Have any of you measured NKT275s from AM Sunface?

[sockeye]

Hi all,

I have to say, this is an awfully good sounding FF. I had one that I sold and am wishing I had taken some measurements before I sold it.

My question is: has anyone on here taken measurements of Q1 and Q2 from an AM Sunface? Best of all would be if you have gain and leakage measurements from an Atlas DCA. I have a lot of Ge PNPs in appropriate gain ranges, but before I audition them all on the breadboard, I'd like to pull some that measure close to the NKT275s that Mike uses.

thanks in advance,

John

[azrael]

Don't spend too much time looking magic numbers.

IMO, if you get around the right gain range (60-80 for Q1, and 90-110 for Q2) and bias it right, you're 90% there. There are a lot of other things you can do to the circuit to get more drastic tonal improvements/changes to your tastes than searching around for magic transistors.

[petemoore]

  They do what they do...
    Leakage is the big #1 for the transistors, Q1 low-ish gain and lower gain than Q2.
  Part #'s have little to say about how good the parts are for GE FF's etc., the leakage/gain number tell most of the complete story...the rest of the story is hardly worth telling unless you happen to have magic part#'s in transistors with 'actual magic' in them.
   I don't really believe in magic any more. I researched it to where I'm satisfied with the transistors I got, have, use, or can get...just saw 8 fresh-pull Ge's [from my 8 transistor radio !] surface once again, but I've got Ge/Ge/, Ge/Si, Si/Si and another Ge FF here already. Every one of them sounds a little different and I only take mental notes on 'em...bias 'em voice 'em, do maybe something else [fan of the starved/ducktone w/low voltage or nearly dead battery].
   If it's biasing and amplifying [a lot] it 'works'...the rest is up in the air...ten million mods etc.
   No two sound exactly the same and if they did I'd modify one...