20070126.ba v04_n001.bam.20070126 >From ???@??? Fri Jan 26 10:00:25 2007 -0600 Date: Fri, 26 Jan 2007 15:59:27 GMT From: Old Tube Radios To: Old Tube Radios Subject: BOATANCHORS digest 4001 Message-Id: <20070126155929.207C93183D8@srvr1.theporch.com> BOATANCHORS Digest 4001 Topics covered in this issue include: 1) Re: Meters Needed by Henry van Cleef 2) new tubes. 10 cents each by "Soundval" 3) Re: Signal Corps audio amp query by spr@earthlink.net 4) Re: Dumont and Tektronix by Henry van Cleef 5) Re: Signal Corps audio amp query by "Arden Allen" 6) Re: Signal Corps audio amp query by Al Klase 7) RE: Prosigns in Use in 1912? by "Ed Zeranski" 8) RE: Prosigns in Use in 1912? by w8au@sssnet.com 9) RE: KSM PW-15 Transmitter on YouTube! by "Ed Zeranski" 10) Re: Prosigns in Use in 1912? by WA5CAB@cs.com 11) Re: Prosigns in Use in 1912? by "David Stinson" 12) Re: Signal Corps audio amp query by "Ken Hickman" 13) Push-Pull-Push Oscillator by "JAMES HANLON" 14) Re: Dumont and Tektronix by W0EOM@aol.com 15) How can I test a 903 CRT by "Soundval" 16) How can I test a 903 CRT by Rhett George 17) Re: Prosigns in Use in 1912? by w8au@sssnet.com 18) Re: [Milsurplus] German aircraft sets by "David Stinson" 19) WTB: TRIMM FEATHERWEIGHT Headphones by "Freeberg, Scott \(STP\)" 20) W. J. Ford - German aircraft sets by "Al Parker" ---------------------------------------------------------------------- From: Henry van Cleef Message-Id: <200701250305.TAA25958@eskimo.com> Subject: Re: Meters Needed To: Old Tube Radios Date: Wed, 24 Jan 2007 20:05:14 -0700 (MST) Cc: boatanchors@theporch.com (Old Tube Radios) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit The esteemed Al Klase has said: > > Hi Greg, > > The Hallicrafters meter may be difficult to find. The problem is > compounded by the fact that it reads backwards, zero current is to the > right. If its simply a matter of the brass case being split, (hydrogen > embrittlement?) put an automotive hose clamp around it. I've done this > a couple of times with SX-24's and SX-25's. The other alternative is to > mount a normal meter upside-down (yuck). > A third (and more satisfying, to me at least) is to rework the circuit to use a left-zero meter. S-meter circuits are Wheatstone bridge circuits. The Hallicrafters version has only three resistors (the fourth leg is "infinity." The "variable" or "unknown" leg is either plate current or cathode current in an AVC-controlled tube. As I recall, Hallicrafters always used the plate side (which is why the meters got toasted---mixing ground with B+). I like the cathode current circuit better (RME-45 and 69 use this, with four legs and forward-reading). In a four-resistor circuit vs. the Hallicrafters 3-resistor, you move the zeroing pot (always a wire-wound, as it carries DC) to null the current across the meter at maximum current, rather than minimum, and swap the "unknown" leg with the "known" leg in the variable side. Pick a value for that "known" fixed resistor that gives full-scale deflection on high signal. As I recall, on a 6SK7, with 3 volts initial bias and 100 volts on the screen, zero-signal cathode current is around 12 ma., and strong signal reduces it to about 2 ma (check the tube manual "typical operation," which give the values for 100-volt screen). Plate currents are about 2/3rds of that (rest is screen current). Also, I **always** put 1N400X diodes, one in each direction, across the meter terminals. Most S-meters have 250 Mv across their terminals at full scale; the diodes start conducting at about 450 ma., so don't affect meter readings, but limit maximum meter current to double full-scale, which they'll tolerate. Hank -- Hank van Cleef (vancleef@eskimo.com, hvanclee@nyx.net) 1986 420SEL "A stranger in paradise" (Fremont Co. Wyoming) 1986 GMC 1500 6.2 diesel pickup "Seen one, seen them all" ------------------------------ Message-ID: <013301c7402e$94ee7fc0$a8e3fea9@gene> From: "Soundval" To: Old Tube Radios Subject: new tubes. 10 cents each Date: Wed, 24 Jan 2007 19:11:59 -0800 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit I have 440 tubes mostly new in boxes. 