6C33C Single End

Однотактный усилитель на 6С33С

Second version, Third version

This amplifier was described in the article (russian), published in the “RadioHobby” magazine, 1/2006.
 

Output transformers of the first version:

First version implementation process:

First version external view:

The first version was very nice, so another two versions were built soon. The main differences are:

• two separate plate power supply transformers. One was too hot.
• driver’s anode voltage was increased to 400v
• output transformer’s primary winding  changes from 800 to 1200, secondary - from 107 to 130, each channel anode capacitors changed from 1mF to 2mF (wit the respect to Yury Makarov, aka “Wizard”)
• microcontroller controlled “Nikitin” volume control and output VU-meters were implemented in the second version
• The “Amplifier Control Module” with InfraRed Remote Control and soft-start was implemented in the third version.

Second version:

Third version: