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Old 2nd March 2011, 01:27 AM   #61
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Today I decided to punch more of holes on the chassis: to add 4P1L in parallel, and replace 6N16B in cathode followers by 6J9P.


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Old 2nd March 2011, 03:21 PM   #62
Helmuth is offline Helmuth  Netherlands
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Tube Tester Files - 4P1L
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Old 2nd March 2011, 03:22 PM   #63
TheGimp is offline TheGimp  United States
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Quote:
Originally Posted by Wavebourn View Post
Today I decided to punch more of holes on the chassis: to add 4P1L in parallel, and replace 6N16B in cathode followers by 6J9P.


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Did you triode strap the 6J9Ps?

What cathode resistance?

TKS.
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Old 2nd March 2011, 05:21 PM   #64
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Quote:
Originally Posted by Helmuth View Post
Look for your self
Tube Tester Files - 4P1L
It is half of the story... The full story is to look at curves up to +16 volt on first grid (in one of my previous posts).




Quote:
Originally Posted by TheGimp View Post
Did you triode strap the 6J9Ps?

What cathode resistance?
Everything is the same as in the original schematic, except 6J9P triode strapped instead of 6N16B with both triodes paralleled, plus one more 4P1L in parallel for 5W output per channel.

And output transformer with 2K primary, of course.
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Old 4th March 2011, 07:25 PM   #65
hihopes is offline hihopes  South Africa
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Default Questions re 4p1l PSE

I see some people have experienced some loss of clarity with PSE designs. Have you noticed anything like that with this one? Did you try to match the output pairs at all? Are you happy with the results? I have 10of these on the way and was thinking about trying them in push-pull, but I have also been tempted to try PSE as a simpler option.
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Old 4th March 2011, 08:18 PM   #66
Helmuth is offline Helmuth  Netherlands
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Quote:
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I see some people have experienced some loss of clarity with PSE designs. Have you noticed anything like that with this one? Did you try to match the output pairs at all? Are you happy with the results? I have 10of these on the way and was thinking about trying them in push-pull, but I have also been tempted to try PSE as a simpler option.
Loss of clarity PSE and I just started a PSE design
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Old 5th March 2011, 01:50 AM   #67
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Quote:
Originally Posted by Helmuth View Post
Loss of clarity PSE and I just started a PSE design
I am scared to death too!
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Old 5th March 2011, 11:55 AM   #68
Jaime is offline Jaime  Uruguay
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Default Nonsense

"I see some people have experienced some loss of clarity with PSE designs. Have you noticed anything like that ?"

I have also heard some people say that.
However Hiroyasu Kondo (Audio Note Japan), the famous designer Ongaku, has made several PSE amplifiers:

KSL NEIRO “The NEIRO is an 8-watt stereo amplifier. It uses parallel 2A3 output tubes”.
Kondo - Audio Note

KSL-KEGON 300B “The KSL-KEGON is a 300B based stereo amplifier. All Silver from input to output, It is in parallel single-ended operation with output of 20w per channel.”

You would think that Hiroyasu Kondo was wrong?
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Old 5th March 2011, 01:26 PM   #69
ratbagp is offline ratbagp  United States
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Some years ago there was an article by Norwood Still in Glass Audio or AudioXpress where he paralleled 5 x 12B4A per channel. I tried it out in a slightly different version and decided it was very clear.

To help ensure there wasn't current hogging, I had a cathode resistors on each tube.

So how about 10 x 4P1L per channel?

ray
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Old 5th March 2011, 08:08 PM   #70
hihopes is offline hihopes  South Africa
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Well, scared or not, how does it sound?
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