19-05-2017, 05:21 PM
(This post was last modified: 19-05-2017, 05:25 PM by ppppenguin.)
I bought this rather lovely specimen at the NVCF last Sunday. I'd sold a fair bit of my own stuff on the B&B and so was feeling flush. I blew the lot.
It was being demonstrated on one of the stalls. powered from a small 12V SLA battery and giving nice 6cm sparks. I heard it before I saw it
It hadn't sold so towards the end of the show I did a bit of serious negotiating. Still a lot of money but quite a bit less than he was asking.
It's made by Griffin and Tatlock, predecessors of Griffin and George. I'm guessing 1920s or possibly 1930s.
I need to buy an SLA to power it. The question is what size. I've got an old-ish car battery on charge to use for tests. I'll measure the current - with an AVO rather than a DMM. The vendor said it took about 8A. If so, will I need a 7AH job like this: http://www.screwfix.com/p/sealed-lead-ac...51mm/38315 or possibly get away with a smaller one like this: http://www.screwfix.com/p/sealed-lead-ac...97mm/63554 or something in between. Capacity isn't the issue - I'll only run it in short bursts - but it's whether the voltage will sag much under load.
I'll also need to find an SLA charger - car battery chargers aren't ideal for SLAs.
PS: I'm sure it will cause a lot of RFI. Makes all you guys with CFLs, switchmodes etc look like beginners
It was being demonstrated on one of the stalls. powered from a small 12V SLA battery and giving nice 6cm sparks. I heard it before I saw it
It hadn't sold so towards the end of the show I did a bit of serious negotiating. Still a lot of money but quite a bit less than he was asking.It's made by Griffin and Tatlock, predecessors of Griffin and George. I'm guessing 1920s or possibly 1930s.
I need to buy an SLA to power it. The question is what size. I've got an old-ish car battery on charge to use for tests. I'll measure the current - with an AVO rather than a DMM. The vendor said it took about 8A. If so, will I need a 7AH job like this: http://www.screwfix.com/p/sealed-lead-ac...51mm/38315 or possibly get away with a smaller one like this: http://www.screwfix.com/p/sealed-lead-ac...97mm/63554 or something in between. Capacity isn't the issue - I'll only run it in short bursts - but it's whether the voltage will sag much under load.
I'll also need to find an SLA charger - car battery chargers aren't ideal for SLAs.
PS: I'm sure it will cause a lot of RFI. Makes all you guys with CFLs, switchmodes etc look like beginners
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
