Leslie 47 to 147 conversion still a couple questions before power up

[MaceHathaway]

I bought a 47 Leslie amp a couple years ago and just been getting around to working on stuff.

When I bought it I was told the conversion was done, got it and it was a mess, wrong relay etc, I just couldn't use it that way...didn't even want to risk tubes.....so

New can filter( had the completely wrong filter) and a dozen or so caps and resistors....
Potter and Brummfield relay.... And we are close

Here are my two main questions and I'll include photos...

The Brake circuit....the relay is now wired proper for two speed and orange wire from the brake removed....but the 47 and 147 are just slightly different here....8 wires on the main tranny on the 47...and 6 on the 147...the two extra wires on the 47 are red with blue stripe....they go out of the tranny and into the brake circuit.... where do they go now?....also my blue main line also seems to go through the brake circuit here where in the 147 it goes directly to mains power at the front of the amp...in the brake circuit is soldered in on just one end to a 1 mfd 400 vdc cap, and then goes on to the tranny...there is also a small coil and a 100 ohm resistor....do they just get removed....none of these components are in the 147....so I'm guessing they get clipped, but don't want to go there just yet....
can all that stuff just stay in place where it is....sure hope so

Second question...the two yellow wires from the tranny, one to the rectifier and the second one I'm not sure?....on my 147,the yellow wire is tied in with one red wire that comes from the can...on the 47...it comes out of the tranny and goes straight to can...( is there any difference if the wire is soldered at the other end???)...so its tied in with red wire there, instead of on the board I can't Identify....on the 47, they look like little spaceships....photo one is the 47, brake wire removed.


I still have one last question....
will I be able to run my 147 off the Daisy chain on the 47???
Thanks for any help I can get in advance!!

[muckelroy]

The Brake circuit....the relay is now wired proper for two speed and orange wire from the brake removed....but the 47 and 147 are just slightly different here....8 wires on the main tranny on the 47...and 6 on the 147...the two extra wires on the 47 are red with blue stripe....they go out of the tranny and into the brake circuit.... where do they go now?....also my blue main line also seems to go through the brake circuit here where in the 147 it goes directly to mains power at the front of the amp...in the brake circuit is soldered in on just one end to a 1 mfd 400 vdc cap, and then goes on to the tranny...there is also a small coil and a 100 ohm resistor....do they just get removed....none of these components are in the 147....so I'm guessing they get clipped, but don't want to go there just yet....
can all that stuff just stay in place where it is....sure hope so

You can leave it. It's the brake circuit. If you remove it, you have to cap off and insulate the extra wires, so just leave it, and be sure the orange wire (which used to connect the brake to the relay) is out of the way and capped off. The remaining questions about the brake are just you asking me how the brake circuit works, and in this scenario, it's all laid out in the Leslie 47 series service manual, but it is also no longer relevant to you since you are not using the brake circuit anymore.

Second question...the two yellow wires from the tranny, one to the rectifier and the second one I'm not sure?....on my 147,the yellow wire is tied in with one red wire that comes from the can...on the 47...it comes out of the tranny and goes straight to can...( is there any difference if the wire is soldered at the other end???)...so its tied in with red wire there, instead of on the board I can't Identify....on the 47, they look like little spaceships....photo one is the 47, brake wire removed.

You are using the term "tranny" very loosely here. These amps have a power transformer, an output transformer, and a choke. The choke is the one that has two yellow wires coming out of it, so I assume this is what you are referring to. The choke is used to filter the AC ripple from the rectifier. In both the 47 and 147 circuits, the order of connections is:
-- Power transformer B+ winding
-- Rectifier
-- Choke and 30uF cap (together)

I can't tell if anything is amiss in looking at your photos. That looks like a typical 47 rectifier board to me.

The way you wrote this post make it sound like you may not know how to read the schematic of a tube amplifier. Please forgive me if that sounds harsh, but your concerns over the location of wires etc just reads that way. What matters are connections. There will be some variations in how those connections are made, but you must follow the components that are in front of you, and follow the schematic to make sure things are connected how they are supposed to be connected.

Your Leslie 47 rectifier appears to original, and has 8 diodes, not 4. (The "Little spaceships" are early silicon diodes.) It would be better to replace them with a set of 4 1N4007 diodes, for reliability sake, to mimic what the 147 rectifier does. That is to say, for every 2 of the yellow diodes, replace with a single 1N4007 diode. There is really no reason not to at this point given how inexpensive 1N4007 diodes are.

I still have one last question....
will I be able to run my 147 off the Daisy chain on the 47???
Thanks for any help I can get in advance!!

Let me make sure I understand. You are keeping the extra speaker socket on your Leslie 47 and want to know whether or not you can connect another Leslie to it? As long as it is a 6W type Leslie (45, 47, 145, 147, etc) then yes. The main thing to consider is the position of the load switch. If you are connecting to the speaker output of an organ, only one of the Leslie speakers in the "chain" should have the load switch set to 8 ohms. The 2nd one's load switch should be open. Another consideration is the power draw. Two Leslies will draw a fair amount of current so a power relay is a good idea (like this https://ssl.tonewheelgeneral.com/bui..._no=PWR-RELAY6 ). This is done to take the load off the organ run switch, which will quickly burn up if it's passing more than a few amps through it.

Please read the Leslie 47 and 147 service manuals. If any of it does not make sense, we will help as we are able to, but I would recommend letting someone qualified to look this over if you are in doubt.

[muckelroy]

One more thing, you didn't mention much about your relay The main difference between the wiring of a 47 and 147 relay is that the reed of the relay switches AC Hot, rather than brake voltage. So, your new relay's reed should be attached to AC Hot (pin 4 of the 6 pin connector,) and the outputs of the relay should run to each of the respective AC Hot terminals of the motor sockets. The relay's only job is to send AC Hot to only one, or the other, motor socket at a time.

The other side of the motor sockets should always be hard-wired to AC Neutral (Pin 3 of the 6-pin connector). You're just doing what is on the 147 schematic, except you don't have the 5-pin jumper connector that is involved in a 147 amp.

The 47 is just about identical the 147 amp, the biggest difference being the motor switching. (47 relay switches between brake and AC Hot, whereas the 147 switches the AC Hot between either the fast or slow sockets). Also, I assume you have already accounted for the obvious fact that you need:
-- 2 speed motor stacks on your Leslie
-- AC plug splitter to send power to both upper and lower fast/slow motors, since the 47 chassis only has one plug for each speed.