Tubes Asylum

KT-77s in Dyn ST-70 - what bias points? (picture)

71.218.210.206

I have 4 newer JJ KT-77's my slightly modded Dynaco ST70 (1973) and I have to say the amplifier sounds great. All new caps in PS and driver board. Have others found that a different bias setting than the standard 1.56V is better for these tubes? They do seem to be very HOT at 1.52V.

Nearly all voltages in PS are about 10-12V high (B+, and pins 3&4 on OP tubes). Rectifier is a good GE.

Any advice based on experience welcome. Thanks.

Pete

Follow Ups:

Thanks to responders. Also - PeterI 18:36:00 06/03/08 (2)
- RE: Thanks to responders. Also - corerosin 20:46:59 06/03/08 (0)
- You want to measure the voltage drop across ... - CharleyW 19:23:56 06/03/08 (0)
The stock cathode resistor is 15.6 ohms - Michael Samra 17:47:35 06/03/08 (0)
RE: KT-77s in Dyn ST-70 - what bias points? (picture) - Chris O 12:02:44 06/03/08 (1)
- RE: KT-77s in Dyn ST-70 - what bias points? (picture) - CometCKO 17:16:36 06/03/08 (0)

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