Rodgers electronic 32 foot resultant equipment or information sought

[Guest]

Dear Friends,
Our 45 rank Schlicker pipe organ has two electronic 32 foot resultants, a Bourdon, and a Bombarde. We believe that is is circa 1973, but it could be older. We appear to have all the components except the equipment, possibly a power source/ DC rectifier? into which a 7 pin circular male plug goes into. The plug is approx. 1 1/4 inch in diameter. The seven pins appear to be uniform in size (approx 1/8 inch wide), and form a perfect circle around the circumference of the plug, as if looking at a clock face with only seven numbers. This plug, and a 25 pin computer/telephone -type plug go into a wooden box with 5 or 6 motherboards and two amplifiers. The output from this wooden box is four speaker connections, two for the bourdon and two for the bombarde, going into a big woofer tone cabinet (M10?), and a smaller 8 and 4 tweeter tone cabinet (P?). We're pretty sure the 25 pin connector is for the 32 pedal contacts and the two stop tabs, all of which should easily connect to our new Peterson electronics. Of anyone has knowledge of this power source? or any scematics or serial numbers, we would be most grateful if you could share it with us. [email protected] or 201-835-5311.
Thank You.
Rev Will Moser

[jbird604]

Well, I don't recognize that at all, but I'm curious to know what it is. Maybe someone will recognize it and chime in. Could you perhaps attach some pictures?

[indianajo]

One usually determines what power source a transistor based device needs by opening it up and looking at the input wires to the power circuit. If the input wires go to a 250 VAC rated fuse and then an e frame transformer, it is probably a 120 VAC input in the western hemisphere. Coming out of the transformer should be 2 to 4 rectifiers (small cylinders with a line on one end), or a bridge (square plastic block) that has two wiggly lines for the two AC inputs and + and - for the DC outputs. If there is no AC transformer, and no rectifier(s) with a line on one end, look for electrolytic capacitors. These will be plastic wrapped aluminum cans with a plus pointing at one lead, or a minus in balls pointing at the other. The plus of a DC supply goes to the plus of the can. The voltage of the DC supply should be about 3/4 to 7/8 of the DC voltage rating on the first power supply cap, the one going to the fattest wires. If there are two caps, one determines if they are wired plus to minus in pairs. If so the voltage required on the input is twice the rating of one cap. You can confirm your guess as to which connector is the input by checking with the ohmmeter that it goes to the plus or minus of the main caps, perhaps with a 600 ohm (.6 v) drop for a silicon diode. On rectifiers, the plus current goes in the non-line end. One can find a bin of surplus DC power supplies often at the charity resale shop for $1-2 each.
For a better explanation of the silicon diode DC power supply, read some chapters of Thomas L. Floyd, Electronic Devices the Electron Flow Version or another surplus text from your local community college or electronic trade school. I paid $2 for mine at Goodwill. Much has happened since I took Electronics for Scientists in college, that mostly covered vacuum tube circuits.