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 Post subject: Hickok 455 VOM overload relay
PostPosted: Sep Fri 01, 2017 3:00 pm 
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Location: Littleton, MA
My new-to-me Hickok 455 VOM is missing the reset button for the overload relay, and possibly some other parts of the mechanism.

Here's a picture of a 455A from Steve Johnson's site, with the red reset button:
Attachment:
hickok-455.jpg
hickok-455.jpg [ 90.51 KiB | Viewed 667 times ]

Mine is a 455, not a 455A. I don't know what the differences are.

Edit: Actually mine is a 455A.

Can anyone supply some detailed photos of the overload relay button and mechanism? I intend to try to fabricate a replacement, but I don't see how the latch works on the overload relay mechanism. I can lift the armature with a screwdriver and the contacts mate and the meter starts working, but it doesn't latch. I guess the reset button is part of the latching mechanism.

Here's a picture of mine. The black domed aluminum post is the inner part of the reset button. The red plastic button fits over it and couples to the overload relay armature through the semicircular slot in the top of the dome. You can just make out the slot in the photo; it's the shiny part in the center of the dome:
Image

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 Post subject: Re: Hickok 455 VOM overload relay
PostPosted: Sep Sat 02, 2017 5:57 pm 
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Joined: Jun Sat 09, 2007 8:14 am
Posts: 3278
Location: Florida
I can't help with the button but why do you suppose they decided to build it upside down?

RRM


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 Post subject: Re: Hickok 455 VOM overload relay
PostPosted: Sep Sat 02, 2017 7:28 pm 
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Retired Radio Man wrote:
I can't help with the button but why do you suppose they decided to build it upside down?

The photos are a bit deceiving. The 455 is designed to lay on its back, with the meter on a sloping front panel and the range switch on the top. That design is what attracted me to collect one --- I've been trying to resist starting a Hickok collection, but I couldn't resist this one.

RCA apparently resold it as their model LM-10

Here's the catalog description, again from Steve Johnson's excellent site:
Attachment:
455-cat 800.gif
455-cat 800.gif [ 115.94 KiB | Viewed 628 times ]


The case description is hard to read in the shrunken ARF version above. Here it is excerpted:
Attachment:
455-cat case.png
455-cat case.png [ 71 KiB | Viewed 628 times ]

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 Post subject: Re: Hickok 455 VOM overload relay
PostPosted: Dec Fri 08, 2017 6:32 pm 
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Joined: May Wed 18, 2011 2:40 am
Posts: 3395
Location: Littleton, MA
stevebyan wrote:
Can anyone supply some detailed photos of the overload relay button and mechanism? I intend to try to fabricate a replacement, but I don't see how the latch works on the overload relay mechanism. I can lift the armature with a screwdriver and the contacts mate and the meter starts working, but it doesn't latch. I guess the reset button is part of the latching mechanism.

Bump. Does anyone have a 455 who is willing to open it up and take a few photos?

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 Post subject: Re: Hickok 455 VOM overload relay
PostPosted: Dec Sun 10, 2017 4:17 pm 
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Joined: Nov Wed 30, 2016 7:35 pm
Posts: 1454
Location: Sunbury, Ohio 43074
Quote:
I've been trying to resist starting a Hickok collection, but I couldn't resist this one

RESISTANCE IS FUTILE! See Below. Then RUN. Yep, I am an addict. If you note some duplicates, you're not seeing double

OS-8
OS-10
Model 17
OBQ-3
580
539B
SG4800
799
752
580A
I-77B
540
510X-530-550X
KS-8325
OS-10
198
AC47A
209-C
900B
900
435
215
656XC
750
620
225
615
209
650
610A
288X
209A
209A
305
RFO-5
180-S
650C
KS-15874-L2
Cardmatic
660
145E
288x

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He who dies with the most sheer tonnage of ancient test gear, wins!


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 Post subject: Re: Hickok 455 VOM overload relay
PostPosted: Dec Sun 10, 2017 6:22 pm 
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Joined: May Wed 18, 2011 2:40 am
Posts: 3395
Location: Littleton, MA
stevebyan wrote:
Does anyone have a 455 who is willing to open it up and take a few photos?

Thanks to R_Dubb I've got some photos, but unfortunately you can't get a good view of the latch mechanism without disassembling it :-( I guess I'm in the market for a new one, or at least a red button.

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