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cantskienuf 8th September 2004 11:20 PM

6L6 PP Design Recommendations?
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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)


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


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?


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


Sorry for the :clown: question!

resident 11th September 2004 08:44 AM


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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