Antique Sound Labs

Maybe get in touch with Tosh Goka of Reference 3A?

Ah, direction already given. 

When/if you try them, use a Variac to slowly bring them back to life

https://antiqueradio.org/Variacs.htm

Will do. Familiar with the procedure. Thanks.

Bill Baker from Response Audio knows a lot about ASL. I believe he is working with Raven now, but the Response website is still up. He use to do a lot of modding on ASL.