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Old 16th November 2012, 09:40 PM   #2831
Zen Mod is offline Zen Mod  Serbia
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you're begging for positive feedback ?

that way is easy to have buzzzzzz ............ and big badabooooom , if you're using sissy speakers

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Old 16th November 2012, 09:43 PM   #2832
lhquam is offline lhquam  United States
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Default Common F6 schematic suggested

I suggest that we agree on a common F6 schematic, including optional parts (like Zen pots) so that we can refer to components unambiguously. The component values do not necessarily need to be shown, only the component identifiers, like R1 and P3.

The main divergence might be in the area of the bias circuits and voltage generators for the input followers.

Any opinions?
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Old 16th November 2012, 09:48 PM   #2833
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Too easy. Have you tried no RS version. I think i remember you did.
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Old 16th November 2012, 11:39 PM   #2834
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Quote:
Originally Posted by lhquam View Post
I suggest that we agree on a common F6 schematic, including optional parts (like Zen pots) so that we can refer to components unambiguously. The component values do not necessarily need to be shown, only the component identifiers, like R1 and P3.

The main divergence might be in the area of the bias circuits and voltage generators for the input followers.

Any opinions?
Can we use the official schematic as a basis for a PCB for the masses? There will alway be others that customize and diverge from the original. Perhaps a base motherboard with daughterboards for options? Too elaborate?

Regards,
Dan
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Old 16th November 2012, 11:48 PM   #2835
lhquam is offline lhquam  United States
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What official schematic? The only schematic from Papa since post #1 (and a later correction) is a photo of the projection screen at BAF. In any case, these schematics do not provide enough common options for DIYers to experiment with.

Quote:
Originally Posted by dantwomey View Post
Can we use the official schematic as a basis for a PCB for the masses? There will alway be others that customize and diverge from the original. Perhaps a base motherboard with daughterboards for options? Too elaborate?

Regards,
Dan
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Old 16th November 2012, 11:58 PM   #2836
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Quote:
Originally Posted by lhquam View Post
What official schematic? The only schematic from Papa since post #1 (and a later correction) is a photo of the projection screen at BAF. In any case, these schematics do not provide enough common options for DIYers to experiment with.
Post 2588 by Nelson Pass

Quote:
Now that the cat's out of the bag via BAF, here is the official F6 schematic.
Regards,
Dan
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Old 16th November 2012, 11:58 PM   #2837
Zen Mod is offline Zen Mod  Serbia
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didn't we put enough variables already ?

perfect tutorial to everyone to make his own drek



Dan - here is da link : F6 Amplifier


and pic :

Click the image to open in full size.
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Last edited by Zen Mod; 17th November 2012 at 12:00 AM.
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Old 17th November 2012, 03:38 AM   #2838
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from generg

"I hope you will like PtP.....!
Do not forget to put an 500R or 1k pot nearby to put it parallel to the upper secondary if you should need some more k2...."

thanks generg - I will be trying it this weekend and then see if I can shorten leads, etc - I want to build on a set of Jensens to compare. I will then re-read the fine tuning info and see what I can do
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Old 17th November 2012, 05:37 AM   #2839
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from generg
"Do not forget to put an 500R or 1k pot nearby to put it parallel to the upper secondary if you should need some more k2...."

I went back and read the zen pot info as well as all I could find on the F5s P3

generg referring to post 2837 - am I correct in saying you are suggesting a 500 or 1k pot across pins 5 and 7 of the transformer

Thanks

Bob
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Old 17th November 2012, 08:40 AM   #2840
generg is offline generg  Germany
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Quote:
Originally Posted by flocchini View Post
from generg
"Do not forget to put an 500R or 1k pot nearby to put it parallel to the upper secondary if you should need some more k2...."

I went back and read the zen pot info as well as all I could find on the F5s P3

generg referring to post 2837 - am I correct in saying you are suggesting a 500 or 1k pot across pins 5 and 7 of the transformer

Thanks

Bob
yes around these values, 500R to 1000R and I recommend you to look at Ihquams experiments with this, he did all months earlier....

and really adding 8-12 db higher k2 than k3 is for me substantial to get the best out of the circuit so the pots are a must for me!
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