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Valve testers

Three testers are in use to test the various valves in the collection.


B&K 606 valve tester

 

 

 

The first is a B&K 606 tube tester. This is a 110V machine in quite a compact format.

Precision 920 valve tester

 

 

 

The second is a Precision Series 920. This has been modified to run off 240V. Again this has a roll chart and a fairly large meter. This one does not have a B9A socket.

RAF Mk.4A valve tester

The part numbers of this tester are: 10S/658 (left hand panel) and 10S/556 (right panel)

The third tester is an RAF Mk. 4A set. This consists of two units in a sturdy wooden case. The input voltage is selectable by a switch on the main panel and ranges from 200 to 250V.

Testing a valve is a matter of selecting the filament or heater voltage, the pin position of the cathode (if present), anode, G1, G2 and G3, and the anode and screen voltages, inserting the valve and turning on.

This set does not have a simple Goood/Bad meter, but instead relies on two controls, one to zero the meter once the valve is under emission, and the other to zero the meter when testing mutual conductance - this second control has a pointer and the Gm of the valve is read off the scale.

The tester has sockets for British 4, 5 and 7 pin valves, British ('Mazda') and international octal, US 5 and 7 pin, 8-pin side contact (e.g. EF8), large British 4 pin, 9-pin loktal, acorn, and 3-pin base (VR92 etc. diodes).

This file was last modified 18:01:49, Thursday September 03, 2015