lanxe

DIY: Leslie Combo Preamp
« on: June 27, 2007, 10:33:18 AM »
I did a search on schematics and didnt come up with anything

Rather than spend the $350 for one, it doesnt seem to crazy to make one. maybe?

BTW its a Leslie 147 that i want to jam some guitar into. I have heard of people putting a 1/4" jack in there and just using their guitar amp to drive the horn/speaker but i am not intrested in that. i want to use the leslie amp.

Thanks,
Ryan
Ryan


pucho812

DIY: Leslie Combo Preamp
« Reply #1 on: June 27, 2007, 10:43:09 AM »
I have a schematic of what you seek... As well as alternate(modern) trasistor replacements. We have one at work that is currently sick... When you run it with anything 1/4 it trips the internal circuit braker and shuts off... currently looking into the cause... I can get that schematic to you as well as circuit board graphics
You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is.

lanxe

DIY: Leslie Combo Preamp
« Reply #2 on: June 27, 2007, 12:28:34 PM »
that would be very cool, pucho!  :thumb:

thanks,
Ryan
Ryan

tommypiper

DIY: Leslie Combo Preamp
« Reply #3 on: June 27, 2007, 03:57:07 PM »
Yes, I'd be interested in seeing it too.  Thanks.
Imagine a wet, slightly chilled from its gas release and decompression, with water droplets condensing, sucking surface tension, slowly sliding down the side, capped by a healthy virgin froth on top..

DIY: Leslie Combo Preamp
« Reply #4 on: June 27, 2007, 04:35:22 PM »
FWIW, it's available here.
"Kind of like going into Safeway at 4 in the morning and chugging a beer in the produce section; been there, done that." - CJ

"We're not making an atomic bomb, just cooking a few electrons." - PRR

Michael Tibes

DIY: Leslie Combo Preamp
« Reply #5 on: June 27, 2007, 05:38:16 PM »
As far as I know the leslie input is kinda symmetrical ('electronically balanced' with a tube). I used to use a normal xlr as line input for the leslie because I wanted to get rid of the bloody cable. Nevertheless the preamp has a higher sensitivity and might add some distortion as well.

Michael

W DeMarco

DIY: Leslie Combo Preamp
« Reply #6 on: June 28, 2007, 10:21:42 AM »

nathun

DIY: Leslie Combo Preamp
« Reply #7 on: June 28, 2007, 02:42:09 PM »
I've been wanting to do the same thing.  I like running my rhodes through the leslie, but I'm having to pass the rhodes through the hammond right now.  I'd love to have the standalone preamp so I could take the lesle and rhodes places and leave the organ at home.  I'd love to hear if anyone manges to build one (especially a tubeless version), cause I'll probably try myself at some point.

pucho812

DIY: Leslie Combo Preamp
« Reply #8 on: July 02, 2007, 01:08:25 PM »
Quote from: "fazeka"
FWIW, it's available here.


Yes that is the schematic... Here are the new replacements  for the transistors/DIODE. they are all made by NTE


For the Diode use a NTE 117 which is a general purpose rectifier

For q1 and q2 on the schematic, Use a NTE123AP which is an npn transistor

For q3 and q4 use a NTE199 which is a high gain amplifier another npn transistor

lastly for q5 use an NTE128(NPN) audio output/video driver...
You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is.

lanxe

DIY: Leslie Combo Preamp
« Reply #9 on: July 03, 2007, 10:30:06 AM »
Quote from: "pucho812"
Quote from: "fazeka"
FWIW, it's available here.


Yes that is the schematic... Here are the new replacements  for the transistors/DIODE. they are all made by NTE


For the Diode use a NTE 117 which is a general purpose rectifier

For q1 and q2 on the schematic, Use a NTE123AP which is an npn transistor

For q3 and q4 use a NTE199 which is a high gain amplifier another npn transistor

lastly for q5 use an NTE128(NPN) audio output/video driver...


Cool, thats waht i needed to know. Thanks pucho.
Ryan
Ryan


pucho812

DIY: Leslie Combo Preamp
« Reply #10 on: July 03, 2007, 11:20:26 AM »
anytime :cool:
You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is.

lanxe

DIY: Leslie Combo Preamp
« Reply #11 on: July 05, 2007, 07:49:17 PM »
Ok,
I am going to mill some PCB's soon (i may make a couple if anybody is interested in one). It will be the same layout as the links provided from captainfoldback.

I had a couple of questions though.........just double checking.

for the transformer T1
is the secondary 34VAC ? or is that after D1.....ie if i buy a 34VAC trasformer, i will be ok?

some of the capacitor labels are throwing me off too. like look at C8 that is labeled 200/50 ...... does that mean a 200uF 50V cap? how about C5 that is labeled 50/15.......50uF 15V? i am a bit confused with that.

Other than that, i think it should be pretty easy to do. oh, here is the schematic.


Thanks again,
Ryan
Ryan

pucho812

DIY: Leslie Combo Preamp
« Reply #12 on: July 06, 2007, 10:53:09 AM »
yes it's a 34V secondary on the transformer.   Yes the cays are 200UF/50V and so on...

We have a guy right now at work who is making one on breadboard. Only problem he ran into was he was sent a 8 pin Amphenol instead of a 6 pin. mistake on the company he purchased it from... But it happens
You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is.


 

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