Tube DIY Asylum

"On preamps with a CF the CCS made a major improvement compared to resistor loading."

108.48.193.8

Lew

In Reply to: RE: Would that sound good? posted by Salectric on July 04, 2015 at 14:01:01

Amen to that.

Follow Ups:

RE: "On preamps with a CF the CCS made a major improvement compared to resistor loading." - drlowmu 20:09:12 07/10/15 (2)
Lew,

My co worker, and good audio friend, used to get rid of cathode follower stages, from Audio Research SP3 A-1s, etc, and thought, into a tube amp, with short cables, the deleted stage sounded markedly superior !!

There are commercial products he told me about, it MAY have a C-J preamp series, where the only difference in the later model was an addition of a cathode follower stage, and most everyone prefers the early "simple " edition of the preamp, he tells me. We are referencing to the used market, and posted comments, after several decades of both versions' existence.

I can get the model numbers from him, if you wanna know.

Jeff Medwin
- RE: "On preamps with a CF the CCS made a major improvement compared to resistor loading." - Lew 21:13:24 07/12/15 (1)
  I and Salectric are both agreeing with you, that a "plain Jane" CF, at least all the ones I've heard, does impart an unpleasant coloration that is most evident when you "fix" it, at least a little bit, with a CCS. You can fix it even more, IMO, by adding a constant voltage source on the anode side of the CF, while keeping the CCS. That's the "SLCF" described by Allen Wright. If the interface requires lowering the output Z, a CF with a CCS or an SLCF is pretty darn transparent. However, I would not argue that avoiding the need for a CF is not better than any CF or variant thereof, when possible. Often that is one advantage of an "all-in-one" preamplifier, with phono stage on the same chassis as the linestage. In that case, one can usually dispense with any CF or other output buffer on the phono output.
  - RE: "On preamps with a CF the CCS made a major improvement compared to resistor loading." - drlowmu 06:49:35 07/13/15 (0)
    Well posted !!! Xln't. Thanks Lew.
    
    Jeff Medwin

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