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MagneQuest/Peerless Forum Welcome! Need support, you got it. Or share your ideas and experiences. |
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MagneQuest/Peerless Forum Welcome! Need support, you got it. Or share your ideas and experiences. |
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In Reply to: Re: 9 Watt Transconductance Amp posted by keto on July 6, 2006 at 07:04:32:
Gary Pimm has done a SS only differential PP version which he thinks sounds better than anything else he has ever done. I still like tubes, they handle the higher voltages a lot easier and you don't need big masssive heatsinks like you do for the SS only version.I've done a differential line level version (my preamp is this design without the tube) which works very well. Going differential causes all kinds of problems though, when you put a CCS on the tail or as a load for a follower the whole thing starts oscillating. It does not like the high impedance load. It turns out that with the very high impedance load any random RF in the environment (even the recovery spike from PS diodes!) sets the things off. Even a fairly high resistive load keeps that away from the gates and its fine. Gary came up with a couple ways to make the circuit less sensitive to this and they seem to work quite nicely. First up the voltage between Q1 and Q2 and second add a small resistor between them. With both these in place a long tail pair works great, no separate phase splitter necessary, it should make a very nice PP amp, I just have not tried it.
John S.
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- Re: 9 Watt Transconductance Amp - John Swenson 16:18:07 07/06/06 (0)
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