Crow Bar SCR

[John Farrington]

On 3/12/04 Dale Jones wrote:

>Seeking information ,,where can I purchase the Crow Bar,  SCR NL576A for my
>HP1144A
>
>Thanks Dale AA7XX
----------------------------------------------------------------------


It's used to blow the 20 amp fuse in the DC output line;  I believe it's
just a 35 amp  1/4" stud-mount SCR, and many SCRs rated at 35A or higher
can replace it if they'll fit on the board.

eg:  NTE 5542 (35 amp)    NTE 5567 (80 amp)

The short terminal is the gate, the long is the cathode, and the stud is
the anode.

NTE does not list a direct replacement, probably because its an obsolete
part, but you can get to an NTE equivalent via other cross-reference sites:

Dale Wentz's page at  http://www.d8apro.com/heath3.htm

crosses the NL576A to a SPS135, which NTE does not list, but another
web site with a cross-reference page crosses that to the 2N3896:

    http://www.hutsonind.com/crossref.shtml

and NTE crosses that to their NTE 5542.   NTE lists their distributors at

http://www.nteinc.com/NET_St_lst/Disty.html

Also, Mouser in Texas  http://www.mouser.com

has the 5542 as their part #
<http://www.mouser.com/index.cfm?handler=displayproduct&lstdispproductid=313593&e_categoryid=131&e_pcodeid=52619>526-NTE5542
for $9.63.

73

John    KE5ZB

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