http://www.radiowrench.com/siltronix/
Ah Yes........ the Swan 1011 with the "locked-out" 11 meter transmit function.
Don WA4NPL
Quoting Carl <km1h@jeremy.mv.com>:
> I never saw a problem with making money at the expense of CBers as long as
> they stayed put and messed up their own band.
>
> It was when legitimate manufacturers began offering CB and ham HF ready 100W
> and higher transceivers that problems got out of hand.
>
> Carl
> KM1H
>
>
>
>
> ----- Original Message -----
> From: <dennis12amplify@aol.com>
> To: <ny9h@arrl.net>; <AMPS@contesting.com>
> Sent: Thursday, July 02, 2009 2:29 PM
> Subject: Re: [Amps] Sweep tube amp
>
>
>> The sweep tube amplifier shown in the link was custom built for Browning
>> by a now defunct company?that was located in?Joliet, Illinois called
>> Contex. (Also known by many other names,?some of which were?BROWNING and
>> ABC). It was a no-bias sweep tube amp that used two tubes with 13 to
>> 17?watt plate dissipations running at 100 watts,?(and more unless properly
>> tuned). It was one of the 'dirtiest' amplifiers ever built and went thru
>> tubes like a hot knife thru butter. Cherry red plates in 30 seconds of
>> keydown time and no cooling fans!?? Back then, (1960's), those 6JG6 tubes
>> only cost a dollar (or less in quantity) each so?the tube abuse?didn't
>> mean much at the time, but if you price them now you will find?those tubes
>> and all 'equivalent' tubes are?very rare and high priced. The rareness was
>> caused in a large part by the CB use of these CONTEX / ABC / BROWNING,
>> amplifiers by operators who usually didn't know how to tune them. At least
>> Contex rated them as 60 watt amplifiers based
>> on their typical maximum output while Browning rated them at 180 watts
>> which was the theoretical input power that would have been required for a
>> 60 watt output. They had about a 10 DB gain for input powers less than 6
>> watts peak,?and were single banded to 11 meters.?The outside sheet metal
>> and chassis design may have been supplied by?Browning, (Laconia, New
>> Hampshire),?so that the amplifier would match the design of the Browning
>> Golden Eagle CB radio.
>>
>> ?I?have enjoyed?researching the history for these cheap and dirty CB
>> linears and have found that most, if not all, had originated as a result
>> of ham operators trying to make a quick buck! Contex was just one more
>> example of a HAM gone bad who got very rich as a result.
>> ?One perfect example was the ham who started the D&A amplifier Company,
>> (Scottsbluff, Nebraska),?who was so successful that he was frequently
>> advertised?the perfect?example of a very successful NTI (National
>> Technical School) graduate, and was shown next to his delivery van in many
>> full page adds in various electronics magazines that were printed in the
>> late 60's and 70's. ( I believe the D&A stood for Delaney and Adams, but
>> have never verified that fact ).
>>
>> ?Any other trivia anyone may have related to CB linears and their origins
>> would be?welcomed as I have recently considered writing a book on the
>> subject.
>>
>> Dennis O.
>> dennis12amplify@aol.com
>> Living just outside Joliet Illinois
>>
>>
>>
>>
>>
>>
>>
>> -----Original Message-----
>> From: ny9h <ny9h@arrl.net>
>> To: amps@contesting.com
>> Sent: Thu, Jul 2, 2009 9:02 am
>> Subject: Re: [Amps] Sweep tube amp
>>
>>
>>
>> Big bucks,,,,, for thi classic "10 meter" amp....
>>
>>
>> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=190316129891
>>
>>
>> \bill
>>
>>
>>
>>
>> 06:37 AM 6/27/2009, Felipe Ceglia - PY1NB wrote:
>> Hi Angel,
>>
>>> I one recent CQ DL magazine, may 2009 (the one with the CW op YL on
>>> cover), there is a project for a funf-tube PL519 amplifier. If I recall
>>> it correctly it does not use a HV trafo, but for sure the output tank
>>> was PI.
>>>
>>> If anyone have any information about the Fuchreis tuning network, I
>>> would like to hear about it.
>>>
>>> 73,
>>>
>>> Felipe - PY1NB
>>>
>>> Angel Vilaseca wrote:
>>> > Gentlemen,
>>> >
>>> > I just bought an old amp that uses 5 PL 519 TV sweep tubes in parallel.
>>> > As it reads on the box, it was home made on June 1983 by HB9 AWI.
>>> > The amp does not work anymore, but it is superbly built. The builder,
>>> > HB9AWI, obviously put a lot of effort into it.
>>> >
>>> > I would like to restore it. It is so well made and so typical of ham
>>> > state of the art at the end of last Century.
>>> > No inexpensive Russian power tubes were obtainable at these cold war
>>> > times! On the other hand, old color TV sets with sweep tubes still
>>> > alive
>>> > were plentiful. The PL519 had the reputation of being quite rugged.
>>> > Most
>>> > frequently, it was the line output power treansformer of the TV set
>>> > that
>>> > failed, not the tube.
>>> >
>>> > Unfortunately, there was no schematic included with the amp..
>>> >
>>> > The seller told me the design of the circuit was by DL9AH. It is quite
>>> > a
>>> > non-typical design:
>>> > For one, the tank circuit is not a Pi, nor a Pi-L! It is called a
>>> > Fuchkreis. It seems it was invented by an Austrian ham called Fuchs. I
>>> > never saw anything like it.
>>> > The power supply is a transformerless design. Apparently, it delivers +
>>> > and - 300 Volts. So needless to say, the cathode circuit of the five
>>> > PL519s is quite unconventional too. The bias circuit uses two pentodes,
>>> > a PL 504 (a b&w TV sweep tube) and a smaller one. Never saw anything
>>> > like this either!
>>> > There is a separate 10-turn potentiom
>> eter for each PL519 to adjust the
>>> > current through each tube. Quite sensible when you use five second-hand
>>> > tubes, that may have already lived a number of years as sweep tubes in
>>> > TV-sets.
>>> > The power supply, the bias circuit, the relays circuit all have lots of
>>> > VK200s and decoupling caps everywhere.
>>> >
>>> > As I just said, in a true ham spirit, it may use cheap tubes, but
>>> > obviously a lot of care was used to design and build this piece of
>>> > equipment.
>>> >
>>> > So, really, I would like to restore it. I tried finding the DL9AH
>>> > design
>>> > on the web, but no luck!
>>> >
>>> > Does the phrase " Sweep tube amp, DL9AH design" ring a bell? Especially
>>> > for european hams?
>>> >
>>> > Any information about the design, or schematic welcome.
>>> >
>>> > Vy 73
>>> >
>>> > Angel Vilaseca HB9SLV
>>> >
>>> >
>>> > _______________________________________________
>>> > Amps mailing list
>>> > Amps@contesting.com
>>> > http://lists.contesting.com/mailman/listinfo/amps
>>> >
>>>
>>> --
>>> Felipe Ceglia - PY1NB
>>> -------------------------------------------------------------------------------------
>>> PR1T team member /// Rio DX Group member /// Araucaria DX Group member
>>> http://www.dxwatch.com /// http://reversebeacon.net ///
>>> http://riodxgroup.dxwatch.com
>>> _______________________________________________
>>> Amps mailing list
>>> Amps@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>
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