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In Reply to: Can't find an affordable 45-based SET. posted by jeffreybehr on February 3, 2007 at 10:07:24:
Be patient and troll ebay and audiogon. 45 based amps come up all the time in the 400 to 600 dollar range, usually pretty decent DIY efforts, but it might take a while to find them.
I use a Korneff 45 on series strapped Aurum Cantus ribbon tweeters. Crossed over at 3500, the 45 tube is probably just about the best tweeter amp there is, incredible immediacy and tonal character added to the soundfield. 300b's are also excellent, but mostly to render space, they don't have the timbral excellence of the 45's in the same spot. I have never heard a 2A3.
Above 3500, the tweeters use only 10 to 15 percent of the total audio output, so if the tweeters are 90db efficient or above, a couple of watts is overkill.
Follow Ups:
Wait for the 45 it's worth it!If you email me I can provide you with a parts list and a ppt file on a really good 45 amp.
Same as a kit, you just have to buy the parts, which is a good thing as most kits have to skimp on expensive parts to cut costs.
The amp can be built in the $450-$700 range depending on how boutique you want to get with the trans and other stuff.
Simple build, even I could do it, with help of course from a guru!
.
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Tin-eared audiofool and obsessed landscape fotografer.
http://community.webshots.com/user/jeffreybehr
My tweets are the far-less-expensive $30 Daytons, and a month or so ago, I gave up trying to make them sound acceptable and reverted to a single softdome tweeter for a while. But then I learned the B/MR drivers require an at-least-2nd-order LP filter to get rid of their harsh-sounding treble, so I went digital with a dbx DriveRack PA speaker-management system. I'm now using 4th-order L-R filters at 2800Hz for both, and the system sounds MUCH better and in fact very good. I've had this SMS for only a few days, and I'm the kind of audiofool who sometimes needs a week or 3 to determine flaws, so we'll see...or hear.
Based on your comments, I guess I really should wait for a 45-based SET; I'll keep looking.
But I sure am tempted by a pair (= 4 channels) of Music Reference 6EM7/13EM7 amps.
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Tin-eared audiofool and obsessed landscape fotografer.
http://community.webshots.com/user/jeffreybehr
When I started looking for tweeter amps, i thought on theory that a transistor amp would be best because of specs and above 3Khz, how could it matter? I was so wrong, although all of the amps did a decent job. I still don't know why a tweeter adds so much to the rendition of the spatial presentation.
Class AB transistor: dry, dusty, and flat
Class A transistor: better tone and lustre, but still flat and a little glarey
Class A push pull Baby Sophia: much better space and tone
Fox ASL 6c33 SET: dramatically better space, a but the tone not that great
Agape 300b: Like the spice from the Dune fantasy, opened up space, tone and timbre to make a nice psychidelic breakfast, but lacked some immediacy and lustre.
Korneff 45: not as much space as the 300b, but a lovely melting sheen and texture to the tonalities and authority, like "this is THE tone, accept it."Another good option is a single ended tube rectified el 84, which I use on the tweeter of my center channel when it is in operation. It probably falls somewhere between the 300b and the 45, although a 300b does that space thing so well. These can be had really cheap, I got a pair of Akai mono pulls from the old tape decks and they sound wonderful both full range and as tweeter amps, $150 and they can be found for half that. They also have a little more power (5 watts) if you are using very large arrays ot tweeters in series.
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