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-   -   6L6 PP Design Recommendations? (http://www.diyaudio.com/forums/tubes-valves/40647-6l6-pp-design-recommendations.html)

cantskienuf 8th September 2004 11:20 PM

6L6 PP Design Recommendations?
 
2 Attachment(s)
This amp has never quite lived up to expectations. It currently lives on a PCB and I'm thinking of rebuilding it point-to-point. Before doing so, I thought I'd solicit any opinions as to design changes which might improve sonic performance. Thanks in advance.

SY 9th September 2004 12:07 AM

You need more gain out of the first stage- you're in a situation where you've applied very little feedback, which is worse than lots and worse than zero.

If the screens aren't regulated, that could be a major improvement. I assume you actually have B+ on the plates...

Idefixes 9th September 2004 06:25 AM

At the link below you have un highly improved design. It's a Rene Cariou design (one of the famoust french tube amp designer)

The power supply has been little modified by Pascal Tajan (one other french tube fan)

http://membres.lycos.fr/mgautsch/pp6...c%20masses.JPG

Marc

GAK 10th September 2004 07:08 AM

@ Idefixes

How many watts is this amp ?
G2 is higher than Anode??

Idefixes 10th September 2004 07:22 AM

Quote:

Originally posted by GAK
@ Idefixes

How many watts is this amp ?
G2 is higher than Anode??

It has 2x18W. What do you mean with G2?

Marc

GAK 10th September 2004 07:27 AM

G2 :grid 2 from 6L6.
It's rated at 317 V.And Anode is rated at 310V.

Do you have any schem with 6L6 about 30W??

Geek 10th September 2004 08:13 AM

Is what you have a 6L6G or GC? If it's the latter, run your screens at 315V, anode at 500V, bias them AB2 and enjoy 50 watts of pentode power :cool:

For best sound, run ultralinear, AB1 and 420 to 450V. Po is ~26 to 30W.

GAK 10th September 2004 03:24 PM

Hmmmm.....

Sorry for the :clown: question!

resident 11th September 2004 08:44 AM

@Idefixes

Nice schem!

@ Geek

Can I do this without any changes to the schem?
I think NO!
Can you tell me the changes???

Geek 11th September 2004 09:25 AM

You can do AB1 and 420 to 450V with no changes. Just adjust your bias for 25-30% max Pa(idle).


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