10 cents each. 415 Miniature tubes. 3---s, 4---s, and 5---s. Mostly new. A random check ( 20 ) was 70% new. These are untested. New, unless stated otherwise.) Boxed, unless stated otherwise. SEE PICTURES! PLUS!!! 25 rectifiers. (New and boxed unless stated otherwise) (1)3B2 USED UNBOXED (1)3DS3 UNBOXED (2)3B2 (5)3DG4 (2)3DG4 USED (1)3A3A (2)3A3C (1)3A3C USED (1)3DF3 (1)3DC3 (1)3AT2B (1)3DS3 (1)3CU3A (1)5BC3A (Used maybe) (1)3BW2/ 3BS2A/ 3BT2 (1)3AW2A (1)3AT2B (103CN3B Figure 20 pounds for calculating shipping. http://www.muchstuff.com/pics/415/415A.JPG http://www.muchstuff.com/pics/415/415B.JPG http://www.muchstuff.com/pics/415/415C.JPG Eugene Rippen, WB6SZS 105 Donnington Auburn, CA 95603 ------------------------------ Message-ID: <27030078.1169694814918.JavaMail.root@elwamui-norfolk.atl.sa.earthlink.net> Date: Wed, 24 Jan 2007 22:13:34 -0500 (EST) From: spr@earthlink.net To: Old Tube Radios Subject: Re: Signal Corps audio amp query Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Well now Arden... First, the cost guys probably drove pentode usage because they were more efficient. I heard that an engineer at a trade show circa 1930, said of a type 547 power pentode, "Just what I needed; 30% distortion in a bottle!" Second, pentodes only work well into a small range of load impedances. Loudspeakers, unfortunately, range over 10:1 or so in impedance, depending on the frequency. Third, getting a tube amp, which necessarily has an output transformer, to be unconditionally stable into a loudspeaker load with 20 dB or more of feedback is not easy, and raises the cost of the output transformer. Fourth, pentodes generate higher order-and therefore more audible-distortion, much of it odd-order, which push-pull circuitry won't cancel. A screen tap output stage, with the taps at about 40%, give you most of the efficiency of pentodes and most of the benefit of triodes. It does generate perhaps 20% fewer watts. For those inclined to esperiment, be warned that not all pentodes are well suited to untra-linear service. 6146s, in particular, have a considerably lower maximum screen voltage than plate voltage, so you either beat up the screen or lose maximum power potential. 807s have the same problem--600V plate, 300 V screen. I am *not* an audiophoole, and I do audio design (not tubes, sorry...) for a living. Regards, Scott -----Original Message----- >From: Arden Allen >Sent: Jan 24, 2007 9:26 PM >To: Old Tube Radios >Subject: Re: Signal Corps audio amp query > >> As I understand it, ultralinear was a term used in audio engineering >> articles of the 50's in referring to Blumlein's 1937 patent number >> 496,883 "Improvements in or relating to Thermionic Valve Amplifying >> Circuits". Blumlein tested the use of screen taps on output >> transformers to try to combine the best of both triodes (reduced >> distortion) and pentodes (increased power). And yes, nearly all the >> high end consumer push/pull tetrode and pentode tube amps of the 50's >> use the Blumlein circuit, as identified by the output transformer >> taps. > >Yup, that's right, Rich. It's a laughable invention, though. Pentodes >aren't all that non-linear compared to triodes when operated properly. >You'd think tube designers knew nothing about distortion to have replaced >triodes in practically every application needing the power sensitivity a >triode can't provide. Side by side with triodes power pentodes have the >advantage of needing less distortion adding gain that triodes need to be >driven to full power. And then the much reviled by today's audiphooles >negative feedback knocks all bets into a cocked hat. Lots of hooey in the >audio world. > >Arden Allen >KB6NAX > ------------------------------ From: Henry van Cleef Message-Id: <200701250352.TAA27551@eskimo.com> Subject: Re: Dumont and Tektronix To: Old Tube Radios Date: Wed, 24 Jan 2007 20:52:00 -0700 (MST) Cc: boatanchors@theporch.com (Old Tube Radios) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit The esteemed Morris Odell has said: > > > ----- Original Message ----- > From: "Henry van Cleef" > > Subject: Re: Dumont and Tektronix > > > > A great