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 Post subject: Model TV-11 tube tester smells hot
PostPosted: Jan Wed 11, 2017 9:04 am 
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Joined: Dec Sun 25, 2016 7:03 am
Posts: 67
Location: Karnak, Il 62956
I have used this tester lots of times with no problems. Last night I checking a tube and when I pressed the button to test the tube my needle went crazy. When I turn it on to test the needle goes all the way to the right and stays. When I turn the test button off and just leave power on the needle stays between the left and middle and won't adjust with the knob. I took the cover off to look inside and was a wire disconnected from the transformer, but can't tell where it goes. Wires are color coded but schematic does not give colors. Also when turned on the needle knob adjustment control switch seems to be getting hot and smells like it is burning. Don't know where to attach the wire, it's possible I could have pulled it loose when removing the cover. Any help would be appreciated.


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 Post subject: Re: Model TV-11 tube tester smells hot
PostPosted: Jan Wed 11, 2017 10:19 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 29444
Location: Maryland 20709, USA
Did you do a SHORTS test on the tube before the quality test?
That's always the mandatory first step, to prevent a shorted tube possibly damaging the tester.

The most common problem with vintage equipment is bad electrolytic caps in the power supply.
These are prime candidates for replacement in any restoration.

You'll have to consult the schematic to identify the loose wire.

I only use wire colors to assist in signal tracing within a specific instrument.
Even if the schematic shows colors, I don't believe them since they can change.
The exception is the leads from the power transformer, which should be consistent.

- Leigh

_________________
73 de Leigh W3NLB
http://www.AtwaterKent.info
Click "Grebe Stuff" for Synchrophase info


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 Post subject: Re: Model TV-11 tube tester smells hot
PostPosted: Jan Wed 11, 2017 1:56 pm 
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Joined: Dec Sun 25, 2016 7:03 am
Posts: 67
Location: Karnak, Il 62956
I'm afraid I check for shorts last. The wire that is disconnected is coming from the transformer, and by looking at the schematic I have no idea where it connects to.


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 Post subject: Re: Model TV-11 tube tester smells hot
PostPosted: Jan Thu 12, 2017 1:53 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 9923
Location: Latham NY
There are no power supply electrolytic caps in this tester, it's a simple emission tester. Can you post some pics of your tester? Someone here may have one and can identify the wire location.


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 Post subject: Re: Model TV-11 tube tester smells hot
PostPosted: Jan Thu 12, 2017 6:14 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 10162
Location: Mpls, Minnesota
Where does the other end of the wire attach to, you should be able to trace it on the schematic. What color is the wire.

Dave


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 Post subject: Re: Model TV-11 tube tester smells hot
PostPosted: Jan Thu 12, 2017 7:51 am 
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Joined: Dec Sun 25, 2016 7:03 am
Posts: 67
Location: Karnak, Il 62956
That's the problem, don't know where it goes. Wires on schematic aren't colored or numbered, not very detailed. Will try to get picture put on here. Thanks...


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 Post subject: Re: Model TV-11 tube tester smells hot
PostPosted: Jan Thu 12, 2017 8:23 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 10162
Location: Mpls, Minnesota
Where does the end that is still connected go? what color is that wire?

Dave


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 Post subject: Re: Model TV-11 tube tester smells hot
PostPosted: Jan Fri 13, 2017 7:37 am 
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Joined: Dec Sun 25, 2016 7:03 am
Posts: 67
Location: Karnak, Il 62956
It is coming from the transformer and is stripped. Will have to get someone to tell me the color, I am colorblind. I am going to try to post picture of it if I can figure out how. Thanks.


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 Post subject: Re: Model TV-11 tube tester smells hot
PostPosted: Jan Sun 15, 2017 10:53 pm 
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Joined: Nov Mon 02, 2009 7:01 am
Posts: 1775
Location: Lincoln City, OR
Greetings to Sinatra1982 and the Forum:

Please note: Leigh is absolutely correct: a test for shorts is a MUST BEFORE any other tests. A shorted tube can seriously damage the tube tester if emission or mutual conductance tests (quality) are performed. If a tube shows shorted on any position, remove it from the tester and discard the tube immediately.... such tubes are a hazard not only to the tube tester but to any equipment they may be installed in as well.

Regards,

_________________
Jim T.
KB6GM


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 Post subject: Re: Model TV-11 tube tester smells hot
PostPosted: Jan Tue 17, 2017 9:16 am 
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Joined: Dec Sun 25, 2016 7:03 am
Posts: 67
Location: Karnak, Il 62956
The wire is yellow with green striping and is coming from the transformer. I am pretty sure it goes to the filament tuning switch, it has a lot of wires going to it from the transformer and I can't tell which connector it should be attached to. I tried one place and turned it on and the needle adjuster still wouldn't work. I could smell something getting hot and it smelled like it was coming from the adjustment needle switch getting hot and I turned it off right away. I can figure how to do it I will try and enclose copy of schematic and maybe picture if inside tester if it will help. Thanks for helping me everyone.


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