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24.15.32.233
In Reply to: RE: For everyone's info the 12FQ7 is a 12.6v 6CG/FQ7, a far better sounding valve. posted by Timbo in Oz on June 11, 2012 at 15:15:51
Tim, I know what you are saying!
But the supply of 12FQ7 is very limited and will be gone in the not too distant future. I recommend that the tubes be set up to use the 6CG7 since the EH is available and a nice sounding tube. Or the 12BH7 EH.
Follow Ups:
I don't remember 12fq7s being available in big numbers even in peak tube years.Do they really sound that much better with a 12v filament?
When problems become increasingly difficult,we can always rely on our collective knowledge and seek relief.
Mike, I think Jim is saying that the 12FQ7 sounds better than the 12AU7 and can be used without mods where the 12AU7 is being heated with 12.6V, of course assuming the filament supply can provide the extra current the FQ draws. There should be little sonic difference between the 12FQ7 and 6CG7/6FQ7. True, Jim?
True - but a BIG difference in availability. That was my point. 12FQ7s are old stock only, and that supply never was all that large.
I didn't think the supply was all that large.
When problems become increasingly difficult,we can always rely on our collective knowledge and seek relief.
Has been my experience that lower voltage on filament translates to lower potential for hum.
All things considered.
The Mind has No Firewall~ U.S. Army War College.
Thats been my experience also.
When problems become increasingly difficult,we can always rely on our collective knowledge and seek relief.
a quieter tube.
The Elaborate DAC=Johnny's Balloon Meshplate 27 Balanced Preamp=Balanced Six Pacs=Newform Research 645
iRiver H140/MB Balanced dac/amp/Ultrasone Ed. 9/JH13 Pro IEM's
see images at: www.pbase.com/jamato8
John
Do you mean with an above ground DC source tied to the filaments? That is the best way I have seen to reduce troublesome hum.
When problems become increasingly difficult,we can always rely on our collective knowledge and seek relief.
you are good to go.
The Elaborate DAC=Johnny's Balloon Meshplate 27 Balanced Preamp=Balanced Six Pacs=Newform Research 645
iRiver H140/MB Balanced dac/amp/Ultrasone Ed. 9/JH13 Pro IEM's
see images at: www.pbase.com/jamato8
On some phono stages I have gone up to 90vdc tied thru a pair of 100k resistors.
When problems become increasingly difficult,we can always rely on our collective knowledge and seek relief.
the problem. On my dac I built, I set the tubes to around 60 volts above ground. Worked very well and the analog stage is very quiet. You gotta love tubes.
The Elaborate DAC=Johnny's Balloon Meshplate 27 Balanced Preamp=Balanced Six Pacs=Newform Research 645
iRiver H140/MB Balanced dac/amp/Ultrasone Ed. 9/JH13 Pro IEM's
see images at: www.pbase.com/jamato8
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