I have replaced all caps and out tolerance resistors. I checked all coils and the field coil and output transformer. All checked good. At power up I get a 60 hz hum and no audio. I checked B+ and the output of the 5y4 is only 270v. I checked the plate of the det/ocs and it is also low (180v vs 240v) and the plate of the 2nd det is 0v vice 40v. I started looking at the dc power. I checked the 5y4 in my eico 666 and it is marginal. I don't have a replacement so I made and socket adapter to use a good 5y3. Results only slightly improved. I did some resistance checking and I am confused by the resistance measurement from + of the 8 mfd electrolytic to the - of the same cap. I get ~16K ohms. I have been trying to find the parallel path that would give this result. I removed the tubes during this measurement and that has no effect. I replaced the already replaced 8mfd lytic with no effect. I thought it was the 16k resistor (12), and If I lift one side the resistance goes up to 240k but why? I need a circuit lesson on this. I just don't see how I am getting such a low resistance. I am going to study the schematic some more, but please set me straight.
Andy
Schematic here
Andy
Schematic here
