I doubt that amp technology has changed very much. There is better parts available today. But you're already replaced some parts. A set of tubes is much cheaper than an amp. BTW I really like the 7581 tubes.
MC 240 ReTube or Replace
About a year and a half ago I acquired an old McIntosh
MC 240.
I replaced the capacitors and retubed it using:
Genalex Gold Lion 12AU7 gol
Genalex Gold Lion 12AX7 gold
Tube Amp Doctor TAD 12BH7
TUNG-SOL 7581A
Now after some 1,000 hours of operation, driving a pair of Salk SS 6m speakers, one channel will intermittently give out a blast of static within minutes of power up and blows the fuse. This leads me to believe I have a tube which may be intermittently shorting.
With the MC 240 being almost 60 years old I’m wondering if modern technology has surpassed it.
Thus, the question retube or replace it.
Currently my choices are:
Quick Silver 60 watt mono amps
Mc Gary Audio SA 1
Van Alstine Vision SET 400
I would appreciate any comments.
TNX