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Original Message
How do you add it up ???
Posted by drlowmu on July 11, 2012 at 07:53:06:
Andy,
The JJs 2A3-40s are probably about half the price of a EML mesh. $500 a quad, not $1,000.
I pointed out right away - your DIY 2A3 amp's over 14.5 Watt dissipation is wayyyy too high, and the cause of (1) stressed sonics and (2) short Finals tube life.
If you replace a quad of outputs twice a year, that is 180 days at 24 hours, or a tube life of 4,320 hours.
That means your amp is mis-designed, because it is running the Finals too hard.
A JJ 2A3-40, with a 40 Watt plate, will easily go 50,000 hours at the 10 to 10.5 watt operating point I suggested, and importantly, it will sound better than at 14.5+ Watts of dissipation.
So, do you want to buy TEN sets of lesser tubes at $250 a quad set ( $2,500) to get stressed-sounding and constantly degrading performance...
OR...
wouldn't it be a LOT smarter to spend $500 to $1,000 on ONE quad set, $8 on some Mills MRA-12 Rks to run them at 10.5 Watts, to obtain five years of consistent and higher-level performance?
The way I see it, you are now paying BMW prices for YUGO performance.
Increase the Rk, use better tubes, you will love the sonics, and I would suggest its cheaper and better by far !!
Jeff Medwin