Tubes Asylum

RE: 12SN7 vs. 6BL7

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Freo-1

In Reply to: RE: 12SN7 vs. 6BL7 posted by Triode_Kingdom on August 13, 2023 at 21:16:13

Primarily from aural listening. The change was so noticeable, did not bother to make many measurements.
My buddy had obtained the front end circuit from Gary Dodd.
" Don't look back. Something may be gaining on you"

Satchel Paige

Edits: 08/14/23

Follow Ups:

Measurements or it didn't happen... - Triode_Kingdom 14:21:02 08/14/23 (7)
I've heard this sort of thing way too many times, only to see it shot down later. Differences like this are almost always the result of the builder hearing what he wants to. Would be interested in seeing the two schematics.
- Can't ask the circuit designer.. - Freo-1 15:00:46 08/14/23 (6)
  Sadly, no longer with us.
  
  Perhaps some of the answers are in the listed thread?
  " Don't look back. Something may be gaining on you"
  
  Satchel Paige
  - https://www.audioasylum.com/cgi/vt.mpl?f=tubes&m=227092&VT=T (Open in New Window)
  - RE: Can't ask the circuit designer.. - Triode_Kingdom 19:19:06 08/14/23 (5)
    Hmmm, I was part of that discussion you linked. Sorry to hear about the designer. You can't post the two schematics?
    - RE: Can't ask the circuit designer.. - sony6060 08:01:47 08/15/23 (4)
      6BL7 looks very linear to me to -20 volts bias. 12SN7 linearity craps out after -10 volts, but very good to -10 volts. Some 6SN7 tubes do not sound that good.
      - 6bl7 - Tre' 13:51:01 08/16/23 (0)
        
        In Reply to: RE: Can't ask the circuit designer.. posted by sony6060 on August 15, 2023 at 08:01:47
        
        How much idle current? At what angle is your load line?
        
        Tre'
        Have Fun and Enjoy the Music
        "Still Working the Problem"
      - RE: Can't ask the circuit designer.. - Tre' 13:42:14 08/16/23 (2)
        
        In Reply to: RE: Can't ask the circuit designer.. posted by sony6060 on August 15, 2023 at 08:01:47
        
        Assuming constant current (high load impedance, a horizontal load line) it looks pretty linear to me well beyond -10.
        
        It looks like a 16 volt peak to peak grid signal will drive the plate voltage 162 volt below idle and 162 volts above idle. You can't get any more linear than that.
        
        Sorry, I can't draw a straight line.
        
        Tre'
        Have Fun and Enjoy the Music
        "Still Working the Problem"
        
        RE: Can't ask the circuit designer.. - sony6060 02:53:21 08/17/23 (1)
        
        In Reply to: RE: Can't ask the circuit designer.. posted by Tre' on August 16, 2023 at 13:42:14
        
        Tre, on first plate curve what tube is it? No tube is shown on that plate curve like your second plate curve post.
        
        RE: Can't ask the circuit designer.. - Tre' 12:24:19 08/18/23 (0)
        
        In Reply to: RE: Can't ask the circuit designer.. posted by sony6060 on August 17, 2023 at 02:53:21
        
        6sn7/12sn7
        
        Tre'
        Have Fun and Enjoy the Music
        "Still Working the Problem"

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