Identifican request - 3 Valve mains superhet

[Crackle]

The small round ones, photo 2 dont seem to work at all.
I would think the diodes in the 3rd photo would be more reliable, 2 out of the 5 I have seem to work with a resistance of about 4M one direction and 3M the other direction.
The most reliable seem to be the 4th photo type, 2 out of 2 seem to work.
I dont think you can test these on an ordinary Multimeter diode test.
Mike