mtflycaster
Member
Friends -
Long time member, lurker and occasional poster here. I just picked up a near mint M4 that was "not working". Hooked up some cheap speakers and, sure enough, no sound out of one channel, and weak out of the other. Sooo....
I checked rail voltage - fine. Checked DC offset - fine. Checked bias - fine. Maybe an input issue? Cleaned the pots in the rear and voila!! Beautiful sound out of both channels using a Marantz 1090 as a preamp.
This amp is unmolested. It sounds great with my Polk 10B's, but I know it's electrolytics are old. Should I just use it, or pre-emptively recap it now? And, in looking at the cap list, I see a few .68 and 1.0 uF electrolytics. Can I replace these with film caps, or is that ill-advised?
Thanks, and best to all...
-MTFly
Long time member, lurker and occasional poster here. I just picked up a near mint M4 that was "not working". Hooked up some cheap speakers and, sure enough, no sound out of one channel, and weak out of the other. Sooo....
I checked rail voltage - fine. Checked DC offset - fine. Checked bias - fine. Maybe an input issue? Cleaned the pots in the rear and voila!! Beautiful sound out of both channels using a Marantz 1090 as a preamp.
This amp is unmolested. It sounds great with my Polk 10B's, but I know it's electrolytics are old. Should I just use it, or pre-emptively recap it now? And, in looking at the cap list, I see a few .68 and 1.0 uF electrolytics. Can I replace these with film caps, or is that ill-advised?
Thanks, and best to all...
-MTFly