[AMRadio] Re: Supply for PP 304TLs ??

[George Pritchard]

Use 3000 Volts max. I use a pair in AB1 Audio. No... I did not pay $85,000
for it! I would not sell it for that either!!! Having to much fun. Anyway,
No screen supply needed since they are triodes. Neutralization is a big
must. For class C, I would use 304THs since the bias requirement is higher,
and will give better efficiency and class C linearity when plate modulated.
They do require plenty of drive however. The TLs versions are more linear
for audio. Use a pair of THs for the class C, and a pair of TLs for the
audio... if you have them. Audio phools are driving the price up on these.
Glad I bought spares years ago! Have fun,
George AB2KC

-----Original Message-----
From: amradio-admin at mailman.qth.net
[mailto:amradio-admin at mailman.qth.net]On Behalf Of Brian Carling
Sent: Friday, November 01, 2002 1:33 PM
To: amradio at mailman.qth.net; glowbugs at piobaire.mines.uidaho.edu
Subject: [AMRadio] Re: Supply for PP 304TLs ??


Here you go DOn.

This outfit sells transformers for building a 304TL amplifier.

You can even buy the complete amplifier kit for $85,000

Hehe - yes guys, that IS $85,000

http://www.alumrocktech.com/prices.shtml

Of course, it's a stereo audiophool amplifier.

Looks like you could get a set of transformers for a mere $14,000 or so.


On 1 Nov 2002 at 11:59, Merz Donald S wrote:

> 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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> AMRadio at mailman.qth.net
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