Quote from: Enzo on December 09, 2013, 05:46:27 PM
Um... I did post the schematic a couple posts up.

Hi everyone, I do not start a new topic as I would like to mention an idea of mine about a mod of this particular amp (G30R CD) here.
I am thinking about adding a real power amp to it, and I have 2 ideas:
1. To lift the C40 cap going to pin1 (input of power amp chip) and sent it to the grid of an ECC83 phase splitter tube driving a pair of EL34's, the standard Marshall power amp section, JTM 45 and the like.
2. Do not modify anything inside, just remove the speaker cables and sent them to the 8 Ohms side of a small push pull output transformer, and the 10K+10K directly to the grids of a nice big tube pair. The center (ex HV tap) can get the appropriate bias voltage.
So only 2 output tubes will be added, chosen from a very long list like 6V6 6L6 EL84/34/509 6146 GU50 KT... going even up to an 811!
I would give a try to a 600 Ohms/10K+10K interstage transformer as well, but maybe the TDA chip is too powerful for this.
Any comments?