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You have the best means of powering-up after a long period already. . .
Capacitor electrolyte in high capacity smoothing power supplies in
particular are notorious for being ineffective: possibly shorted: and even
blowing up the can with messy results.
Slowly increase voltage with the variac to reform electrolytic capacitors
with an ammeter in series with the mains output to the set: and if possible
another across the ht link to monitor current to ensure not excessive from
that normally expected.
Check voltages around the set afterwards.

Douglas Denny. G3ZQE.

On Sun, 9 Feb 2025, 22:37 Andrew Holme via groups.io, <andrew=
[email protected]> wrote:

My RA17 has been in storage unpowered since 2006. Prior to that it was in
tip top condition having been serviced by Rob Filby in December 1999. I
know it was unwise and neglectful of me not to power it for so long. What
should I do now to bring it up? I have a mains variac. Can I use that?
What is the procedure?

Thanks, Andrew.