| Re: 300bPP amps [message #9422 is a reply to message #9416] |
Sun, 18 December 2005 20:06   |
PakProtector
Messages: 935
Registered: May 2009
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Illuminati (2nd Degree) |
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Hey-Hey!!!,
While I might have done the front end a bit differently, simple is good. Did you need to DC the 6SN7's heater? I have run 6SL7>6SN7>Finals and used AC heaters w/o hum. Just curious, as another part of the eq'n is that feeding a big cap input DC filter has usually made some other noise. I've played with the phase splitter autoformer. I always go back to the balanced drive version with the LTP doing the phase splitting and a high leakage L choke. Maybe a better phase splitting choke is the key...:) If multi-grid tubes didn't keep me so entertained, I'd go and try a PP DHT amp. Cathode driven...:) PP 6CK4>2A3>IT>845 maybe not-so-simple can be good too.
cheers,
Douglas
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| Re: 300bPP amps [message #9423 is a reply to message #9422] |
Sun, 18 December 2005 23:10 |
Tre'
Messages: 34
Registered: May 2009
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Baron |
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I probably don't need the DC filament. Force of habit. When I built my preamp with the outboard power supply and the DC filaments. I guess I just stayed in that same mode building the front and it's outboard power supply. I should try AC. Thanks for looking....Tre'
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| Last picture [message #9433 is a reply to message #9412] |
Tue, 20 December 2005 16:50 |
Tre'
Messages: 34
Registered: May 2009
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Baron |
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I needed something to set the amps on. I had the fake marble so I got some 2x2s ....... Tre'
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| Re: typeO [message #9476 is a reply to message #9424] |
Tue, 03 January 2006 19:21 |
PakProtector
Messages: 935
Registered: May 2009
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Illuminati (2nd Degree) |
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Sometimes it's hard to sidestep quiet habits. I was laying out a pre, and in my haste decided to wire up the 5687 cathode follower faux pentode with AC heaters. The parts truck was late delivering my late-ordered parts for the DC supply, and I was impatient. I was quite suprised when it was quiet on AC. That's a first for a 5687 pre for me.
cheers,
Douglas
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