The Organ Forum

My Allen Gyro speaker cabinet has marked in several places "For Flute Only", and "Not For Diapason". My tone generators (?) are marked "Flute" and "Diapason", but I'm not sure how to determine which output comes from each generator set. Is there a fairly easy way to tell?

 Thanks!

Just hook one of the connectors to the amp in the gyro and see which stops will play. Nothing bad will happen if you connect the diapason generator output to a gyro marked "for flute only." 

The only reason a gyro would be marked that way is that it has a particular rotational speed or arrangement of drivers on the baffle that the engineers judged to be appropriate for flute tone dispersion.  The corresponding speaker intended for diapasons would have either a slower rotation or a different set of drivers.

If you have only one speaker cabinet, your amplifier probably has two inputs and two level controls, so you have to feed both generators into the same gyro anyway.

If your amp doesn't have the two inputs, perhaps there is a mixer built into one of the generators that allows the other one's output to be piggy-backed.  If that is not the case, then you are missing one of the gyros that came with the organ!

John

Thanks, John!! My amp in the Gyro DOES have two inputs, so I will hook both lines to it. I do only have one Gyro; as a matter of fact, I only have the one speaker and would like to get another. I have controls for the Gyro on both sides of the console, but will only be able to plug one control into the amp till I get another speaker.

 I still do not know how to make the amp function - the elusive wire running from the box with the transformer on the side of the speaker, with output running up to the split rings. Any guideance will be appreciated. Earlier, I spoke with Norm on the phone, and he told me how to check that my console was in fact producing a tone signal; while doing that I discovered that one of the leads has a loose connection, so I will have to re-solder that before I proceed. It does sound good thru my guitar amps from my keyboard.

 Thanks again!

If that Allen gyro isn't missing any parts, you should have a pair of wires leading from the output terminals on the amp (which will be marked perhaps "16" and "C" -- anyway, there are two screw terminals side by side in a black terminal block).  This pair of wires should be connected to that metal box (which is in fact a crossover assembly) and should be wired to the terminals marked "AMP" -- the wire from the C terminal of the amp to the Common terminal of the crossover, and the wire from the "16" or red-dotted terminal to the AMP terminal.

Then, coming from the crossover box, you should have a pair of wires going up to the commutators of the gyro (the rings/brushes). This pair should be connected to a Common terminal and the "High" output screw.  This is because the crossover splits the amplifier output into High and Low bands and sends only the High band into the rotating elements.

The LO output of the crossover should be connected to the bass cabinet, which probably contains a pair of 15" speakers.

If you have all the parts, you should be able to hook this up as described. If it's not all there, let me know.

John

John,

Thanks. I am missing the bass cabinet. All I have is the Gyro, with 2 rotating speakers. I believe the wire that is hooked to the crossover on one end and nothing on the other end used to go to another speaker - probably the "phantom" base cabinet. I'm searching for one now, as well as another Gyro for the other channel. I knew it only had the one speaker when I bought it (I'm also missing the bench) but it was a bargain @ $75, so I took it as is. In fact, I am very fortunate that I did not blow the speakers when I installed a plug on the speaker wire and plugged into line voltage!! I will look for a place to plug the amp into the relay box when I get home today.

Thanks.