[BC] BE FM10A

[John Lyles]

Bill
Can't you rebuild your metering board? The one on the original FM3.5 and 
5 kW models was 919--0048-004, that fitted on the filament studs on the 
side of the lower enclosure of the PA cavity. I designed that around 
1983. It sounds like BE sent you the later redesign 919-0048-008. Both 
had the fusable link, which is in series with the center tap of the 
filament transformer. It was 28 AWG wire and I suppose it would open if 
cathode current was high enough. Memory is vague of this, and I don't 
have the online schematic of the earlier board here, only the later 
version in the T series.

If you have a small HV supply, you could test the BE HV meter with the 
series multiplier resistors. There has to be a short across the meter or 
an open in the circuit somewhere?

Regards
John Lyles

On 12/16/11 6:00 AM, broadcast-request at radiolists.net wrote:
> Message: 22
> From: Bill Allen Jr<n8uhn at yahoo.com>
> 	<1323993313.79526.YahooMailClassic at web30501.mail.mud.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1
>
> Anyone got a metering board for the BE fm10A for sale?
>
> called BE and ordered one by part number and they shipped a built "substitute" cuz' the real one is no longer available.
>
> the sub wasn't even close!
>
> i need the board that screws directly to the filament bypass cap's (both) and the wires for the xmtr have ring terminals.
>
> the sub they sent has tab terms on it and does not screw to the cap's.
>
> i would rebuild the bd myself but, would rather put in a different board while i'm doing it (why would be put the screen fuseable link on a metering bd?).
>
> btw, has anyone had an fm 10a's plate voltage meter circuit go bad with no plate volt's measured?
>
> i replaced all the resistors in the plate meter multiplier board and the diode,cap and small resistor tests good.
>
> the meter tests good as does all the wiring and still no plate voltage on the meter.
>
> disconned the telem wiring and APC suspecting a short and still no plate volts on the meter.
>
> am missing something or do i have to buy this xmtr dinner!
>
> Bill