Superheterodyne AM to SW conversion info
 

I was wondering if anyone has an info about converting an AM radio to
a SW one without down converting the signal? I have a defunct old
valve superheterodyne SW reciever and an old transister AM/FM
superheterodyne. Is it possible to replace the AM radio's tuning
variable capacitors with the SW ones and get SW, or is it more
involved than that? Any info will be greatly apppreciated.

Liam Ness