High Efficiency Speaker Asylum

RE: a lot like Gary Kaufman's --

71.50.30.205

drlowmu

In Reply to: RE: a lot like Gary Kaufman's -- posted by horny on June 21, 2015 at 10:01:00

Its such a shame, with you being in Holland, that we two can't hear each other's Type 45 amps, but you can see the underside of mine.

Would your Type 45 SE amp's underside build look like mine??

Jeff

Follow Ups:

RE: a lot like Gary Kaufman's -- - shane. 01:10:50 07/09/15 (2)
Jeff

When you say two stage amplifier, are you then using an active line stage/pre-amplifier?

You weren't joking about all those caps !!

Best to you,

Shane
- RE: a lot like Gary Kaufman's -- - drlowmu 06:47:34 07/09/15 (1)
  Hi Shane,
  
  No active line stage is wanted or needed with high efficiency speakers, just a simple but HIGHEST QUALITY attenuator. KISS rules.
  
  Lotsa gain in the amp, a mu of 100 driver tube ( half a Telefunken 12AX7 smooth plate, DC coupled to a mu of 4 Type 45's grid ). See the Serious Stereo Web page for info on the technique and his quality attenuator.
  
  Of course I am not joking about the 51 film caps in my stereo two stage DC amp !! They are the minimum I find necessary for highest quality of perceived performance.
  
  No ONE film cap plays "all" the musical ranges ( at the speaker's voice coil ) perfectly, and caps PLAY notoriously narrow band, despite how they may statically measure on a test bench.
  
  We have determined what cap values play best, at differing frequencies, and we can adjust the sound of the amplifier, so it conforms to an " all the music" playback at the speaker voice coil, which is my goal. Its NOT how the amp measures at idle, but rather, how it plays and captures the music dynamically to my ear. Does the amp REALLY perform ?
  
  FEW designers understand this. But Mr. Dennis Fraker does, and he shared the technique with me Shane. What you see ( in that underside picture of mine ) has hardly ever been seen publicly on the WWW before, just one other time as I recall.
  
  Jeff Medwin
  - RE: a lot like Gary Kaufman's -- - shane. 02:18:57 07/22/15 (0)
    Hi Jeff,
    
    Thanks for the reply.
    
    Shane

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