James,
the usual way bias is generated is to disconnect the HT- connection from the dynamotor from 0V and reconnect it by a "bias resistor". The entire HT current for the unit then runs through this resistor generating a -ve voltage for bias.
The bias resistor can be located in either the HT PSU, or in the receiver - it doesn't matter much which.
Its hard to say any more on this without the actual schematics, which will give bias resistor location and value.
Richard
Quote:
Originally Posted by jamesinnewcastl
Hi Richard
>Snip>>
I was OK with this until I looked at the HT supply of a later system to see the HT supply connected to the 0V! Sadly I don't have the receiver circuit of this later system so I can't see how they are generating the bias.
In any event I will have to suck it and see!
I'll post the results when I get them!
Cheers
James
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