Sounds like an autopilot servo amp. In the late 40's Esse (sp?) was selling a servo system black box set really cheap in CQ magazine. Maybe part of this?

Jeep K3HVG

On 01/08/2025 2:00 PM EST Michael Kana via ARC5 <[email protected]> wrote:

Hi all

I found what looks to be a WWII or later “black box” amplifier made by Pioneer Instruments/Bendix

It has a USN acceptance stencil, and 4 canon plugs. Inside are 3 6SN7s and 2 6H6. The box is marked 26vdc 110v 400 cycles

I suspect this is some form of instrumentation amplifier or audio?

The fact it had three audio amplifier tubes got my attention….

Thx 73

Mike

AA9IL

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