[Test-Equipment] Simpson 311 rf probe

[Edward Knobloch]

Hi, Gang

I have a Simpson 311 VTVM that I enjoy using.  I see that Simpson at one
time
offered an accessory rf probe consisting of a 6AL5 tube in the probe
body,
receiving filament power from the 1/4-inch phone plug on the front panel
of the 311 VTVM.  They claimed usability to 100 MHz, up to 400V peak to
peak
or 150V RMS using that rf probe.

Apparently the 6AL5 in the probe was set up to respond to peak to peak
levels, 
unlike the peak reading half-wave rectifier tube used by HP in the 410B 
and 410C VTVM's.

Can anyone point me to a schematic of the Simpson probe?  
I have the manual for the model 311 itself, and the accessory probe 
is not included.  BAMA didn't help.

Simpson dropped the rf probe, and the jack to power it, 
from the model 311 series 2 VTVM, so I guess they didn't sell
very many rf probes.

73,
Ed Knobloch