[DVBC] The Wonderful World of VFETs

[Ira Josephs]

Uh, thanks Glenn.
  ----- Original Message ----- 
  From: gpdavis2 at comcast.net 
  To: 2ladrews at netreach.net ; dvbc-list at list.dvbc.org 
  Sent: Thursday, May 11, 2006 5:48 PM
  Subject: [DVBC] The Wonderful World of VFETs


  Hi Minh:

  Like you, I have also had some Sony VFET gear. And, like you, refurb'd (good Deoxit clean of everything, Black Gate caps, etc.). I had five B-2 amps until last month. But, they have been so reliable that I sold two of them. Like the Sony, have cleaned, set the bias, recapped with BGs, etc. On the bench they made 155+wpc with under 0.0035% THD+N (the resolution of the analyzer being used). Not too shabby.

  Anyway, there has been considerable discussion on www.audiokarma.org about VFETs of both the Yamaha and Sony variety. Just do a forum search. Most of it is in the Vintage Solid State forum.

  Also, The Vintage Knob has a good treatise on both the VFETs and the various Yamaha and Sony gear that used them. http://www.thevintageknob.org/index.html  Axel Dahl, the owner of The Vintage Knob website, is quite knowledgeable about the VFET gear (he has Sony) and vintage gear in general.

  EchoWars, who posts quite a bit on AudioKarma and is a truly magnificent tech (I'm a former semiconductor process engineer and believe a good tech is worth 100 engineers), knows VFET gear quite well, should you need any help with same. He did my TA-5650 integrated amps as well as my B-2 amps for me.

  Am currently running my B-2 amps with a Yamaha CX-1 preamp. Was their last good preamp without all the digital and video garbage in it. I will eventually change that to the C-2x, when I find one. But, the CX-1 has a decent phono stage and the remote is handy. I am driving a pair of Yamaha's NS-1000M Be dome monitors with mine. A very nice combination.  Would also like to try a Sony TA-E90ES preamp, or better yet, a TA-E88/B. You can read about all this stuff on TVK.

  I have both manuals and a copy of a tech report on the B-2 (from Yamaha) if you need them.

  Enjoy!!

  Glenn


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