Quote:
Did you look for a tuning slug accessible from below? It may be hard to reach,
but alignment is a bench job rather than an 'in-cabinet' job. If you find no tuning slug,
you will have to do with a single adjustment point as discussed above.
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Nada. I don't see any possible way to adjust the coil.
This may well be intentional because the alignment on the set has to be in-cabinet; the dial face is mounted to that as opposed to the actual chassis itself - if it's out on the bench, you can't see where you're supposed to be!
In addition, we've already found a few differences on the schematic and the actual set, such as the line (filter) caps/resistor values and loudness taps/caps on the volume control.
Taking a pot-shot, I'd say the 4068 model is based off the 2053 and is either a later run or intentional design change, resulting from component supply issues or so (but it was either short-lived or so similar they did not want the added cost of making new schematics/layout diagrams). I'd be interested to see whether the tuning caps are also mislabeled on a "true" 2053. (note they're also mislabeled on the sheet stapled to the inside of the cabinet).
I will re-draw the schematics with the additions and upload them to the build log when I make the next update. There's really not much new going on that's picture-worthy at this point, hence the long delay in updates.
Also noticed that there's some rust on the magnets at the back of the speakers... worth worrying about, or no? It just looks like a small surface coat, not like the whole magnet is disintegrating.