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  • #2320
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    what i have here is a rogers b-510
    this is all i know about it. would like to make it operational, but i can find NO info on it. any help would be appreciated. included is a picture of it

    Download 107_0654.JPG. (Caution: This file may not be virus scanned.)

    Forum Participant

    another question, the tubes are all metallic coated (?) rogers tubes. should i use these old ones, or replace with new? they all look fine.

    Ed Kraushar
    CVRS Member


    I have attached a schematic for your radio at–

    Unfortunately the schematic is poor due to the very poor quality of the original schematic in the Rogers manual.

    Check the chassis layout and parts list your bulb may be used as a fuse, one is indicated.

    The tubes are Rogers Spray Shielded types and I would keep them if the radio plays with them as they can be quite rare. The waxed paper tubular capacitors along with electrolytic capacitor should be replaced before using the radio.


    Eric Strasen
    Forum Participant

    Re: Spray-shield tubes. I’ve got a Rogers-Mjestic 7R621 for which I rounded up several Rogers and Marconi branded spray-shielded tubes with the help of some CVRS friends in Canada and a lot of patience. My most recent venture in the spray-shield world was with a 1933 Grigsby-Grunow Majestic (the first of many U.S. firms to use the "Majestic" brand name) Model 463 "Century Six." The G-G spray-shield tubes, which I suspect pre-date Rogers, are somewhat easier to find — but more often than not are non-functional. I wound up buying two or three of each type in order to find one that would work, and most of these tubes were N.O.S., N.I.B.! The G-G spray-shield tubes differ from Rogers in a couple aspects. All of G-G’s product, made in their own tube plant, are pre-octal. I don’t know of any U.S. manufacturer other than Majestic who made this type of vacuum tube, and Grigsby-Grunow was out of business before RCA introduced the octal tube. The spray coating on G-G’s tubes appears the same as Rogers, but does not cover the tube base like Rogers’ product. A ground connection from the G-G shield is made through one of the tube pins. G-G numbered their spray-shield tubes the same as non shielded tubes, but added a suffix "S". Thus, a 2A7 became a 2A7S, a 55 became a 55S, etc. Rogers created a whole different and sometimes confusing naming system for their spray-shield tubes.
    So, if you don’t want to spend a lot of time and expense like I did on my two spray-shield radios, buy a non-shielded substitute tube, wrap a goat shield around it and ground the shield to the chassis. The substitute will probably function better than a spray-shield original anyway. There are substitutes for most (but not all) Rogers spray-shield tubes and you can find tube substitution lists on a couple of Canadian sites.

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