[Milsurplus] BC-779 Update

[WA5CAB at cs.com]

Joe,

The SuperPro line does not use series/parallel filament strings.  There is no 
need for any resistors in the filament circuit.  I won't claim that this has 
anything to do with the overload problem but it certainly isn't helping 
anything.

If you didn't already disconnect the filament supply, how did you measure the 
resistors?  If you tried to measure them in place, you have the transformer, 
the other resistor in series with all of the tube filaments in parallel with 
the one you are attempting to measure.  But in any case, it's a moot point 
other than technique.  They need to come out.

In a message dated 1/6/2007 10:10:52 PM Central Standard Time, 
carolew at bellatlantic.net writes: 
> 2. The filament voltages are about 5.2V, instead of 6.3. There are two 
> 4-ohm filament dropping resistors. Each reads about 2.5 ohms. Do you think these 
> resistors might be causing the low filament voltage? While the power supply 
> is home brew, the transformer does have a 6.3v (5A) secondary. Tomorrow, I'll 
> take the terminal strip off the back and measure the filament output from the 
> power supply without the receiver attached. 
> 
> 

Robert Downs - Houston
<http://www.wa5cab.com> (Web Store)
MVPA 9480
<wa5cab at cs.com> (Primary email)
<wa5cab at houston.rr.com> (Backup email)
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