27-06-2016, 08:19 PM
(This post was last modified: 27-06-2016, 08:20 PM by AlanBeckett.
Edit Reason: Typo
)
Pins 3 and 4 are the problem. They are marked as Internal Connections on EF41. Some Manufacturers were brave enough to use them as 'Alternative' Connections, but it's not to be recommended, particularly if Valves come from different manufacturers.
On EAF42 Pin 3 is the Diode Anode and Pin 4 is G3 - Suppressor. If there's no connection to Pin 4 then I would guess it should be an EF41, but not certainly. Manufacturers of that era often substituted similar Valves if they couldn't get enough of the usual ones.
That Supply to the EC92 looks OK from the Data Sheet. What are the other Voltages like?
http://www.r-type.org/exhib/aai0173.htm
Alan
On EAF42 Pin 3 is the Diode Anode and Pin 4 is G3 - Suppressor. If there's no connection to Pin 4 then I would guess it should be an EF41, but not certainly. Manufacturers of that era often substituted similar Valves if they couldn't get enough of the usual ones.
That Supply to the EC92 looks OK from the Data Sheet. What are the other Voltages like?
http://www.r-type.org/exhib/aai0173.htm
Alan
