 -0400 Message-ID: <5DB55C95EDBFFA4383CE672594D7E0D20422B2EC@EXCHANGE.usn.root.ent> From: "Comarow, Avery" To: Old Tube Radios Cc: , This is a multi-part message in MIME format. ------_=3D_NextPart_001_01C7A830.92EBC15A Content-Type: text/plain; charset=3D"us-ascii" Content-Transfer-Encoding: quoted-printable In high school I hung out with a guy who got his ticket around the time I did, 1960 or '61. I'm seeing him tonight after a lapse of 45 years and would love to be able to cite his call. (Mine at the time was K3NKD.) Can somebody dig up the call for Russell Wald in Silver Spring, Maryland, from that far-off time? Thanks in advance. 73, Avery W3AVE Potomac, Md. ------_=3D_NextPart_001_01C7A830.92EBC15A Content-Type: text/plain; charset=3Dus-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 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ------_=3D_NextPart_001_01C7A830.92EBC15A-- ------------------------------ Message-ID: <50423.216.49.173.107.1181132018.squirrel@fracas.netboobie.org> Date: Wed, 6 Jun 2007 08:13:38 -0400 (EDT) Subject: Re: SCR-808 & SCR-828-A From: "Marty Reynolds' debris field" To: Old Tube Radios Cc: boatanchors@theporch.com MIME-Version: 1.0 Content-Type: text/plain;charset=3Diso-8859-1 Content-Transfer-Encoding: 8bit Yo Sam u inquired about those sets beginning.... > The SCR-808-A and SCR-828-A are listed as being used by mobile Coast > Artillery units. > There's a web site with 'em featured http://209.165.152.119/radios/ There's this huge, neat, & mostly right compendium by nj7p at http://hereford.ampr.org/millist/m23.html To summarize, the 808 had 2 rxs (bc-923s) & the 828 had 1. Can't resolve difference on A suffix These FM jobbies were built by Zenith and were launched by the xtal shortage worry early in ww2 - something probably overcome b4 sets ever hit prod'n. They're a "VFO'd" SCR 608/628 Ask what time it is & u learn to build a watch Marty ------------------------------ Message-ID:= <56357.65.218.135.67.1181141804.squirrel@samson.email.starband.net> Date: Wed, 6 Jun 2007 10:56:44 -0400 (EDT) Subject: Looking for 2 Hallicrafters logo knobs From: To: Old Tube Radios MIME-Version: 1.0 Content-Type: text/plain; charset=3Diso-8859-1 Content-Transfer-Encoding: 8bit Folks, I'm in the process of restoring a WW2 vintage BC-669 transceiver, manufactured by Hallicrafters. It's missing 2 knobs (receiver function and transmitter channel)which are both the same style. The knobs are the standard old Hallicrafters knobs, the ones with the raised "h" in a round area in the middle of the bar knob over a skirt, about 1 1/2" in diameter (I guesstimate, as the knobs have disintegrated into little fragments). If anyone has any such knobs, please let me know. Thanks, 73, Meir WF2U Landrum, SC ------------------------------ From: wb3fau@att.net To: Old Tube Radios Cc: Subject: Re: Looking for 2 Hallicrafters logo knobs Date: Wed, 06 Jun 2007 17:13:07 +0000 Message-Id:=20 <060620071713.5511.4666EB230002BC780000158721603762239A0E00CC0D99@att.net> try Fair Radio Sales- Lima Ohio. I think they had BC669s=20 some years back, likely to have parts. ------------------------------ Date: Wed, 6 Jun 2007 14:03:23 -0700 (PDT) From: Jim Allen Subject: Drake TR-M Manual Needed To: Old Tube Radios MIME-Version: 1.0 Content-Type: multipart/alternative;= boundary=3D"0-1040587802-1181163803=3D:8947" Message-ID: <859927.8947.qm@web82608.mail.mud.yahoo.com> --0-1040587802-1181163803=3D:8947 Content-Type: text/plain; charset=3Dascii Hello All, I'm in need of a service/operators manual (or copy) for a Drake=20 TR-M tranceiver. Help! Regards, Jim NU6AM --0-1040587802-1181163803=3D:8947 Content-Type: text/plain; charset=3Dus-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 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * --0-1040587802-1181163803=3D:8947-- ------------------------------ Message-ID: <7B170329521844A4B8F5768ECAA4DEA1@rogerPC> From: "Roger Dillon" To: Old Tube Radios Subject: Boonton 260 Q-meters Date: Wed, 6 Jun 2007 20:07:39 -0500 MIME-Version: 1.0 Content-Type: text/plain; format=3Dflowed; charset=3D"iso-8859-1"; reply-type=3Doriginal Content-Transfer-Encoding: 7bit About four years ago, I came across a pile of these Q-meters in a warehouse in Garland, Texas. I was