[Geoff]

Mogens V. wrote:
Are SM57 capsules available 'loose', or do other capsules exist,
resembling this for close micing [guitar cabs] ?

If none comes close, I'd assume an SM57 can be taken apart, i.e.
separating the head. What's the approx dimentions of this assembly?

How much of the SM57's close micing qualities are due to the capsule
itself vs the electronics?
I realize diaphragm material, compliance et al.. matters a great deal.

If you want a SM57 capsule, then buy one. Available as spare parts.

"Electronics" ? What electronics ?- there is a transformer....

geoff