filleted description of Tek history. I belive it's also true that > Tek started out buying CRTs from RCA and Dumont. They went into CRT > manufacturing when it became evident that their suppliers were supplying > them imperfect tubes and keeping the best quality ones for their own > products. > My recollection is that RCA quality became a major issue for Tek. I'm not sure how much (if anything) they were buying from Dumont when their scopes started to dominate the market. However, there were some other reasons for setting up that in-house CRT line. One is that it allowed Tek to use their own bottle designs, without having to pay setup charges, etc. Another is that it allowed them to design gun elements for the 545 (distributed amp, 600 ohm impedance, open-terminated) and 585 (segmented plates maintaining source impedance and external matching termination at the other end. Tek did a lot of vertical integration (timing circuit capacitors, variable gain pots for vertical amps, transformers) and were doing sufficient volume to justify the capital investment. They also had the advantage of being located in a low-wage area. While the value of having an in-house transformer shop is arguable vs. sourcing from small transformer-winder job shops, I don't think this is true of CRT's. Both RCA and Dumont drew on a New Jersey labor pool, and were union shops to boot. Another consideration (with CRT's) is that home entertainment took off like a big bird ca. 1950. In many ways, television CRT's are different animals from oscilloscope CRT's, so an RCA or a Rauland would have to divert shop capacity to running a separate line with separate standards for scope CRT's. It's several people's opinion that Dumont's CRT capabilities were tops for the type of CRT needed for state-of-the-art oscilloscopes; that Tektronix was a close #2, and Hewlett-Packard (a very late entrant) a distant #3. But Dumont had a very high cost base, limited plant space, and a very good profitable business doing radar and scan-conversion CRT's. Arguably, the Faraday shield CRT in the Dumont 766 was a better bottle than the Tek CRT in the 547. In the long run, for Tek to have relied on the one other US CRT manufacturer with capabilities to supply them, when they were stealing the market right out from under that manufacturer----that would have been a poor business decision. Of course, had these needs come up after about 1965, rather than in the early 1950's, a good Japanese source would have been a good choice. Tek ultimately did go the Japanese route with Sony-Tektronix Corp in 1963, but that drew on an industrial capability that didn't exist in 1952. Hank -- Hank van Cleef (vancleef@eskimo.com, hvanclee@nyx.net) 1986 420SEL "A stranger in paradise" (Fremont Co. Wyoming) 1986 GMC 1500 6.2 diesel pickup "Seen one, seen them all" ------------------------------ Message-ID: <003001c74034$53771a60$f8e47443@KB6NAX> From: "Arden Allen" To: Old Tube Radios Subject: Re: Signal Corps audio amp query Date: Wed, 24 Jan 2007 19:53:02 -0800 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit > Well now Arden... Yup, yup, yup. All good ivory tower points (no offense intended), Scott. But I'll stick to my guns. If you are building a hi-fi amp you have a lot more choices than just pentodes v/s triodes. And of course you don't want junk for an output transformer. And the elephant (or is it a giant octopus?) in the room is just what you alluded to - distortion. No decent amplifier would be much use if everythng that came out of it was burdened with 30% THD. Drive the crap out of it and get more. Run is nicely and get a less. Output transformers are responsible for more IMD, something no one seems to know anything about. And like I said, NF helps to curtail much of the remaining distortion after a design has been properly done before the NF is applied. Stability control is a problem with output trannys that resonate too close to the audible range. Good trannys push it out to 100kHz or so and with NF roll off quite nicely with good transient response in the audio+ range. Lets be honest. Pentodes just make different