unable to reach a reasonable (cheap) price with the warehouse operator, so they stayed there. Earlier this year he lost his lease, and had to move. Had something of a fire sale. Now the six units are in my shop, in the way. I will bring them to Hamcom on Friday. Anyone who wants one can give me $30 and take his pick; first come, first choice. There were no condenser or inductance standards that I could find. Most of them look nice, with one sorry specimen in the bunch. I don't know if they work, and don't have time fo find out. I will be in the tailgate area, Grey Silverado. I will also be working registration both days, most of the time. If you really, really want one, but can't make Friday, let me know and we can work something out. If you are flying in, have a bad back, or a heart condition, you really should get something lighter. If you are not interested in this rare and historical piece of test equipment, stop by and say hi anyway. Hope to see some of you there. 73 Roger N5PGH ------------------------------ Message-ID: <380-220076586405887@earthlink.net> From: "Art Lebermann" To: Old Tube Radios Subject: August '46 QST Date: Thu, 7 Jun 2007 23:40:58 -0700 MIME-Version: 1.0 Content-type: text/plain; charset=3DUS-ASCII Does anyone have a copy of the August 1946 issue of QST? I'd like to purchase a copy - or have one page scanned. Thanks! Art Lebermann W6REQ ------------------------------ Date: Sat, 9 Jun 2007 11:14:39 -0400 (EDT) From: Jerry Proc Subject: Antenna ID ? To: Old Tube Radios MIME-Version: 1.0 Content-Type: text/plain; charset=3Diso-8859-1 Content-Transfer-Encoding: 8bit Message-ID: <391936.89562.qm@web90606.mail.mud.yahoo.com> Hello Everyone, I'm trying to identify an antenna at one of Canada's former SIGINT stations - Whitehorse, Yukon. It appears this antenna uses spreaders shaped like the Star of David. If that's the case, it would permit the spacing of 5 antenna wires in a circular pattern. http://jproc.ca/test/suprad_whitehorse.jpg What type of antenna might that be in the photo? -- Regards, Jerry Proc E-mail: jerry7proc@yahoo.com Be smarter than spam. See how smart SpamGuard is at giving junk=20 email the boot with the All-new Yahoo! Mail at=20 http://mrd.mail.yahoo.com/try_beta?.intl=3Dca ------------------------------ Date: Sat, 9 Jun 2007 11:25:38 -0400 (EDT) From: Jerry Proc Subject: Antenna ID? - Typo To: Old Tube Radios MIME-Version: 1.0 Content-Type: text/plain; charset=3Diso-8859-1 Content-Transfer-Encoding: 8bit Message-ID: <504021.93530.qm@web90606.mail.mud.yahoo.com> Hello Everyone, My last e-mail had a typo . It should have said 6 wires, not 5. -- Regards, Jerry Proc E-mail: jerry7proc@yahoo.com Be smarter than spam. See how smart SpamGuard is at giving junk=20 email the boot with the All-new Yahoo! Mail at=20 http://mrd.mail.yahoo.com/try_beta?.intl=3Dca ------------------------------ Date: Sat, 9 Jun 2007 11:31:35 -0400 (EDT) From: Jerry Proc Subject: ACP-113 To: Old Tube Radios MIME-Version: 1.0 Content-Type: text/plain; charset=3Diso-8859-1 Content-Transfer-Encoding: 8bit Message-ID: <791170.11454.qm@web90609.mail.mud.yahoo.com> Hello Everyone, I have posted ACP-113, the 2003 listing of call signs for military ships. If anyone is interested, just download the PDF File from: http://www.jproc.ca/test/ACP113AE_Call_sign_Book_For_Ships.pdf -- Regards, Jerry Proc E-mail: jerry7proc@yahoo.com __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ------------------------------ Message-ID: <466AE740.7000309@cox.net> Date: Sat, 09 Jun 2007 10:45:36 -0700 From: David Hollander MIME-Version: 1.0 To: Old Tube Radios Subject: For Sale: Hallicrafters SX-71 Parts, Test Equipment, Antique Radios and Misc. Content-Type: text/plain; charset=3DISO-8859-1; format=3Dflowed Content-Transfer-Encoding: 8bit Here are some items for sale. Prices do not include shipping. I will ship overseas. Parting out Hallicrafters SX-71 Receiver...power transformer, some knobs, complete chassis and more. Marconi Universal Impedance Bridge TF 868........$100 plus shipping This bridge will measure the following ranges: L - 1=B5H to 100 Henrys, C - 1 pF to 100 =B5F, R - 0.1 Ohms to 100 Megohms. The unit does work. Includes a photocopy of the manual. http://members.cox.net/radiostuff9/marconi_bridge.JPG http://members.cox.net/radiostuff9/marconi_bridge2.JPG Marconi AM/FM Signal Generator Model TF 995A.........