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Dynaco PAT 4 Pre-amp...Why is it bashed?

I also did LTSpice sims and posted some insights at, I think, the Classic Speaker
Pages about 10 years ago but can't seem to find the thread.
I concentrated more on the line stage.
 
stupidly easy to design. So why are they so hard and why have I never come up with a decent one?
(chuckles...) perhaps not complex enough. I have an anti-affinity for anything like simple new fangled kitchen type 'gadgets' to figuring out how to take off a canister/ filter vac. w/o a user manual. i.e. missing the obvious because of lack of complexity.
 
Line stages don't have to do very much and should be stupidly easy to design. So why are they so hard and why have I never come up with a decent one?
Someone here posted one with one 12AU7 per, gain stage DC coupled to cathode follower line drive.
 
Line stages don't have to do very much and should be stupidly easy to design. So why are they so hard and why have I never come up with a decent one?

I was trying to determine how much I could reduce the coupling caps and perhaps go to film types.
There are plenty of good line stages out there.
 
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