DIY 175w M57/H39 Control Gearbox for 240v 50hz: Internals.
Control gearbox for 1 x 175w mercury or metal halide lamp.

Nice big chunky CWA ballast.

All exposed metalwork earthed, bootlace ferrules, crimped & soldered spade and ring terminals, tri-rated cable... all the usual refinements.

Also handy for running 200w SLI/H Linear low pressure sodium lamps!

DIY 175w M57/H39 Control Gearbox for 240v 50hz: Internals.

Control gearbox for 1 x 175w mercury or metal halide lamp.

Nice big chunky CWA ballast.

All exposed metalwork earthed, bootlace ferrules, crimped & soldered spade and ring terminals, tri-rated cable... all the usual refinements.

Also handy for running 200w SLI/H Linear low pressure sodium lamps!

Photo_12-07-20252C_16_02_52.jpg 387A5227.JPG 387A7501~0.JPG 387A4622.jpg IMG_4770.jpeg
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Alex   [10 Apr, 2026 at 07:28 PM]
very nice to the the 50hz variety. I have an american one which i use. it seems to take the 10hz less quite well
FrontSideBus   [10 Apr, 2026 at 08:12 PM]
I dug this out to play with that SLI 175 MH lamp. She's a bit of a hummer this one!
Kev   [10 Apr, 2026 at 08:52 PM]
Bloody hell never seen one of these before

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