On Fri, 24 Oct 2008 08:33:20 -0600, (Ken G.) put
finger to keyboard and composed:

Thanks Franc .. I dont know which conection is B+ on this . It seems to
be a Wells Gardner monitor according to a website provided i an arcade
newsgroup .

I would think that one end of the primary winding would be connected
to the collector of the switching transistor, the other to the B+.

If the FBT has any part numbers, try locating a substitute he

http://www.hrdiemen.es/products/inde...anguage=eng-GB

The HR substitute will have a wiring diagram with voltages.

I notice that the Wells Gardner Quadrascan colour monitor at the Atari
link provided by Dean uses a HV regulator circuit that senses a 180V
pulse from a tap on the primary winding and uses this feedback to vary
the B+ to the FBT, and thereby control the EHT.

- Franc Zabkar
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