[Milsurplus] Repair of Tektronix 2335

[Kenneth G. Gordon]

On 11 May 2017 at 11:38, WA5CAB--- via Milsurplus wrote:

> 
> I have a Tek 2335 that has given good service for years and is still perfectly adequate for anything 
> that I need it to do.  Two weeks ago it was working fine.  I used it to fine tune a vibrator for a TBY 
> 4V supply, and proceeded to close up the vibrator.  When I went to run a final test on the repaired 
> vibrator, the 'scope had no trace.
> 
> I don't have the service manual on it, nor the time to fix it myself.  So I did a little searching and 
> came up with a company named Transcat whose local office is less that a mile from my house.  
> Their ads claimed that they worked on Tektronix equipment.  So I took the unit to them some time 
> ago, and they accepted it.  Several telephone calls later, I get an email from them saying that the 
> instrument is obsolete, unrepairable, and if I pay them $150.00 I can have it back unrepaired.
> 
> Does anyone know of anyone preferably in the Houston area but lacking that anywhere in the 
> USA who will actually fix it?

I did some research on this too, and cannot find a service manual for the 2335, nor for any 
others in the same "family", the 2336 and the 2337.

I can find operating instructions for the 2336YA, but that is not helpful in this case.

>From other information I gleaned, specifically here:

https://www.electronicspoint.com/threads/tektronix-2335-oscilloscope-repair.122289/

apparently that scope, a ruggedized military version, has some Tek-made specific parts in it 
which are pretty much unobtainable now.

There is also this:

https://www.electronicspoint.com/threads/tektronix-2335-no-trace-no-beam.53031/

which seems to describe your problem.

In his, the problem was centered in the HV module and the thick-film resistor associated with 
it.

I wish I could help otherwise.

Ken W7EKB

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