Amp craftmanship/Quality

I have heard it is not good to keep tubes in too long

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My tech is telling me to swa out my 4000++ hour power tubes Svetlana 6550;s as the Defy may get grouchy (=  may break down) if one tube blows.
I had 2 tubes go dark, , had 2 spares sitting on my shelf, lightly used, stuck those 2 in the spots,, Not sure if they matched the 3rd tube or not, Its a 12 tuber, 3 sets of trios.
I think the Defy deserves better reputation that it has over the years, 
Runs likea  champ and am rolling the dice on these worn tubes.
I have no cash as I spent all in my Wide Band experiements.
Now I am broke, No money for new tubes, Gonna run them til all burn out, 6k hrs or so.
Wish  the Defy good luck will ya
Recommend 2k hors,, I plan to get 3x's the life.....

Mine is from 1965, Modeferi himself went thru it…

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I have 2.  One has a really special sound. I've never touch either.
Remotes.. I love a remote. Gosh I'm getting lazy..

Say tomic601, how does the MC250 sound, I've never heard one of the old SS stereos Macs, but I did hear a set of Quads and a pair of mono blocks 50 or MC100 ?. That was an eye opener. The guy had a new MC2300. Those MC100 trounced the 2300 SQ wise.

He had a 1 6 foot tall bass column (MC2300) We though the guy was a genius. He was.. 1977 or 8. We called him, Two Mikes. Played a steel guitar..

Magic combo I always wanted in a room. 1/2 height Electrostatics and something..

Regards

Check out Toolshed Amps if you want to see artisan quality and workmanship.....

In my first "nice" system which consists of a Pass Labs X0.2 3-box arrangement front end, and a pair of Aleph 1.2 mono's (200 wpc Class A), plus a Nakamichi Dragon CD Changer, which are all about 20 years old now; all of my equipment runs like a top and without any problems.  I'm thinking that in 5 years or so, I'll need to send it all back to Pass Labs to have the capacitors all replaced.  Caps like any electrical part has some sort of limited service life.  

As far as you tubed gear running for 20 years without a hitch, that's impressive.  As for buying tube gear, I don't know the wisdom of this, but I *just* bought a pair of completely rebuilt Sonic Frontiers' Power 3 monos from SF Owner/VP Chris Johnson; the core is some 20 years old now, but they're built to "21st Century" Special Edition *Plus* and the power supply along with rectifiers are modernized in conjunction with the grid heater ckt; Mundorf gold & silver audio grade caps are used throughout plus it's modded to run up to KT150s, but I chose a bit of more conservative tube path in using KT120 tubes to replace the original 6550C (or KT88 maybe?) bottles; KT120s are about half the cost of the KT150 bottle and with 16 of them in total, getting stuck with a $2,000 dollar or so tube cost doesn't exactly sound mouth watering to me...  I've been waiting 20 years to buy these, and now that I have 2 nickels to rub together at this point in my life, I'll have them soon!  I can't wait.