Nakamichi AV-1 tuner intermittent popping static sound

[cgla]

I have bought an AV-1 receiver used about a year ago. I absolutely love this amp. It has very good weight 33+ lb..and kicks my B&W speaker very well..

Recently, it has tuner issue for several months: When I listen to a FM station for a 5-10 minutes, it lost the signal and have pop/static sound. This lasts about 10 min or so, then it picks up the signal and works again, and then pop/static,,, repeat...

I tried to get a separate tuner, but to be honest, I can't get one within my budget( 200$) that sounds better the Nak built-in tuner.

I really want have my AV-1 tuner back. Could someone help me!

Thank you so much.

PS. anywhere can get service manual?

[Mooly]

Tuner problems can be difficult.

I have never seen the Nak AV1 but would suggest you check very carefully for any poor joints particularly PSU rails to the tuner.
Look for any regulators/transistors etc in the PSU that run hot... things like that are favourite failure items on any equipment. Maybe a litte freezer spray dripped on to (not blasted at ) any suspect devices, IF amp chips etc might help narrow things down a little.

In my experience faults like this often have a fairly straightforward cause... very often PSU rail problems.