kinds of distortion that offends the golden eared ones. A decent pentode design is not offensive to folks with ears that listen to the sound and not the gear. It's that psychoacoustic adaptiveness we all suffer from. Economics was a big relativistics enforcing factor in the tube era. Much easier today when IC jungles do all the dirty work and designers only have to hook up the innies and outies ;-) Arden ------------------------------ Message-ID: <45B8346E.1090503@ar88.net> Date: Wed, 24 Jan 2007 23:39:10 -0500 From: Al Klase MIME-Version: 1.0 To: Old Tube Radios CC: Old Tube Radios Subject: Re: Signal Corps audio amp query Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit spr@earthlink.net wrote: > Well now Arden... > > First, the cost guys probably drove pentode usage because they were more efficient. I heard that an engineer at a trade show circa 1930, said of a type 547 power pentode, "Just what I needed; 30% distortion in a bottle!"..... > > A great technical run-down, Scott. Thanks. One need only listen to a Hammarlund Super-Pro (push-pull triode-connected 6F6's with decent transformers) connected to a good speaker for a while, and compare it to radios of that era running pentodes, to understand. Regards, Al -- Al Klase - N3FRQ Flemington, NJ http://www.skywaves.ar88.net/ ------------------------------ From: "Ed Zeranski" To: Old Tube Radios Subject: RE: Prosigns in Use in 1912? Date: Wed, 24 Jan 2007 21:04:23 -0800 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Well.......ZUJ ------------------------------ To: Old Tube Radios From: w8au@sssnet.com Subject: RE: Prosigns in Use in 1912? Date: Thu, 25 Jan 2007 05:21:48 GMT Message-Id: <20070125052150.283703183BC@srvr1.theporch.com> ED Z wrote: > Well.......ZUJ How long? :-) ZBM2.... Perry w8au ------------------------------ From: "Ed Zeranski" To: Old Tube Radios Subject: RE: KSM PW-15 Transmitter on YouTube! Date: Wed, 24 Jan 2007 21:27:36 -0800 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Enjoy, RD =20 Indeed! Good on ya' Dickie D'!!!! Thank you EdZ ------------------------------ From: WA5CAB@cs.com Message-ID: Date: Thu, 25 Jan 2007 00:50:08 EST Subject: Re: Prosigns in Use in 1912? To: Old Tube Radios MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_d1c.39262cd.32e99f10_boundary" --part1_d1c.39262cd.32e99f10_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Oooh. Perry, that's cold. :-) Reminds me of a trick a buddie of mine told me they used to play on ARVN troops. The command sequence was "Stand by to disregard". You can probably guess the rest. In a message dated 1/24/2007 11:23:17 PM Central Standard Time, w8au@sssnet.com writes: > ED Z wrote: > > >Well.......ZUJ > > How long? :-) > > ZBM2.... Robert Downs - Houston (Web Store) MVPA 9480 (Primary email) (Backup email) --part1_d1c.39262cd.32e99f10_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_d1c.39262cd.32e99f10_boundary-- ------------------------------ Message-ID: <002101c74079$ed482fe0$fa01fea9@Default> From: "David Stinson" To: Old Tube Radios Subject: Re: Prosigns in Use in 1912? Date: Thu, 25 Jan 2007 06:11:20 -0600 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit ZAA you two ;-) ----- Original Message ----- From: Subject: RE: Prosigns in Use in 1912? > ED Z wrote: > > > Well.......ZUJ > > How long? :-) > > ZBM2.... > > Perry > w8au > ------------------------------ Message-ID: <003b01c7405d$d82e5600$6b9c1f45@rtconline.com> From: "Ken Hickman" To: Old Tube Radios Subject: Re: Signal Corps audio amp query Date: Thu, 25 Jan 2007 08:50:13 -0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Hi Al & Gang, For audio quality, the old Hallicrafters SX-16 can't be beat! As I recall push-pull 6V6's driving a separate loudspeaker fed with a 5000 ohm line with a step-down transformer mounted in the speaker case. Very few audio systems can be turned up to high volume without "pain" to the listener but the old gal, SX-16, could be elevated to high volume and not be painful, a measure of fidelity. In my opinion, pain from loud sound is caused by distortion! FWIW, Ken N5CM ----- Original Message ----- From: "Al Klase" To: "Old Tube Radios" Cc: "Old Tube Radios" Sent: Thursday, January 25, 2007 4:39 AM Subject: Re: Signal Corps audio amp query > spr@earthlink.net wrote: > > Well now Arden... > > > > First, the cost guys probably drove pentode usage because they were more efficient. I heard that an engineer at a trade show circa 1930, said of a type 547 power pentode, "Just what I needed; 30% distortion in a bottle!"