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NEW: Superior TV-11 Tube Tester
vecher
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#1

09-20-2016, 01:08 PM
All, I just acquired this tester.

[Image: http://i292.photobucket.com/albums/mm38/...adi13e.jpg]


It was working as advertised. However I noticed that most if not all the tubes I tested were measuring the same. So I took it out of cabinet . Noticed some repairs were done , new caps a couple of new resistors. ETC.. I decided to measure the filament voltage to see if it was correct.. The manual says to use the line adjust to set the meter at the Line adjust position. When I did that the voltage was low. I was using the 5 volt position. It measured around 4.7 volts. When I put in a 5Y3 tube it could barely be set back to the Line adjust position. It measured around 4.6 volts.. could not get it any higher..

Here is schematic..

[Image: http://i292.photobucket.com/albums/mm38/...b9dhwt.jpg]


More to follow..

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morzh
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#2

09-20-2016, 01:14 PM
Is the 250 Ohm potentiometer still 250 Ohm? And is the voltage select switch clean?
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vecher
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#3

09-20-2016, 04:13 PM
Funny you should ask that. Here are 2 pictures of the Line adjust Pot..

[Image: http://i292.photobucket.com/albums/mm38/...5evoss.jpg]
[Image: http://i292.photobucket.com/albums/mm38/...pdkpdm.jpg]

Clearly not a 250 ohm 25 Watt RHEOSTAT. It measured 5 K.. But a interesting story.. At first it measured 3 Ohms.. and from center to to end about 1K to 0 ohms.. Same way other direction... I took it apart and cleaned it and now measures 5 K.. the way it should..

Anyway I ordered a replacement. a 250 ohm 25 Watt RHEOSTAT.

So waiting on the pot...

But more to follow...

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vecher
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#4

09-20-2016, 05:46 PM
Here is a list of all resistors and their values..

Measured
R1 40K 41.7K Replaced
R2 2 Meg 2.05 Meg
R3 27K 27K
R4 15K 17.5 k Replaced
R5 20K pot 20K
R6 10K pot 10K
R7 330 Ohms 3 Watt 330 Ohms
R8 47K 50.2K Replaced
R9 350 ohms Pot 3 Ohms then after cleaning 5K Replacing

The Replaced resistors were chosen to get exactly the Right ohmage..

The 2 Caps were originally replaced Did not change them..

There was a resistor across the R9 pot from center contact to side that goes to the 4 Position switch measuring 464 Ohms.. It was removed as it didn't do anything..

[Image: http://i292.photobucket.com/albums/mm38/...dquezd.jpg]

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vecher
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#5
Big Grin 

09-22-2016, 04:53 PM
Ok, Just received the new Line adjust Rheostat. It cost me almost as much as I paid for the tube tester...

[Image: http://i292.photobucket.com/albums/mm38/...v1ekhi.jpg]

Before I install I want to check the BY1 rectifier. In schematic it say its Drawn backwards. So how would I test it.. I assume its like any other Diode? but really not sure.. I want to make sure its not shorted so I do not burn out the new Rheostat.. Can it be replaced with a modern diode? If so how?

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vecher
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#6

09-22-2016, 08:45 PM
Ok, on schematic.. 8Y1. The side that goes to R5 is marked on part 8Y1 Electron +K RRCO

The other side goes to the Switch..

Measured with meter - side to +k Plus side to switch 5.56 Meg
Measured with meter + side to +K neg side to switch 23.5 Meg

This is with one side disconnected..


Does that look right?

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vecher
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#7

09-23-2016, 11:25 PM
Ok I decided to put in the new Rheostat. Works great. Now on to calibration.. There is a calibration pot R5 I believe but no instructions on how to set.. Anyone know how to do calibration on this tester??

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vecher
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#8

09-24-2016, 08:44 PM
Ok, Did my best at calibration. Now when I set the line adjust to the line adjust line it reads the filament voltage setting correctly. When I put in a tube and compensate for the current draw the voltage is right on after readjusting the control..

Tube tester now works correctly..

It will be a great addition to my equipment for testing the older 4 and 5 pin tubes..

It cost a little more than I wanted but at lease it good now..

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klondike98
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#9

09-25-2016, 07:54 PM
Glad to see it worked out for you Skip!  I thought it working ok when I had it... but that's what happens when you have a chemist playing with electrons and wires.  Icon_biggrin  I learned something from watching your fix!
Cheers,
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[Image: https://www.dropbox.com/s/5m63ib99yfx2eg....jpg?raw=1]
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vecher
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#10

09-25-2016, 10:28 PM
It did work when I got it. And I got it for a good price..

So I am not unhappy by any means. I need one that would check the older tubes.

Glad I got it.. I just improved it a little.

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morzh
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#11

09-26-2016, 08:20 AM
Well, it is all well that ends well.

Congrats on a good working tester.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
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