20070107.ba v03_n993.bam.20070107 >From ???@??? Sun Jan 7 10:45:32 2007 -0600 Date: Sun, 7 Jan 2007 16:43:56 GMT From: Old Tube Radios To: Old Tube Radios Subject: BOATANCHORS digest 3993 Message-Id: <20070107164359.48FC3187AD6@srvr1.theporch.com> BOATANCHORS Digest 3993 Topics covered in this issue include: 1) Re: [Milsurplus] Extra Class AM Window 3685 KC by john 2) Re: [Milsurplus] Extra Class AM Window 3685 KC by "John Page" 3) Countersaurus resurrected by "Morris Odell" 4) RE: Countersaurus resurrected by "Grant Youngman" 5) Re: Countersaurus resurrected by "Marty Reynolds' debris field" 6) Re: Countersaurus resurrected by "Arden Allen" 7) Re: DuMont by ail0@att.net 8) Lifting things by Scott Robinson 9) RE: DuMont by AB Bonds 10) RE: DuMont & color wheels by "Nick England" 11) Re: Lifting things by "Arden Allen" 12) Re: Lifting things by Dan Arney 13) RE: DuMont & color wheels by "Lenox Carruth" 14) DuMont and other o'scopes needs by "Eric Jones" 15) Re: Lifting things by "Brian A Clarke" 16) Wanted: TMC transmitter by Heinz Breuer 17) Free Iron and Parts by John Poulton 18) Re: Countersaurus resurrected by "Morris Odell" 19) Metal 6AU6 (?) by "James C. Garland" <4cx250b@muohio.edu> 20) Re: Metal 6AU6 (?) by Richard Post 21) NDB Beacon ID and Fishing Float Beacon Questions by Christopher Bowne 22) Re: Metal 6AU6 (?) by Bob Roehrig 23) Re: NDB Beacon ID and Fishing Float Beacon Questions by Bob Roehrig 24) Re: Metal 6AU6 (?) by Al Klase ---------------------------------------------------------------------- Message-Id: <6.2.1.2.2.20070104201307.03c06aa0@pop-server.nc.rr.com> Date: Thu, 04 Jan 2007 20:14:52 -0500 To: Old Tube Radios From: john Subject: Re: [Milsurplus] Extra Class AM Window 3685 KC Cc: Old Tube Radios , Milsurplus Radios Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Excellent post Tom.... but I think the ARRL is about as enthusiastic about supporting AM operations as they are CW. John K5MO At 07:18 PM 1/4/2007, Tom Rauch wrote: >That's fine for Extras but not Generals or Advanced. > >Another problem with the low end (below 3800) is that frequency range is >the common band for the entire world. > >What might work better would be applying pressure on the ARRL and/or IARU >for a real AM Window as part of a bandplan. Bandplans are enforceable in >the USA because the burden of proof in a dispute falls on those operating >in violation of the bandplan. ------------------------------ Message-ID: From: "John Page" To: Old Tube Radios Cc: milsurplus@mailman.qth.net Subject: Re: [Milsurplus] Extra Class AM Window 3685 KC Date: Fri, 05 Jan 2007 03:03:40 +0000 Mime-Version: 1.0 Content-Type: text/plain; format=flowed I was on 3685 this evening. There were at least 6 AM stations on. K4KYV,W5JO,K4KWM and several others that I cant recall their calls now that I am upstairs. Unfortunatly I "blew" an antenna tuner and had to call it quits for the nite. But the others were on for quite a spell. No interference at all. It was a joy to open up the R390A to 16kcs and really enjoy the good sounding audio without hearing Donald Duck up and down the band. 3685 may well be a good place to hang our shingle. John John Page K4KWM Hollow State since 1953 (ex W8PKU,N8BLB,NA8O) >From: john >Reply-To: johnmb@nc.rr.com >To: Old Tube Radios >CC: Old Tube Radios , Milsurplus Radios > >Subject: Re: [Milsurplus] Extra Class AM Window 3685 KC >Date: Thu, 04 Jan 2007 20:14:52 -0500 > > >Excellent post Tom.... but I think the ARRL is about as enthusiastic about >supporting AM operations as they are CW. > >John K5MO > > > >At 07:18 PM 1/4/2007, Tom Rauch wrote: > >>That's fine for Extras but not Generals or Advanced. >> >>Another problem with the low end (below 3800) is that frequency range is >>the common band for the entire world. >> >>What might work better would be applying pressure on the ARRL and/or IARU >>for a real AM Window as part of a bandplan. Bandplans are enforceable in >>the USA because the burden of proof in a dispute falls on those operating >>in violation of the bandplan. > _________________________________________________________________ Get FREE Web site and company branded e-mail from Microsoft Office Live http://clk.atdmt.com/MRT/go/mcrssaub0050001411mrt/direct/01/ ------------------------------ Message-ID: <000701c730bb$d545d690$ad00a8c0@Morris1> From: "Morris Odell" To: Old Tube Radios Subject: Countersaurus resurrected Date: Fri, 5 Jan 2007 22:22:49 +1100 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit Hi all, I have just spent a very pleasant holiday week or two restoring the enormous HP 524B counter. Mine has a defence dept label dated 1959 making it 48 years old. Even though it's huge and heavy, the technology is mostly pretty basic and easy to fix. Mine was very dirty and dusty when it arrived. I pulled the tubes and crystal oven and gave it the Tektronix hot water wash treatment followed by a bake in the Aussie summer sun. I had hoped that I could get away without taking out the meters but after the wash they showed signs of water penertation so they had to come out as well. There are a handful of black beauty caps in the 524B as well as some bathtub caps in places where leakage cannot be tolerated. Out they all came and were replaced with modern caps. The bathtubs were rebuilt by a fellow listmember (thanks Brian)! From experience I knew that the decade counter modules suffer from drifty 47K resistors and this one was no exception. Out they all came and were replaced with moden metal films. I also fitted a thermal fuse into the crystal oven to back up the 48 year old thermostat, and an IEC power connector as Aussie power plugs don't pass through the hole in the cabinet, otherwise making it a very bulky captive. I cleaned all the tubes and tested most of them. There were 7 or 8 duds among the 88, mainly in the power supply. The extensive tube testing revealed a fault in my AVO tube tester so some time out ensued to fix THAT one :-) Finally it was time to switch it all on. It came up OK without any disasters but unfortunately wouldn't gate at all! It didn't take long to discover that the fault was in one of the few unique components - the delay line that lets the reset process complete itself before the signal gate opens. This was not a pleasant discovery but I managed to work around it by installing a junker delay line I had been keeping for 30 years. It's really important to be a hoarder in this game :-) The replacement line has only 1/3 the delay time of the original but some component fiddling got it to work OK. It's amazing how many parts of the circuit are interdependent on each other. The resistors in the unit are mostly carbon comps and there were pretty well all in spec with only a couple of higher value ones that had gone high. I aligned it according to the manual but most of the adjustments hadn't drifted much. The counter goes to 11.3 MHz which is in excess of the 10.1 MHz spec. The 10 MHz internal standard measured only 20 Hz off on a modern GPS referenced counter. That's 0.0002% - not bad for 48 years! It's going into a rack as soon as I can get some help to do it. These old boatanchor counters are pretty primitive by today's standards, but they are an important part of history and I think it's important to keep one or two going. Once winter comes I'm going to observe the "std freq out" waveforms using the Tek 555 scoposaurus. There will be about 200 tubes heating the shack when that happens :-) 73 de Morris VK3DOC ------------------------------ From: "Grant Youngman" To: Old Tube Radios Subject: RE: Countersaurus resurrected Date: Fri, 5 Jan 2007 08:56:20 -0600 Message-ID: <000a01c730d9$aa0e9f70$6701a8c0@GYGateway> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit > I have just spent a very pleasant holiday week or two > restoring the enormous HP 524B counter. Mine has a defence > dept label dated 1959 making it 48 years old. Even though > it's huge and heavy, the technology is mostly pretty basic > and easy to fix. Sounds like a fun project. I have a 524C, with the transfer oscillator and a full set of plug-ins that I've never gotten around to repairing. Worked fine at one time, then something smoked around 1990 and I've never even opened it up to see what the trouble is. I can't lift it !!! :-) Grant/NQ5T ------------------------------ Message-ID: <31480.66.147.42.120.1168009125.squirrel@fracas.netboobie.org> Date: Fri, 5 Jan 2007 09:58:45 -0500 (EST) Subject: Re: Countersaurus resurrected From: "Marty Reynolds' debris field" To: Old Tube Radios Cc: "Old Tube Radios" MIME-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1 