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Old 18th January 2013, 03:08 AM   #21
AJT is offline AJT  Philippines
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Quote:
Originally Posted by scott17 View Post
I, for one, would like to know more about an FET source follower driving 6GK6 (actually 10GK6) output tubes using the triode of a 6GH8 in a cathodyne configuration. Is this worthwhile?
i have used the 6GK6 in a classA pushpull amp in a circuit intended for the 6BQ5, and i can definitely say that the 6GK6 had nothing to be shy about....

a 6GH8 with the pentode operated as triode and concertina is a good setup, although in my amp i used a 12AT7....
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Old 18th January 2013, 04:43 AM   #22
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cool... I'm working on a push pull with LED cathode bias for both the driver and the power tubes (not the concertina) ala syclotron.

I'm still interested in whether an FET cathode follower would be beneficial for the contertina drive section.

I sourced high current LEDs for the power tube section...I think I've found the right ones. Will do testing.

The plan is to reduce the LED count down to about 9 per power tube section as opposed to 42 as used in the syclotron.

I should have them tomorrow.. we'll see what happens.

Thanks,

Scott

Quote:
Originally Posted by Tony View Post
i have used the 6GK6 in a classA pushpull amp in a circuit intended for the 6BQ5, and i can definitely say that the 6GK6 had nothing to be shy about....

a 6GH8 with the pentode operated as triode and concertina is a good setup, although in my amp i used a 12AT7....

Last edited by scott17; 18th January 2013 at 04:48 AM. Reason: spelling
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