Luxman 3045 mb

The Luxman 3045B is outstanding. Aside from the usual periodic maintenance (re-caps, resistors, etc.) the circuit is sound. I used these for a couple of decades with a stash of the original high power triode tube.

With this amp, you're pretty much at the limit of push-pull sound. The transformers are beyond reproach. Instead of trying to make the Luxmans something they aren't (you're already a half-step back by the conversion to KT88s), accept your amps are sensational and consider your next step moving to an 845 SET or P-SET 300B amplification.

Phil

I had eight of these in the late 70s. Aside from the output tube becoming unavailable, by biggest problem was setting the bias. Each night all eight had to be biased and this needed to be repeated during an evening of listening. I did not have them or the Fulton Premieres for very long, largely because of this, but I did like the sound of these amps.

Thanks all. I do not have any technical experience with amps although I can and have replaced components. Can anyone explain to me how to find the items you mention: feedback loop resistors and capacitors; plate, grid, cathode, feedback resistors, and others. I have the circuit diagram with all labels and voltages, but I don't know which components are the above mentioned items. Many thanks again, I would love to keep these amps!

I believe you have a better chance of getting specific technical advice if you post on one of the tube DIY forums.

I had the factory KT88 conversion procedure manual mailed to me from Luxman. I can mail you a copy, email or snail mail. I converted my amps some fifteen (20?) years ago, and have been quite happy. The old design had the tubes right on the hairy edge of the operating envelope, that's why they went through output tubes and needed frequent bias adjustment. With KT88, you set the bias once (check after a few hours of break-in) then forget it. I have rechecked the bias after five years, and it remained rock solid. I have since upgraded the caps and resistors, and true to what Shussbliss says, I heard noticeable improvement.