Tube dual opamp

Posted on Jul 3, 2012

Here are photos of a tube unit including an analog multiplier, phase discriminator and a relay control driver (a big relay was inserted in a socket near two potentiometers on the left). Used in ground control gear (don`t ask me - control of what..., all I know it`s ground, not mobile, piece). Chassis is machined of a solid aluminum piece - 31*12*5 cm. There`s a total of nine miniature tubes (2 RF pentodes, 7 dual triodes). The compartments on the left, top right and bottom right are normally covered with tin lids, so the whole unit is one smooth brick with a window in it.

These units are stacked vertically in a rack, windows form a chimney for air cooling. The thing ran on a low B+ - all caps are 160V rated, the largest resistors 1W rated. Note the daisy-chained heater bus (white-blue wires) - something you don`t want

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