Hi Attila,

these old TEK scopes are simply great! I agree.

I have some myself, so maybe I can give some advice in this respect...

AFAIK, the 540 series had all of the plugin units called something with
letters.

The other variant of this were the so-called "2" and "3" series.

The series differ in size, so one unit won't fit in a scope it is not
designed for.

As the 7L series will fit the 540 series, i assume that there were other
plungins for this series using numbers...
...so if it fits, it should be the correct series...
You might check if the heater voltage and the 300 V and so on are
located on identical pins on both plugins, for a check.

I have a 585, a R561A, a 561B and plugins (among others) 3S76 and 3T77 -
these do 850 MHz, sampling!

Greets

Jochen Feldhaar DH6FAZ

Attila Muhi schrieb:
>
> Hi
>
> I've got an old Tek scope (547), and still use it. It has plug-in modules for the vertical amplifier. Normally I have a "Type CA plug-in" installed, dual-trace, about 20MHz BW. When searching the attic, I found another one of these modules (Type 81 plug-in adaptor) with a front label (Type 53/54C plug-in unit). It looks the same as the Type CA, but mustn't it be some difference ?
>
> Is anyone on the list familiar with those old Tek scopes, or can you point me to a good info source ?
>
> Regards
>
> Attila - SM4RAN
>
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