Hello all.....I have a 21H leslie connected to a Hammond C3....The motors in the leslie wont turn...are the motors controlled by tubes in the amp?
I tested the motors by connecting them to an extension cord and they DO work...
Yes.
There is a DC voltage superimposed on the AC music signal on pin 6.
It is blocked from the amplification circuit by the .1 cap but is received by the 6J5 Tremolo Tube.
The 6J5 warms up - the tremolo relay closes and the rotors spin up.
The Brake Socket may also be involved...
1969 Hammond A-105, Leslie 22H, 1961 M3
XK3-C, VK8-M, Boss RT-20, Neo Ventilator
Roland XP-30 (3), XV-5080 (2), Various Fatar/Studiologic Weighted Contollers (SL-1100, 1176, 880)
Fast is the "default" for 21H Leslies with no power applied to the relay. The motors should fire up briefly when you first turn the power on even if the console switch is on Stop. If this doesn't happen, there is probably a problem with the relay such as burned or contaminated contacts or broken wiring to or from the relay.
Some original relays have been replaced with crappy ones on a printed circuit board over the past few years. These fail.
You can also try removing the 6J5 tube, which should switch the motors on. It won't hurt anything to run the amp without it.
Great news!!!! The motors are running on fast... But the console switch doesn't control them.....It has a newer relay in it.....Is there a way to test these, or should i just order a new one? THANKS thus far!! You guys are great!!
Great news!!!! The motors are running on fast... But the console switch doesn't control them.....It has a newer relay in it.....Is there a way to test these, or should i just order a new one? THANKS thus far!! You guys are great!!
Well, what did you do to get the motors to start running on fast?
The problem could be either in the organ's Leslie kit or in the Leslie amp. There's no way to tell from the information you've provided.
There was a broken wire that went to the brake socket.....i reattached it and im in business.....but they stay on fast and i cant control them with the console switch
is there a way to test those possible problems or should i just buy a new tube and relay and use the process of elimination?? Thanks to all for the help!!!
I'll defer to the experts here, but I had this problem recently with a 21H. There was a loose connection at the rectifier tube that lowered the power supply voltage enough so that the Leslie kit didn't send enough voltage to switch speeds. This was with a CV, but I assume your Leslie kit is similar. This is the kit I have.
So I would say a possible first step would be to check the voltages in the Leslie against the schematic, assuming you're familiar with the necessary safety procedures. This site is for the 122, but most of the concepts apply to the 21H. It might help you to drill down exactly what the problem is.
(I have a 2-speed motor controller installed to get fast and slow instead of fast and stop, but that didn't have anything to do with my problem)
Home: 1935 Hammond Model A w/2 A-20 tone cabinets & Leslie 147, Rodgers Jamestown 100
Church: Hammond CV, 2-speed Leslie 21H
Hello all....as i was checking connections in my 21H amp, i noticed the wires were lose and burnt in the small transformer...i've included some pics...what type transformer is this?? does it supply the DC voltage for the leslie?? Are there transformers from other amps that are interchangeable?? i have a leslie 125 amp that i use for parts....can i use the power supply from the 125? Thanks in advance!!
Attached Files
Last edited by Guest; 01-13-2014, 04:51 PM.
Reason: wrong info
The component you removed is a power supply choke. It should measure ~60 Ohms--if this is a 21H amp. It looks like someone put 6L6s in it, but it's supposed to have 6V6s. 6L6s draw twice the heater current. Also, does it have one or two GZ34 rectifiers in it like someone wrote on the side? Does the cabinet still have the field-coil woofer?
Replacement chokes are available from Classic Tone. The 125 amp doesn't use a choke.
If I read the photo correctly, there may still be an original wax dipped paper capacitor on the motor sockets. This is a likely cause of motors always running on fast due to a shorted capacitor.
Lastly, I know I'll get downvoted for this, but, based on your questions, I am concerned that you are getting into an amp repair that's over your head, especially since it appears to me that someone may have done some experimental mods on this amp in the past.
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