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Re: any info on 7868 tubes
Posted by Eli Duttman on March 22, 2002 at 12:53:00:
You have caught a break. The 7591 and the 7868 are electrically equivalent. NOS 7591s are in no better supply than NOS 7868s. The "recently" introduced current production 7591 by ElectroHarmonix changes the "picture". The EH 7591 is physically large, but my understanding is that it will just fit in a Fisher 400. You need a competent technician to change the sockets from Novar to Octal and rewire for the different pin out. BTW, the reports of the sound of the EH 7591 have been favorable.