$120 plus shipping Covers from 1.5 to 220 Mc/s in five bands. Its open circuit output level is variable in 1 db steps, from a minimum of 0.1 micro volts to a maximum of 100 mV at 52 ohms and 200 mV at 75 ohms. The output may be CW,, frequency modulated, amplitude modulated, or simultaneously both frequency and. amplitude modulated.The unit works. I was able to hear the signal at various frequencies on a a general coverage receiver. It may need calibration. The power cord and test lead are tucked into the side of the unit. No manual. Heavy unit/ http://members.cox.net/radiostuff9/marconi_siggen.JPG Radio Craftsmen Model 10 AM-FM Tuner with Manual......$90 plus shipping This is a 12 tube chrome chassis mono unit from around 1950. This unit works very well. I hooked it up to a dual 6V6 mono amp and a 15 inch speaker and let it play while I was working in my shop. It sounds very good on both the am and fm broadcast that I listened to and all controls do what they are supposed to do. If you like playing with vintage mono units, this unit would be a nice unit to play with. Includes an 8 page Rider's manual http://members.cox.net/radiodx5/craftsman_tuner.JPG http://members.cox.net/radiodx5/craftsman_tuner2.JPG Dumont Type 346 AC Compact Voltmeter.........$23 plus shipping This is a compact unit that will measure ac voltage from 0.001 volts to 300 volts in 12 ranges. This is a compact unit measuring 4 inches wide by 6 inches high by 7 inches deep. This is a tested working unit in excellent condition. The input jacks fit standard banana type plus. http://members.cox.net/radiostuff9/dumont_acvoltmeter.JPG Philco 42-327 BC/SW Radio...........$30 plus shipping Project radio. Appears complete (except power cord) http://members.cox.net/radiodx3/philco_42_327.JPG http://members.cox.net/radiodx3/philco_42_3272.JPG http://members.cox.net/radiodx3/philco_42_3273.JPG 12 Tube 1930's "Unknown Brand" Radio...............$40 plus shipping 1930's radio of unknown origin. This radio has a high tube count however a number of the tubes are just ballast tubes. The extra tubes were added to the radio to impress the public with the high tube count. This radio covers the AM broadcast band and one short wave band covering 2.2 to 7 MC. The radio is restorable. The wooden case is in reasonably good condition with some veneer missing on the bottom left. The radio is missing several tubes and the knobs. Reproduction plastic dial covers are available from a number of sources. http://members.cox.net/radiostuff9/30s_radio.JPG http://members.cox.net/radiostuff9/30s_radio3.JPG http://members.cox.net/radiostuff9/30s_radio4.JPG Large National Radio Ceramic Coil Forms.........$14 plus shipping These are 2.5 inches in diameter. http://members.cox.net/radiodx3/ceramic_coilsx2.JPG Ceramic Antenna Feedthrough Insulators - 4......$14 plus shipping These are 1.75 inches in diameter and 2.25 inches long excluding the screws. Use these to bring your open wire feed line into your shack. http://members.cox.net/radiodx3/feedthroughs.JPG 3 Fixed High Voltage Vacuum Capacitors........$20 plus shipping These caps are rated at 7.5 kilovolts and measures 50 pf http://members.cox.net/radiodx3/hv_vaccapx3.JPG 73 and thanks for looking. *********************************************************** Dave N7RK Boatanchors Home Page: http://members.cox.net/n7rk Phoenix, Arizona *DXCC Honor Roll* *WAZ#22 - 75 Meter SSB* ex-XE2/N7RK, N7RK/ZB2, VK2ERK, ZM0AJN, WB6NRK, WN6IWX Boatanchor and Antique Radio Collector ------------------------------ Date: Sat, 09 Jun 2007 16:27:26 -0400 From: "eug4not" Subject: Sensitivity, bandwidth and audio fidelity measurement on AM= broadcast radios manufactured in 1928 and 1929 To: Old Tube Radios Message-id: <466AD4EE.30608.21CDBB7@eug4not.bentongue.com> MIME-version: 1.0 Content-type: text/plain; charset=3DUS-ASCII Content-transfer-encoding: 7BIT Content-description: Mail message body Hi folks, A new section has been added to my Site covering measurements made by Radio Frequency Labs and, most likely, RCA and Westinghouse, on radios=20 manufactured in 1928 and 1929. The data can be viewed in Section 