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In Reply to: RE: hmm, did I bite off more than I can chew for this tuner? posted by ltman on June 23, 2023 at 17:15:16
Hi itman,
I built a FM-3 in 1966, along with a ST-70 and PAS-3. That was the foundation of my first stereo and a great system that I enjoyed for a few years until I sold it to friends prior to a cross country move.
Since it was designed as a kit the manual describes the full alignment procedure. So I suggest finding a copy of the manual and including that in your restoration.
Obviously I'd test all tubes prior to turn on as well.
"In short, you can purchase this record with no fear of its becoming obsolete in the future." Columbia record jacket - 1959.
[[Obviously I'd test all tubes prior to turn on as well.]]
Good point. I'll have to do some research on the tubes so I can at least test for shorts. That's probably all I will be able to do given my knowledge and tools.
The ebay seller claimed it was a working unit, but I never trust such claims. With old electronics, my experience has been that such claims are more often false than true.
I don't see any leaking caps or burn marks anywhere which is more than I can say about a Pioneer F-90 tuner I recently bought from the bay. Again the seller claimed it worked, and it does - except for the intermittent but pretty frequent loud popping sounds after about 1/2 hour of use :)
I opened it up and sure enough looks like every single electrolytic is leaking. So I have a cap replacement kit in transit for that tuner. It does sound great though when not popping :)
I have pdf version of the FM-3 manual and if IIRC the manual does specify use of a VTVM for testing/alignment, which I do not have access to. So I have to figure out what to do about that. I do not have enough knowledge to know if using a modern dvm will work correctly for the testing given how the two devices interact differently with circuitry.
I do have a signal generator and both analog and digital scopes but again,
I'm an untrained novice just learning to understand the theory of the circuits and use of those devices.
Given that the FM-3 appears to have all original tubes I am thinking I can resell without loss if I decide to. So that would be around $200 given the purchase of the tuner and restoration kit. I am not the type to try and make a profit from reselling, way too much hassle to be worth the trouble to me.
Others with more electronics knowledge will hopefully add on here.
I would want to test all tubes before turning it on. Maybe you can find a tech locally to help with that?
As a kit, Dynaco made it as simple as possible. You should be able to do the alignment with just the tuning eye (assuming that tube still functions). Also, VTVMs were what was available when these were new. I don't know why you couldn't use a modern multi-meter.
"In short, you can purchase this record with no fear of its becoming obsolete in the future." Columbia record jacket - 1959.
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