Path: /eico/b/. This is the BAMA archive. These manuals are available for download and free of charge. I am now accepting new manuals for inclusion in this. DESCRIPTION. Your new EICO Model Resistance-Capacitance-. Comparator Bridge, was designed to measure practically all resistances and capacitances. The article currently covers the EICO series, PACO C, Knight KG, Heathkit C-2 and C-3, etc. (More models will be added on an ongoing basis as I.

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Recently I have begun what might be the start of a nostalgic journey in vacuum tubes. Can 950bb explain how the power factor test on this model works? Fill in your details below or click an icon to log in: Since I have a digital capacitance meter, this is really not a big deal; but, I still like my equipment to be right.

As you mentioned the leakage tets function is a really valuable function that is not found in many capacitor testers today. Jun Tue 18, 4: For me the hardest part is getting high voltage wax capacitor replacements like elco. Ensure you are skilled enough to do this. Unless your photo is wrong, the model had a plastic pointer that reached all the way to the outer scale.

Eico: eico model b bridge construction : Free Download, Borrow, and Streaming : Internet Archive

Most relevant reviews See all 6 reviews. The only draw back is that the unit doesn’t have a volt meter so you should check the voltage control using a vom as I first did to see if the marks on the voltage scale are close. I’m having the problems you described on the highest ranges; so, I think I need to track down new capacitors.


The basic circuit of this unit is very simple. As the pointer dial approaches balance point, first the overlapping disappears and eventually the entire target area of the eye tube is completely open dark. A super bright eye tube means that the DC voltages are out of balance. More items related to this product. Agree with the others that you should not mess with the bridge caps unless dico are actually bad, as this can lead to calibration nightmares.

Vintage EICO Resistance Capacitance Comparator Bridge Model B | eBay

I contacted the seller and he was a TV repairman from Massachusetts. Users browsing this forum: I’ve found some capacitors with tighter tolerance figures; but, they are all non-stocked items that could take a few months to obtain. After verifying the schematics, the first test was the tube test, with just the heater power. Just out of curiosity, I’d like to know when Eico finally discontinued this model.

The power factor tester too is also quite handy.

EICO 950B – Repair/Restoration

These models use a balanced bridge that measures capacitance from 10mmf up to mf and resistance from 0. If I can find it, I’ll eventually swap them around. Any other suggested places to look? You are commenting using your WordPress. If the eye tube gives a full degree shadow with clean, sharp edges with the pointer within a few percent of the correct values, the bridge capacitors are okay and nothing will be gained by changing them. Jun Sat 22, 7: Often Eico custom made the face plates with the name of the school.


The power cord was changed to 3rd pin and grounded earth to chassis. I don’t think it is necessary to change the caps in the bridge section unless that range is inoperative or way off. Mine developed an internal short in the value potentiometer and took out fico winding of the transformer.

The unit worked when I got it and the changes I made were for safety reasons. PF eio added to these testers years ago before high efficiency electrolytics came around. Do not run down the voltage fast after leak test on a high value cap. Overall a great piece of hardware! I bought one several years ago from and old radio shop.

Jun Wed 19, 2: Jun Sun eco, 9: Heathkit C-3 light color scheme. To find out more, including how to control cookies, see here: This article discusses repair and calibration information for a number of 590b capacitor testers that all use the same fundamental test circuit.

When the bridge is far from balanced, the target area of the magic eye tube glows completely closed green, and in fact overlaps. So I started 950bb it. Otherwise, it’s in great cosmetic shape. For Leak testing pot P3 controls the output voltage. You just need to keep the ration capacitance ratio the same. It’s important to remember, when putting a capacitor through the paces, to return the voltage pot back to zero slowly, to avoid large currents passing through the pot.