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 potentiometer 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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