June 30, 2019 - 06:32 pm|
|Very nice article. Excellent source of information.|
I've build one on these UTracer and I am very please with it.
It works great for most tubes with decent emission.
However, for low current tube, typically 12ax7 with a static emission lower than 0.3mA, the gm and mu values are totally off, compared with a MaxiPreamp tester.
This is a problem for me.
June 14, 2019 - 05:37 am|
|Hi Josh, Your implementation of the µTracer looks really nice! Thanks for the link and tips for using the Bluetooth and USB modules. |
June 14, 2019 - 05:27 am|
|Hi Steve, I like your tube tester! One thing I would consider is using USB and Bluetooth instead of the serial port connector. I have my uTracer working with both.|
You can see my tips here: https://www.dos4ever.com/uTracer3/uTracer3_pag9.html
Search for “2018 Josh” and the notes with photos of my build will pop up. You’ll see I also designed a regulated power supply so I can use it with an IEC socket.
June 06, 2019 - 06:01 am|
|Well, I have the M107 too but use it rarely. For tubes there is not enough current capability. As heater supply for the uTracer I use the model PL550-1 Trygon. Max current is 1 A not sufficient for big tubes. There I have other power supplies when necessary. |
June 05, 2019 - 06:47 am|
|Hi Sven, That seems like a great way to power heaters for the µTracer. Doing a quick search for Systron Donner precision lab supplies turned-up the M107 here, so I see that they made some very impressive supplies! Thank you for your kind comments. |
June 05, 2019 - 05:03 am|
|Hi Steve, excellent well done work. As also owner of the uTracer I made it simple and use an vintage external analog linear DC precision lab supply from Systron Donner. This allows setting voltages precisely with digit indicating rotary switches down to mV range. There is also an indication meter for the heater current. Thus I can easily and precisely set the heater voltage to +- deviation in order to measure the tube quality under reduced and over heating. And, there is no problem measuring the voltage with a good DC voltmeter if necessary near the tube under test. |
June 01, 2019 - 05:58 pm|
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