McIntosh MC352 lamp replacement

Thanks so much for your response, Theo. Yes all the lights are out right now.

I understand that they are all out now but did they fail all at the same time? If so, as mentioned I would suspect the power supply of a connector with in the unit.

Lamps that run hot do not like to be touched with bare hands.
Oils / Salts from the fingers when heated can actually cause a lamp to burn out more quickly.
In the past when I changed hi-pressure mercury vapor lamps, I wore latex or vinyl gloves and cleaned the lamp with 100% iso alcohol and a lint free wipe.

...That may be a reason that lamps which are replaced don't seem to last as long.

I really like the idea of a LED kit. Heck, I even went to LED Christmas Lights!