[CQ-Contest] Sweep Tube Amp 1960s... Looking at one NOW

Tue Dec 5 13:18:41 EST 2017

OM,

I am sitting here looking at one I built in 1966..... Miine is in a 
19" rack panel mounting. It was described in a QST article, Back 
then, I was in Pratt Institute 'EE, working part time as a stock boy 
in a Bohack supermarket, spending all my earnings at Barry's Green 
Sheet Surplus Electronics in Radio Row, NYC.  I had seen this 
WONDERFUL article about using sweep tubes, a solid state (silicon 
rectifiers in a voltage doubler config that took input from a surplus 
110VAC to 220VAC 1:2 2.5KW rated Line transformer up to almost 500VDC 
to feed 12 parallel Sweep tubes.  It had a 50 ohm input resistor 
network and the 12 tubes presented a 72 ohm output impedance to a 
continuously tuned Roller Inductor to match the output into a B&W LPF 
going to the antenna.   Even with the LPF, it absolutely destroyed 
some of the TV channels being received by rabbit ear antenns for many 
blocks around my folks apartment.   Luckily, I was sending FSK and no 
one could figure out what strange disaster had found their TV sets 
and channel 5 and channel 2....... ;)   I even used Window screening 
wire for the chassis enclosure material in an attempt to create a 
faraday cage. Hi Hi.

73,

Ben WB2RHM

At 12:00 12/5/2017, you wrote:

>Message: 3
>Date: Mon, 4 Dec 2017 14:01:07 -0800
>From: Tom Osborne <w7why1 at gmail.com>
>To: cq-contest at contesting.com
>Subject: Re: [CQ-Contest] [Amps] amplifier in 1960's QST
>Message-ID:
>         <CAG32hyP4upF5Xfz7O=C42si5t54f_JFamRNXF7j90XX0Uy9GDQ at mail.gmail.com>
>Content-Type: text/plain; charset="UTF-8"
>
>WRL had the Galaxy 2000 amplifier that used 10 sweep tubes in it for a KW.
>73
>Tom W7WHY
>
>http://www.eham.net/reviews/detail/1537
>
>On Mon, Dec 4, 2017 at 1:53 PM, <fortra at siol.net> wrote:
>
> > Hi Bill,
> > i do remember seeing an article with 8 to 10 TV horizontal amplifier
> > sweep tubes. They were Philips or Valvo, or Siemens, marked
> > as PL519, PL509 and not sure PL505. There were also line of EL519
> > but, faintly they did not fit the drawing due to heating.
> >
> > The PL519 were either designed for 24 Volts or similar voltage, thus
> > they used quite some number of them.
> >
> > It was published in our Radioamater , same as QST as national amateur radio
> > magazine. And when our "brother ina arms " CBers find that, you have got
> > number of
> > amps...
> > Also, if my memory serves me, there was an article in German CQ-DL thus,
> > play bit
> > with google ans see, if you got any respones...
> >
> > Kind regards Bill,
> >
> > Nermin S58DX
> >
> > -----Izvorno sporo?ilo----- From: Fuqua, Bill L
> > Sent: Monday, December 04, 2017 6:06 PM
> > To: amps at contesting.com
> > Subject: [Amps] amplifier in 1960's QST
> >
> > I have been looking for an article about a suitcase kW amplifier using a
> > load of sweep tubes. directly off power line power supply (voltage
> > multiplier) and a broadband matching network. Not interested in building
> > one because there are all sorts of problems with the idea. I think it was
> > in late 60's but I can't find it. Perhaps it was not QST.
> >
> > Anyone remember it?
> >
> >
> > 73
> >
> > Bill wa4lav
> >
> > _______________________________________________
> > Amps mailing list
> > Amps at contesting.com
> > http://lists.contesting.com/mailman/listinfo/amps
> > _______________________________________________
> > Amps mailing list
> > Amps at contesting.com
> > http://lists.contesting.com/mailman/listinfo/amps
> >
>
>
>------------------------------
>
>Message: 4
>Date: Tue, 05 Dec 2017 09:24:28 -0500
>From: k2ttt <k2ttt at optonline.net>
>To: Tom Osborne <w7why1 at gmail.com>, cq-contest at contesting.com
>Subject: Re: [CQ-Contest] [Amps] amplifier in 1960's QST
>Message-ID: <AF.B9.04056.F1CA62A5 at mta1.srv.hcvlny.cv.net>
>Content-Type: text/plain; charset=utf-8
>
>I had one of those, 10 matched 6hf5 in the final,? great for keeping 
>the coffee hotk2ttt/c6att jay
>-------- Original message --------From: Tom Osborne 
><w7why1 at gmail.com> Date: 12/4/17  5:01 PM  (GMT-05:00) To: 
>cq-contest at contesting.com Subject: Re: [CQ-Contest] [Amps] amplifier 
>in 1960's QST
>WRL had the Galaxy 2000 amplifier that used 10 sweep tubes in it for a KW.
>73
>Tom W7WHY
>
>http://www.eham.net/reviews/detail/1537
>
>On Mon, Dec 4, 2017 at 1:53 PM, <fortra at siol.net> wrote:
>
> > Hi Bill,
> > i do remember seeing an article with 8 to 10 TV horizontal amplifier
> > sweep tubes. They were Philips or Valvo, or Siemens, marked
> > as PL519, PL509 and not sure PL505. There were also line of EL519
> > but, faintly they did not fit the drawing due to heating.
> >
> > The PL519 were either designed for 24 Volts or similar voltage, thus
> > they used quite some number of them.
> >
> > It was published in our Radioamater , same as QST as national amateur radio
> > magazine. And when our "brother ina arms " CBers find that, you have got
> > number of
> > amps...
> > Also, if my memory serves me, there was an article in German CQ-DL thus,
> > play bit
> > with google ans see, if you got any respones...
> >
> > Kind regards Bill,
> >
> > Nermin S58DX
> >
> > -----Izvorno sporo?ilo----- From: Fuqua, Bill L
> > Sent: Monday, December 04, 2017 6:06 PM
> > To: amps at contesting.com
> > Subject: [Amps] amplifier in 1960's QST
> >
> > I have been looking for an article about a suitcase kW amplifier using a
> > load of sweep tubes. directly off power line power supply (voltage
> > multiplier) and a broadband matching network. Not interested in building
> > one because there are all sorts of problems with the idea. I think it was
> > in late 60's but I can't find it. Perhaps it was not QST.
> >
> > Anyone remember it?
> >
> >
> > 73
> >
> > Bill wa4lav
> >
> > _______________________________________________
> > Amps mailing list
> > Amps at contesting.com
> > http://lists.contesting.com/mailman/listinfo/amps