Krohn Hite amps, are they any good?

Peter Daniel · 1st May 2003, 02:42 PM

This is one of my few posts in tube section, but I was offered to buy two pairs of Krohn Hite 102 (and 101, I think) amps, with a claim that those are one of the best around. Is that true?

jackinnj · 1st May 2003, 03:11 PM

probably built like a GenRad, HP or Tek. You see their variable filters, oscillators etc., on EBay all the time.

planet10 · 10th May 2003, 08:24 PM

Going by heresay only (but from someone i respect). The lowest measured distortion in a tube amp you are likely to ever find. They sound terrible thou. On the other hand i cooresponded with a fellow in New Zealand who loved his on his IMF TLS80 clones.

dave

Damon Hill · 10th May 2003, 08:35 PM

If these are what I remember them to be, they'll need output
transformers. I think they're really instrumentation amplifiers,
possibly like power opamps.

I >thought< I had a manual or schematics for them, but I can't
turn up anything in my files now.

Carl K · 9th December 2005, 02:43 AM

Hello Peter,I'm in the process of refurbishing a Krohn UF 101a.Did you ever follow up on that offer for the pair of the amps.

kevinkr · 12th December 2005, 04:42 PM

As I recall at least one of these amplifiers was a circlotron design by Dick Burwin. (I was privileged some years ago to work with him on a NMRI switching amplifier design, he claimed this krohn-hite amplifier had the lowest thd of any tube amplifier made, mentioned it had gobs of global feedback.) You might even find schematics for them on the boatanchor site or one of it's mirrors.

Kevin

1st May 2003, 02:42 PM	#1
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Krohn Hite amps, are they any good? This is one of my few posts in tube section, but I was offered to buy two pairs of Krohn Hite 102 (and 101, I think) amps, with a claim that those are one of the best around. Is that true? __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

10th May 2003, 08:24 PM	#3
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Re: Krohn Hite amps, are they any good? Going by heresay only (but from someone i respect). The lowest measured distortion in a tube amp you are likely to ever find. They sound terrible thou. On the other hand i cooresponded with a fellow in New Zealand who loved his on his IMF TLS80 clones. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

9th December 2005, 02:43 AM	#5
Carl K diyAudio Member Join Date: Dec 2005 Location: Ontario	Krohn-Hite UF101 amps Hello Peter,I'm in the process of refurbishing a Krohn UF 101a.Did you ever follow up on that offer for the pair of the amps.

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1st May 2003, 03:11 PM	#2
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	probably built like a GenRad, HP or Tek. You see their variable filters, oscillators etc., on EBay all the time.

10th May 2003, 08:35 PM	#4
Damon Hill diyAudio Member Join Date: Mar 2001 Location: Auburn, WA (somewhere between Seattle and Tacoma) Blog Entries: 1	If these are what I remember them to be, they'll need output transformers. I think they're really instrumentation amplifiers, possibly like power opamps. I >thought< I had a manual or schematics for them, but I can't turn up anything in my files now.

12th December 2005, 04:42 PM	#6
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	As I recall at least one of these amplifiers was a circlotron design by Dick Burwin. (I was privileged some years ago to work with him on a NMRI switching amplifier design, he claimed this krohn-hite amplifier had the lowest thd of any tube amplifier made, mentioned it had gobs of global feedback.) You might even find schematics for them on the boatanchor site or one of it's mirrors. Kevin

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