[GreenKeys] Supply for PP 304TLs ??

Sat, 2 Nov 2002 15:58:54 -0500

Hi Don:

For my 160-M amplifier I couldn't find a good (cheap) plate transformer at
the time, so wound up using a pair of transformers pulled from scrapped
microwave ovens. That outfit works just fine, with the amp putting out 650
watts or so. Since then I came across a nice old Thordarson plate
transformer, free for the taking (as long as I "had to take" some other
stuff to clean out the OT's shack). I've seen a similar one since at the
Hoss Trader's flea market. Asking price was $20.

Vy 73, AI2Q, Alex  .-.-.

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Merz Donald S
Sent: Friday, November 01, 2002 11:59 AM
To: [email protected]; [email protected];
[email protected]; Old Tube Radios
Subject: [GreenKeys] Supply for PP 304TLs ??

By any chance is anyone running an HF amp or transmitter with push-pull
304TL tubes in the final? I have this homebrew here that uses this
configuration. But the power supply it came with is in pieces and it is a
mess. It was modified many times over the years by the builder and has been
patched more than a Microsoft software product.

So this thing needs a filament, screen and HV supplies. I can use some of
the original parts. But for the HV, I don't want to use the original design
because it is built around a 230V pole pig transformer and has lots of
quirky design anomalies that I can live without (Anbody need a 125 pound
pole pig? It'll give you 1700 to 2200 volts all day. The only drawbacks are
that it is huge and weighs a ton).

So I'd like to cheat and see how someone else is powering their rig to get
some ideas.  References to complete designs in any of the popular literature
would be useful too. Can anyone help?

73, Don Merz, N3RHT....

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