precision AC laboratory power supply for Tube filament

Description

precision AC laboratory power supply for Tube
filament
It is a laboratory stabilized alternating current source for powering filament vacuum electronic  tube
they are in good shape and work great.
before sale, the devices underwent maintenance and testing.
also we have an adjustable power supply for the anode 0-300 volts, see my other lots or follow the link.
https://www.ebay.com/itm/254941077164
Made in the USSR
devices of 1985
power supply 220 volts
stabilized output voltages:
2.15 / 2.5 / 4/5 / 6.3 / 12.6 / 220 volts, see front panel
we can provide schematic and instruction.
The price includes international delivery.