Post by Peter Walsham on May 7, 2021 13:20:35 GMT 12
What I would recommend that you do, prior to considering a realignment, is to replace all of the old paper capacitors (assuming they are old paper ones), and checking the values of all the resistors, and replacing any that are more than 20% 'out'. Replace the other electrolytic filter capacitor anyway, as if it fails (shorts out), you stand a very good chance of 'cooking' the power transformer. It is highly likely that replacing all of the capacitors will make a huge difference to how the set performs. The old capacitors may externally look OK, but a leakage test will probably show that every one is leaky to some extent or another. Externally, a 'bad' capacitor usually won't look any different to a good one.
Good on you for wanting to restore this radio and I don't want to discourage you from learning about this but if you have never worked on electronics before, a tube radio is not a good place to start. There are significant dangers working on tube gear, notably high voltage both when the set is powered (and potentially also when it's not even plugged in) and the relative ease with which you can come in contact with the invisible force. The voltages can kill you. I would really encourage you to take the set to someone who is experienced, even just to learn how to go about servicing safely. Perhaps Peter can assist - I used to be in Auckland but vacated last year. I would have gladly assisted. Unless you feel like an 8 hour drive, LOL.
Last Edit: May 14, 2021 18:31:41 GMT 12 by Radiotech
Post by Peter Walsham on May 14, 2021 22:15:06 GMT 12
I would be more than happy to guide, help or assist in any way that I can. I live in Pukekohe. It can be very difficult to try & diagnose a problem via messages without having an opportunity to look at the set 'in person'. An alignment would be the last thing to do to a radio, being done after other work has been completed.