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Page 75
Section 9
Power On and Testing
When you are ready to test your amplifier you can install the fuse into position in the IEC
socket, then power on the unit. If the fuse does not blow then you can go ahead and check the 5
test points on the PCB using your multimeter.
If the fuse blows then contact us immediately!
Just a reminder to please be aware of proper electrical safety.
There are sufficient voltages in this kit to give you a very nasty and harmful shock, so be
careful when powering on, debugging, and probing around.
TP1, TP2, TP3, and TP4 are located between the Mundorf black capacitors.
If you measure 10-12V DC on the cathode of each output tube (test points TP1, TP2, TP3, and
TP4) this tells us that all the tubes are operating correctly. If they are very close in value to
each other it means the tubes are well matched.
Check the TP5 test point which is located near the AV6V3 position. This is the HT (High
Voltage) and will be in the 320-340V DC range.
If your voltages are all correct then things are looking good. Let's do some finishing touches
and then try out your amplifier on some speakers, preferably a test set of speakers.