Trevor Wilson wrote:
** 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.
** 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.
** Full article and internal pics he
http://schmid-mainz.de/Radio-Bygones_140.pdf
One of the C-Core transformers is used with a half wave load, which could make it growl a bit and get hot after a while.
BTW:
Can it be used with valves that have anode caps ?
Like the 6CM5, 6DQ6B, 807, 300B and 6146 types.
..... Phil