Tubes Asylum

RE: For everyone's info the 12FQ7 is a 12.6v 6CG/FQ7, a far better sounding valve.

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In Reply to: RE: For everyone's info the 12FQ7 is a 12.6v 6CG/FQ7, a far better sounding valve. posted by Michael Samra on June 11, 2012 at 21:18:58

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.

Follow Ups:

RE: For everyone's info the 12FQ7 is a 12.6v 6CG/FQ7, a far better sounding valve. - Michael Samra 03:06:06 06/13/12 (0)
Thats been my experience also.
When problems become increasingly difficult,we can always rely on our collective knowledge and seek relief.
Float the filaments and you will have . . . - John PA 22:30:46 06/12/12 (4)
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
- RE: Float the filaments and you will have . . . - Michael Samra 03:53:39 06/13/12 (3)
  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.
  - Yes, something like 50 volts above ground and . . - John PA 13:22:17 06/13/12 (2)
    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
    - RE: Yes, something like 50 volts above ground and . . - Michael Samra 17:09:20 06/13/12 (1)
      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.
      - Well that would hopefully solve. . - John PA 08:58:03 06/14/12 (0)
        
        In Reply to: RE: Yes, something like 50 volts above ground and . . posted by Michael Samra on June 13, 2012 at 17:09:20
        
        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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