Quote:
Originally Posted by Analogdino
Quick update:
Tried a pair of good 5881's, bias optimized, even balanced the cathode currents to around 1.5 mA.
No good!
Max p-p volts across 8 ohms = 40 VAC, 200 Hz.
Thus, power = 25 watts.
Pretty much same as 6L6's, not really surprised.
We soldier on...
Cheers,
Roger
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An intriguing solution to the drive problem can be found in the 6U10 triple triode. Triodes 1 & 3 look like a 12AU7 while triode 2 is similar to 1/2 of 12AX7. All that makes possible a drive cct as used in the Mullard 5-10 & 5-20.
Input gain stage uses triode 2 while the LTP consists of triodes 1 & 3. No need for another hole in the chassis, just enlarge the existing hole to accomadate the duodecar socket.
A much better drive for the 6L6's or whatever.
Cheers, John