SET Asylum

RE: Ultralinear patent

75.168.134.127

Ralph

In Reply to: RE: Ultralinear patent posted by Tre' on September 15, 2023 at 14:39:39

https://www.oestex.com/tubes/ul.html

I thought the link below of special interest as its a single-ended application.
https://www.diyaudio.com/community/threads/singled-ended-ult (Open in New Window)

Follow Ups:

these UL curves, from your link, are the same as the ones I posted. - Tre' 09:35:55 09/28/23 (1)
and they are still not linear or triode like.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
- RE: these UL curves, from your link, are the same as the ones I posted. - Ralph 09:57:51 09/28/23 (0)
  Yes (I'd have replied sooner but have had my hands full recently). Once you get the plate voltage high enough, the curves look pretty decent. It seems as if you were careful and didn't get greedy, you could avoid that squiggly bit on the left easily enough.
  
  Something else that might make this a fun little project: Norman Crowhurst pointed out a problem with how feedback is applied in tube amps, yet over the last 65 years or so since I've not seen anyone (except us, apparently) do anything about it. The problem is non-linearity at the feedback node (the cathode of an input tube) causing the feedback signal be distorted before it can mix with the incoming signal. This has led to feedback having a bad rap in the high end audio world. The solution is fairly easy though- mix the feedback with the input signal before it hits the tube. IOW on the grid, using a divider network, like the way opamps do it.
  
  Then you could put a bit of feedback on the circuit with a number of benefits and take advantage of the fact that the tube is easy to drive by comparison to a DHT, allowing the circuit to be simple. Two tubes would be enough to do it.
RE: Ultralinear patent - grindstone 20:13:30 09/27/23 (0)
Thanks for that--I had forgotten all about Mr. Grimwood for years and years and it was good to see he apparently has been updating over time.

(Thought I?) recalled Patrick Turner doing a pile of work on those things and lost hours diving usenet posts and archives of his website only to achieve full-bleery.

Seems as though the OP has proceeded in a parallel thread of the same subject line at AK...

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