RoeTest, professional tube testing system, tube tracer

RoeTest - professional tube testing system  RoeTest  (Röhrentest)

     professional tube testing system  (c) Helmut Weigl

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RoeTest von Martin Forsberg V9

Martin sends me some pictures from his RoeTest V9















He sends me this email:

Dear Helmut,

I've finally finished the build of my Roetest V9 and it is calibrated good enough for me (I can't tweak the calibrations any more).

I've included a few photos of the outside and inside. The difference from your design on the outside is the two handlebars on each side (they let me turn it upside down without the banana plugs touching the table), the three tube pin straighteners and tube socket straighteners (the three handles with pins) and lastly the four fans mounted on an aluminium plate that is attached to the heat sink and controlled by the extra power supply that I put inside!

On the insides I have moved the mosfets so that they are connected by wires and they are also spread out more evenly on the heatsink to distribute the heat some more. I've included the power on timer on top of the power transformer and there is a large circuit board with three toroidal transformers, one for the fans and two in parallel for the +12V output connector - beneath this PCB I have also included one extra relay that switches the power to all of the output relay cards.

I made the hole above the front mounted rectifier bridge larger, approx 1cm wide, so that I could more easily access it if I need to remove the circuit board.

Making the extra circuit board on top for the extra 12V output and extra fan power took some time as it wasn't easy to cram all transformers and components on top and at the same time have access to the mounting posts so that I could screw it down securely, but in the end I succeeded on the first try with the PCB. It works very nice and only has linear regulators, LT1085/86CT types.

Now I get enough power to my external adapters without an external power supply.


Kind regards,

Martin