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Old 25th August 2008, 11:18 PM   #1
DaveCan is offline DaveCan  Canada
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Default Thoughts on horizontal sweep tubes?

Been looking at the McAlister audio stuff and wondered what people thought or think of his approach?
http://www.mcalisteraudio.com/

A nice review from stereomojo that got me interested http://stereomojo.com/McAlister%20re...ter_review.htm
Dave
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Old 25th August 2008, 11:33 PM   #2
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He is very productive designer, but definitely needs to meet Mr. Fourier.
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Old 25th August 2008, 11:37 PM   #3
DaveCan is offline DaveCan  Canada
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Who's Mr.Fourier? I'm not a amp designer or know how to read a schematic etc, so if I appear diytube amp dumb, it's because I am
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Old 25th August 2008, 11:40 PM   #4
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Not much meat there, mostly marketing material. And a lot of stuff that isn't right, which doesn't inspire confidence.

I do love the notion of a "phase slitter, " though.
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Old 25th August 2008, 11:43 PM   #5
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Quote:
Originally posted by DaveCan
Who's Mr.Fourier? I'm not a amp designer or know how to read a schematic etc, so if I appear diytube amp dumb, it's because I am
Dave
I don't mean schematics that I could not find on the site; I meant his explanations why tubes sound better than transistors.

Edit: also I like his "With cathode biased amplifiers the speed and rise times are much slower"

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Old 25th August 2008, 11:52 PM   #6
DaveCan is offline DaveCan  Canada
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Ok thanks I just thought I'd check and see if people may like the design, or have heard it and maybe agree with the review on the amp etc.. The replacement tubes are kind of pricey, but not as bad as some I've seen... I guess my only quip is only having a one year warranty, it would be nice to see that increased by a lot imo.. Dave
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Old 26th August 2008, 12:15 AM   #7
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Quote:
Originally posted by DaveCan
Ok thanks I just thought I'd check and see if people may like the design, or have heard it and maybe agree with the review on the amp etc.. The replacement tubes are kind of pricey, but not as bad as some I've seen... I guess my only quip is only having a one year warranty, it would be nice to see that increased by a lot imo.. Dave
Heh... Replacement output tubes for my 200W amp go for $2.14 per pair, see AES sale thread.
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Old 26th August 2008, 01:30 AM   #8
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I like this one:

Quote:
"Yes - tube manufacture is not critical to performance due to the circuit design. My only comment would be that some Sylvania sweep tubes have been unstable".
Most people here know how I "test" tubes, especially sweep tubes, and they know which brand I have found consistently capable of the most abuse. If Sylvanias are too unstable for him, that leaves more of them for us!

There is not enough real information there to determine the validity of the claims. Sweep tubes in general are good for audio amps, although some particular types are extremely expensive due to their use in CB amplifiers in the 70's and 80's.
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Old 26th August 2008, 01:43 AM   #9
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Hmmm... Tubes have been unstable? I can't imagine tubes oscillating in their boxes, without voltages applied...
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Old 26th August 2008, 05:17 PM   #10
DaveCan is offline DaveCan  Canada
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Thanks all for your inputs Of all the reviewer type places, I had thought stereomojo to be one of the most straight goods honest places, so thats what peaked my interest, plus the amp is made here on my home turf etc.. Dave
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