On 18/01/2016 3:59 PM, Phil Allison wrote:
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.


**Schematic sent.


--
Trevor Wilson
www.rageaudio.com.au

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