..... > > > > > A great technical run-down, Scott. Thanks. One need only listen to a > Hammarlund Super-Pro (push-pull triode-connected 6F6's with decent > transformers) connected to a good speaker for a while, and compare it to > radios of that era running pentodes, to understand. > > Regards, > Al > > -- > Al Klase - N3FRQ > Flemington, NJ > http://www.skywaves.ar88.net/ > > ------------------------------ Message-ID: From: "JAMES HANLON" To: Old Tube Radios Subject: Push-Pull-Push Oscillator Date: Thu, 25 Jan 2007 12:16:14 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_014E_01C7407A.9BB13C20" This is a multi-part message in MIME format. ------=_NextPart_000_014E_01C7407A.9BB13C20 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I think I remember someone on the BA Reflector looking for an article on = the Push-Pull-Push Oscillator. I found one while browsing, in the May = 1935 QST, page 53 to 56. It is written by J. Stanley Brown, W3EHE (what = a CW call!). It uses a pair of 59's. Their plates are connected in = push-pull for fundamental output and in parallel (or push-push) for = second harmonic output. =20 Hope this is of interest, Jim, W8KGI ------=_NextPart_000_014E_01C7407A.9BB13C20 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_014E_01C7407A.9BB13C20-- ------------------------------ From: W0EOM@aol.com Message-ID: Date: Thu, 25 Jan 2007 14:35:18 EST Subject: Re: Dumont and Tektronix To: Old Tube Radios MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1169753718" -------------------------------1169753718 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Hank - that's a great summary of Tek relating to their crt's. Do you have a copy of 'Winning with People: The First 40 years of Tektronix"? Its all in there , just as you said, and more. Starting up their own line was not an easy task. Will Jensby -------------------------------1169753718 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 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -------------------------------1169753718-- ------------------------------ Message-ID: <003f01c740bf$c1bf4f20$a8e3fea9@gene> From: "Soundval" To: Old Tube Radios Subject: How can I test a 903 CRT Date: Thu, 25 Jan 2007 12:31:11 -0800 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit CAN ANYONE PLEASE TELL ME HOW TO TEST A 903 CRT ? Or can it be done, on any of the following tube testers: The tube is not in any of the charts that I have. Hickok 800A TV-7D/U Precision 912 Sencore MU150 TB 2B/U Gene Rippen, WB6SZS ------------------------------ Date: Thu, 25 Jan 2007 16:27:39 -0500 From: Rhett George To: Old Tube Radios Subject: How can I test a 903 CRT Message-ID: <20070125212739.GD23519@ee.duke.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline - Greetings - Gene, that is a good question. Hopefully, you have the base diagram for the 903. Use an ohmmeter to check heater continuity. I would set the socket selector switches for the heater, cathode, control grid, and accelerator grid (as the plate). Since 1 mA is in the range of beam currents, look for and use the settings for a very low power triode (battery set tube). For an emission test, use the accelerator grid as the plate and check it as a detector diode for a battery set. I would not leave the test button depressed for more than a couple of seconds. Good luck with it. 73 Rhett - KE4HIH ------------------------------ To: Old Tube Radios From: w8au@sssnet.com Subject: Re: Prosigns in Use in 1912? Date: Fri, 26 Jan 2007 02:34:27 GMT Message-Id: <20070126023422.2992E3183BB@srvr1.theporch.com> Dave Stinson wrote: > ZAA you two ;-) Good one!! but I would reply: ZAX6 ZKB EdZ > ----- Original Message ----- > From: > Subject: