-Voltage on R1 is not enough, check that you have at least 35 Volts across R1 if the amplifier have a HV voltage of less than 350 Volts, try bybassing Z2 or Z3 (sometimes you have to bypass both), or in cases of a lower HV shunt also Z4.
- If you bypass R6 (with a jumper or a nose plier) and the unit does not switches on, the capacitor is not doing its job. Unless it is defective, I have found that cheap electrolytic caps sometimes need "reforming".
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For Revision A Boards