I have tried both KT-88 (from Kevin Deal through the grapevine of Audiophile friends) and 6550C -- I think KT-88s are nice, but I prefer the 6550Cs. I have went with warmer / lusher tubes in my pre-amp, and I think that the combo was too much. It all depends on your system & ears. The KT-88s will work, I have heard that they may be less stable than 6550C, also be sure to turn the bias WAY down before inserting them -- have heard of an occasional screen grid resistor blowing (also true with 6550s). Good luck!!
Tube biasing for ARC and fender equipmen
Hi,
FENDER QUESTION:
In my fender hot-rod delux amp, I recently swapped the stock sovtek 5881 6l6 tubes for some svetlana 6l6gc's. I checked the bias, and it was at 80mv instead of the 60mv it should have been at. I next put the old tubes in, and noticed they were at the prescribed 60mv. I put back the new tubes, and lowered the bias so they too were at 60mv. I guess i learned to turn the bias DOWN before putting new tubes in. Should these tubes be run at 60mv as the old tubes were ?
ARC QUESTION:
1) Is it safe to put a set of Svetlana kt88's in my vt100m2 amp? It currently uses Svetlana 6550C's with bias point of 130mv. According to everything I have read, it is a safe swap.
2) Also, should I set the bias point the same with these tubes, and is there anything else I should do to the amp ?
FENDER QUESTION:
In my fender hot-rod delux amp, I recently swapped the stock sovtek 5881 6l6 tubes for some svetlana 6l6gc's. I checked the bias, and it was at 80mv instead of the 60mv it should have been at. I next put the old tubes in, and noticed they were at the prescribed 60mv. I put back the new tubes, and lowered the bias so they too were at 60mv. I guess i learned to turn the bias DOWN before putting new tubes in. Should these tubes be run at 60mv as the old tubes were ?
ARC QUESTION:
1) Is it safe to put a set of Svetlana kt88's in my vt100m2 amp? It currently uses Svetlana 6550C's with bias point of 130mv. According to everything I have read, it is a safe swap.
2) Also, should I set the bias point the same with these tubes, and is there anything else I should do to the amp ?