Hammond B200 Leslie 11 Pin Socket Question

[joecool240]

Hello all. Concerning a Hammond B200 organ, is this a single channel organ (rotary only), or a rotary/stationary (non rotary) channel organ?

Trying to help someone find/adapt an 11 pin Leslie for his B200. I know the rotary signal is on PIN 1 of the B200 11 pin Leslie socket, but does the B200 organ use or send anything to PIN 2 (stationary/non rotary) of it's 11 pin Leslie socket? I can't seen to find a schematic/service info on the web.

Thanks for any info.
Joe

[kkeys]

The suggested Leslie for the B-200 is the HL-822 which is a two channel cabinet (rotary and stationary). I'd think that the "Piano" voice and the pedals would sent to the stationary channel.

In addition these 11-pin Leslies from a similar timeframe era are two channel. 415, 615(3 channel) , 715 , 720, HL 722, and 815.

[rdunniii]

Does anyone know the maximum and minimum voltages on pins 7 and 8 to make the fast slow function work? I have a B-200 connected to a 3300 and the 4.63 volts doesn't cut it. I think it is 14 volts but figured I'd see if anyone knows better.

[Jyvoipabo]

Hello,

With '3300, control pins have logic level with 2 states possible.
On = Closed contact to Gnd = Zero volt.
Off = Open contact = 5V by internal pull-up resistor.
This voltage of 5Volt is supplied by the µ controller whose corresponding port is programmed as input with integrated pull up resistor.
Do not send any voltage on this pin. You could destroy the µ.
If you can't find 5V in the Off condition then there is a problem.

Other Leslie use the same principle but voltage are differents (~14V with '740)

JP

[rdunniii]

Well, I finally figured this out. The original circuit was a darlington relay control circuit. Made sense as there were real relays in the 822 Leslie. But the current batch of Leslies don't use relays. They use ICs. The difference in current draw is 10-100s to one. I could barely measure 1 milliamp for the 3300. But that is insufficient current to saturate the high power transistor of the original circuit. So it does not work. I removed the power transistor from the circuit and used a jumper to connect the emitter to ground of the first stage transistor. And now it works perfectly. The existing transistors are not even warm (they are rated at 0.25 watt whereas the power transistor switch was rated at 10 watts). Of course if someone connects it to an older Leslie with relays it will blow those transistors in a flash.