Simplex 70w SON Bulkhead - Innards

A recent acquisition, this rather nice Simplex 70w SON bulkhead. Three of the case screws were seized solid which I had to drill out, once I got it open I found it had a hammered 70w Crompton SON-T fitted dated 2001, I very much doubt it's been in use all that time though. Of course it works fine after fitting a new lamp.

Simplex 70w SON Bulkhead - Innards


A recent acquisition, this rather nice Simplex 70w SON bulkhead. Three of the case screws were seized solid which I had to drill out, once I got it open I found it had a hammered 70w Crompton SON-T fitted dated 2001, I very much doubt it's been in use all that time though. Of course it works fine after fitting a new lamp.

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Slyspark   [12 Mar, 2018 at 07:53 AM]
Rather an interesting circular ballast in that!
fluorescent   [12 Mar, 2018 at 12:23 PM]
Yeah I don't know who makes them, but I've seen these circular ballasts before in Holophane 80w MV bulkheads
Danny   [12 Mar, 2018 at 01:21 PM]
That’s a queer old ballast ain’t it ive not seen anything like that before
lampy   [12 Mar, 2018 at 04:56 PM]
seen these heavy duty bulkheads before, popular on brewery sites and powerstations. think they did them in hammered silver paint too. you dont find them too oftern as they are very heavy duty
AngryHorse   [12 Mar, 2018 at 07:47 PM]
Never seen a round ballast before Shocked
Ash   [12 Mar, 2018 at 09:35 PM]
Toroid core - Nice ! But how did they get a gap in this one ??? (all magnetic ballasts have an essential air gap in the core)

Comment 1 to 6 of 6
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