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Re: Feedback [message #8233 is a reply to message #8231]

Wed, 09 June 2004 19:45

SET lover
Messages: 3
Registered: May 2009

Esquire

I think we're in agreement but I'd still have to say that SET is my personal preference.

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Re: Feedback [message #8234 is a reply to message #8230]

Wed, 09 June 2004 19:51

SET lover
Messages: 3
Registered: May 2009

Esquire

As Wayne said, with SET amps you have a single driver and with PP amps you have a "push" side and a "pull" side. That means there can (and must) be some differences in the two sides and you also have the complexity of phase splitting. The input signal must be reversed to send to the "pull" side to make it opposite to the "push". A SET amp is more pure.

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Re: Feedback [message #8235 is a reply to message #8232]

Wed, 09 June 2004 22:38

Manualblock
Messages: 4973
Registered: May 2009

Illuminati (13th Degree)

So if I understand correctly we are back to square one with SET's where the output impedance of the amp is subject to wildly fluctuating load impedances that are frequency derived and reflected back to the plate of the triode tube?

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SET output impedance [message #8236 is a reply to message #8235]

Thu, 10 June 2004 01:17

Wayne Parham
Messages: 18793
Registered: January 2001

Illuminati (33rd Degree)

They are sensitive to load impedance, that is true. The parallel feed configuration seems a little less so, perhaps since the transformer is resonated with the parafeed cap down low. Then again, I suppose a big output transformer can be used on a standard configuration to drop output impedance and make the system less sensitive. There have been some pretty substantive discussions about output transformers on this very subject. I guess that's probably the most important thing, maybe even more so than the output tube.

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Re: And an even more indepth article [message #8263 is a reply to message #8222]

Tue, 15 June 2004 13:30

akhilesh
Messages: 1275
Registered: May 2009

Illuminati (3rd Degree)

YEah you may be right! About the clippping i mean.
The ASUSA is doing really great. I put in an old RCA 12ax7, and a pair of new tesla el84s. After about 20 hours, it rocks. In my opinion it sounds better than the zen by a tad. Better soundstage and imaging. The zen sounds kind of like there is a film on the music.. i suspect becuase the asusa is tweaked wuth high quality coupling caps and a solen cap in the power supply, while the zen is stock (solen coupling caps which are not too bad thuogh).
I really like the asusa amp!

The one good thing... i no longer think the zen amp is the best amp!
MAde me break that slavish mindset!
-akhilesh

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