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Old 27th September 2010, 06:33 PM   #1
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Default 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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Old 27th September 2010, 09:26 PM   #2
Jeb-D. is offline Jeb-D.  United States
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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.
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Old 28th September 2010, 01:05 PM   #3
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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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