Not coupling/decoupling caps, FILTER CAPS.
Here is the rub. There was a thread about V12i blowing fuses on the forum, HE had sent it to Cary, They did a (so called) complete rebuild and they started blowing coupling caps.
I told him my story and sure enough Cary had NOT replaced the filter caps but everything under the sun including one transformer.
Cary gets it back and replace ONE bad filter cap and one blown coupling cap.
The tech, was assuming the guy before him (AT CARY) did replace the filter caps (He didn't). The customer gets it back again and this is when I read his thread complaining about Cary. I would too.
He post a pic off site you can see they didn't even do a Hexfred upgrade but changed all these big old honkin' coupling caps. You know what it takes to charge big caps? Ask the filter caps that blew.. LOL
The whole story is He had 3 V12i. 2 mono one stereo. ALL started doing the same thing.
After Mr. Ralph, chimed in and confirmed my suspicion, the guy quit posting about his amps.
I have no idea what he spent, but V12i mono blocks or stereo amps are a sight to behold and listen to if they are done right. Blown up they are just a sight. A Cary V12 - V12r should outlast my grandchildren. I paid 165.00 plus postage and tax for all 4 560uf filter caps. I paid almost that per coupling/decoupling cap combo. Copper foils and teflons. Magic!
It takes me about the same amount of time to swap and bias valves, (10 minutes) vs. swap out all 4 FILTER caps.
BTW I offered to fix his Cary for FREE, if he would pay for the parts and shipping. Silence!!! :-) I am still looking for a second V12r. My wife won't give me mine back. I'm using a MC225 and a MX110. Women. :-)
Regards