6H30 vs. 6922

[Michael]

I keep hearing about the "6H30" tube is this a replacement for 6922 tubes?
I would like to try it in my Audio Research preamp LS2b and PH3.
If any one can help Thank You, Michael

--

Without Music, Life is a journey through a desert.

[L.J. Timpert]

Michael wrote:

> I keep hearing about the "6H30" tube is this a replacement for 6922 tubes?

No absolutely not. It is totally different in almost every aspect. If you plan
to use it, prepare to completely redesign the circuitry associated with that
tube. Also bear in mind that the filament current is much higher than that of
the 6922. You can find data on the 6H30 on http://hfwork3.tn.tudelft.nl/jurgen

Compare these to the data of 6922 and you'll see my point.

>
> I would like to try it in my Audio Research preamp LS2b and PH3.

I don't know about those, but the first thing you should check is the filament
power supply. It should be able to deliver the current the 6H30 draws, a
normal 6922 draws 300 mA compared to the 825 mA of the 6H30. So this is most
likely a problem. Also, when used properly, the 6H30 draws about double the
plate current for proper operation, so make sure the power supply can handle
this or, sadly, it is a no-go situation. But, if the power supply can handle
the doubled load, the gain will still be half of that of the 6922. If those
problems aren't problems for you, then you can carry out the mod.

Jurgen Timpert

[SUSAN LAMEY]

Michael,I don't think it is a direct replacement for the 6922.ARC is using
this tube in the new VT100MK111 but extensive mods.Leonard says it is an
awesome tube.I run the Amperex 7308 in my LS2BMK11.It is the best I have
heard in my pre.
Regards, Kevin
"Michael" <michae...@hotmail.com> wrote in message
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