Designed 12AT7 Long Tail Pair phase inverter - half of it doesn't work right - Page 2 - diyAudio
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Old 13th September 2012, 05:43 AM   #11
Struth is offline Struth  Canada
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Join Date: Aug 2012
Location: books at londonpower.com
Hi Ramble

Your schematic is missing a connection at the top of the 10k.

Later splitters with 12AT7 have 47k plate loads, but the T works better than an X in either circuit providing the most clean output.

The original quiescent point selected by Jule is way too low. You have to acommodate the internal plate resistance which effectively reduces the potential signal swing. The tube cannot pull its plate all the way down to its cathode, like a BJT or mosfet can for their respective high-current paths, so the idle voltage has to be set to about two-thirds B+ for a symmetric output. This can be adjust by tweaking the cathode bias resistor.

Have fun
Kevin O'Connor
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