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Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders. |
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26th Mar 2024, 12:22 pm | #21 |
Dekatron
Join Date: Nov 2010
Location: Oxford, UK.
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Re: Type 13A 'scope, full brightness on lamp limiter!
Age 15 I hoiked the 13A up a flight of stone steps, and put it on a bench in our porch.
Over half a century later, there is 100% of no way I could do this now. And heavier gear/boatanchors that 10 years ago were no problem for me, I need to rope in the assistance of my long-suffering wife. Craig
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26th Mar 2024, 1:50 pm | #22 |
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Re: Type 13A 'scope, full brightness on lamp limiter!
Can we stay on topic please.
Further off topic posts will just be deleted. Cheers Mike T
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Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk |
26th Mar 2024, 6:59 pm | #23 |
Dekatron
Join Date: Jul 2009
Location: Sleaford, Lincs. UK.
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Re: Type 13A 'scope, full brightness on lamp limiter!
With any old scope especially one of this age before powering it up I'd inspect it minutely looking for obvious burnt components, physically leaky caps, gone to air valves, wires off etc. I'd then check the mains fuse, test the power tfmr for shorts, test each electrolytic for leakage current, reform or change. I'd then re-seat every valve by jiggling it about a bit. Check all pots & switch's/clean, giving them a good jiggle back & forth.
While I doing all this I'd check a schematic/manuel so I have an idea of the power supply, EHT supply & potential divider that feeds the CRT. Check that too. Only after all this would I power it up on a variac & LL whilst chucking every meter I have at the power supply to check all the rails whilst powering it up. Andy.
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26th Mar 2024, 7:59 pm | #24 |
Heptode
Join Date: Jan 2009
Location: West Lothian, UK.
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Re: Type 13A 'scope, full brightness on lamp limiter!
If you don't still have a stock of 100W bulbs then wire a second holder in parallel with the first and use two 60s?
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27th Mar 2024, 9:37 am | #25 |
Dekatron
Join Date: Nov 2010
Location: Oxford, UK.
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Re: Type 13A 'scope, full brightness on lamp limiter!
Regarding the OP's budget for a Variac, it takes time and lurking on auction sites (not just the obvious eBay), but there are bargains to be had out there. Most I've paid was £60 for a boxed 5A one with meters.
Craig
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Doomed for a certain term to walk the night |
27th Mar 2024, 10:21 am | #26 | ||
Dekatron
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Re: Type 13A 'scope, full brightness on lamp limiter!
Quote:
Quote:
The 13A has a huge switch-on surge which is why you must fit anti-surge fuses or they just go bang. (Rather like big torroids like variacs.) Not sure how lamp-limiter gets on with that - but badly I suspect. |
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