Tube replacement/substitute

[Ken Ketner]

Greetings Dave: I don’t know of an online tube sub deal, but there are
any number of tube sub books out there to purchase. The best site for
buying out of print books is ABE (Advanced Book Exchange) — ADALL (maybe
one L) is also very good.
        In my Rider 1965 tube sub book a 6BD6 shows G (good) subs as 6BA6,
6CG6, or 5749. The 6BA6 is quite common.
-- 

Ken Ketner
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