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RE: Air Tight ATM-211 schematics

75.82.52.72

Tre'

P

In Reply to: RE: Air Tight ATM-211 schematics posted by Valvulator on July 07, 2012 at 11:55:04

"A front-panel switch turns on the meter, which provides monitoring of the 211 tube's bias voltage; the bias can be adjusted with a trim pot accessible through a hole in the top of the chassis. The first time I used the amplifiers, both meters indicated a slight under-bias (after suitable warmup), which was easily corrected with the trim pot; the bias did not drift during the review period."

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

http://www.stereophile.com/tubepoweramps/687/index.html (Open in New Window)

Follow Ups:

RE: Air Tight ATM-211 schematics - Valvulator 13:59:32 07/07/12 (5)
Its not the external bias trim pot, but an intenal one. Thanks
- RE: Air Tight ATM-211 schematics - Tre' 14:20:54 07/07/12 (4)
  The one in the middle of the picture with the shaft pointing down.
  
  With the black wire going to the filament connection on the bottom left of the output tube and the grey wire going to the filament connection on the output tube top right?
  
  Hum null pot?
  
  Tre'
  
  Have Fun and Enjoy the Music
  "Still Working the Problem"
  - RE: Air Tight ATM-211 schematics - Valvulator 08:48:38 07/08/12 (3)
    Yes, thats it ! what is it for ¿?
    - RE: Air Tight ATM-211 schematics - Tre' 09:54:12 07/08/12 (2)
      Adjust for minimum hum from the speaker.
      
      Tre'
      
      Have Fun and Enjoy the Music
      "Still Working the Problem"
      - RE: Air Tight ATM-211 schematics - Valvulator 13:17:13 07/08/12 (1)
        
        In Reply to: RE: Air Tight ATM-211 schematics posted by Tre' on July 08, 2012 at 09:54:12
        
        This is in case there is a hum, to reduce to minimun... thanks Tre.
        
        Ill still need the schematics because I plan to live with those atm for some decades ;-))
        
        RE: Air Tight ATM-211 schematics - Tre' 14:40:38 07/08/12 (0)
        
        In Reply to: RE: Air Tight ATM-211 schematics posted by Valvulator on July 08, 2012 at 13:17:13
        
        "This is in case there is a hum, to reduce to minimun..."
        This is what I think, I don't know for sure. I read on their website that the filaments are DC so maybe it's a filament voltage adjustment???
        Those are beautiful amplifiers. I don't blame you for planning on keeping them for a long time.
        You should ask Air Tight for info and a schematic. See link.
        Tre'
        Have Fun and Enjoy the Music
        "Still Working the Problem"
        http://www.airtight-anm.com/components/atm211.html (Open in New Window)
        
        Edits: 07/08/12

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