Substituting type 30 for 01a tube

8/7/2006 7:34:46 PMBill

I have been using type 30 tubes to replace 01a's using 2v on the filament as recommended. Will the type 30 work as a grid leak detector as well?

8/7/2006 8:16:17 PMDoug Criner

Bill: Probably, give it a try. Won't hurt.

But why are you using 30s to replace '01As? Cheaper?

:I have been using type 30 tubes to replace 01a's using 2v on the filament as recommended. Will the type 30 work as a grid leak detector as well?

8/7/2006 11:09:25 PMNorm Leal

Hi Bill

Here is something I wrote up a long time ago:

http://antiqueradios.com/chrs/journal/replacement.html

Except for filament voltage both tubes are similar. The 30 will work as a grid leak detector.

Norm

:Bill: Probably, give it a try. Won't hurt.
:
:But why are you using 30s to replace '01As? Cheaper?
:
::I have been using type 30 tubes to replace 01a's using 2v on the filament as recommended. Will the type 30 work as a grid leak detector as well?

8/7/2006 11:12:18 PMBill

:Bill: Probably, give it a try. Won't hurt.
:
:But why are you using 30s to replace '01As? Cheaper?
:
::I have been using type 30 tubes to replace 01a's using 2v on the filament as recommended. Will the type 30 work as a grid leak detector as well?

Yes, 30's are alot cheaper.