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6s33s on uTracer
6s33s on uTracer
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Old 17th June 2018, 05:54 PM   #1
victordascalescu54 is offline victordascalescu54  Romania
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Default 6s33s on uTracer

Hi guys,

I had just done my first test with 6s33s on my u-Tracer using obviously external DC PSU.
I set mesurments for 120V at 150 mA, -45V Ug1.
The curves seams to be nice but doing the fast testing, I was not abble to set plate resistance (120ohms) and target mu(amplification factor) so obviously errors occure especialy for gm which for me is the criteria in matching those tubes.

What shall I do?
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Old 22nd June 2018, 07:17 AM   #2
victordascalescu54 is offline victordascalescu54  Romania
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Some pictures of my tracer:
Attached Images
File Type: jpg utr 11.jpg (144.4 KB, 62 views)
File Type: jpg utr 41.jpg (113.1 KB, 61 views)
File Type: jpg utr21.jpg (139.8 KB, 63 views)
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Old 22nd June 2018, 08:12 AM   #3
jazbo8 is offline jazbo8
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6s33s on uTracer
Did you ask Dr. Dekker for a solution?
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Old 22nd June 2018, 08:47 AM   #4
victordascalescu54 is offline victordascalescu54  Romania
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I've asked Ronald, but no answer yet. He allready encuraged me to use a lower Ia /Ua point in order to be under the limitations of te unit.
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File Type: jpg 6C33C S.jpg (62.9 KB, 52 views)
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Old 22nd June 2018, 09:06 AM   #5
jazbo8 is offline jazbo8
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Wow, the differences are quite large! What happens if you put them in the actual circuit, do the current really differ by that much?
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Old 22nd June 2018, 09:29 AM   #6
victordascalescu54 is offline victordascalescu54  Romania
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Quote:
Originally Posted by jazbo8 View Post
Wow, the differences are quite large! What happens if you put them in the actual circuit, do the current really differ by that much?
This is only one tube at difrent Vg (-50, -46, -44 V) and the corespondent gm(see the doted curves.
Prior to finish that tracer, I use a primitive banc to check al the tubes I have at the actual OTL values (150V, 200mA, -50V) and the result was promising
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Old 22nd June 2018, 03:25 PM   #7
jazbo8 is offline jazbo8
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Ah, I missed the gm scale on the right - I thought you were comparing/matching two tubes. From the above table, it seems that you have several sets of tubes that you can use.
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Old 24th June 2018, 08:00 AM   #8
victordascalescu54 is offline victordascalescu54  Romania
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I am preparing to check better with the u-Tracer but I have to learn more the capabilityes of that engine.
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