Content-Transfer-Encoding: 8bit love the ___saurus names 'way to go on the counter Morris ------------------------------ Message-ID: <001301c730e3$7fd5b590$0ae47443@KB6NAX> From: "Arden Allen" To: Old Tube Radios Subject: Re: Countersaurus resurrected Date: Fri, 5 Jan 2007 08:05:35 -0800 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit > ....There will be about 200 tubes heating the shack when that happens :-) Ah,... ha!!!! I KNEW global warming was not coming from the northern hemisphere.... Arden Allen KB6NAX ------------------------------ From: ail0@att.net To: Old Tube Radios Subject: Re: DuMont Date: Fri, 05 Jan 2007 19:21:09 +0000 Message-Id: <010520071921.9140.459EA5240009D458000023B42160376316CF04070E@att.net> The color wheel kludge came from CBS who succeeded in getting the FCC to approve it (shades of BPL). RCA and several companies developed the NTSC system which had to edge because it was compatible with the black and white standard thereby not invalidating all of the many sets already in homes (not at all like the HDTV system which will not work with my, and your NTSC sets.) They were broadcasting the CBS TV from NY at one time. When viewed on a normal (NTSC) TV, you got multiple images due to the different frame frequency. Black and white, of course, because we didn't have the rotating wheel. Image a rotating wheel in a 36" TV!!/ My brother was one of the engineers from RCA Princeton who demonstated NTSC color TV in Washington. Art K3HBA ------------------------------ Mime-Version: 1.0 Message-Id: Date: Fri, 5 Jan 2007 11:24:32 -0800 To: Old Tube Radios From: Scott Robinson Subject: Lifting things Content-Type: text/plain; charset="us-ascii" ; format="flowed" Grant, An friend of mine who does mechanical things but is now about 80 years old can't lift much any more. So, he installed a 500 pound rated electric steel cable winch on the ceiling of his garage (but it could be your shack). It sorts out the lifting problem nicely, used iwth a small roll-around table to set the lifted item on. Regards, Scott > > I have just spent a very pleasant holiday week or two >> restoring the enormous HP 524B counter. Mine has a defence >> dept label dated 1959 making it 48 years old. Even though >> it's huge and heavy, the technology is mostly pretty basic >> and easy to fix. > >Sounds like a fun project. > >I have a 524C, with the transfer oscillator and a full set of plug-ins that >I've never gotten around to repairing. Worked fine at one time, then >something smoked around 1990 and I've never even opened it up to see what >the trouble is. I can't lift it !!! :-) > >Grant/NQ5T ------------------------------ Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Subject: RE: DuMont Date: Fri, 5 Jan 2007 13:37:18 -0600 Message-ID: From: AB Bonds To: Old Tube Radios > -----Original Message----- > From: owner-boatanchors@theporch.com > [mailto:owner-boatanchors@theporch.com]On Behalf Of ail0@att.net > Sent: Friday, January 05, 2007 1:21 PM > To: Old Tube Radios > Subject: Re: DuMont >=20 >=20 > Image a rotating wheel in a 36" TV!!/ Actually, I have a color wheel on a 52" TV--home DLP units use a color= wheel, running at something like 11,000 rpm. Only theaters and expensi= ve projectors use three DLPs. Ob ba content, brings to mind flying spot scanners.... A. B. Bonds ------------------------------ Date: Fri, 05 Jan 2007 15:18:18 -0500 From: "Nick England" Subject: RE: DuMont & color wheels To: Old Tube Radios Message-id: <02c301c73106$a3e7f100$e20212ac@Heathkit2> MIME-version: 1.0 Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7bit Interestingly, there are indeed many color wheel large screen rear-projection TV sets (and computer projectors) currently on the market. The Texas Instruments DLP projector technology uses a white light source shining through a rotating color wheel and then bouncing off a micromirror array chip. During each frame time you get sequential RGB, rather than one color per frame as the old CBS system. There are some expensive DLP projectors which use 3 micromirror arrays and no color wheel, but most consumer products have a rotating color wheel. See http://www.dlp.com/dlp_technology/dlp_technology_overview.asp#3 BA content - I dunno, but I presume Texas Instruments started out with tube-type seismic