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 Post subject: Help with Eico 666
PostPosted: Jun Wed 12, 2019 10:53 am 
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Joined: Feb Fri 03, 2017 5:28 am
Posts: 136
Location: Mikwaukee, WI 53207
I picked up a nice looking 666, but cant set the line voltage.
Depressing the test button results in only a small movement of the needle.
I do have -65 VDC at the rectifier.
Thanks for any help.

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Collecting audio gear and radios because I couldn't afford to buy it when I should have.


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 Post subject: Re: Help with Eico 666
PostPosted: Jun Wed 12, 2019 11:56 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 18545
Location: Albuquerque, NM 87123
You need to first replace the two electrolytics: C2 10uf 25 volt and C1 10uf 150 volt.
Check all the resistors, especially R19 270K, R5 129 ohm, R6 50 ohm, R2 680 ohm and R3 200k.

If this doesn't help then you may have some dirty controls/switches.


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 Post subject: Re: Help with Eico 666
PostPosted: Jun Wed 12, 2019 1:21 pm 
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Joined: Nov Wed 30, 2016 7:35 pm
Posts: 5027
Location: Sunbury, Ohio 43074
The manual for the 666 is available on BAMA here : http://bama.edebris.com/manuals/eico/666/

Read the section on how the LINE ADJ works ... it's on page 5. That may help you narrow it down. As mentioned, definitely replace the electrolytic capacitors before you do anything else. There aren't all that many components in this tester, so it would not hurt to check the resistors as well, and even the potentiometers. There are also a few diodes you can check, including one in the leakage circuit that may be affecting the line set.

It's likely that you've got some dirty switch contacts or potentiometers in a tester this age. Also possible that the meter is bad, but there are other ways to check that. DO NOT use your ohmmeter to check the meter movement. See other threads on this forum or my website below for how to do this safely.

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 Post subject: Re: Help with Eico 666
PostPosted: Jun Wed 12, 2019 5:17 pm 
Member

Joined: Feb Fri 03, 2017 5:28 am
Posts: 136
Location: Mikwaukee, WI 53207
It looks like someone has already replaced the C1 (10/150) with a 10/450.
I'll check R19 and R8 as these are the only resistor in the Line Test circuit.
I'll then check the meter. I have found and read the instructions on how to do this.
I don't want to waste my time changing out pars if the meter is shot.

http://www.oldtubes.net/library/test_equipment/reeland_eico_scans/EICO_666_TRACINGS_3.png

Thanks,
Joe Y

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Collecting audio gear and radios because I couldn't afford to buy it when I should have.


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 Post subject: Re: Help with Eico 666
PostPosted: Jun Wed 12, 2019 9:11 pm 
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Joined: Jun Sun 23, 2013 9:03 pm
Posts: 453
Location: Canandaigua, NY
I think the adjustment pots are also know to go bad. It's a simple tester and unless the transformer or meter is bad, usually an easy fix.


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 Post subject: Re: Help with Eico 666
PostPosted: Jun Thu 13, 2019 12:06 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 10942
Location: Latham NY
Yes, the cal pots can have the Tin Whisker problem and need to be taken apart and cleaned or replaced. Also since it was a kit you need to go over every solder connection for poor workmanship.


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 Post subject: Re: Help with Eico 666
PostPosted: Jun Fri 14, 2019 3:48 am 
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Joined: Feb Fri 03, 2017 5:28 am
Posts: 136
Location: Mikwaukee, WI 53207
Good news:
The meter checks out fine.
Next, I'll try to disassemble and clean the adjustment pots.

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Collecting audio gear and radios because I couldn't afford to buy it when I should have.


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