corndog71 wrote:Ah, those Roman numerals got me. I was talking about Mk4 amps. I don't know anything about the Mk6's
"Are you talking about MkVI (6) as the OP stated or MkIV (4) as assumed by the respondents? Two quite different amplifiers! The MkVI is not what I would describe as a "great little amp". The biggest issue with the Mk VI is the virtually unobtainable 8417 output tube situation."
Thank you both, gentlemen, for your comments.
The advice on the Mark 4s seems applicable to me, however, but that's why I came here -- for good counsel. I hear the 8417s run 'hot', so why not play with the idle current? -- apparently the plate life would benefit. Also, the use of solid state rectifier devices seems prudent. All these can be done easily. So, again, why is the Mark 4 advice not applicable?
I know the 8417s are difficult to acquire, but the original tubes have very few hours. In addition I've located 2 sets of quad-matched replacements -- in the event I commit to the Mark VIs.
So ... With spare tubes, some prudent poly cap upgrades, simple rectifier insurance, and refined bias adjustments -- why would the Mark VI not be a "great little amp'?
My time on this planet is short -- the glow in the night of a reliable tube amp powering a pair of my efficient JBLs or Klipsches would take me back to the days when I was a 'pup', and a cheap Heathkit tube receiver cost me every penny I could make in a year on my newspaper route.
It would be a fine feeling.
Sincere thanks, and please offer up more comments,