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F5 Turbo Builders Thread
F5 Turbo Builders Thread
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Old 9th October 2017, 07:20 AM   #4861
vemsom is offline vemsom  Sweden
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F5 Turbo Builders Thread
Quote:
Originally Posted by Zen Mod View Post
nope , just leave it in mid position

confirm that with ohmmeter prior to soldering it on pcb
It's in the middle position since the build, but still the P3 was put there for the purpose of choice, wasn't it? Both Pass and other build guides wright about using it for tweaking and perfecting the amp by taste.

Is there anyone who know how to set it and could give me a actual guidance other than leave it as it is (I'm aware of that the middle point might be where I end up at the end).
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Old 9th October 2017, 07:21 AM   #4862
vemsom is offline vemsom  Sweden
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F5 Turbo Builders Thread
Quote:
Originally Posted by neno70 View Post
x F5 turbo v2, example Psu just one x the way the channels ?? thank you
Thats enough for both channels, use a transformer with minimum 600VA rating.
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Old 9th October 2017, 07:50 AM   #4863
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Originally Posted by vemsom View Post
Thats enough for both channels, use a transformer with minimum 600VA rating.
thank you
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Old 9th October 2017, 08:12 AM   #4864
ColinA123 is offline ColinA123  United Kingdom
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Quote:
Originally Posted by vemsom View Post
It's in the middle position since the build, but still the P3 was put there for the purpose of choice, wasn't it? Both Pass and other build guides wright about using it for tweaking and perfecting the amp by taste.

Is there anyone who know how to set it and could give me a actual guidance other than leave it as it is (I'm aware of that the middle point might be where I end up at the end).
Either,
You have sophisticated distortion analysing equipment, and you set the harmonics to your "ideal" value.
Or,
You tweak it and use the Mk.1 ear to pick your favourite position.

Alternatively you set it to mid point and leave it alone.
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Old 9th October 2017, 08:25 AM   #4865
vemsom is offline vemsom  Sweden
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F5 Turbo Builders Thread
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Originally Posted by ColinA123 View Post
Either,
You have sophisticated distortion analysing equipment, and you set the harmonics to your "ideal" value.
Or,
You tweak it and use the Mk.1 ear to pick your favourite position.

Alternatively you set it to mid point and leave it alone.
Sorry for sounding grumpy, but this is another answer without any information.
I already said in my first post that you could listen your way to the right position and know ill be able to do a blind tweaking. No matter what i end up, the distorsion i choose to go for doesn't matter, I still like to know if for ex. clockwise will boost 2nd harmonics.
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Old 9th October 2017, 08:36 AM   #4866
Zen Mod is offline Zen Mod  Serbia
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F5 Turbo Builders Thread
you can hardly get two channels identical only by ear , but you can always try

there is no recipe "turn clockwise 1.3489 turns to get 8.62db of difference....", simply because there are too much variables

satisfied now ?
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Old 9th October 2017, 08:40 AM   #4867
vemsom is offline vemsom  Sweden
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Originally Posted by Zen Mod View Post
you can hardly get two channels identical only by ear , but you can always try

satisfied now ?
Wouldn't x amount of turns in either direction be the same for both channels?

Does it take, like you say around 1 turn in either direction or is it more like 10 turns before any noticeable change comes?

Last edited by vemsom; 9th October 2017 at 08:50 AM.
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Old 9th October 2017, 10:07 AM   #4868
Zen Mod is offline Zen Mod  Serbia
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Originally Posted by Zen Mod View Post
......

there is no recipe ....... simply because there are too much variables..........
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Old 9th October 2017, 12:48 PM   #4869
Dennis Hui is offline Dennis Hui  Canada
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F5 Turbo Builders Thread
6L6 did a video on adjusting P3:

Adjusting P3 - a video
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Old 9th October 2017, 07:33 PM   #4870
vemsom is offline vemsom  Sweden
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Great, and even some instructions on how to set it.
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