Modified 6C33C

[dannydanger]

Here is an attempt at a modified version of Borbely's 6C33C 15W SE circuit. Modified to remove the SRPP and replace it with a grounded cathode input stage, any thoughts?

An externally hosted image should be here but it was not working when we last tested it.

 

[Jeb-D.]

I recommend adding an RC decoupling network for the B+ of the first stage. It will reduce noise (which gets amplified by the following stages) and also reduce intermodulation distortion.

 

[dannydanger]

Thanks Jeb, I think I will do that. I may or may not still keep the 100v filament bias. I think removing the SRPP alleviates part of the need for that but it still may be handy to reduce hum. I may try both ways.