djef
Active Member
I have an MC60 with some baffling problems. It is completely recapped, new diode, metal foil resistors.
The -bias is extremely low. Right after the diode, it is about -140. Then after the first 56k resistor, on both sides, it's about -77. Then finally at the tube, it's only about -7.
Also, when I first turn it on it makes a buzzy oscillating whine. This whine dissipates after 20-30 seconds.
Anyone have any idea what this could be?
The -bias is extremely low. Right after the diode, it is about -140. Then after the first 56k resistor, on both sides, it's about -77. Then finally at the tube, it's only about -7.
Also, when I first turn it on it makes a buzzy oscillating whine. This whine dissipates after 20-30 seconds.
Anyone have any idea what this could be?