Modified 6C33C

dannydanger · 27th September 2010, 06:33 PM

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?

Jeb-D. · 27th September 2010, 09:26 PM

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 · 28th September 2010, 01:05 PM

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.

27th September 2010, 06:33 PM	#1
dannydanger diyAudio Member Join Date: Oct 2009 Location: Nashville TN	Modified 6C33C 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?

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27th September 2010, 09:26 PM	#2
Jeb-D. diyAudio Member Join Date: Nov 2005 Location: SoCal	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.

28th September 2010, 01:05 PM	#3
dannydanger diyAudio Member Join Date: Oct 2009 Location: Nashville TN	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.

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