• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Lumley reference

what do you mean by "strange"? I have a pair of m250 (although not the ones re-distrubuted with the reference label) that have something majorly amiss. They decided yesterday to quiting firing up. I mean, the warm up stage won't even fire up. troubleshot all the basics and can't seem to find anything obvious. I was hoping that maybe you had found some more information and could help me. I got these from Jonathan Valin after they were sent to him for a review. But I didn't get anything but the amps.

Thanks in advance,

HuggyBear
 
Hi...
this is almost a year ago now, when he first bought the amp second hand....
It proved to be that the ECC82s and 83s were interchanged.....
( he is not a very "electronic" guy...;) )

For the schematics...??
Nothing....nada... nix to be found anywhere.....

However ,- without retracing the whole schematics from the hardware itself...I think it is a fairly standard 6550 based amp, so searching though other tube amp libraries on the net should produce some fairly identical schemes...

Regards