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.
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.