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vinnie ... Look at the Seth 2A3 design ...

99.5.232.186

drummerwill

In Reply to: RE: good push pull 2A3 design schematic posted by vinnie2 on September 18, 2017 at 04:43:42

Chip647 showed the schematic in his post to this thread.
I built 4 PP45/2A3 stereo amps, one using a Para-feed E-P choke ,like as shown in the Seth 2A3 design ....another PP45/2A3 stereo amp used a small Edcor inter-stage to couple the input to PP outputs.... and another PP45/2A3 stereo amp that used E-P Inter-stages.
Of the 4 ,all of which have new homes, the one with the E-P iknter-stages sound best
I still own a Stereo PP45/2A3 with custom iron amp and a pair of Wurlitzer PP45 mono-blocks with custom iron also.
...........Last word PPDHT is very good , but there's magic in SETDHT done right !
Willie

Edits: 09/18/17

Follow Ups:

RE: vinnie ... Look at the Seth 2A3 design ... - vinnie2 13:00:53 09/18/17 (3)
Done done it , Willie, it is one I am considering. Thanks.
- RE: vinnie ... Look at the Seth 2A3 design ... - PakProtector 11:44:45 09/19/17 (2)
  I know a pair you can probably acquire. They got replaced by a pair of E-Linear 807 monoblocks...:)
  cheers,
  Douglas
  Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
  - RE: vinnie ... Look at the Seth 2A3 design ... - rage 12:34:49 09/19/17 (1)
    It would be a lot of fun to A-B the Seth 2a3 against an E-linear 807 amplifier.
    - RE: vinnie ... Look at the Seth 2A3 design ... - PakProtector 06:42:08 09/20/17 (0)
      It was not as much fun as you might think...LOL As far as the comparison went it was a bit of a 'WOW' for both of us. Seth went back in a few times and we sat there giggling about how those old pentodes were so much cleaner and clear-er than the 2A3's.
      
      Was wishing I had a grid choke for the finals, just to even out the comparison in terms of parts. The front end was a 6H6/FQP1N50 cascode. FET's on top.
      cheers,
      Douglas
      
      Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.

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