One single triode as a PI for rack/stomp tube preamps

[roberto]

Hi all,

During the last days I was wondering about a very simple preamp to be used together with a rack system, including a PI to be more or less saturated.

The first draft design is attached. They are two preamps, one based on a Komet 60 and the other on a Trainwreck Rocket (or AC30, that's not so far).

The last stage of both preamps is half a LTPI, of course with the cathode values doubled being one only triode.

Then the signal is taken from the plate, with a voltage divider and a pot to reduce the gain to a suitable value (to be checked, not even sims done yet), and reduce impedance at the same time.

Has anyone tried something similar (maybe with a more common Marshall 1959 or 2203 preamp)?

Thanks in advance.

[xtian]

The last stage of both preamps is half a LTPI

Huh? Just call it a gain stage, and no one gets hurt.

[roberto]

http://ampgarage.com/forum/viewtopic.ph ... 21#p236190
Nice to see you keep your kind of posts, thanks.

Of course it is a gain stage, but i wrote that to simplify the view of that gain stage as a LTP.