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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Read VERY carefully... posted by Steve O on April 4, 2014 at 11:25:31:
Some years ago, perhaps a decade or more, I ran across a significant quantity of Black Plate Triple Mica GE 5751's made in the 50's(as pictured above) packed in large military boxes with tubes packed inside with crinkly brown paper.
I traded a large portion of them with 'Tube World' (exchanged for two NOS/NIB RCA Globe 10's) with the agreement that he would have them CRYOED and send a couple matched pairs back after they were CRYOED and tested for noise.
Long story short, I ended keeping two pair of the original un-CRYOED stock and received back two CRYOED pair such that I could do a direct comparison.
All of the tubes were noise free in my Phono Pre-amp, none were mircrophonic.
This particular 5751 is a great sounding tube and was my favorite as a gain stage in my modified 6550 PP power amp.
OK, perhaps it was not the GREATEST amp in the world but at least very sensitive to tube rolling.
I'd have to say that in this case, the CRYOED tubes won hands down BUT...
I would not argue that CRYOing might also make a BAD sounding tube sound WORSE!
Or make no difference at all.
Also not sure how long the effect lasts, as shortly after this exercise, I built a pair of 300B SET monoblocks and stopped using 'Shitty Little Nine Pin Tubes'in my amps! ;-)
First they came for the dumb-asses
And I did not speak out
Because I was not a dumb-ass
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Follow Ups
- Or does all three, depending on the tube in question... - Ivan303 12:24:14 04/04/14 (1)
- RE: Or does all three, depending on the tube in question... - SETdude 17:24:38 04/04/14 (0)
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