leslie 145

[Guest]

hi guys .can anyone tell me how to up the volume on the treble horns? they just seem too weak and just not clear and cutting like some leslies i ve played with.Also there is a loud pop when i switch from tremlo to chorale,can anyone shed any light on these problems? please

[geoelectro]

Re: leslie 145




Since 145/147 Leslies switch with AC, they tend to have switching noise more so those that switch with DC voltage. There are three noise suppression capacitors you should check or possibly replace. All three are 0.1 MFD @ 600V. One is across the leslie switch, and the other two are located on the motor outlets. They parallel the relay contacts. You might also see if you can burnish the relay contacts as they are probably pitted.</p>


As for more treble, make sure the amp is fully up to spec. Coupling capacitors could be bad. Check your voltages and make sure they are right.</p>



Click here and follow links to servicing the 147 Leslie for info on voltages etc.You might have a weak upper driver. It's hard to check that without just replacing it for comparison. In some cases, an improper woofer can drag down the amp. I've found 4 and 8 ohm woofers in Leslies and of course they are supposed to be 16 ohms.</p>

George
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[Guest]

Re: leslie 145

thanks for the reply,i ll go and check that speaker .does the console resistance setting on the leslie amphave anything to do with it and what should it be on? I have a hammond m102. many thanks. john

[geoelectro]

Re: leslie 145



That resistance is set to 8 or 16 ohm to match your organ source impedance. If you turn off the organ speakers to play the Leslie by itself, the speaker load is needed in the Leslie to keep your organ amp from being damaged.</p>

You shouldn't notice any difference in sound in either position. The open position however may be really loud since it's expecting a line level. Also, you then lose your load. I believe your setting should be set to 8 ohm.</p>

George
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[Guest]

Re: leslie 145

thanks for that, i ve also noticed that today there is a flash of light from underneath the leslie amp when switching from fast to slow as well as the clickin noise. I don t know wots doin this in the amp but is this normal or dangerous. I m new to all of thisso if you could explain the solution in the most simple of ways i would bevery grateful. thanks very much. john

[Guest]

Re: leslie 145

PS . The clickin noise is coming thru the organ internal speakers as well as the leslie

[geoelectro]

Re: leslie 145



There is an open frame relay under the Leslie chassis. As the contacts get bad, they produce more arcing. Also, there are several arc suppression capacitors that may need replacing. Two are located under the Leslie chassis mounted to the AC receptacles that the Leslie motors plug into. They are 0.1 mfd @ 600 Vdc. Also, there is one across the relay coil. This one is located right on the back of the 6-pin plug that the Leslie cable plugs into, pin 2 &amp; 5. The same 0.1 mfd @ 600 Vdc. These will help in reducing the contact arcing and help with the clicking or popping noise.</p>

Lastly, using a burnishing tool, you can help prolong the contact life by burnishing them so they are smooth again. (or use 600 grit sandpaper)</p>

George
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[Guest]

Re: leslie 145

thanks very much george, you ve been a great help.i will try to track down these capacitors and change them .brilliant