processing gear? cheers, Nick KD4CPL -----Original Message----- To: Old Tube Radios Subject: Re: DuMont Art K3HBA says..... "Imagine a rotating wheel in a 36" TV!!" ------------------------------ Message-ID: <002301c7311a$a79e2b20$dfe47443@KB6NAX> From: "Arden Allen" To: Old Tube Radios Subject: Re: Lifting things Date: Fri, 5 Jan 2007 14:40:39 -0800 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Another solution is to purchase a lifting cart from McMaster Carr. A heavy item can be raised to any level to put on a shelf, bench, whatever. Conversely the cart can be set to the correct height to retrieve something from a shelf or unload from a truck. NOTHING can stop a BA'er! Arden Allen KB6NAX ------------------------------ Message-ID: <459ED8F4.2070506@pacbell.net> Date: Fri, 05 Jan 2007 17:02:12 -0600 From: Dan Arney MIME-Version: 1.0 To: Old Tube Radios CC: Old Tube Radios Subject: Re: Lifting things Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit PEP BOYS has one on sale in Dallas area for like $99.00 after rebate. Lifts 600 pounds nice big casters well built. Hank KN6DI/5 ------------------------------ From: "Lenox Carruth" To: Old Tube Radios Subject: RE: DuMont & color wheels Date: Fri, 5 Jan 2007 18:22:03 -0600 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="windows-1250" Content-Transfer-Encoding: 7bit I noticed that the newest Samsungs have a LED light source and no color wheel. BA content: I have always wished that I had an old image orthicon tube as I think they are the best looking tube around. Gotta be an Image Orthicon graveyard somewhere. Lenox WS5OVG -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.16.5/616 - Release Date: 1/4/2007 1:34 PM ------------------------------ Message-ID: <000501c73143$fbb34c30$fe04b4d8@yourxb2x7j77gn> From: "Eric Jones" To: Old Tube Radios Subject: DuMont and other o'scopes needs Date: Fri, 5 Jan 2007 21:36:35 -0600 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit de N4TGC Eric The traffic about DuMont's efforts reminded me I need some info for a couple of o'scopes in my collection. While I have a DuMont 274 and 304A (with the loooong-persistance CRT), I don't esp. need info at th mo'. The 1062 're-compete', despite the scurilous comments I've heard, exceeds the HP 182C I have that it apparently copied (which may be a copy of a Tek ...) Of the RCA persuasion, I could use at least a schematic for the 7" WO-56A; I have a manual for the WO-33A & B (one of the few I have working), but not the 3" models 155C, "RCA Institutes" and WO-57A. The sordid-state 505A is up and running tho ... In Heath, I have an OL-1, O-11, and IO's -10 & 30 that need manuals; the IO-4510 is a bedraggled kit, but does have the info with it. The IO-17 is also good there - I use it as I do the WO-33B, for audio work. Don't need info on the OS-8B or G, or OS-34/USM-32; but do for the OS-10/U The USM-281A is also good - my finicky brother even liked that one! Now I get *really* obscure: anybody got manual or schematic for Triumph 830, Browning Labs 'Synchroscope', Knight 5", SICO (Supreme Inst. Co.) TV-80, the JD plug-in for Telequipment D53A (Ford Surplus had it, then folded - darn!), and United Electronics Labs radio school 2" kits (have 3; they're pretty simple, but ...) Also have a Leader LBO-501, HP-1740A, and a pair of CONAR 255's in the queue (sort of) but I have the info on them. I collect CRT-containing devices, as they tend to be cheap (like, if I don't run fast enough, people give them to me!), so I also have an IP-20 panadaptor (don't know what it's to), a couple of Radio Specialty deviation meters (oldies but goodies), and a lone Yaesu YO-100 monitor scope, which as you might expect, is about the only one not for sale ... Please keep this list if you scrounge tube-type instrument info. You never know when you might turn up one of these manuals or schematics ... TIA - and also keep in mind this is hobby for me, and I can't allocate much moola for this ... e ------------------------------ Message-ID: <060301c73160$fa715020$0202a8c0@Belkin> From: "Brian A Clarke" To: Old Tube Radios Cc: Subject: Re: Lifting things Date: Sat, 6 Jan 2007 18:04:57 +1100 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Hi Scott, I do hope that your friend and anyone else who thinks of connecting a winch to a ceiling joist does the sums on bending moment and deflection versus collapse - or gets a qualified structural engineer to do them. You may say that 500 lb is just two well-fed Americans standing on the one point, and therefore the ceiling should stand that - yes, on the floor above that joist there is a lot of load spreading - but at the point where a winch is attached, there is little load spreading. 