Posted by Tubelcain (A) on January 12, 2018 at 13:04:50

In Reply to: RE: PP 300B direct coupled input/driver as a PP amp? posted by nerdorama on January 11, 2018 at 11:39:59

Hi Nerdorama.
Those Russian GU-50 are still out there for nothing and come with a excellent reputation for sound quality for a IDH Valve/Tube in Triode of course I just had to do something with a pair or two, as I had bought a life time supply!!!

This will be a line integrated amp. It needs to be A cheapy but with a few different ideas.

A Push Pull amp with LL1540 input/splitter > 6E6P-D 200V@25ma > LL1671PP Interstage > GU-50 > LL1682PP Output 400V@100ma. Fixed bias using Tentlabs Bias supply.

PSU. Custom Toroidal > Scotty Bridge > 6CM3 Damper Diode > Tentlabs E-chokes > Polypropylene Motor Run Caps for smoothing.

6GF7a series Pass regulator for the driver HT.

Extensive common mode filtering for the AC valve/Tube Filaments/Heaters.

Hope that helps, how are you planning to build your GU-50 amp?

Tubelcain.