Tubes Asylum

I would guess it is how the cathode is heated and . .

69.244.41.182

John PA

A

In Reply to: RE: I have many and didn't find a lot of difference . . posted by Tre' on June 11, 2012 at 10:00:40

disperses the electrons. I don't know for sure but I have read it often that AC heaters produce better dynamics. I spoke to Dennis once and he felt this, which is why the Six Pac had/has the AC heaters. You could ask Cary I would think.

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

Follow Ups:

RE: I would guess it is how the cathode is heated and . . - Tre' 11:09:53 06/11/12 (3)
6.3 volts AC RMS is another way to say how much AC voltage is required to get the same amount of heat into the cathode as you would with 6.3 volts DC.
RMS, as a way of measuring AC, was invented for that very reason.
A cathode will be heated to the same temp. using 6.3 volts AC RMS as it would for 6.3 volts DC. (BTW, 6.3 volts AC is 17.766 volts peak to peak)
With direct heated tubes (45, 2a3, 300b, etc.) the heater (filament) supply can be part of the signal path and there is good reason to think that the sound might be different between AC and DC heating.
This is where the idea that AC vs. DC makes a difference comes from, but not with in-direct heated tubes.
In-direct heated tubes have no way of telling the difference between AC and DC heating.
Tre'

Have Fun and Enjoy the Music
"Still Working the Problem"

Edits: 06/11/12 06/11/12
- Like I mentioned, ask Cary about this. . - John PA 11:28:35 06/11/12 (2)
  as this is what Dennis mentioned to me as have a few other. I read what you wrote but thee still seems to be a difference of opinion.
  
  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: Like I mentioned, ask Cary about this. . - Tre' 11:42:11 06/11/12 (1)
    I gave no opinions. Only facts.
    
    You have been given mis-information.
    
    Tre'
    Have Fun and Enjoy the Music
    "Still Working the Problem"
    - Might have something to do with migration. . . - John PA 08:51:42 06/12/12 (0)
      that the filament remains more constant with AC. It has been postulated that with DC there is metal migration.
      
      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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