6922 as a CCS, a question ? - Page 2 - diyAudio
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Old 10th April 2004, 11:57 PM   #11
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Join Date: Apr 2004
Location: Monroe Township, NJ
FWIW, a pentode makes a better current sink than a triode.

Wiring 1/2 a 6922 as a cathode follower and loading it with a CC 6AU6 should accomplish your near unity gain goal nicely. A stack of 3X red LEDs will take care of 6922 biasing needs. Use a B+ rail of approx 175 V. You will set the 6922 Ib to 3.5 mA. Cap. couple the 6922's cathode to the O/P. Wire a 1 MOhm resistor across the O/P RCA jack's terminals.

Use a 1.2 KOhm cathode resistor on the 6AU6. Connect the "legs" of a 1 MOhm pot. between B+ and ground. Connect the wiper of the pot. to the 6AU6's control grid. Connect the 6AU6's screen grid to its plate via a 1 MOhm resistor. Ground the screen grid via a 100 nF. cap. Starting at the grounded end, adjust the wiper of the 1 MOhm pot. to yield a drop of 4.2 V. across the 1.2 KOhm cathode resistor.

Separate floating supplies for the 6922 and 6AU6 heaters are indicated. DC on the 6922 heater would not hurt.
Eli D.
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Old 11th April 2004, 04:43 PM   #12
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Join Date: Apr 2004
Location: Monroe Township, NJ
Don't forget the Carbon composition stopper resistors (1 KOhm grid and 100 Ohm plate) on the 6922, regardless of the topology you settle on. The 6922 is a high gm VHF type and "loves" to oscillate.
Eli D.
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Old 11th April 2004, 07:36 PM   #13
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Join Date: Aug 2002
Location: Eire
Thanks for all the reply's.
I will do some experiments when I get the time. Should be fun to get a simple tube circuit working.

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