3 at: http://www.bentongue.com/. Ben Tongue ------------------------------ From: wb3fau@att.net To: Old Tube Radios Subject: damaged ferrite slugs Date: Sun, 10 Jun 2007 13:32:25 +0000 Message-Id:=20 <061020071332.543.466BFD68000D87C50000021F21587667559A0E00CC0D99@att.net> Gentlemen, is there some method of freeing up frozen,=20 damaged tuning slugs in IF cans? I heard talcum powder will help? These cans are a bit unusual as they=20 contain transformers for both AM and FM band in same can. 455kc for the= =20 AM and 8.3mc for the FM. Russ. ------------------------------ Message-ID: <002401c7ab69$4a140410$640fa8c0@radioroom> From: "Tom Rauch" To: Old Tube Radios Subject: Re: damaged ferrite slugs Date: Sun, 10 Jun 2007 10:11:42 -0400 MIME-Version: 1.0 Content-Type: text/plain; format=3Dflowed; charset=3D"iso-8859-1"; reply-type=3Doriginal Content-Transfer-Encoding: 7bit > Gentlemen, is there some method of freeing up frozen, > damaged tuning slugs in IF cans? > I heard talcum powder will help? These cans are a bit > unusual as they contain transformers for both AM and FM > band in same can. 455kc for the AM and 8.3mc for the FM. > Russ. Other than wax, in which case a gentle warming from a high wattage bulb (like a 60 or 75 w bulb) will help, I very rarely see frozen slugs. The most common "frozen slugs" I ever find are ones that have been cracked. It is very easy to crack them if someone uses a metal hex wrench or something else other than a properly sized non-metallic alignment tool. If the slugs are cracked they need to be very carefully broken out and replaced. 73 tom ------------------------------ Message-ID: <003401c7ab9f$0ea0fdd0$799e480c@KB6NAX> From: "Arden Allen" To: Old Tube Radios Subject: Re: damaged ferrite slugs Date: Sun, 10 Jun 2007 13:36:34 -0700 MIME-Version: 1.0 Content-Type: text/plain; charset=3D"iso-8859-1" Content-Transfer-Encoding: 7bit This is a subject oft taken up here. Whenever a slug is stuck, I have learned the hard way, to NEVER force the issue. The most common stuck slugs I encounter are broken hex hole slugs. The more force you apply the more the two pieces spread apart and lock themselves in the form. Apply enough torque and severe damage to the transformer will occur. In every case I drilled the slug out with a sharp drill bit, applying very slight pressure such that the drill slowly wears away material so that what remains can be broken out. The diameter of the drill bit should be small enouigh that drilling into the form is avoided but large enough that the remaining material can be removed with a needle point tool. Theoretically one could instill super glue into the hex hole and glue the slug halfs back together but the danger is too much glue will glue the slug into the form and then things would be worse off. Such a consideration would be advisable when there is little likelihood a replacement slug could be obtained. A glued slug will have a slightly different characteristic because of the added gap. The problem with finding replacement slugs is getting one with the right ferrite or powdered iron permeability and temperature coefficient. There's where hours of trial and error come into play. Recently a friend gave up trying to get a vintage Fisher monophonic FM tuner to stop drifting off station as it warmed up. After trying several cores from my collection, mostly obtained from scrapped TV chassis, I found one that perfectly temperature compensated the oscillator. Apparently someone mixed up the cores at the Fisher factory. After all, they do all look alike :-) Arden Allen KB6NAX ------------------------------ Message-ID: <001701c7aba5$85adc560$a8e3fea9@gene> From: "Soundval" To: Old Tube Radios Subject: Question re: Butternut HF6V vertical antenna Date: Sun, 10 Jun 2007 14:22:58 -0700 MIME-Version: 1.0 Content-Type: text/plain; format=3Dflowed; charset=3D"iso-8859-1"; reply-type=3Doriginal Content-Transfer-Encoding: 7bit There is supposed to be a 75ohm Coax direct to the HF6V antenna; which then connects directly to a 52 ohm Coax connected to the transmitter/tuner. How long is this 75 ohm Coax? I would be interested in hearing from any person who actually successfuly substituted a better performing item instead of this 75ohm Coax. Eugene