73 de Brian, VK2GCE. ------------------------------ Message-ID: <459FC3E9.3040805@debitel.net> Date: Sat, 06 Jan 2007 16:44:41 +0100 From: Heinz Breuer MIME-Version: 1.0 To: Old Tube Radios Subject: Wanted: TMC transmitter Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Hello, I am looking for a transmitter made by TMC Technical Material Corp to pair with my GPR-90 receiver and GSB-1 SSB adapter. A SBT-350 would be my first choice but I will consider other models such as the GPT-500. A SBE SSB exciter would be nice too. Although I am located in Germany shipping would be to my friend's address in McKinney, TX. Thanks and all the best for 2007 vy 73 Heinz DH2FA, KM5VT ------------------------------ Date: Sat, 6 Jan 2007 12:34:35 -0500 (EST) From: John Poulton To: Old Tube Radios Subject: Free Iron and Parts Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Few weeks back I took Mike Davidsen up on his kind offer of a load of free surplus parts. At this point I've culled a bunch of parts for my collection, and hauled some of the remainder to a hamfest with some success, but... there's lots of stuff left, 'way too much for me ever to consume, so I'm offering what's left under the same conditions: free for pickup in Chapel Hill, NC. What's left would comfortably fit in a pickup truck bed. There are still quite a few interesting items in the stash. There are several nice medium-sized modulation transformers (8000 ohm/250mA CT primary, 2800 ohm/300mA secondary, weighs 25#, sealed construction). There are lots of oil-filled hv caps in various useful sizes. Lots and LOTS of small transformers and chokes, most of sealed construction. Most, or all, were removed from military equipment. email me if interested... 73, John K4OZY -- ------------------------------ Message-ID: <000b01c73251$21c9c6c0$ad00a8c0@Morris1> From: "Morris Odell" To: Old Tube Radios Subject: Re: Countersaurus resurrected Date: Sun, 7 Jan 2007 22:44:04 +1100 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit Hi all, Thanks to all who replied to my post. It's encouraging to hear from others who have a 524 either working or "on the stack". I have now completely buttoned up this one and have another "C" coming so will end up reasonably experienced with them. I'd be glad to help anyone else with any advice I can if you embark on restoring one of these wonderful relics. 73 to all, Morris ------------------------------ Message-Id: <7.0.1.0.2.20070107072826.023fbd10@muohio.edu> Date: Sun, 07 Jan 2007 07:34:23 -0700 To: Old Tube Radios From: "James C. Garland" <4cx250b@muohio.edu> Subject: Metal 6AU6 (?) Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Hi Gang, Here's a photo of an old Tek scope, with what appears to be a metal 6AU6. I didn't know there was such a thing. This popped up on the vintage Tekronix discussion group. According to some of the list members, it might be a solid state equivalent of the 6AU6, called a "Fetron," which also was news to me. Anybody know about these things? 73, Jim W8ZR photo: http://www.members.aol.com/viking81/metal6au6.jpg ************************* James C. Garland 102 Spur Ranch Road Santa Fe, NM 87540 www.w8zr.net ************************* ------------------------------ Mime-Version: 1.0 Message-Id: Date: Sun, 7 Jan 2007 10:23:17 -0500 To: Old Tube Radios From: Richard Post Subject: Re: Metal 6AU6 (?) Content-Type: text/plain; charset="us-ascii" ; format="flowed" It looks exactly like the 6CB6 replacements I found in a HP-400D VTVM. Tested them in my tube tester (TV-7) as 6CB6, All of the Fetrons showed high transconductance, testing as if they were new 6CB6 tubes or better. All of them also showed some "leakage" between the filament pins and the cathode pin when tested as a 6CB6. If the 6AU6 tests this way, I'll bet your metal 6AU6 is a Fetron. 