RE: Prosigns in Use in 1912? > > > > ED Z wrote: > > > > > Well.......ZUJ > > > > How long? :-) > > > > ZBM2.... > > > > Perry > > w8au ------------------------------ Message-ID: <004a01c7415c$662efaa0$fa01fea9@Default> From: "David Stinson" To: Old Tube Radios Subject: Re: [Milsurplus] German aircraft sets Date: Fri, 26 Jan 2007 09:12:24 -0600 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Good God! Someone, Please intervene. Is there anyone who knows someone with the resources to save this historic equipment?? ----- Original Message ----- From: "Ralph Cameron" Subject: [Milsurplus] German aircraft sets I mentioned about 5 months ago that W.J.Ford Surplus sales in Smith Falls On( near Ottawa) was going out of business and an auction followed. There are still some German aircraft and tank radios as well as some British types. Next week a scrap dealer comes to quote on "removing" the balance remaining. His email is closed and not working but interested parties can phone directly at 613-283-5195. If no one answers it means he's busy. Leave a message with what you want and request he call you ------------------------------ Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Subject: WTB: TRIMM FEATHERWEIGHT Headphones Date: Fri, 26 Jan 2007 09:55:54 -0600 Message-ID: <159D9606C7F1304C8059DAEB6B2ED8BE01BBE666@STPEVS01.stp.guidant.com> From: "Freeberg, Scott \(STP\)" To: Old Tube Radios I'd like to find a nice pair of high impedance TRIMM "Featherweight" = headphones for my regen receiver project. I understand there were = several impedances offered. A friend is using a 5K ohm pair with his = regen receiver and is raving about it :) I'd like to find either a 4K = or 5K pair for my regen project. Looking for clean and nice condition. Thanks. 73, Scott WA9WFA ------------------------------ Message-ID: <07b201c74162$f764b040$3201a8c0@w8ut> From: "Al Parker" To: Old Tube Radios Subject: W. J. Ford - German aircraft sets Date: Fri, 26 Jan 2007 10:59:30 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Hi guys, I had forgotten that they had quit business, this week I asked for avaliability of a manual (for a Redifon R408 receiver), and got the following response, looks almost an automatic thing, but Ron did add that they were having ISP problems. I haven't received another response to my followup question. If anyone finds out anything, please post to the lists. 73, Al, W8UT New Bern, NC BoatAnchors appreciated here http://www.boatanchors.org http://www.hammarlund.info ----- Original Message ----- From: To: Sent: Monday, January 22, 2007 2:24 PM Subject: Closing & Auction > Thank you for your inquiry - please note that as of October 1st we will be closing our doors. > > We have asked Danbury Sales to help dispose of our remaining inventory & they will be holding an on-line Auction Tusesday, October 24th, 2006. Details are available on their website: > > www.danburysales.com > e-mail: danburymail@danburysales.com > > Thanks & regards, > Ron Ford > > P.S. our ISP is having email "issues" and I can only download our email intermittently. > ================================== ----- Original Message ----- From: "David Stinson" To: "Old Tube Radios" Sent: Friday, January 26, 2007 10:12 AM Subject: Re: [Milsurplus] German aircraft sets > Good God! > Someone, Please intervene. > Is there anyone who knows someone with the resources > to save this historic equipment?? > > ----- Original Message ----- > From: "Ralph Cameron" > Subject: [Milsurplus] German aircraft sets > > > I mentioned about 5 months ago that W.J.Ford Surplus sales in Smith Falls > On( near Ottawa) was going out of business and an auction followed. > > There are still some German aircraft and tank radios as well as some British > types. > > Next week a scrap dealer comes to quote on "removing" the balance remaining. > > His email is closed and not working but interested parties can phone > directly at 613-283-5195. If no one answers it means he's busy. Leave a > message with what you want and request he call you > ------------------------------ End of BOATANCHORS Digest 4001 ******************************