[GreenKeys] 2 1/2A SCREW IN FUSE

Sat Aug 12 15:41:49 EDT 2017

I have taken the blown fuses, torn the cap off, and used the body to 
make an adapter for a cartridge fuse holder. If you look for the kind of 
fuse holder with the spring in the cap so the terminals don't move when 
the fuse is installed, you can secure it in the old fuse base with 
epoxy. It opens up a far wider choice of fuses. Motors blowing fuses 
brings up another concern - design voltage. If the synchronous motors 
are designed for 110 or 115 volts at 60 cycles, the common 120-125 seen 
today in many places can certainly cause over current and overheating. 
The smaller  motors in the newer machines and the Mite are designed to 
nearly fully saturate the magnetic structure in the motor, and a few 
volts over rating can send the current very high. Even the larger motors 
in the model 15 and 19 can be overheated to a lesser degree. The 
governed motors should not be affected by this rise in voltage.

      Bruce Gentry, KA2IVY

On 8/12/17 3:20 PM, drlegendre . wrote:
> I can certainly understand why one might want to have at least one 
> correct, original fuse for completeness' sake, but I can't imagine why 
> you'd want to actually +run+ these old fuses when it's so easy to 
> adapt a cheap, modern AGC-type glass cartridge fuse.
>
> Should something go wrong, I don't see the point in burning through 
> costly / NOS / vintage fuses.  It's also much easier to temporarily 
> up-rate the fuse for diagnostic purposes.
>
> On Sat, Jul 29, 2017 at 6:49 PM, <hwhall at compuserve.com 
> <mailto:hwhall at compuserve.com>> wrote:
>
>     I mentioned that my local surplus store has a lot of those types &
>     offered to check the amp ratings in stock &prices. Might be able
>     to beat the e-pay price & the $8 postage but no one asked.
>
>     Wayne
>     WB4OGM
>
>     -----Original Message-----
>     From: Thomas Tillson via GreenKeys <greenkeys at mailman.qth.net
>     <mailto:greenkeys at mailman.qth.net>>
>     To: greenkeys <greenkeys at mailman.qth.net
>     <mailto:greenkeys at mailman.qth.net>>
>     Sent: Sat, Jul 29, 2017 7:10 am
>     Subject: [GreenKeys] 2 1/2A SCREW IN FUSE
>
>     I think there was a discussion on these before and I happened to
>     come across these on the e-pay place:
>     http://www.ebay.com/itm/F14B-125-2-1-2A-SCREW-IN-FUSE-NEW-OLD-STOCK-1-box-of-5-PCS-/290980452933?hash=item43bfc95a45:g:YIsAAOxyAc1SOfla&autorefresh=true
>     <http://www.ebay.com/itm/F14B-125-2-1-2A-SCREW-IN-FUSE-NEW-OLD-STOCK-1-box-of-5-PCS-/290980452933?hash=item43bfc95a45:g:YIsAAOxyAc1SOfla&autorefresh=true>
>     No connection.
>     Tom Tillson
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