73, Rich KB8TAD At 7:34 AM -0700 1/7/07, James C. Garland wrote: > According to some of the list members, it might be a solid state >equivalent of the 6AU6, called a "Fetron," >73, >Jim W8ZR > >photo: http://www.members.aol.com/viking81/metal6au6.jpg > ------------------------------ Message-ID: <20070107162015.28361.qmail@web81007.mail.mud.yahoo.com> Date: Sun, 7 Jan 2007 08:20:15 -0800 (PST) From: Christopher Bowne Subject: NDB Beacon ID and Fishing Float Beacon Questions To: Old Tube Radios MIME-Version: 1.0 Content-Type: text/plain; charset=ascii Content-Transfer-Encoding: quoted-printable Heard a bunch of NDBs early this AM on the BC-348 O down around 350-400 kc.= Was able to ID all of them from various listings on the LOFER pages and o= ther googling, but one remains unknown "FO" on apx 400-402 kc. Others inc= luded DDP in Puerto Rico, US stations out to IL, and many PQ Canadians. Any= insight on FO? Forbrisher Bay, maybe? Also heard the ham beacon WD2XSH/10= from NC just above 500 kc. =0A=0AAlso heard many signals with long tones = and then a digital data burst between 1700 and 1800 kc. New type long line= fishing float beacons, using a new digital mode other than the traditional= Morse IDs? Has Morse died another radio death?=0A=0AChris, AJ1G=0AStoningt= on, CT ------------------------------ Date: Sun, 7 Jan 2007 10:31:50 -0600 (CST) From: Bob Roehrig To: Old Tube Radios Cc: Old Tube Radios Subject: Re: Metal 6AU6 (?) Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed On Sun, 7 Jan 2007, James C. Garland wrote: > Hi Gang, > Here's a photo of an old Tek scope, with what appears to be a metal 6AU6. I > didn't know there was such a thing. This popped up on the vintage Tekronix > discussion group. According to some of the list members, it might be a solid > state equivalent of the 6AU6, called a "Fetron," which also was news to me. > Anybody know about these things? > 73, > Jim W8ZR Wothout lookinjg at it, I'll bet it is a FETRON. I don't remember when these came out (in the 70's?) but I do recall that they made a 6AK5 equivalent and guys in 2-way radio service tried to use them in the front ends of the Motorola Sensicon receivers. They didn't work - no good at RF freqs for some reason. Bob Roehrig Aurora University Telecom dept. broehrig@aurora.edu K9EUI W9ZGP WD2XSH/19 630-844-4898 fax 630-844-4222 "Nostalgia is a thing of the past" ------------------------------ Date: Sun, 7 Jan 2007 10:34:57 -0600 (CST) From: Bob Roehrig To: Old Tube Radios Cc: Old Tube Radios Subject: Re: NDB Beacon ID and Fishing Float Beacon Questions Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed On Sun, 7 Jan 2007, Christopher Bowne wrote: Also heard many signals with long tones and then a digital data burst between 1700 and 1800 kc. New type long line fishing float beacons, using a new digital mode other than the traditional Morse IDs? Has Morse died another radio death? That has been going on for a number of hears - the radiolocation stuff. Not sure what the mode/coding is on those sigs. Bob Roehrig Aurora University Telecom dept. broehrig@aurora.edu K9EUI W9ZGP WD2XSH/19 630-844-4898 fax 630-844-4222 "Nostalgia is a thing of the past" ------------------------------ Message-ID: <45A12412.7090803@ar88.net> Date: Sun, 07 Jan 2007 11:47:14 -0500 From: Al Klase MIME-Version: 1.0 To: Old Tube Radios CC: Old Tube Radios Subject: Re: Metal 6AU6 (?) Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Jim, I'm betting Fetron, an FET-based tube replacement. However the ones I see on the web are 9-pin 12AX7 sort of things. For example: http://www2.famille.ne.jp/~teddy/datalib/fetron.htm Al James C. Garland wrote: > Hi Gang, > Here's a photo of an old Tek scope, with what appears to be a metal > 6AU6. I didn't know there was such a thing. This popped up on the > vintage Tekronix discussion group. According to some of the list > members, it might be a solid state equivalent of the 6AU6, called a > "Fetron," which also was news to me. Anybody know about these things? > 73, > Jim W8ZR > > photo: http://www.members.aol.com/viking81/metal6au6.jpg > > ************************* > James C. Garland > 102 Spur Ranch Road > Santa Fe, NM 87540 > www.w8zr.net > ************************* > -- Al Klase - N3FRQ Flemington, NJ http://www.skywaves.ar88.net/ ------------------------------ End of BOATANCHORS Digest 3993 ******************************