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 Post subject: Precision Model 612 Tester
PostPosted: Sep Wed 22, 2021 3:31 am 
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Joined: Sep Sun 11, 2016 1:09 am
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Location: Vancouver, WA 98665
Trying to help a friend with the above tube tester he acquired and not sure if this has an on/off switch or not. When plugged in, nothing lights up or moves. What are we missing?


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 Post subject: Re: Precision Model 612 Tester
PostPosted: Sep Wed 22, 2021 3:37 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Oak Creek, WI USA
Press the white button that says "Read Meter" in (it takes a pretty solid press) and see if the power light goes on and the needle on the meter swings up toward the middle.


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 Post subject: Re: Precision Model 612 Tester
PostPosted: Sep Wed 22, 2021 4:47 am 
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You can see the manual here - https://vintagetubeelectronics.com/wp-c ... Manual.pdf


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 Post subject: Re: Precision Model 612 Tester
PostPosted: Sep Wed 22, 2021 4:20 pm 
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Joined: Sep Sun 11, 2016 1:09 am
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Location: Vancouver, WA 98665
Thanks guys, think even I can figure that out.


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 Post subject: Re: Precision Model 612 Tester
PostPosted: Sep Thu 23, 2021 3:44 am 
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Joined: Sep Sun 11, 2016 1:09 am
Posts: 39
Location: Vancouver, WA 98665
Has no power. Anyone have any idea on the fix?


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 Post subject: Re: Precision Model 612 Tester
PostPosted: Sep Thu 23, 2021 4:08 am 
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Joined: Mar Sun 20, 2016 11:04 pm
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Location: Mesa, AZ 85206
It would be helpful if you could elaborate a bit...

Do you mean that when you press in the read meter button the meter does not move? does the indictor light go on?

Did the fuse blow?

Steve


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 Post subject: Re: Precision Model 612 Tester
PostPosted: Sep Thu 23, 2021 12:32 pm 
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Location: Sunbury, Ohio 43074
a big +1 to that. Remember when you ask for this type of help online, we cannot see what you are doing. YOU are our EYES.

The more detail you can give, the more likely it is that we can help :)

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Preserving the hist. of electronics, one boat anchor at a time! :)
https://www.bbtvtestequipment.com


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 Post subject: Re: Precision Model 612 Tester
PostPosted: Sep Thu 23, 2021 11:10 pm 
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Joined: Sep Sun 11, 2016 1:09 am
Posts: 39
Location: Vancouver, WA 98665
Fuse looks OK, no lights or meter movement. Should the white button stay depressed?


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 Post subject: Re: Precision Model 612 Tester
PostPosted: Sep Fri 24, 2021 12:32 am 
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Location: Oak Creek, WI USA
zboo wrote:
Fuse looks OK, no lights or meter movement. Should the white button stay depressed?


No, because you will have to press it when you read a tube. It has a spring.
There's a firm snap when you turn it on, if it's anything like mine.


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 Post subject: Re: Precision Model 612 Tester
PostPosted: Sep Fri 24, 2021 12:47 am 
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I do not see that we have asked this, but are you comfortable reading the schematic, taking voltage measurements, etc? Please be VERY careful when working with AC voltages.


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 Post subject: Re: Precision Model 612 Tester
PostPosted: Sep Fri 24, 2021 3:15 am 
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Location: Mesa, AZ 85206
+1 to the above!

Pressing the read meter releases the off button, and will not stay depressed.

A simple "test" : with the tester unplugged, put an ohmmeter across the two prongs of the cord. When the off button is released (up), you should get somewhere around 50-70Ω. This is a quick check of the off switch, the cord, the fuse, and the primary of the transformer...

Steve


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 Post subject: Re: Precision Model 612 Tester
PostPosted: Oct Fri 01, 2021 3:18 am 
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Joined: Sep Sun 11, 2016 1:09 am
Posts: 39
Location: Vancouver, WA 98665
Thanks all, especially Tom Carlos for the manual download. Looks like it is working, tested a few tubes and seems OK with another tester I have.


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