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Old 22nd March 2013, 12:40 AM   #11
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I got the Quan-Tech box today. The interface module is definitely for Quad opamps, so I'll have to trick it out to handle 3-legged critters as well.

No cables came with the box. I suspect the interconnects might use shielded ribbon cable, but I'd like some confirmation if that is true... I need to know, as it looks I'll be stuck putting my own cables together.
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Old 22nd March 2013, 12:55 AM   #12
1audio is offline 1audio  United States
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Mine came without a cable as well. A trip to Halted solved that issue. Shielding is not necessary since the signal level is quite high across the wire.

The module under the lid unplugs and that's where you plug in the transistor fixture. You may need several for different pinouts, or bend the pins which is what I do. My transistor fixture is rigged for N Jfets for now. The space is pretty small but it may be possible to kludge a pair of switches for different pinouts and two transistors in that space.

I have a really low noise Jfet that came from Quan-Tech for checking the calibration.
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Old 22nd March 2013, 05:03 AM   #13
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Right, so we're talking about your usual fiat cable with insulation displacement connector - easy to manage. The fixture for the quad-opamp ic on the interface box is indeed easily removable via an improvised edge connector - food for thought.
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Old 22nd March 2013, 05:08 AM   #14
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When you are getting the cable (Mine is 18" long) grab a few ISA boards to chop edge connectors off of. I found a few with through holes next to the connector that worked perfectly. I used a right angle .025" pin header to connect to the board that held the test sockets.
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Old 22nd March 2013, 05:51 PM   #15
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I've scanned the manual but (not the best resolution...) I don't know how to get it to you (I didnt see any attach options via the email or pm contact) ?

Thanks
-antonio
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Old 23rd March 2013, 03:52 AM   #16
RNMarsh is offline RNMarsh  United States
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go to below and click on Go Advanced. then go to the paper clip symbol on the top line. It will bring up a brouser to find your scan and upload it.
Then go back to your message and click on the same paper clip and then you will find your scan... click on it and it will appear in your message.

-RNM
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Old 7th November 2013, 04:17 AM   #17
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So this is Mr. Watt Sucking Fireball at UpstairsAmps and I have two of these 5173's, one with the transistor adapter and one with a single 741 type pinout op-amp fixture. I would be interested in seeing the Quad op-amp fixture if we could get together. I'm planning on having blank module assemblies made up to facilitate testing everything and would like to see if there is any hidden trick to the quad. The single op-amp fixture is configured as a non-inverting gain of 20db and driven with the calibrate oscillator on pin 6 of the connector. I'm interested in whether the quad is set up with each amp having a resistor pair on each amp as well. the resistors on the single fixture are 100 ohm inverting input to ground and 909 ohm inverting input to output. 20 db non-inverting gain
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Old 7th November 2013, 04:57 AM   #18
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The quad opamp fixture is really simple. The mechanicals of the fixtures is the pain. For the quad the plus input pins are all tied together and each output has its own feedback resistors with the outputs tied to each output pin on the connector. Add power supply bypass caps and you are on the air.

I used edge connectors chopped from old ISA cards for the connector. It will have the right pin spacing. Dealing with the right angle connection is more of an issue.

I could stop by on my next trip to San Jose and review my experience if you want.
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Old 7th November 2013, 06:02 AM   #19
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I'd be up for some comparative viewing of test fixture innards - I haven't had the time to crack the lid on mine, as I've been struggling to finish a lot of other outstanding projects. However, I'd eventually like to set up my fixture to somehow accept 3-legged critters, as I have a lot of new/NOS jfets (and a few mosfets) that I'd like to screen for noise.
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Old 9th November 2013, 06:41 AM   #20
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Default 5173

OK, so I figured out the secret of the conversion of a single op-amp test fixture to accomodate a dual as well. Came up with the conclusion you illustrated. plus in's tied together, 20db of gain on each amp using a 100 and 909 ohm resistor in the neg in. and a couple bypass caps. also had to add a switch to only connect a couple leads for the dual case, so it has a switch now for single or dual parts. I have a FET/Transistor adapter for the other one. For the record there are some Quan Techs here : two 5173's one 2173 with trans and IC heads, a 310 trans unit a 312 FET unit and a resistor noise unit. When I was working with Stansbury on a guarded remote for vacuum triodes I learned from him an odd phenomenen regarding the 5173 head. You cant put it on top of the readout or it causes a noise increse bump in the 1KHz readout. the head is always at ease to the left of the readout or on another plane. He thought there was a possible loop current caused by the capacitance between the two chassis and the circuit sensitivity would see it. I was able to improve the cable by wrapping it with copper screen and grounding it at both ends. Cell phones wreak havok on the readout and so should be as far away or turned off when making measurements. I have the 5173 on a copper clad bench and an isolation transformer to the AC so the chassis can be made common mode to the test bench alone. Heavy Duty Aluminum foil bonded to a bench top with contact cement or double sided sticky tape works as well. The Iso helps a lot when ultra low noise parts are being tested. Thanks for the sanity check on the Quad amp fixture, one check point is always a good thing.
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