Hello,
I am building an amp based on this power amp and PI:
Linear Conchord 30 & L50 Schematic Diagram
and this preamp:
http://www.blueguitar.org/new/schem/vox/ac30_pre.gif
Sounds good but output is quite low.. voltage at EL34 plates is 320 ish... this seems low, but I am using a choke, whilst the original amp did not.
Also, something smokes when I turn it up. I thought it was the cathode capacitor, but I'm not sure now. It may be the cathode resistors. I used the resistors from the original amp until new ones arrive. Could they go old and smoke? Would an under-rated resistor cause smoke?
Any suggestions would be much appreciated!
Harry
I am building an amp based on this power amp and PI:
Linear Conchord 30 & L50 Schematic Diagram
and this preamp:
http://www.blueguitar.org/new/schem/vox/ac30_pre.gif
Sounds good but output is quite low.. voltage at EL34 plates is 320 ish... this seems low, but I am using a choke, whilst the original amp did not.
Also, something smokes when I turn it up. I thought it was the cathode capacitor, but I'm not sure now. It may be the cathode resistors. I used the resistors from the original amp until new ones arrive. Could they go old and smoke? Would an under-rated resistor cause smoke?
Any suggestions would be much appreciated!
Harry
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