WW2 Canadian Wireless Valve Testers

[David Dunlop]

I have now been able to pull together the appropriate settings for my Precision Series 612 Tube Tester to enable me to test the ARP-3 Pentode valves for my 52-Set Project, using the British Valve Adapter I was able to build.

A long overdue Calibration Test of the tube tester revealed no serious problems, and i was able to do three consecutive tests of the same ARP-3 valve and get readings within two points for the three readings. Quite pleased with that.

David

[David Dunlop]

This is the second British Valve used in the 52-Set Receivers and it utilizes the British 5-Pin Socket. It took a little digging to sort out, during which I ran across four different versions of the pin numbering for the socket, including the incorrect drawings in the 52-Set manual schematics.

Only two of these valves are used in the receiver. one is a Noise Limiter and the other serves the AGC circuit. This can come in handy because if both valves get a good rating when tested, but either of these two circuits are not up to par, I can swap the two valves as a first check to see if anything improves.

As far as the settings needed on the Precision Series 612 Tube Tester to test the 12Y4, I am about half way through sorting out that data. The main settings turn out to be the same as needed for the 12H6 tube, so all I have left to do now is sort the correct switches for the five relevant pins. Should have that done tomorrow and then I will test one of my 12Y4's to see how it works out.

If all goes well, I will tabulate the settings for the two valves and try posting a copy here for future reference.

David

[David Dunlop]

There is a small correction required in the Stark Valve Adapter Schematic shown back in Post 6.

The wiring is absolutely, spot on correct, however the pin numbering for the 5-Pin Socket needs to have the "2" and "4" Labels switched as per the attached copy of a Brimar diagram illustrating the Base Connections of Valves for the three common British Valves.

You will notice that once the two noted pin numbers are corrected in the Stark Schematic, the wiring flow will read consistently across all four valve sockets.

David

[David Dunlop]

Just in case it might prove helpful to somebody else, I have attached a copy of the settings I have worked out for testing the ARP-3 and 12Y4G valves on a Precision Series 612 Tube Tester, using this Stark based valve adapter.

David