GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Audio Discussions
In the Thread: How to get a LOT of SET power.

Post Subject: Multistage considerationsPosted by N-set on: 5/12/2011

Paul, if by error correction you mean frequency correction then I was thinking about +/- the same.

i) Active filters; I have zero experience with crossing-over but people who seem to know what they
are talking about all agree that at ULF active is the way;
ii) If Roman is right, 24db/oct slope with a provision to change to 18db/oct
iii) User adjustable freq. and gain
iv) I would not rely on the OPT 12db natural slope as it's hardly adjustable

That all will give 5 stages if I'm not overlooking some posibility: 3 filtering stages, with the first one bypassable, the driver being
at the same time the last filtering stage and the output with multitapped OPT.

Why not 90W from 833?It's too little power I guess? Then to get those 90W A1 means 2.5-3kV
which is a pain. At 1.5kV one could pile up big Nichicon's, at 3kV...$$$$. Good point about 833 is that
it can handle 450W FAC or even 550W (Pentalabs), and there are 4358757 versions of it, including
the euro TB3/1000. All pretty +/- available (I think the tube is still being used).
Again, 304tl/th is an interesting option with perhaps more power and 2x lower Rp.
Or double all that, consuming 240W heater power per channel...
Approaching this babe from behind, I'm still searching for a propoer output tube.

BTW, I said that my feelings are irrational and irrelevant as it remains unknown what is the proper
implementation. It may as well happen that the hybrid Romy is testing IS the way to go and Bass SET (BSET)
is a waste of time and money and power.

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