Rippen, WB6SZS ------------------------------ Message-ID: <002701c7abbb$50a56880$a531bb40@k9a1e1> From: "John Gillespie" To: Old Tube Radios Cc: "old tube radios" Subject: Re: damaged ferrite slugs Date: Sun, 10 Jun 2007 19:58:56 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset=3D"iso-8859-1" Content-Transfer-Encoding: 7bit Be careful freeing up frozen slugs in IF cans as the coil form often has a poor glue bond to the base material, too much twisting and the coil form will turn instead of the slug and it often breaks all the tiny wires. been there done that! several times....I've heard, that sometimes you can warm the slugs and initiate turning, I've never done it. I usually just replace the damaged transformers, john Subject: damaged ferrite slugs > Gentlemen, is there some method of freeing up frozen, damaged tuning slugs in IF cans? ------------------------------ Message-ID: <466C9210.8000301@tbc.net> Date: Sun, 10 Jun 2007 19:06:40 -0500 From: Steve Berg MIME-Version: 1.0 To: Old Tube Radios Subject: Re: damaged ferrite slugs Content-Type: text/plain; charset=3DISO-8859-1; format=3Dflowed Content-Transfer-Encoding: 7bit Since we are on the subject of tuning slugs, does anyone here know what sort of slug goes into the Gonset G-76 6 meter Local Oscillator coil? I'm starting to rehab mine and it has had a "temporary fix" slug since I bought it in 1965. 73, Steve WA9JML ------------------------------ Message-Id: <6.2.1.2.2.20070610201036.0302a9e0@pop-server.nc.rr.com> Date: Sun, 10 Jun 2007 20:11:08 -0400 To: Old Tube Radios From: john Subject: Re: damaged ferrite slugs Mime-Version: 1.0 Content-Type: text/plain; charset=3D"us-ascii"; format=3Dflowed Its a darn shame that half baked fixes only last 42 years these days! :-) John K5MO At 08:06 PM 6/10/2007, Steve Berg wrote: >Since we are on the subject of tuning slugs, does anyone here know what >sort of slug goes into the Gonset G-76 6 meter Local Oscillator coil? I'm >starting to rehab mine and it has had a "temporary fix" slug since I >bought it in 1965. > >73, > >Steve WA9JML ------------------------------ Mime-Version: 1.0 Message-Id: Date: Mon, 11 Jun 2007 00:54:08 -0400 To: Old Tube Radios From: Richard Post Subject: Re: damaged ferrite slugs Content-Type: text/plain; charset=3D"us-ascii" ; format=3D"flowed" I use a small drill bit clamped in vise grip pliers to gently ream out the broken pieces. For the radio that needed this treatment most recently, see "Repairing an open IF peaking coil" in the following: http://oak.cats.ohiou.edu/~postr/bapix/Swan250.htm Rich KB8TAD > > > > Gentlemen, is there some method of freeing up frozen, damaged = tuning >slugs in IF cans? ------------------------------ From: Buzz To: Old Tube Radios Cc: Old Tube Radios Subject: Re: damaged ferrite slugs Date: Sun, 10 Jun 2007 22:16:38 -0700 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=3Dus-ascii Content-Transfer-Encoding: quoted-printable I have had good results on hex cores using a red hot Allen wrench. Use a=3D wrench that you don't care about because the heat will remove the temper. I =3D just heat the wrench then put it in the core with gentle clockwise pressure, and =3D usually after a few seconds the core will turn. I go clockwise first in case =3D the core was sealed then I can clean out the sealer, then remove the core. The other thing I've used is a heat gun for slotted cores but I haven't =3D had real good results with that. I busted my first cores when I was a teenager working on a ARR-7. =3D Fortunately I was able to some from a junker at the surplus store where I bought =3D mine. Since then I have saved every core from anything that them before I threw it =3D out. I'm now 69 years old and have a cigar box (remember those?) half full of =3D cores. BTW the core make good inductors and transformers for tiny circuits. Buzz On Sun, 10 Jun 2007 13:32:25 +0000, you wrote: >Gentlemen, is there some method of freeing up frozen, damaged tuning= =3D slugs in IF cans? >I heard talcum powder will help? These cans are a bit unusual as they = =3D contain transformers for both AM and FM band in same can. 455kc for the AM =3D and 8.3mc for the FM. Russ. ------------------------------ End of BOATANCHORS Digest 4059 ******************************