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Old 10th March 2010, 08:12 AM   #21
Zoran is offline Zoran  Serbia
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Join Date: Jan 2004
Location: Belgrade
Once I made a little parallel SE amp with 5687 tube
2 tubes, 4 sections per ch.
driver was the I think the 6SN7
I was not bad at all...
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Old 8th May 2010, 05:53 PM   #22
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Location: Oakley, California
On the subject of these tubes, You could get some 6CG7 (9pin 6SN7) and make a sweet amp for cheap. I've got some I'm saving for a push-pull flea-power headphone amp. They sound nice with 10k plate-plate transformers if you run an 8ohm load on the 16ohm tap.
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Old 9th December 2010, 08:25 PM   #23
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Smile 6SN7

[QUOTE=Zoran;1096576]6SN7 is great tube...
I read somewhere that RCA stuff used some laboratory audio SE amplifier 0.7W output power with 6SN7 tube...
I think that was Olson when seting up famos RCA LC1 speaker...
The problem is output transformer, which has to be of very high prmary inductance (internal resistance of the 6SN7 is near 7K).
rough estimations is 250H... Imagine the capacitance...
Anyway, for those who want try tube shows best results at very high anode voltages near maximum of 450V...
For low-power amps maybe the better solution is 1.8W SE 10Y
amp with still demanding but less complex OT...
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Old 10th December 2010, 11:16 PM   #24
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Join Date: Oct 2010
Location: se england
i'm almost done building a ppp 6h8c (6sn7 equiv) amp, six tubes a channel 6k8 ot and an e88cc input / concertina phase splitter similar to the design in morgan jones 10w el84 amp. biggest pain is heating them all, have gone series heater chain with 100w transformer and lm317 reg
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Old 6th March 2011, 11:37 AM   #25
JandG is offline JandG  United States
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Join Date: Jan 2005
Location: Washington State
The PSE 6sn7/6sn7 pictured a page back still has survived after selling a 300B PPamp, SET 45 of high quality, etc, etc. It is in constant use as a bedroom system with ADS 2-way= L690's. I run it direct off my tuner,wide open. Simple PSEwith 10k plate load on front 6sn7's in Parrallel w/ a single 560ohm/220mfd for bias @ 237v B+ w/ 3k 4/8 ohm OT's The parallel 6sn7 outputs have a bias of 1k/220mfd also @ 237v B+. 100k grid leak w/ .25uf coupler. Tubes have been common GE 6sn7 GTB & ran ever night for years now. Has something going for it for sure. I would not build another SET 45. Seems to simple & very non audiophile, but who cares for a near field bedroom system .
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Old 3rd February 2015, 09:22 AM   #26
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Join Date: Mar 2013
Default Low Power 6SN7 Project Circuit

Does a nice job driving headphones and speakers in a small room for casual listening at a decent level. Nice thing about using these low power amps is you can run them for hours and not run up your electric bill, good for background listening. The 6SN7 puts out a nice sound, I ran the prototype built amplifier for several months driving bookshelf speakers.
Driving Speakers With 6SN7 Output Tube
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Old 3rd February 2015, 10:36 AM   #27
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Join Date: Sep 2006
Tom Schlangen's Homepage - Tube DIY Pages

I built this with an old radio OPT. Without the tone circuit it would be a nice Hifi amp. 1 Watt in a large speaker cabinet makes quite some noise.
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