UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Beethoven 4 valve set, Identified as a model 99.

Gridiron · 30th Jun 2020, 4:57 pm

Only similar sets listed in the Mullard Valve Replacement guide are:
AC78 : VP4 or VP4A (7 pin), 354V, PENA4, IW3
AC99 : VP4 (7 pin), 354V, PENA4, IW4/350
283 : AC/VP1, 354V, PENA4 (7 pin), IW4/350

If model 77 is the same as AC77 this is must be a superhet as has a FC4 in the list of valves.
Mike.

30th Jun 2020, 4:57 pm	#8
Gridiron Heptode Join Date: Apr 2010 Location: West Midlands, UK. Posts: 663	Re: Beethoven 4 valve set Only similar sets listed in the Mullard Valve Replacement guide are: AC78 : VP4 or VP4A (7 pin), 354V, PENA4, IW3 AC99 : VP4 (7 pin), 354V, PENA4, IW4/350 283 : AC/VP1, 354V, PENA4 (7 pin), IW4/350 If model 77 is the same as AC77 this is must be a superhet as has a FC4 in the list of valves. Mike.