"Trevor Wilson" wrote in message ...

On 17/01/2016 3:04 PM, Phil Allison wrote:
Trevor Wilson wrote:



* I have a valve tester (AVO VCM163).


** The VCM163 ( Valve Characteristic Meter) is oddball among valve
testers, uses only AC voltages for ALL supplies - plates, screens and
grids !!

http://www.radiomuseum.org/forum/tub...principle.html

Expensive too, working examples go on Ebay for up to $3000.


**The transformers inside the thing are amazing things. They would be
very expensive to produce today. Mind-numbing numbers of taps.







I built this thing and modified it to suit my needs for basic valve testing.
http://triodeel.com/tester.htm

I trust it more than anything I might buy off the Interweb that is going to
be decades old.



Gareth.