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Old 20th July 2007, 10:28 PM   #11
Dr ZEE is offline Dr ZEE  United States
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setup shart window and switches
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Old 20th July 2007, 10:33 PM   #12
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the control panel of the unit. Sh*ty photo
so I've typed some titles
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Old 20th July 2007, 10:34 PM   #13
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inside stuff
(special / normal "N/S switch is under the transformer) actually to see anything or try to figure out the connections there I would have to remove the trnsformer and this is actually a big freakin' deal, simply because the way it is assembled, and I can not move the transformer without disconnecting all (or at least half of the leads) . I don't want to do that.
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Old 20th July 2007, 10:40 PM   #14
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another inside view,
well, guys if any idea of what ever, I will appreciate your time and expertise.
/massive respects
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Old 20th July 2007, 10:54 PM   #15
kevinkr is offline kevinkr  United States
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On the roll chart referring from left to right you see FIL - set the filament voltage control to the filament voltage indicated.

Note that the row of switches above the chart are marked S G P K and each one has a pin number underneath it. There are 8 + GC. (GC stands for grid cap.)

Next on the chart you will see S, set the switch with corresponding number indicated in this column to S, if there is more than one number set all indicated numbers to this position.

Next is G, set switch with the corresponding number to G.

Next is P, again set switch with the corresponding number to P.

I believe that any switch pin number not mentioned in the chart should be set to K.

Bias value is next, read the number and set the bias control to the value listed.

Sensitivity is next, read the number and set the sensitivity control to the value listed.

AVGM is the nominal value you should read off of the meter. I'm assuming in most cases if you are in the green the tube will be ok.

I did not see any specific settings for filament pins so the tube types that can be tested are specifically limited to the types listed in the roll chart as I assume the filament connections are probably hard wired.

Pay special attention to the Notation section as there are likely in some cases to be additional information to assist in interpreting the result. This should also provide some additional setting information where required.


Circuit Selector:

**LV position on the circuit selector is for setting Line Voltage using the LV control - set this using the meter which is marked at the proper setting for line voltage. Do this before testing anything and adjust each time you use the tester or change tube types under test. Check this again with the tube installed and filament warm, adjust as necessary - with power tubes and rectifiers you might need to tweak this again before reading the final value. **

Rectifier - use this position to test rectifier diodes, press switch marked rectifier and cold K test - check meter reading. Do not hold longer than necessary to get the reading.

Cold K (Cold Cathode) use for testing gas regulator tubes like the OA2, VR75, VR150 etc..

Gm - this is the position to use to measure the transconductance

Shorts - interelectrode short test, use with labeled button, check notations. If there is a short the neon lamp will light. This may not be a reliable indication of shorts.


Try it only with tube types listed in the chart. Insert the tube only after the initial settings have been made.

This might not explain how to use all of the features in the tester, but it should allow you to get started. Hopefully I have not made too many errors in explaining how the tester works.

Nice tester by the way..
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Old 20th July 2007, 11:27 PM   #16
kevinkr is offline kevinkr  United States
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Noise jacks are meant to be used with high impedance headphones and allow you to listen to noise generated by the tube under test.
(Triodes, tetrodes and pentodes only!)
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Old 20th July 2007, 11:35 PM   #17
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Kevin! Thanks a ton. You're the man.

Now, what do you think the 1-8/GC switches should be as "starting point"...or the position of switches that are not in the chart for the tube? I thought it is "K". Or does it matter what position the switches are if they are not mentioned in the chart for the tube under the test? Is it a "stupid question" ...heh heh
The thing is , that this is THE QUESTION for me and that is why I said to myself: "I better try to figure it out befor inserting any tube here".
Now there is another "mystery" for me here. After I set everything as in the chart and check/set L.V. control and then so I am ready to insert the tube. So I suppose I would first have to go through "Short" test. So I switch from L.V. to "SH" and then what? What your guess would be. ? Just to see if the short-neon glows or do you think I should go through switching some switches, let's say to "S" position one by one and then return to "K"?
OK, Kevin, if my "questions" gives you headache, then just ignore it
I've found another photo I've made in the past while working on cleaning etc... that shows the ciruit selector, attachine bellow:
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Old 20th July 2007, 11:44 PM   #18
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Kevin, yeah, speaking of "noise". Any idea what phones can I try there? Do I need to shop eBay for some "special" phones from 50s Or what other options. Or is it even worth of trouble, meaning , practicality of "noise test"?

here's another photo closeup of the meter
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Old 20th July 2007, 11:45 PM   #19
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Set any of the unmentioned switches to K would be my guess. Will try to answer rest of questions tomorrow.

Short test is a good thing to do but not definitive.
Test is done with Gm setting..
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Old 21st July 2007, 03:48 AM   #20
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ok
armed by Kevin's wisdom I've got brave to go for it and try testing something.
So far things doing well, no smoke no fire
I am just going to sort of sum up step by step of what I've done, not to be taken as "instructions", but at least it's a start.
See attached photo. (The example is there 12AU7 (I've tested few of those)
Steps:
1(A). All 1-8/GC switches in "K" position, no set up. First just powered up the unit. Circuit Selector in L.V. position.
1(B). After few seconds of heating up , set up L.V. control to match the Line Level mark on the meter. Turned the unit OFF.
*****
2. Set N/S switch to "Special" as per chart for 12AU7
3. Set Filament selector to 6.3 as per chart for 12AU7
4. Set switches "S" - GC, "G"- 2, "P" - 1 as per chart for 12AU7 (first section)
5. Set Sensetivity Pot as per chart for 12AU7
6. Set Grid Bias as per chart for 12AU7
7. Insert the tube
8. Turn the unit "ON". Note: the Circuit Selector is in "L.V." position. Check L.V. on the meter.
Also as I turn the unit "ON" the under the test tub's filament is lightening up, so is "on"
9. Give a few seconds for the tube to heat up. Set the Circuit Switch to "SH" position. Now, here's a big QUESTION for me. Is it it? Just to see if the Neon glows or do I have to do some switching to do to check for shorts.
(As I understand before moving to "Quality Test" it is a good idea to make sure that the tube is OK for "shorts". So this is a grey area for me at the moment how to 'correctly' pass this sep on this tester.
The tubes I was testing were previousely tested on my Acurate Instrumets 257 emission type tester, so I assume that they are all OK, and so I moved on...)
10. Set Circuit Selector to AMP. position.
11. Read the meter.
I've got vary results (readings) on this tester when testing tubes, that were before tested "GOOD" on emission tester. Also readings on the meter were rather "High" comparing to what I would expect according to chart notes. As per chart for 12AU7 it is noted: AV.Gm-2000, my reading were somewhat between 2500 and 3000 (far right meter position).
So I am not sure what to make out of this. I guess interpreting the results othere than "good/bad" is the whole different story
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