So I helped my son build his first tube amp. It is the 807se I was have talked about. The layout is not as clean as it could be but it is not that bad either. I checked all the solder joints and wiring. The amp sounds really really good and the hum is not even audible unless I put my ear right by the speaker cone. But I don't like it. The tubes are AC heated by twisted wire, center tap is grounded. Nothing special. The only other thing to consider is I let him use a 5H choke in the power supply, should we have used a higher H value?
Thanks
Thanks
let me see...
Well the amp consists of (2) 807 and (2) 6SJ7WGT. The 807's are running at 350V's and the 6SJ7's are around 300V. Current i around 120mA for both channels. The 807's each draw 50mA. I will draw up a power supply schematic right now. I will post it when done. One further note. I made him rewire the filaments will shielded wire and the hum is still there. It does not effect the sound, but I just do like it there,
Well the amp consists of (2) 807 and (2) 6SJ7WGT. The 807's are running at 350V's and the 6SJ7's are around 300V. Current i around 120mA for both channels. The 807's each draw 50mA. I will draw up a power supply schematic right now. I will post it when done. One further note. I made him rewire the filaments will shielded wire and the hum is still there. It does not effect the sound, but I just do like it there,
Link to psu designer..
http://www.duncanamps.com/psud2/index.html
Increasing the 2nd cap to 200uF and upping the choke from 5 to 10 H...brings it round to roughly 20mV.
Cheers,
Bas
http://www.duncanamps.com/psud2/index.html
Increasing the 2nd cap to 200uF and upping the choke from 5 to 10 H...brings it round to roughly 20mV.
Cheers,
Bas
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