[HAM] Leslie 122 Amp Question

[Jim Shanks]

Scott Hawthorn wrote:
> At 12:47 PM 6/4/2008, Jim Shanks wrote:
>   
>>> At 10:37 PM 6/3/2008, Jim Shanks wrote:
>>>       
>>>> Hi All,
>>>> I have a Leslie 122R amplifier that's been subjected to some very
>>>> creative repair.  Looks like whomever fixed it couldn't find the
>>>> 30/30/30/10 can cap so they just wired in a bunch of 22mf caps.
>>>> Following the schematics, it looks like one of them is even wired
>>>> wrong.  Plus wires were moved from original locations to accommodate the
>>>> mods and other components a just plain wrong.  Not surprisingly, it
>>>> doesn't sound like it should.
>>>> Anyway, I have the right parts, and service instructions and
>>>> schematics.  What I don't have is a photo of a 122 amp that's put
>>>> together correctly.  A picture or diagram would be real helpful in
>>>> properly placing the correct components as well as getting the right
>>>> colors on the wires.
>>>> Anyone know of a source or have a high res digital photo of the
>>>> underside of a 122 amp?
>>>>         
>>> Jim, there are a couple of problems with this approach. If this amp has
>>> indeed been modified so irresponsibly, the wire colors could well have
>>> changed. What if, for example,  you were to see an orange wire in the
>>> picture hooked up to C56 +, but the orange wire was now doing something
>>> else? And, no matter how beautifully photographed, I don't think I would
>>> be
>>> at all comfortable with following what I think I see in such a photo. The
>>> only way to wire this amp right, in my humble opinion, is with a complete
>>> understanding of what you see on the schematic.
>>>
>>> The first, and easiest part, is that a terminal trip long enough to hold
>>> the three or four largest electrolytics can have the ground side bridged
>>> across the lugs with grounding wire.
>>>       
>> Hi Steve,
>>     
>
> The name is Scott.
>   

Hi Scott,

I sincerely apologize for getting the name wrong.  I was at work an 
dealing with about three things at once.  I hope I never do that again, 
and consider that the worst form of insult.  Please accept the apology 
on this one.

Thanks for all the help,
Jim
>   
>> I don't plan on trying to copy a picture to get mine right
>> except to the extent that I would like the color codes and position of the
>> components to match an original as closely as possible
>>     
>
> It won't be easy finding orange or purple wire.
>
>   
>> the only other thing
>> I see that's out of spec is the DC motor brake circuit was disabled by
>> clipping one lead of the capacitor.
>>     
>
> 122s never came with brakes. What's the deal with that???
>
>   
>> I also noticed that the output tubes, while matched on brand, are not
>> matched.  That doesn't mean they aren't biased correctly, but I doubt it.
>>     
>
> Leslie amps are self-biasing; you don't bias them.
>
>
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