Hello Everyone,
The past month i was building the madamp A15MK2 deluxe kit and i was firing it up today to do the voltage measurements and ran into some problems.
First of all V3 is not glowing at all, it recieves the correct heater filament voltage. Also the tubes are not fully in the sockets, the pins are about 0.5 cm higher, is this normal?
At the power supply section of the schematic all voltages are alright, although i can't seem to measure 53 volt at C33+.
At the preamp section i have 266 volt at C17+ and 260 volt at C10+ which seem a little high. However the voltages at pin V2,6 and 1 are lower. 130 and 189 respectively.
Pin 6 of v1 has 230 V, but pin 1 is 151 volt which seems ok. Also pin 2 and 3 of V3 are both around 72 volt.
Can somebody help me with this problem?