The Traynor Rotomaster-Yorkville Sound’s late-1960’s attempt at creating their own “Leslie” type rotating speaker. Once I delved into this, I noted that it was constructed with many “off-the-shelf” components, and it looked to be hastily designed. It was also only single speed: fast.
The horn driver is a pair of standard Fanon DU60, 60 watt, 16 ohm units, wired in parallel to be able to sink up to 120 watts at 8 ohms. The sound tube from the drivers to the horn is constructed of standard iron gas piping and fittings, and the motor is a common motor used for ventilating fans typically.
One of the drivers was inoperative, but I was able to repair it internally, finding a “blown” fine wire connecting to the voice coil. These drivers are still available, so worst scenario would have been to purchase a complete replacement.
The motor and rotating mechanism were quite noisy, the motor vibrating and the rotating horn section rattling.
The motor bearings were okay, but needed lubrication. As well, I replaced all of the shock mounts with better, softer rubber to reduce noise transfer.
The rotating horn drive wheel had a very loose sleeve bearing. The only way to secure it properly was with a good quality epoxy.

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