Quote:
Originally Posted by Winky Dink
This an item I picked up last August. It cleaned up nicely, and I'm hoping it could be useful for a quick CRT check when buying a TV in unknown condition. . . . . . I have no documentation for the unit, so I cracked it open to see what I could figure out. There were only three "usual suspects"--two resistors and a paper cap--so I replaced them with on-hand components.
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Well, the first thing you should do is to get a manual, and in the past they have been relatively easy to find, provided you look for the Eico 630 CRT tester! The two units are electrically identical. In fact the biggest difference, other than control layout, is the Philco uses a .0047 MF 400V cap while the Eico uses a .005 MF 400v cap.
The other parts are a 33K ohm 1W 10% and a 10K ohm 1/2W 10% resistors and a NE-45 Lamp. The calibration pot is a 2 Meg ohm.
This original manual just ended today, unsold.
http://www.ebay.com/itm/281459528911
To give you an idea what the Eico 630 looked like, this is a picture of the earlier model. The later models were silver.
http://www.ebay.com/itm/380971165517
This checker will check most any CRT between a Pilot 3KP4 and a Du Mont 30BP4, but it won't safely check small neck tubes or almost any tubes later that the mid-1950's and any tube that does not have a 6.3 filament.
Mine is my checker of choice for 7JP4s. I'm impressed how clean yours is! When I first bought mine, it had been stored in a damp basement and the bottom had completely rusted through.
The octal socket on top is for an adapter, which must be wired by the owner, with clip leads, to check special based CRTs in a list in the instruction book.
There is one epay vender selling a CD of Eico circuits for $20, but it seems overpriced to me.
My paper manual came from an epay seller. If memory is correct, it came from glendalemanuals.
Search for one of their epay Eico manual listings and ask them. Two years ago, mine was $7.99 with shipping.
(No affiliation, other than a satisfied customer.)
James