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> 1 x vintage 12SA7 valve - tested - very good
1 x vintage 12SA7 valve - tested - very good
1 x Vintage 12SA7 valve - tested very good
1 x Vintage 12SA7 valve - tested - very good
This 12SA7 heptode valve has been tested on an AVO valve tester and has very good characteristics. All labelling has rubbed off, but someone has scratched the type number on the side of the base and I believe this to be accurate.
Ia = 12 mA & Gm = 4.3 mA/V for Va = 100 V, & Vg = - 3.6 V
results for this valve:- Ia = 15.6 mA & Gm = 3.45 mA/V
