On Tue, 16 Jul 2013 17:50:00 -0600, David DiGiacomo
>> Was it the pushbutton switches which they kept in
later plug-ins or
>> the relays? I imagine those relays were expensive
which would be
>> another reason to get rid of them.
>I'm not sure what you are saying, but the white relays
were used in
>the 7A13 for a long time after the 7A12 was gone.
The 7A13 "pull for x10 Vc" function would require another
input attenuator to implement without relays.
I am just suggesting that Tektronix made more effort to
stop using the
relays than to stop using the pushbuttons. I remember
seeing a price
list somewhere showing that Tektronix was OEMing the
relays for a
price in the $50 range until alternative products became
After a certain time, it seems like the 7A13 was the only
>Also, there are lots of other plugins (and mainframes)
>the lamps is no fun at all. Soldering incandescent
lamps just seems
>like a bad idea.
I think the only problem is easy access which as has been
is a major problem in many cases. My 7A12 needs new bulbs
The on flakey pushbutton switch that I need to repair is
on my 7T11A.