UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Heathkit S-99 distortion after operation

snowman_al · 23rd Jun 2022, 4:26 pm

Both channels?
Pre-amp or power amp? Feed a signal to the 'tape record' sockets, that eliminates the pre-amp section. If you still get distortion look into the power amp. If it works okay look into the pre...

Measured any voltages yet? Start with the HT and see if it drops after a time. If it is the power amp monitor the cathode volts on the ECL86s (pin 7), do they change?
Alan

23rd Jun 2022, 4:26 pm	#2
snowman_al Octode Join Date: Dec 2018 Location: Llandeilo, West Wales, UK. Posts: 1,092	Re: Heathkit S-99 distortion after operation Both channels? Pre-amp or power amp? Feed a signal to the 'tape record' sockets, that eliminates the pre-amp section. If you still get distortion look into the power amp. If it works okay look into the pre... Measured any voltages yet? Start with the HT and see if it drops after a time. If it is the power amp monitor the cathode volts on the ECL86s (pin 7), do they change? Alan __________________ Never Leave Well Enough Alone...