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Old 14th January 2011, 04:57 PM   #1
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Default Pls Help me, this 6C33C pp Schematic is OK?

hello everyone,
I was planning a DIY 6C33C PP.
this is the circuit I intend to do, but I'm afraid there are some errors in it.
please let me know this circuit is okay?
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Old 14th January 2011, 05:59 PM   #2
SVStube is offline SVStube  Ukraine
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Quote:
Originally Posted by lieukiem View Post
hello everyone,
I was planning a DIY 6C33C PP.
this is the circuit I intend to do, but I'm afraid there are some errors in it.
please let me know this circuit is okay?
1. There is not bias in the grids of 6S33S.
2. An input capacity 6S33S is large, so the plate current of driver tube is necessary to be done more.
3. It is better to do FT3 in 3-4 times more.
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Old 14th January 2011, 06:02 PM   #3
kevinkr is offline kevinkr  United States
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Well a few things that come to mind.

First here is a cap on the cathode tail resistor of the phase splitter that shouldn't be there.

Second I should think the 6H30 would do a much better job driving the 6C33 than a 12BH7. I would want a low impedance and lots of current to drive the grids of a 6C33.. I'd even consider an IT in this application.

Third the 6C33 is best run with cathode bias - if you use fixed bias you will need to delay the B+ until the filaments are fully warmed up to prevent arcing. Operating stability is less of a given with fixed bias with this tube, although I prefer fixed bias in general.

The grid resistors are missing on the output stage.

Not really crazy about this design.
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Last edited by kevinkr; 14th January 2011 at 06:05 PM.
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