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In Reply to: Magnitude. posted by Tom §. on May 30, 2001 at 09:21:28:
I am not even trying to penetrate this market, that is for sure. When I saw the misinformation or maybe outright lies on AA about IDTs, that is when I decided to give factural information.
The hum filling the room can be found on the stereophile review.
The circuitry had to be redesigned to lower the hum which the manufacturer stated he would incorporate. I noticed the postings pertaining to this review were deleted when it went into the archives.
And you mentioned nothing of this hum problem.
The only way you are going to use a DHT in a preamp is if you use DC for the filament and how many parts did you include in this circuit path?? What about microphonics? Were you able to rid of them?
After looking a the schematics, it is very clear how they sound. They were designed to sound that way, "weaken" the bass and highs and the midrange is bound to be prominate with more detail. That is as old as the hills.
But remember Tom, the design of a KT88 is completely different than that for a 300b. So you cannot use a 300b circuit and expect the KT88 to be optimal. Again, frankly, I don't want your business, never did.
Hope this helps.
Follow Ups:
> > The hum filling the room can be found on the stereophile review. < <Well DUH! Why do you keep harping on that?
> > The only way you are going to use a DHT in a preamp is if you use DC for the filament and how many parts did you include in this circuit path?? What about microphonics? < <
Well, there are the shottkey rectifiers, 2 adjustable regulators set up to regulate voltage and a 3rd adjustable regulator to regulate current along with caps to ground between each stage for filtering. If you're trying to use the "less is more" axiom here then you better slow down a bit. All AC signal current in the circuit I built is referenced between the plate, grid, and cathode. The input and output grounds are the cathode of the tube. Think that's as simple AC signal path as possible?
> > After looking a the schematics, it is very clear how they sound. They were designed to sound that way, "weaken" the bass and highs and the midrange is bound to be prominate with more detail. That is as old as the hills. < <
Well, that's a nice ambiguous narrative meant to over-generalize DHT amps.
> > But remember Tom, the design of a KT88 is completely different than that for a 300b. So you cannot use a 300b circuit and expect the KT88 to be optimal. < <
When did I ever say or even imply this? You're doing a bang up job of attempting to interface with things that just aren't there.
You know Steve, one day we may meet in person and probably have a beer and laugh about all this sillyness. Until then, I'd suggest calming down a bit and defocusing on your intent to polarize things.
Tom §.
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