[Boatanchors] Inexpensive Scope Probes

[J. Forster]

Any of the 4xx Tek portables are good choices. If possible go for an A or
B version. I'd stay away from the 485s because they use very high CRT
voltages and are prone to HV failure.

If you have more space, a 77xx; 78xx; or 79xx are going pretty cheap these
days. You will need 7A26s and a sweep like a 7B53A. They are pretty common
and cheap these days. Stay away from 71xx.

I'd stay away from 22xx and 24xx Teks. They have very unobtanium parts.
Also, stay away from 11xxx and the early all digital scopes.

-John

================



> I have 2 Tektronix 475 scopes for over 20 years and they work just fine,
> 200
> MHz bandwidth.  The model 475A has 250 MHz bandwidth.  The 465 is the
> little
> brother to the 475 but the bandwidth is only 100 MHz and the sensitivity
> is
> only 5 mv/div instead of the 2 mv/div with the 475, otherwise they are
> very
> similar.  The lowest sensitivity is 50 V/div and with a 10X probe it would
> be 500 V/div but you should make sure you do not exceed the probe voltage
> rating.  Tektronix sold a lot of the 465-475 series of scopes.  My main
> scope is a 7904 with 4 plug-ins with one going to 500 MHz and I use a 900
> MHz FET probe with it.
>
> Mike W6MXV  in KY
>
> ----- Original Message -----
> From: "Ian Wilson" <ianmwilson73 at gmail.com>
> To: "BOATANCHORS" <boatanchors at mailman.qth.net>
> Sent: Wednesday, February 09, 2011 1:22 PM
> Subject: Re: [Boatanchors] Inexpensive Scope Probes
>
>
>>A scope is indispensable for any kind of RF work in my humble opinion,
>> provided that you use common sense and don't look for high frequency
>> detail with a medium frequency scope.
>>
>> You can align receivers, check oscillators, verify transmitter stages,
>> and uncountably many other useful things, with even a modest scope.
>>
>> Unfortunately my BK 35MHz scope is dying. Can someone recommend
>> a 200MHz scope for general use? Budget is very limited. Scope should be
>> able to handle tube-type voltages with no strain.
>>
>> 73, ian K3IMW
>
>
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