Products > Test Equipment
Show Us Your Curve Tracer
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Electro Fan:
As discussed earlier in this thread, this project is showing a lot of excellent potential:

https://www.eevblog.com/forum/testgear/diy-curve-tracer-(analog)/
KungFuJosh:
I had a terrible experience with a popular tube curve tracer. As a result of that experience, I designed better hardware, and hired somebody to create new firmware. The result is what I'm calling the FUtracer (for obvious reasons if you're familiar with the one that pissed me off).



It's setup to test (from left to right):
12AX7 etc...
EF800 etc...
EF86
EL84
EL34/6L6/6V6 etc...

It can be setup for whatever tube types/sockets you want, but those are the ones I cared about, so that's what's on the tube pcb part.

Here's the Windows GUI:


Here's my ridiculous / overkill test I did. 301 points from Va 2 to 400, with 31 sweeps of Vg from 0 to -30:


Johnny10:
All the popular guitar amp tubes.
Cool!  8)

Can you switch between triodes?
Cubdriver:
That thing looks sweet!!  Very nicely done!

-Pat
KungFuJosh:

--- Quote from: Johnny10 on November 19, 2021, 01:36:04 am ---All the popular guitar amp tubes.
Cool!  8)

Can you switch between triodes?

--- End quote ---

There's no need to switch, it tests both triodes in dual triodes at the same time. Though technically you can switch between them on the plot tab in the GUI. You can show both Ia1 and Ia2, or show either. I'll take a new test and post it later, but this is what the plot screen looks like:




--- Quote from: Cubdriver on November 19, 2021, 04:26:08 am ---That thing looks sweet!!  Very nicely done!

-Pat

--- End quote ---

Thanks! I'm probably going to sell the PCBs along with the programmed PIC chip if anybody is interested. Though there are a few SMD items on there, so it's not a project for everybody. If there is enough interest, I might find an SMDA service that carries the parts I use, but I don't want to do it as a service myself. I do it well enough, but not well enough to charge for it. 🤣

Overall, it's not that expensive to build. The BOM on Mouser is about $180 or so with all premium parts, and I was thinking about selling the boards (main PCB, tube socket PCB, and a external PSU connection PCB) and programmed firmware chip for like $150 shipped in the US.

Thanks,
Josh
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