Hi,
I am new to this board and I came here to gain your help for a problem that I am having with an ST 70 with a Vta board. The left channel has incorrect nominal voltages. The voltage measured are as follows. (The measurements were made without any tubes installed other then the 5AR4).
Pin1 = 550Vdc
Pin 2 = 493
Pin 3,8 = 534,546
Pin 6 = 550
Pin 7= 499
R17 and R 15 smoked with the application of power. I have an older VTA board with the orange drop capacitors.
I check for shorts, but I didn't find any. The resistant path from B+ to all the different circuits and their resistance were nominal.
I unloaded the B+ cable and the voltage was somewhat higher(500 volts).
I have met a dead end on all the testing I have done. So now I come here seeking help from savvy and professional techs who are well versed with this amplifier. Any help you can provide will be greatly appreciated
Warren
I am new to this board and I came here to gain your help for a problem that I am having with an ST 70 with a Vta board. The left channel has incorrect nominal voltages. The voltage measured are as follows. (The measurements were made without any tubes installed other then the 5AR4).
Pin1 = 550Vdc
Pin 2 = 493
Pin 3,8 = 534,546
Pin 6 = 550
Pin 7= 499
R17 and R 15 smoked with the application of power. I have an older VTA board with the orange drop capacitors.
I check for shorts, but I didn't find any. The resistant path from B+ to all the different circuits and their resistance were nominal.
I unloaded the B+ cable and the voltage was somewhat higher(500 volts).
I have met a dead end on all the testing I have done. So now I come here seeking help from savvy and professional techs who are well versed with this amplifier. Any help you can provide will be greatly appreciated
Warren