[ARC5] Oscope Fixed!

[Tom Lee]

Congrats on the repair!

Do you have a link to a datasheet for the NTE multiplier you used? I'd 
be curious to see how much it differs from the stock multiplier you 
replaced. That price sure is pretty attractive, in any case.

As to a series resistor, it won't do much good. Also be aware that 
ordinary resistors arc over with a few hundred volts across them. HV 
resistors are physically long to distribute the total voltage over a 
large distance to keep the peak field below arc-over threshold.

The Tek scopes all regulate the HV, so as long as the multiplier factor 
is close to (but no smaller than) the original, the voltage should come 
out fine. (Assuming the feedback pickoff point is not at some 
intermediate position in the multiplier chain.)

--Cheers,
Tom

-- 
Prof. Thomas H. Lee
Allen Bldg., CIS-205
420 Via Palou Mall
Stanford University
Stanford, CA 94305-4070
http://www-smirc.stanford.edu
650-725-3383 (public fax; no confidential information, please)

On 4/2/2018 11:04 AM, Robert Eleazer wrote:
> Well, guys, this morning I completed fixing the Tektronix 2236 I have 
> been working on. I still have to run some tests using a signal 
> generator but the trace appears bright and stable and the digital 
> display is up and running.
> I robbed the voltage multiplier out of a 2225 and had to get create on 
> how to mount it, but finally succeeded.
> Next, I bought an NTE voltage multiplier that was on sale for $4.50, 
> and while I could not cram it in the 2236, it appears rather easy to 
> mount it in the 2225. So I am going to give it a try.  I think I'll 
> put several million ohms in the anode lead in case the voltage 
> multiplier is running a lot higher than the original one.
> By the way, http://ntepartsdirect.com/ has some good prices and 
> reasonable shipping charges for small purchases (e.g., $4.50).
> Thanks!
> Wayne
> WB5WSV
>
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