Before I go into detail about the problem, here's a little background. I was so happy to find this Dynacord Da 20 amplifier going for around 100€. It was just about working but didn’t sound at all healthy. I considered myself lucky to find the amp without the cabinet as , in my opinion the DA 20 combo did not have the flair and charm of the earlier DA16. The actual amplifier being almost identical.> Media Information Received_262704978523728 by Dr Derek posted Jan 10, 2021 at 11:23 AM I replaced all the electrolytics and all the coupling caps (two at a time, testing in between) and slowly the amp came back to life. One of the EL 84 s had a plate pin missing so I guess it was working on one valve when I first tested it. Replaced both output valves. It now sounds quite nice although I feel it should have more power for an 18w push pull amp. Anyway, to get to this strange thing of the high voltage which is on one side of the O/P transformer. All the voltages are correct according to the schematic except for the plate voltage on valve 7. The B+ is 365v , the plate on valve 6 is about 361v but the voltage on valve 7 is up around 370v.. The resistance on this side of the transformer measures 138 ohm , a lot higher than on the other side (v6) which is 104 ohm. Cathode voltages and resistors are almost identical and Ok. I have googled this problem but nowhere can I find that the plate voltage is higher than the B+. I can only imagine that it could be caused by induction on the one side of the o/p transformer. Another thing, this doesn't happen everytime I turn the amp on. Sometimes it decides to act completely normal, despite me tapping all over to try and get it to misbehave. I think I have uploaded a schematic below. (The tremelo connection to the cathode of v7 has was disconnected when I received the amp and is still disconnected, , read somewhere that this can be quite hard on the output valve,,,the tremelo now works solely on the screen of valve 5, as far as I can see.) Any theories anyone.?