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In Reply to: I've had good experiences with.... posted by doodlebug on February 28, 2007 at 13:05:36:
Oh yeah, I'm sure. The sound went crap all of a sudden, and the thing was glowing like it was about to explode, and now the inside of the glass looks funny.The amp was the worst basket case you've ever seen. The chassis is a corroded mess, but the workings have been completely redone. I was told at the time that vintage was all that was available, but its now clear that there is at least one East European provider (I assume they're out of Serbia).
Follow Ups:
7591s are currently being produced at Saratov, Russia (EH) and Jamona, Slovakia (JJ).Of late, JJ has been having QC problems in Octal tubes. So, EH is, at least for now, the primary recommendation. The EH tube's "bottle" is larger than that of NOS. If things are really tight, space wise, you may have to use JJ.
Unlike NOS, current production 7591s are not forgiving of grid leak resistors that exceed the max. allowable value. So, minor changes to the amp are in order. Contact AA sponsor Jim McShane for details about the circuit changes and a FAIR price on the tubes.
Eli D.
H. H. Scott was more conservative in this respect than many others like Fisher... no 330K resistors when the data sheet says 300K maximum... so should be OK with modern tubes.
more complex than wiring a light fixture. My soldering skills are appalling, and I really have no technical understanding of what is going on inside an amp.That said, this amp was rebuilt completely four or five years ago, and all the caps and resistors would have been replaced at that time.
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