![]() ![]() I measured TP18 again on the tube socket as opposed to where the cable appears from the hot glue on the PCB (sound good?). Next I wanted to measure the plate voltage to make an estimate of what it should be running at. I have read that the cathode current is about 5~ma or so higher than the plate current - so if my calculations are correct, the measurement I am looking at is around 22.8ma? The schematic shows the measurement at the point where the yellow cable comes out of the PCB but at this point the cable is protected with hot glue, so I took the measurement from where the yellow cable meets the tube socket (is this correct?) it read 27.8mv/ma (assuming this test point has the 1ohm resistor over it to assist the mv to ma conversion?) Last night I took the amp out of the cabinet and took a few measurements.īased on the PRRI schematic, I took measurements at TP16 and TP17 for the cathode current. Also, unless I was to purchase a dual socket probe, this feels like it will be a bit quicker (and I will learn a bit more!) I am VERY careful around these electronics and understand lethal charges etc etc. These items are very hard to come by in Australia.Īlso, while I am aware a good tech should do this etc etc, I would prefer to learn and understand this myself so any help you can give me is appreciated. I am confident with doing this myself and I don't have access to a bias probe or bias meter. I would like to rebias my 65 PRRI myself with my multimeter when I change over my 6v6 power tubes. ![]()
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