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In Reply to: Michael Samra, Dukane amps? posted by gkargreen on March 9, 2007 at 12:10:49:
Do those have the 7867 tubes or the 8417s or 6l6s?
Follow Ups:
Dukane 1A435s use a pair of 7867s or 6CD6GAs. Seem to be good for about 35W betw about 100 & 10KHz and always on the verge of instability. Its big brother is the 1A475 and uses a quad of 7867/6CD6GA. It seems good for about 75-80W at same range and with same borderline instability. The circuit for the 475 can be found on Triodeel site and is easy to extrapolate to the 435.Big question: These amps were designed and sold as institutional PA amps where cost was a big factor. I continually see references to them where they're going to be restored (almost always not usable as found) and used as music amps. I can't imagine these being any good for music w/o major mods inc changing the OPT. Am I missing something??? I've got a few laying around awaiting dissassembly for parts (very cool running PTs). Should I reconsider the PT harvest???
Steve
Here is the problam with those..THe secondary of the OT is like 600ohms on some of those and I have a pair of the later dukanes with the 4 8417 tubes per amp and a 6fq7 and 12ax7.If your going to have to put in another transformer and then rebuild the amp,you might as well scrap it and start with a new amp from scratch.Big question: These amps were designed and sold as institutional PA amps where cost was a big factor. I continually see references to them where they're going to be restored (almost always not usable as found) and used as music amps. I can't imagine these being any good for music w/o major mods inc changing the OPT. Am I missing something???
The altec 1570s were actually intended for PA use and just background music they dont produce any bass per say in stock form but when you upgrade them,they are a world class beater.This is the same with many theatre amps like RCA 807 amps, and the altec 1530s are dream amps and I would even give up my last 3 ex girl friends that probably hate my guts and are no longer with me for a pair.
Michael, the amps I have are the 1A435, which include a 4 and 8 ohm out, any recommendations on those? Thanks!
Steve, I just put a pair in the system, and I was quite surprised how good they sound, they were just basically put up to working condition with little in the way of mods or upgrades, however, my thord one will be getting more in the way of upgraded parts. I find teh bass to be pretty good, and the high end to be quite nice and extended, although a bit coarse at this point, no doubt due to the new solens breaking in. I would think the OPT is too small for good bass, however, it beat the pants off of both of my ARC d90 and d70mk11 amps, no contest there. My main amps are stock altec 128b's and that is where the rubber will meet the road, so to speak. I would be curious to hear other user's crtique of these amps, and any mods that could be useful, if these amps are worth doing that to. My system includes the audio refinement pre5 and a pair of athena as-f2 speakers, no doubt some weak links, but when I get my speakers upgraded (esl-57s?) then it may be easier to get a truer idea of the quality of these amps. Right now, though, pretty good sounding stuff! (BTW, probably looking to change the 12au7s to 6cg7s in the future to see any improvements that may bring...)
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