15-04-2015, 11:08 PM
I should not have a problem with fine wires on the coils on this Marconi. They all look sturdy and are solid copper.
***
I got the Megger out to play today.
C20 phase splitter control grid was awful at 400K. I found a Mustard that looks like the replacements that had already been fitted to the oscillator section and tested it before fitting. C21 on the anode side of the phase splitter was 5 Meg and C22 cathode side was 25 Meg. The other two blue capacitors read 500K and 1 Meg so they were bad too.
I use the bung drill method for the metal canned types and this worked well. I de-solder the old wires where they go through the rivets in the bung and pull them out to leave the clear hole on one end and do the same at the other end The drill does not suffer badly with snatching due to it landing on the internal roll of foil that then rotates. The foil then needs to be dug out.
I then feed the new capacitor in with the lead through the original rivet and solder it and at the drilled end fit a grommet to fill most of the space and top off with epoxy.
***
I got the Megger out to play today.
C20 phase splitter control grid was awful at 400K. I found a Mustard that looks like the replacements that had already been fitted to the oscillator section and tested it before fitting. C21 on the anode side of the phase splitter was 5 Meg and C22 cathode side was 25 Meg. The other two blue capacitors read 500K and 1 Meg so they were bad too.
I use the bung drill method for the metal canned types and this worked well. I de-solder the old wires where they go through the rivets in the bung and pull them out to leave the clear hole on one end and do the same at the other end The drill does not suffer badly with snatching due to it landing on the internal roll of foil that then rotates. The foil then needs to be dug out.
I then feed the new capacitor in with the lead through the original rivet and solder it and at the drilled end fit a grommet to fill most of the space and top off with epoxy.
