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Telequipment CT71 TO-66/TO-3 Test Fixture

 

Hello,

I am looking for the TO-66/TO-3 combination test fixture for the Telequipment CT-71 Semiconductor Curve Tracer.

If I can't find one I would also like to have internal and external pictures of one so I can make one. The pictures I have found on-line are inadequate and the schematic
in the manual does not show either of the two fixtures that came with the unit. I do have the TO-5 fixture and note that there are componets under the bottom cover of the
fixure so I suspect tha the TO-66/TO-3 fixture may be similar.

The Tek part number for the fixture is:

013-0119-00

Thank you very much,

Sam
W3OHM
 

Annoyingly, any CT-71 test fixture seems impossible to find.

On Sun, 2 Feb 2025, 23:04 Sam Reaves via groups.io, <sam.reaves=
[email protected]> wrote:

Hello,

I am looking for the TO-66/TO-3 combination test fixture for the
Telequipment CT-71 Semiconductor Curve Tracer.

If I can't find one I would also like to have internal and external
pictures of one so I can make one. The pictures I have found on-line are
inadequate and the schematic
in the manual does not show either of the two fixtures that came with the
unit. I do have the TO-5 fixture and note that there are componets under
the bottom cover of the
fixure so I suspect tha the TO-66/TO-3 fixture may be similar.

The Tek part number for the fixture is:

013-0119-00

Thank you very much,

Sam
W3OHM
 

Hi:
I am using CT-71 currently!
I may take some pictures for your references.
Rd
Tony Cheung
Feb 3 2025
从我的颈笔丑辞苍别传送

Dave Voorhis via groups.io <voorhis@...>於2025年2月3日 17:15寫道：

?Annoyingly, any CT-71 test fixture seems impossible to find.

On Sun, 2 Feb 2025, 23:04 Sam Reaves via groups.io, <sam.reaves=
[email protected]> wrote:

Hello,

I am looking for the TO-66/TO-3 combination test fixture for the
Telequipment CT-71 Semiconductor Curve Tracer.

If I can't find one I would also like to have internal and external
pictures of one so I can make one. The pictures I have found on-line are
inadequate and the schematic
in the manual does not show either of the two fixtures that came with the
unit. I do have the TO-5 fixture and note that there are componets under
the bottom cover of the
fixure so I suspect tha the TO-66/TO-3 fixture may be similar.

The Tek part number for the fixture is:

013-0119-00

Thank you very much,

Sam
W3OHM
 

Thank you Tony. I appreciate your efforts!

Sam
 

Hi Sam :I had created the album " CT71 adaptor on TekScope. please check !
RdTony CheungFEB 4 2025

On Tuesday, February 4, 2025 at 02:58:04 AM GMT+8, Sam Reaves via groups.io <sam.reaves@...> wrote:

Thank you Tony. I appreciate your efforts!

Sam
 

The "unknown" components inside curve tracer transistor test fixtures are likely lossy ferrite beads (anything from one to a bunch in series) to suppress oscillations in actively biased devices. At low frequencies you want to make the series Z from the DUT terminals to the measuring ports as low as possible, so direct wires are best.

You can build your own fixtures and jigs with simple wiring, then if any oscillations show up, add some beads as necessary to calm things down. It depends on the types of devices tested - RF transistors will need different treatment from audio, for instance.

Ed
 

WOW Tony Thank you very much.

With the pictures I got from you and the TO5 one I have I think I can 3D print a facsimile of the one that you have.

I bought the curve tracer 20+ years ago at a hamfest for $10.00 and I recently got around to fixing all of its problems and calibrating it but I never had any luck finding this fixture.

The TO5 fixture has resistors where the TO3/TO66 fixture has ferrite beads and that was what I was concerned about and your work helped me answer that question.

Thanks again!

Sam
W3OHM
 

Hi Ed,

Well I was aware of that and I wanted to see what Telequipment had done as my TO5 one has resistors and now I know that the TO3/66 one had ferrite beads.

I have a bunch of 43 material ferrite beads so when I get to building the fixture I'll try that first. I'll start by testing some epitaxial transistors first and see how that goes.

Thanks for chimeing in!

Sam
 

Tek has similar for 577, 576, 7CT1 tracers

Jon
 

Unfortunately those fixture will not fit or work with the CT-71 and they
sell for big $$.

Sam Reaves
ARS W3OHM

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