Tubes for BAT VK60. Need help

I've not had any issues with my amp blowing fuses other than once during an output tube failure.

Andy's advice is good, as is Dan's. The commercial grade NOS stuff is the best place to look for 6SN7 replacement. I replaced the front two positions with RCA red base 5962s from Andy some time ago and they are still rippin.'

Best bet about the output taps is to swap 'em and see what floats your boat. I've tried connecting the 4 ohm taps to my VR4jrs, but to my ears, the presentation was a tad more effortless using the 8 ohm taps.

"...the peak power will occur into a 3 Ohm load (in the case of 4 Ohm taps) and into 6 to 7 Ohm load (in the case of 8 Ohm taps)." The jrs are nominal 6 ohms.

I'm not sure how much topology difference there is between the 60 and 75, but I switched amps a while back (still using the red bases.) That being the case, take my opinion with a healthy dose of salt. I have read lots of praise for the NOS Sylvanias and aim to snag a pair of them to try in my new(er) toy, but no practical experience with any NOS goodies beyond the reds in your amp.

The description of the reds you provided sounds plausible, but since I didn't do a side-by-side with anything other than the factory 6H8C and some standby EH 6sn7s, I don't really have a frame of reference. FWIW, to my ear, the reds are definitely a warm and articulate tube in my 75. Verrry sweet.

Jim,

I'm a little late to the party, but in the future, you may want to consider ATSI for a matched & tested set of 6C33C-Bs. I bought my last quad there and have had really good luck (they have increased in price, though.) I believe he's the only game in town if you want matched tubes AND a 90 day guarantee.

I'll also second Andy at VTS. He's very knowledgable about the VK60 and which tube will get you what you are looking for.