Cary Audio CAD-280SA V12R

They all pop up for sale periodically, particularly during summer time and function even better over the winter season. 

With twelve power tubes and four input/driver tubes, the collective sixteen tubes in a V12R also functions well as a great room heater. 

The el34 run the coolest, the KT88s run hot for sure.  I'm thinking 4 EL34 during the summer days, (ran cool actually) and I can add a quad or two for the evening hours, if  the occasion should arise... 

Yes wonderful heaters in the winter months, for sure. 

Now for a summer special. Someone's on the fence with an I or R
just waiting to find a new home....Probably in someone's closet as I type...

I'm patient... usually..

Regards

re: Heat, my local tech-friend (40yr Mcintosh tech, Repair/Modifier guy) was adamant I did not need to run the bias up to spec, had me running it as low as 200ma per side. Felt it was a waste of energy and extra heat for no reason.  I tried it at lower bias and it actually sounded great, ran cooler for sure. Extends tube life too!  

You know there is a a lot of talk on bias, cool leans out the sound thin, quack quack , to hot shortens tube life and runs hot . I've found that there is a sweet spot for biasing valves. It actually SOUNDS better. Again not just a little.  I use these from 300hz UP, no bass duty at all.

A Mac TEC, usually doesn't bias stuff after it's set up. Set it and forget it, its one of the good things about a Mac,  BUT I have a 240 you can.  AB (push pull amps) not so critical, Class A, it makes a BIG difference, AB too, if you really listen, just not as dramatic.....

So The R has the better transformer and the 12XXX. 

What about the monoblocks? same. Ver 1.2.3 ? Kinda rare for sure.

@oldhvymech
He was a Mac tech for his daily job, but did mods and built amps all kinds of crazy rebuilds and such on his own.  Retired now.  Built all his own amps, that kinda guy. I helped him on design and build of three pairs of large horn Altec/Onken copy  speakers, so she shared a little over the years. Was fun to listen to little updated 2A3 and 300B amps he modded.  He helped me to make my former V12R sing, was really nice.

Yes, "R" larger trans and "Bz7" TV tube, funny.  

Monos:
I'm not as up on the V12 mono blocks. Slightly different layouts.

Since KT150s came out I went a completely different direction, never pursued it any further with Cary monos after.