I just started the same work on 3 of almost dead ebay Mark III's, in retrospect should have just called Kevin at Dynakit and got new transformers too from him (got the rest of the parts)
Oh well, in for a dime in for a dollar.
I have 3 of sets or transformers and what looks like a mix and match of transformers, some cloth, some mixed, and one vinyl leaded units.
I pulled all the bells, most were the wrap around the core edge style and one out of the 6 was a flat bell. Also looks like mix and match on the bells too, number stampings were for power bells on output transformers. Some evil doer had their hands in this mess.
Just got into cleaning them up. Put the bells in a vibratory polisher and some media that cleaned them up very nicely ready for primer and paint. Now the couple of questions -
- Some transformers had 2 bolts (center) holding the bells together some had 4 (Outers), is it better to user 2 or 4 or all 6 to hold the transformer together?
- A couple of the core have some rust on the tops and used a scotch bright pad and now what to do? Black Paint?
- Should I worry about the one transformer with loose laminations?
Picked up some stainless screws, kep nuts and new fiber washers from McMaster Carr as well to clean up the corroded ones that were on the transformers.
Seems like a few of us are about at the same point in the rebuilds