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Stee 27th August 2008 09:13 AM

Hi End Tube Project
2 Attachment(s)
see my project with 6C33C and old Push-Pull
better then this:confused:

ErikdeBest 27th August 2008 09:38 AM

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

Yvesm 27th August 2008 10:08 AM

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 ?


Stee 27th August 2008 03:17 PM

I thought at one stage push pull that was not the SRPP

ErikdeBest 27th August 2008 03:26 PM

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.


Stee 27th August 2008 03:58 PM

Thanks a lot
like japan style

Miles Prower 27th August 2008 09:14 PM

No, just no. PP 6V6s can give you about 12W. Why waste that for 4.5W from that final? Other objections seconded.

Stee 28th August 2008 01:06 PM

at last need two final
best escalation is ECC82 - 6V6 - 6C33C all in push pull (six/ch)

Jeb-D. 29th August 2008 04:29 PM


Why are you using an output stage to drive another output stage?

Stee 29th August 2008 07:03 PM

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

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