Hallo. I have a problem with my ALPHA 77SX amplifier, that i have rebuilde. The probleme is : When i switch the amp on, the meter slowly run to a current from ca. 100mA. I measure - with a external meter - on the kathode from the tubes in this moment 56V. - Ground meter to chassis and plus meter to kathode tube - .The data sheet for the 3CX1500A7 shows, there cannot run 100mA current with 56V on the kathode. I have test this problem with other tubes, it is the same problem. Then it is not a tube problem. A secound problem is, when i switch the amp. relais then on - PTT- , i hear the relais, but the U kathode change not to 18V there are still 56V. Can anybody help me? Please excuse my bad english vy 73 de friedrich dl6aar Email: DL6AAR@t-online.de P.S. I looking also for spare parts for this amp. Electrical or mechanical.