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 Post subject: Re: Heathkit TT-1 Tube Tester
PostPosted: Feb Tue 06, 2018 3:39 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1571
Location: St. Paul, Minnesota
Chris died young, over ten years ago now.


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 Post subject: Re: Heathkit TT-1 Tube Tester
PostPosted: Mar Sat 10, 2018 3:12 am 
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Joined: Mar Sat 10, 2018 3:07 am
Posts: 1
I too have just acquired a TT-1 and am in need of some guidance. The previous owner said the bridge rectifier for the 300, 400 and 600ma filaments has failed. I have read a few articles saying this is fixable and a few saying it isn’t. Most of those articles are over 10 years old. Would love to be pointed in the direction of someone who can help. Thanks in advance!


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 Post subject: Re: Heathkit TT-1 Tube Tester
PostPosted: Mar Sat 10, 2018 1:45 pm 
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Joined: Nov Wed 30, 2016 7:35 pm
Posts: 1678
Location: Sunbury, Ohio 43074
Unless someone is familiar with the innards of this particular tube tester, we'll need to see a schematic to advise on replacement of any of the parts. IN GENERAL ... you can replace any older selenium rectifier with a modern silicon such as a 1N4007, however, there could be an adverse effect since the newer parts have slightly different characteristics than the older selenium. Here is an excellent paper on the differences and "how to do it". http://w3hwj.com/index_files/RBSelenium2.pdf

In general, for replacement of selenium with silicon in a power supply, this should be fairly straightforward, possibly just adding a resistor. In other uses, perhaps not so much.

The idea would be to make your replacement parts transparent to the instrument, so that it mimics the original part as much as possible. In the case of a rectifier upgrade from selenium to silicon, bridge or otherwise, you'll find a slight increase in DC voltage. This can be a problem for either calibration, or for other components voltage tolerance, and should be brought back into original specs as much as possible.

Hope this helps.

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Preserving the history of electronics, one boat anchor at a time! :)


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 Post subject: Re: Heathkit TT-1 Tube Tester
PostPosted: Mar Sun 11, 2018 6:57 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 580
Location: Stafford, Texas USA
There no bridge rectifier in the TT1.

There is a 3-section AC capacitor for the 300, 450 and 600 ma filaments.

I have never found a bad one.

Previous owner may be talking about the bridge rectifier that inside of the meter has failed.

This is very hard to fix.
Over all a TT1 is a very hard to fix.

Jimmie Stewart


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 Post subject: Re: Heathkit TT-1 Tube Tester
PostPosted: Mar Sat 17, 2018 8:08 pm 
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Joined: Nov Wed 30, 2016 7:35 pm
Posts: 1678
Location: Sunbury, Ohio 43074
Well, against all odds, and I do mean ALL .. I just scored a TT-1A in excellent cosmetic condition. It includes the assembly manuals and supplimental data booklet. Now for the million$ question .. does anyone have a schematic of this critter or do I have to draw one out? I'd have thought it would be in the manuals that came with it, but no joy on that.

Thanks in advance....
Barry

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Preserving the history of electronics, one boat anchor at a time! :)


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 Post subject: Re: Heathkit TT-1 Tube Tester
PostPosted: Mar Sat 17, 2018 8:26 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 11702
Location: North of Mpls, Minnesota
PM me with your email and I will send the info you need for your new tester.

Dave


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 Post subject: Re: Heathkit TT-1 Tube Tester
PostPosted: Mar Sun 18, 2018 1:41 am 
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Joined: Feb Sat 11, 2012 12:44 am
Posts: 237
Location: Islip, Long Island, NY
Heathkit TT1 data:

http://ebaman.com/index.php/remository/ ... ly-Manual/

http://ebaman.com/index.php/remository/ ... -Assembly/

http://ebaman.com/index.php/remository/ ... er-Manual/

The Heathkit TT1A is my goto tester. I've tried them all.

Jerry
W2JI


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