One of my amps is an Alpha 76A. One thing I did not like about it was
that one of the meters could not monitor both the grid drive and the
power output. The second issue was that analog meters are very slow and
you cannot rely on them to know when you have reached a peak power
output, because it averages the signal.
My solution was to build an led array between the two meters, behind the
panel. No holes to be drilled and when the leds are not let, you cannot
see the display. I put the array to monitor grid current and it has
worked perfectly. Although I built my lled array from scratch, I see
that Marlin Jones has a small array on sale for $4.95 that might be
useful for watching peak drive.
The array consists of 5 leds and a log reading with a 16 db range. It
runs on about 9-12 volts dc. It can measure ac or dc and could be set
across the grid meter resistor to continually monitor grid current.
There is some information on the board at www.mjpa.com The part
number is 31297 MI and it is a VU led array.
73, Colin K7FM
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|