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Old 27th August 2008, 09:13 AM   #1
Stee is offline Stee  Italy
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Default Hi End Tube Project

hello
see my project with 6C33C and old Push-Pull
better then this
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Old 27th August 2008, 09:38 AM   #2
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Hi Stee

With my limited knowledge I already see some problems.

A pair of 6V6 in pentode delivers, lets say, 15W into 8 ohms. This is about 10V RMS, which won't drive the 6S33S to full output, as for full output you need rather 50V RMS, or more.

Much care with fixed bias on a 6S33S, it can and has been done, but is not recommended by the manufacturer.

You have global feedback, which does not (always) go well with an interstage transformer. You may experience oscillation...

And then there is the driver stage with the ECC82. It will probably work, but won't do more than that. The ECC82 ain't a good tube, and the choice of the phase splitter is even worse. Expect high distortion from it!

Good luck, Erik
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Old 27th August 2008, 10:08 AM   #3
Yvesm is offline Yvesm  France
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Ciao Stee,

I second Erik.

The basic problem when driving those lo voltage tubes is that you invariably need more B+ for the driver than for the power stage.

You did that ... but lost in the step down IT !

What about a single Hi Gain stage ?

http://www.dissident-audio.com/SE_845/Amp.gif

Yves.
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Old 27th August 2008, 03:17 PM   #4
Stee is offline Stee  Italy
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Default sin

I thought at one stage push pull that was not the SRPP
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Old 27th August 2008, 03:26 PM   #5
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Hi Stee

If you want to go PP in the driver stage you can use a differential amplifier loaded with an interstage transformer. The Raven by Lynn Olson is an example, but you want a 1+1:2 or 1+1:1+1 interstage transformer, and not the step down one used in the Raven.

Still have to look if you will have enough gain, though.

Erik
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Old 27th August 2008, 03:58 PM   #6
Stee is offline Stee  Italy
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Default Thanks a lot

like japan style
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Old 27th August 2008, 09:14 PM   #7
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No, just no. PP 6V6s can give you about 12W. Why waste that for 4.5W from that final? Other objections seconded.
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Old 28th August 2008, 01:06 PM   #8
Stee is offline Stee  Italy
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Default at last need two final

best escalation is ECC82 - 6V6 - 6C33C all in push pull (six/ch)
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Old 29th August 2008, 04:29 PM   #9
Jeb-D. is offline Jeb-D.  United States
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Why are you using an output stage to drive another output stage?
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Old 29th August 2008, 07:03 PM   #10
Stee is offline Stee  Italy
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Default for power and fashion

6C33C have 36W each
low gain (6 - 7 times)
but are suggestive and ideal to exibit
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