uTracer

The µTracer, a miniature tube curve tracer The µTracer V2, a miniature tube curve tracer project The

Whatever works, that's all that matters. 😉 On Fri, Aug 29, 2025, 11:58 AM Carlo Tonazzi <

Try 100k for R1, 1M for R2, and 4k7 for R3. The transition should then be from 1M to 5M. On Wednesday

In traditional tubes tester it's common to use 50v for testing tubes on leakage. Also a cold or

Thank you for the feedback, Bob. And thank you for the head-up on the extra protections: I will add

Maybe do a calibration test to see if all is okay… Maybe check if the +5 & +15v supply is working

Finally the matrix board works with switching presets! Nice job Ihor! Hopefully the shorts/leakage

Tom My personal experience with the utracer6... Problems with COM issues when using a direct connect

That's where I was going with the third question: How are the matched pairs chosen and by what

Ihor Thank you for the tips and screen shot on using uTracerJS. There is a lot of functionality I

I apologize if this has already been covered. Are ferrite beads recommended for heater leads on a

I assume this is pin #1 of the positive grid voltage extension card you refer to. 1) This circuit

I find the uTracer such a good tool that I have forgiven a number of shortcomings it has. One of

PS, on Ronald's web site he says: "The dimensions of the board are exactly 6x6 inch, or

Eliad said " I started the calibration and it gets stuck at applying anode voltage" I my

Thanks. There's a lot of wacky tubes out there! On Sat, Nov 23, 2024 at 8:09 PM GEK <gekaufman

We are lucky to have you Bob! Because of your background in the electronics, you know all about your

If you can you can touch it it's ok! If shorted they can get 90/100 degrees Celsius in 10 seconds

Leonard Great to hear you found it and happy I was of some help. Bob On Tuesday, October 22, 2024 at

Here are the details of the changes I made to my utracer6 to improve low voltage high current

Today parts came in and I started modding my Utracer6 for lower losses, lower droop and increased

Josh I too have moved in the last 18 months. You never find everything again. Thanks for letting me

Working fine now. Thanks for your dilligence! On Thursday, September 5, 2024 at 3:15:01 PM UTC-4 Ihor

I finally figured out the problem, at least the part of it and found the way around. So the latest

Ihor It seems clearly steeped in history that only two of three data streams can be plotted on

Thank you for your thoughtful comments. In fact, I found boxes in my attic with about 250 tubes from

What an experience! I am glad that in the end everything is up and running again. Indeed, it is

Ihor Re:" Va = VaHEX * 5.0 / (1024.0 * anodeDivR1 * calVaGain) * (anodeDivR1 + anodeDivR2) *

I'll have to look at it tomorrow though! It looks like I'm missing the point Interesting

I cannot edit my post. I meant to say I'm getting "approximately -2.8v in stead of -50v

Double check your connections between the board and tube socket. Don't forget that tube pins are