General > Buy/Sell/Wanted

Wanted: inexpensive analog oscilloscope

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tekfan:

--- Quote from: 12AX7 on January 06, 2012, 06:26:37 pm ---Tektronix 7854, eBay 230726277881, $200.

--- End quote ---


Don't buy it unless you have access to another oscilloscope and a logic analyzer. If this thing breaks it is a nightmare to fix.

And also seeing how most of the people here don't even have the space for their Rigol scope, I really don't know where they would put this beast.

But other than that it is a wonderful scope. 400MHz analog bandwidth, digital storage, modular plugins, what more could you ask for.

keiby.zhou:

--- Quote from: tekfan on January 06, 2012, 06:43:17 pm ---
--- Quote from: 12AX7 on January 06, 2012, 06:26:37 pm ---Tektronix 7854, eBay 230726277881, $200.

--- End quote ---


Don't buy it unless you have access to another oscilloscope and a logic analyzer. If this thing breaks it is a nightmare to fix.

And also seeing how most of the people here don't even have the space for their Rigol scope, I really don't know where they would put this beast.

But other than that it is a wonderful scope. 400MHz analog bandwidth, digital storage, modular plugins, what more could you ask for.

--- End quote ---

hi Tekfan, How about the 453 i bought?  is it easy to fix if something went bad?

i saw some of your posts on bringing dead scopes back to life,,, very encouraging :)   Thanks for your sharing

tekfan:
This should be one of the easier scopes to fix. Everything is discrete. No integrated circuits. This was the time (late 60's to early 70's) when Tek was coming out of the tube era and going into the transistor era. This scope is mostly transistorised apart from six 8393 nuvistor tubes (one on each channel input, 2 in the A and 2 in the B sweep generator).
There are also two 5642 rectifier tubes in the HV power supply. The tubes last very long so you shouldn't worry about replacing them.

The only thing that might be hard to come by are the four tunnel diodes in the trigger circuits. They are 4.7mA tunnel diodes.
You can probably substitute them with russian tunnel diodes that can be found on ebay. But again they very rarely fail. Whatever you do don't measure them with an ohmmeter or multimeter on diode check function. Check the tekscopes yahoo group for successful substitutions.

All in all this should be a pretty nice scope.

alm:
Didn't they change the nuvistors to FETs sometime in the 453's life before the 453A came out?

tekfan:

--- Quote from: alm on January 06, 2012, 10:26:54 pm ---Didn't they change the nuvistors to FETs sometime in the 453's life before the 453A came out?

--- End quote ---

Looks like they did replace them with FETs in the later models. (the two metal can devices in the white socket)

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