[BC] BC-1G Advice

[dynotherm at earthlink.net]

-----Original Message-----
>From: Bob Groome <bobgroome at yahoo.com>
>
>A quick note on the 1G, no taps on the plate
>transformer. It was designed for 208 V AC. 
His 1G will work well with the slightly
>higher plate volts. 

Before your time perhaps, but I was at 123
Hampshire in the late '60's working for
George Yazell, with Bill Ellis and Bill
Massey. I do believe Electro made a 230 V
plate transformer used in some boxes.

>Also no taps on the FIL transformer and it's easy
>to get bad tube life with more than the 6.3 on
>the 807's.
>Easy to fix with a rheostat in series with the
>FIL xfmr's primary, though.

Very true, HOWEVER, DO NOT trust the voltmeter
on the panel. Measure the voltage on the tube
terminals directly and be sure the connections
are tight and not burnt.

>Like the earlier post on the shunt in the ATU (a
>Gates 44) for best power transfer. His line is 52
>ohms. A bridge can set the input of the ATU to 52
>ohms and let the transmitter tune for best match
>into the 52 ohm line.

Leveling the line with RFA's will work best for
him and eliminate any potential measuring errors.
I agree with using an OIB to get the ATU close,
but - in this case - strongly recommend old fashioned
leveling for the best results. In a 1T or 1G, this is 
a piece of cake because you have the line current RFA
and dummy load built in for verifying another meter
with the line RFA.

Phil Alexander, CSRE, AMD