Sounds like it's time to send the unit for a check up. Could
be that some of the operating voltages are out-of-spec on
the high side (failed cap/resistor?) and prematurely blowing
out the tubes. Although I recently retubed my LS5mkII with
new Sovtek 6922s, the originals are still in perfect working
order after 7 years of fairly heavy use and are now serving
as my emergency back-up set. Preamp tubes should last quite
a long time if the unit isn't left powered-on 24/7.
be that some of the operating voltages are out-of-spec on
the high side (failed cap/resistor?) and prematurely blowing
out the tubes. Although I recently retubed my LS5mkII with
new Sovtek 6922s, the originals are still in perfect working
order after 7 years of fairly heavy use and are now serving
as my emergency back-up set. Preamp tubes should last quite
a long time if the unit isn't left powered-on 24/7.