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Old 4th Oct 2022, 10:19 am   #1
stephen_g
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Default Hickok type 81 fuse lamp.

Hello all,

Does anyone have any of the type 81 fuse lamps as used in the Hickok 539A valve tester please, or know of a supplier in the UK?
It is a single contact bayonet lamp BA15S base, GE part number is GE-25736-81.

Thanks

Stephen
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Old 5th Oct 2022, 7:50 am   #2
Kevin Hoyland
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Default Re: Hickok type 81 fuse lamp.

Morning Stephen.
The bulb that you are after is a car / truck bulb and that's all . But for years people in the USA say that if you do not use the right one the tester plays up. I am sure Lucas made one in the UK that is the same.
Kev.
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Old 5th Oct 2022, 9:06 am   #3
stephen_g
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Default Re: Hickok type 81 fuse lamp.

Morning Kev,

Thanks for your post, I'll keep searching!

Kind regards

Stephen
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Old 6th Oct 2022, 1:26 pm   #4
brunel
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Default Re: Hickok type 81 fuse lamp.

36 pages of BA15S lamps here.

https://www.cp-lighting.co.uk/Lamps?search=BA15S+
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Old 6th Oct 2022, 3:35 pm   #5
broadgage
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Default Re: Hickok type 81 fuse lamp.

The correct rating is important. Various sources give this as being 7 watts at either 6.5 volts or 7 volts.

Probably used as marker lights/side lights in USA. A more common rating in the UK is 5 watts.
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Old 7th Oct 2022, 4:41 pm   #6
usradcoll1
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Default Re: Hickok type 81 fuse lamp.

Quote:
Originally Posted by broadgage View Post
The correct rating is important. Various sources give this as being 7 watts at either 6.5 volts or 7 volts.

Probably used as marker lights/side lights in USA. A more common rating in the UK is 5 watts.
The #81 lamp was used in US c*rs pre 1956 as back-up and interior lighting and readily available in auto parts stores and garages. The lamps, at the time were rated 6-8 volts. It probably would be best to source US made lamps!
BTW, the fuse lamp glows rather brightly when testing high current rectifier valves, such as a 5U4 at inrush and glows slightly when valve is heated.
Dave, USradcoll1
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Old 8th Oct 2022, 3:54 am   #7
FrankB
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Default Re: Hickok type 81 fuse lamp.

Be sure the bulb height is the same as the one you are replacing.
I had one that was too high and would not fit properly.
If you can find an older U.S. made bulb it should work OK.
I bought a master box of 12 at the auto parts store for less than the price of a 2 pack on the peg board. But the glass was a bit too tall. Chinese import bulb. Also have heard of others where the bulb will not work properly due to current/ voltage differences in the import bulbs.
If I had a spare, I'd send you one, but I need a couple for my own T/T for spares. Hard to find even here.
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Old 8th Oct 2022, 7:25 am   #8
vidjoman
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Default Re: Hickok type 81 fuse lamp.

My list of US numbers from GE shows #81 as - #81 Bayonet Base 6.5 volts @ 1.02 amp
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