10-4 good buddy (-;
Carl
KM1H
----- Original Message -----
From: <donroden@hiwaay.net>
To: <AMPS@contesting.com>
Sent: Thursday, July 02, 2009 9:22 PM
Subject: Re: [Amps] Sweep tube amp
> 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
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