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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Anyone ever put JC's "siren's song" preamp together? posted by vinnie2 on November 16, 2014 at 03:10:28:
A hedonist is a fun seeker. I think this article was written as a lark. I haven't built it or listened to it. I was taught that a difference amp was a noisy amp because of the summing effect of it's cathode connection and the attendant increase of the summed Johnson shot noise. Especially not recommended as the first stage of a very high gain preamp and there are two of them in series. The object it would seem IMHO is to get the gain up out of the noise and then monkey with the EQ. To get good CMMR which is why he is claiming to use two diff amps cascaded one after the other that they would entail quite a bit of tweaking because it's impossible to make both side of the tube that PERFECT. If you test most dual triodes then they vary as to transconductance. I didn't find any balancing measures to null out the imbalance. Just my 2 cents. Moe
"...the fool doth think he is wise but the wise man knows himself to be nothing but a fool." Will Shakespeare
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- I'm not a hedonist... - mobiasloop 08:34:33 11/16/14 (0)
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