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Old 12th September 2012, 02:03 PM   #41
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Quote:
Originally Posted by Charm View Post
Honestly, the THD figures does not say much about sound quality to put it diplomatically. It would be much more interesting to see how the THD is assembled, K2, K3, K4 etc.
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Old 12th September 2012, 02:05 PM   #42
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Originally Posted by palmas View Post
I've seen that before, and the sound quality does not only depend on how much, but mostly on what kind of distortion.
anyway I'd bet if he pushed the tube towards 20mA the results would have been different.
Exactly!
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Old 13th September 2012, 07:54 AM   #43
mogliaa is offline mogliaa  United Kingdom
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Originally Posted by HornTube View Post
Exactly!
Agree 100%. I just did a simple THD sample test across multiple valves. I never had the time to publish the frequency plots to see what the harmonic distribution looks like. It's just a THD analysis and does not provide any view as to how the valve will sound like.
I think my first test on 6N6P was done about 13-15mA and then tested above 20mA. When I get the tracer up and running again will provide some curves and THD plots for anyone interested in.
Ale
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Old 13th September 2012, 09:00 AM   #44
palmas is offline palmas  Portugal
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Originally Posted by mogliaa View Post
Agree 100%. I just did a simple THD sample test across multiple valves. I never had the time to publish the frequency plots to see what the harmonic distribution looks like. It's just a THD analysis and does not provide any view as to how the valve will sound like.
I think my first test on 6N6P was done about 13-15mA and then tested above 20mA. When I get the tracer up and running again will provide some curves and THD plots for anyone interested in.
Ale
I sure am! tanks for your interest in sharing your hardwork!
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Old 14th September 2012, 03:58 AM   #45
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@mogliaa: Yes, thanks for your effort and your will to share.

P.S.: I'm listening right now to "Three Of A Perfect Pair", the remastered Japan Mini-LP version of course.

Last edited by HornTube; 14th September 2012 at 04:02 AM.
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Old 6th September 2013, 01:38 PM   #46
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Looking here:

http://www.klausmobile.narod.ru/testerfiles/6n6p.htm

In the last graphic I saw something really interesting.
In between 36.9 and 54.5 v for the plate a sudden change in characteristic that told me that I could make a cascode ccs with both the two halves of a 6n6p operating a 55v per triode, 110v in total per cascode at 10ma at -0.5v bias.
.
studying further on graphs I thought that it is possible that with 55-60v on the plate, to have 16ma with 0v bias so both the cathode and grid of the bottom triode to be grounded.
What do you say about it?Am I wrong?
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Old 6th September 2013, 04:45 PM   #47
rongon is offline rongon  United States
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Quote:
Originally Posted by dreamth View Post
Looking here:

http://www.klausmobile.narod.ru/testerfiles/6n6p.htm

In the last graphic I saw something really interesting.
In between 36.9 and 54.5 v for the plate a sudden change in characteristic that told me that I could make a cascode ccs with both the two halves of a 6n6p operating a 55v per triode, 110v in total per cascode at 10ma at -0.5v bias.
.
studying further on graphs I thought that it is possible that with 55-60v on the plate, to have 16ma with 0v bias so both the cathode and grid of the bottom triode to be grounded.
What do you say about it?Am I wrong?

What about grid current due to contact potential? Wouldn't that be a problem with just -0.5Vgk?

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Old 7th September 2013, 12:07 PM   #48
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I do not think that 0v bias is equal to 0.5 v. 0v is for 16ma and 55v on the plate.. What I do not know is what amplitude will let me have that ccs.What I need for this cascode ccs is a cathode follower current stabilization that will make a line output 0.7-2v maximum output swing
The schematic I want to modify is the final stage of Allen Wright s fvp5a
Schematics
If I put 6n6p at 16ma and a total of 220-240v on four tubes in series I obtain 55v per triode .Of couse that I modify the attack for 110v at half of the output stage.
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