On 18/01/2016 9:28 AM, Gareth Magennis wrote:
"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.
**Fair enough. However, the VCM163 is a VERY clever device, which could
be done more cleverly today. That said, it is very convenient and it
operating within specification. Except for the transformer switching, it
is a very simple device at it's core.
--
Trevor Wilson
www.rageaudio.com.au
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