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Old 17th April 2009, 03:31 AM   #31
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And cathode feedback can produce a Schading effect.
Stand the tube on one of your secondary windings.

Some PushPull will have the 4ohm Grounded. Cause
the common and 16 are actually tied to the cathodes.
Same thing, only different....

Any variance at Cathode looks just like a variance in
the grid, only inverted....
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Old 17th April 2009, 07:11 AM   #32
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Hej Vega65!

The detailed explanation is all in the Schade-paper Svein linked to.

Sveins circuit has a few tiny faults and will not work properly IRL.

If you instead check the 2nd circuit in my post after his I have corrected them to a working one with active components relevant to this thread.

Can mail you the *.asc file together with tube models to play around with. This way you will learn by simming .
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Old 17th April 2009, 10:26 AM   #33
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Quote:
Originally posted by pmillett
Yet another way of getting P-G feedback...

http://www.pmillett.com/uc300b.htm
hey-Hey!!!,
Nice...TX-coupled E-Linear... I will be sure to find that aX issue when you've got your article in it.
cheers,
Douglas
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the Tnuctipun will return
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Old 12th May 2009, 11:29 AM   #34
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Heja Svein,
You where on the right track when you exactly followed Schades original circuit. This is the way to go!

With quite a few tricks and tweaks this will make a nice amp, and why not make it MOSFET?

The 6AQ5 will have less than 1% THD with triode characteristics at 4W. The MOSFET 10W below 1% with 18V B+!
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Old 12th May 2009, 05:46 PM   #35
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Lars,

Are the caps in parallel with the feedback resistors for balancing the
reverse transfer capacitance of the output element?
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Old 12th May 2009, 06:12 PM   #36
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Had to add them by trial-and-error to tame a HF-peak. Have to see what happens IRL when we build them up. The MOS version has now a -3dB at over 100kHz. Can not explain the spiced good result.

Have to order the Hammond 193Us to find out.
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