Here's where DiscoVlad stole the idea for the MC14506 replacement.
https://forum.sunnstillshines.online/index.php?topic=6864.msg29374#msg29374
https://forum.sunnstillshines.online/index.php?topic=6864.msg29374#msg29374
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Show posts MenuQuote from: gbono on March 31, 2021, 12:07:28 AM
One side of R316 is at 83V and between R316/7 I get 43V but on the other side of R317 it's sitting at 4V. I have lifted one side of CR308 (zener) which doesn't change voltage at node - what is dropping the voltage? All measurements referenced to minus terminal on C403.
Quote from: gbono on March 30, 2021, 05:43:29 PM
Voltages around Q303 are:
VC=4.3
VE=1.9
VB=2.6
I'm still seeing LT 3V at C404.
Quote from: gbono on March 29, 2021, 02:07:40 PM
Rechecked voltages around Q303
VC=1.9
VE=.18
VB=0
I have replaced this transistor several times with 2N3440...
Quote from: gbono on March 29, 2021, 02:07:40 PM
Voltages around Q204
VC=4.37
VE=1.9
VB=2.67