Admiral 20X11 restoration

[Electronic M]

I've got one of that model cap checker (someone mounted a new transformer outside the case on mine) that I've been meaning to test/restore. I wonder how it compares to the heathkit C-3?

[Kevin Kuehn]

Is there an EIA code anywhere on the CRT or other tubes, indicating who manufactured them for Admiral? Is that rust on the transformer laminations?

[bandersen]

Originally Posted by Electronic M

I've got one of that model cap checker (someone mounted a new transformer outside the case on mine) that I've been meaning to test/restore. I wonder how it compares to the heathkit C-3?

There are some key precision parts in the CB-1-60 like a big tapped resistor divider and 2% capacitors. I'll post details in the Test Equipment forum in a bit.

I'm not familiar with the C-3, but I do have a Simpson 383-A Capacometer I'll be restoring.

Originally Posted by Kevin Kuehn

Is there an EIA code anywhere on the CRT or other tubes, indicating who manufactured them for Admiral? Is that rust on the transformer laminations?

Here are the markings on some 6AU6s. The CRT base is marked National Video Corp. Chicago, 10BP4 while the bell is stamped "Admiral" and "S". Perhaps it's been rebuilt

Yes, it sure is rust. I've worked on three 20X1 chassis to date and they've all had rusty power transformers. I use a little Loctite Rust Neutralizer on them than some satin black enamel paint.





The reforming seems to be going OK, but I had to use light bulbs of increasing wattage because my cheapo variac died a few months ago. It blows fuses instantly when it's turned on even with no load

[Kevin Kuehn]

I was just curious who sold them tubes. I suppose they may have even taken lowest bids. The 6AU6's are Sylvania (EIA 312).

[edit] 939 is likely 39th week of 1949

Rust converter is good on transformers.