Re: [TenTec] Bias Adjustment on Century 21

[w8au@sssnet.com]

At 01:36 PM 6/16/2009, w8au@sssnet.com wrote:
> At 12:45 PM 6/16/2009, Tom, N0JMY wrote:
> > > My question is basically where/how (in physical terms) do you measure
> > > this current?  The final amp is a sealed unit for all practical
> > > purposes.
>
> The 12V buss enters the PA section through a feed-thru insulator.
> Usually a RED insulated wire.
> Just unsolder this lead and insert the VOM.
Forgot to add:  if bias pot controls the final amp and you
want to eliminate the additional reading of the driver,
just crank the pot to full cutoff, measure the current
and then adjust the pot for an additional 6 ma.

Perry