In my efforts to update a TR-4 and early AC-4 supply, I've been working in low voltage areas so far (60 and 250). Just discovered that HV line out of the AC-4 is running approx. 740-744 volts D.C. "unloaded" by the TR-4. The HV line still has original electrolytics. It looks like someone has replaced the rectifier diodes along the way. Now 1N4007s in a bridge arrangement. Does this voltage level sound right? Have not yet measured the voltage under load.
Thanks,
Bill
KG4KKI
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