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Old 10th Dec 2008, 7:18 am   #7
DIN Plug Pete
Tetrode
 
Join Date: Mar 2007
Location: Abingdon, Oxfordshire, UK.
Posts: 66
Default Re: Sound Sales PX4 Amplifier

Hello Alan,

A very nice amplifier, but if it is exactly as your diagram then I think there might have been a wiring error when it was made? I can't understand how V4 could get any audio drive? The anode pin 5 of V3 feeds a 0.1 uF coupling capacitor, which drives V4 pin 3 and also a divider resistor arrangment. The output of this divider is fed straight back into the same triode section (pin 4 of V3). I can't see how any audio drive is applied? In my opinion, the capacitor connections to V3 anodes (pins 2 and 5) should be swapped. Any others agree with me?

Peter.
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