Very interesting, Lon. Nice work!
73,
Jim w8zr
Sent from my iPhone
> On Dec 19, 2022, at 9:32 AM, K5jv <k5jv@kingwoodcable.com> wrote:
>
> Greetings to all,
>
> After a long search for a replacement for the push-button switches in
> my Alpha 78, I thought I had found them at, of all places, Walmart. You can
> not just go pick them up. You must order them online. After a three week
> wait, the switches finally arrived. They are the modern version for the
> Alpha switch, but not an exact replacement for the 50 year old switches.
> However, the internal switch contacts in the new switches are exact
> replacements for the contacts in the old switches. These new contacts appear
> to be silver ( at least in color) plated. The contacts in the old switches
> appear to be made of copper, or bronze, and, in my case, were badly pitted
> from nearly 50 years of use.
>
> The new push-rod will slide into the old switch body but will not
> larch properly. Two tiny contacts and springs are attached to the internal
> push-rod. The springs and contacts must be removed from the new push-rod and
> installed on the old push-rod. Do not cut any wires. Do not remove the small
> circuit board attached to the bottom of the switches. Just remove the
> meters. The entire switch assembly can then be unscrewed from the chassis
> and rotated up through the meter hole for relatively easy access.
>
> It is not an easy job, in fact, it was a very meticulous job for me.
> If I can do it at 81, you youngsters should have no trouble. It might take a
> little practice and I suggest you get a magnet on a stick to retrieve the
> tiny springs that will shoot all over the room. Be careful, the springs are
> magnetic, the contacts are not.
>
> The project is really worthwhile. After several hours of quite
> meticulous work, the multi-meter switches on my Alpha 78 works like new
>
> 73 de Lon, K5JV
> 281-795-1335
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|