Low voltage Tube Schematic

[halojoy]

data

[fdegrove]

Hi,

Thanks for the info Carl but let me tell you upfront that I wouldn't spend a single penny on the ECC86.

The ECC88 family of tubes sound much better under similar conditions.

If you want to go tubes,think of PSU voltages in the order of 200 to 450 VDC for sonic bliss.

Cheers,

\You can't turn a sows' ear into a silk purse.

[Joel]

Yeah, this is the same marketing scheme used by many musician accessory companies here in the US. Almost all of the "tube" microphone preamps aimed at amateurs use 20-30V on the plates of a single 12AX7 to add "tube warmth". This is another way of saying distortion figures approaching 15-20%.

I'd rather have a well-designed solid-state device than one of these "hybrid" pieces of gimmickry.

Unfortunately, a lot of this mythology crosses over into the hi-fi world. We've all seen posters asking how they can add a tube to something to "warm it up".

[halojoy]

Originally posted by Joel
Almost all of the "tube" microphone preamps aimed at amateurs use 20-30V on the plates of a single 12AX7 to add "tube warmth". This is another way of saying distortion figures approaching 15-20%.
I'd rather have a well-designed solid-state device than one of these "hybrid" pieces of gimmickry.

Joel.
Thanks for clarifying this after my posts.
When I say that there are tubes that can be used at 12-30 V,
I do no mean to say it is to prefer.
More of an experiment to see how to hook up tubes.
-----------------------------------------------------------

I have asked other who knows, if I can use these low voltage tubes
for audio. They have said the same thing. There is no point to!
They have been polite/patient not to say:
"You are stupid! or Forget it!

What I have understood, we have to go up to at least
something like 100 volt, to get tubes that work well.
But still they have a hard time to match high voltage tubes
or transistors.

/halo - for better sound he stays Solid State
- until he goes high voltage Tube

[fdegrove]

Hi,

The ECC86/6GM8 is a tube that is specifically design for use in low voltage designs.

It will not even work with much more then 30 V on its' plate.

Whether or not you like the way it sounds will much depend on what you want to use it for.

There are other tubes out there that were designed for this particular use but not all that many.

Obviously the ECC83/12AX7A was never designed with this kind of application in mind.

Cheers,

\Frank,definitely sticking with higher voltage valves.