We are offering a vintage AVO valve tester as it is surplus to our requirements. We are upgrading our testers.
While this tester is fully operational, you must keep I’m mind that this design from the 1940’s does not in any way meet any modern electrical safety standards. It should be carefully checked over by a qualified engineer before using.
I added a B9A tube socket so that it can test B9A valve based valves such as ECC81/82/83 ( 12At7/12Au7/12AX7) and many others. The tester dates from the early 1940’s but has been cared for.
Valve configuration is set by the thumbwheels and you can get all the settings online. For example here is a link to an Ebay vendor of the full data. Click here
It is a good tester for checking out valves in an amp to see if they are good or worn. It has been used by us as a back up tester.
It tests output valves at typically 150 volts and -1 volt bias and the anode currents are in the same range as if the valve was running at 400 volts in the -18.0 to -20 volts.
The meter movement is good. This unit needs collected because the meter movement is very sensitive to mechanical shock.
You can see the tester in operation before collecting. We are located in Scarborough on the Yorkshire coast.