The schematic of the Lil7 transmitter on the Phil's Old Radios site shows the wires going to pins 2&7 without passing thru the isolation transformer. Why wouldn't they be connected to the 120 output of the transformer?

:The schematic of the Lil7 transmitter on the Phil's Old Radios site shows the wires going to pins 2&7 without passing thru the isolation transformer. Why wouldn't they be connected to the 120 output of the transformer?

I wondered about that, too. I can only guess that since the main 120 Volts only goes to the filament, the designer thought it was safe to connect the filament directly and use a smaller power transformer. I would rather pay a couple of bucks more for a bigger transformer, and have *everything* isolated from the AC line.

Lewis L.

Concur with Lewis. Only 0.015A on the 125VAC winding. Below is specs from the AES site.

Richard

TRANSFORMER, POWER, 125 V, 15 mA

Primary: 117 volt, 50/60 Hz
Secondary: 125 V, 15 mA
Filament winding: 12.6 volt, 0.3 amp
Mounting centers: 2", U-bracket
Weight: 0.7 lbs.