Music Magnet 4 AC Version
Was presented with a fine example of Music Magnet Four a while ago, and have started to look through it but it requires a couple of 650ohm grid leak style resistors. Any suggestions on these would be welcome as i have only ever seen much greater values. These are used for cathode bypass. see circuit.
So another question, what does everyone else do with these capacitors. Can they be opened neatly for re stuffing ? It is very evidently electrically leaky.
It seems to be very rare, they were a kit offered as an upgrade for the 2 volt battery version or fully built which this one appears to be.
That capacitor looks similar to ones used in the R1155 radio, does it have a rubber bung at the top end? if so I just pulled it out on those, removed the innards and replaced with a new cap, cut a circle of thin card and stuffed it into the end where the rubber bung had been, then used 2 part epoxy (Devcon 5 minute, Araldite may work too) with a tiny bit of black paint in it to fill the end, complete with original solder tag.
The capacitor is open at last, what a work of art. Must have taken serious time to make each one.
It involved grinding back the female threaded brass end, heated the opposite end of the brass can with a heat gun until the solder is removed from the join, the end can be depressed inside (there is an actual spring !) revealing a slight lip on the can. Remove the lip diameter slightly and the innards can be pushed out. The female threaded end is a 5mm brass rod almost the entire length of the capacitor and actually acts as the former for the dielectric paper.