Help with Leslie 825

[Tod Treganowan]

Hi,

I just picked up a Leslie 825 in trade for an old midiverb II. I need
help with two things:

1. The thing has been hacked a little. I got a wiring diagram and parts
list and noticed that one electrolytic cap has been removed from the pc
board. The Leslie works rather intermittently (volume fades in and
out...occasionally distorted, etc.) I know it needs caps replaced and
new pots.

Question is: Should I just replace all the electrolytics in the preamp
and power supples, or do the other caps go bad as well? There are a
bunch of smaller ceramics.

2. Someone pulled the "tissue paper absorbent baffling" from the speaker
cabinet. From what is left stuck to the glue, it looks like they were
trying to stop air from the cabinet from going into the rotor part of
the cabinet (there are two notches on the baffle board opening into the
rotor cavity.)

Question: Are these holes supposed to be completely blocked off, or is
the baffle material left open at a specific height above the baffle
board? The manual I have doesn't show the paper baffling.

I'll probably use some mineral wool batts I have to make a new one.

Any help (or pictures would be greatly appreciated)

Tod

--
Tod Treganowan
University of Pgh

Please remove "spammski" from my email address to reply!

[John Jacob]

I suggest you re-post this in the group
alt.music.hammond-organ
there are many techs there that will know the answer to your question.
They are the Hammond-Leslie experts.

John

Tod Treganowan wrote:

> Hi,
>
> I just picked up a Leslie 825 in trade for an old midiverb II. I need
> help with two things:
>
> 1. The thing has been hacked a little. I got a wiring diagram and parts
> list and noticed that one electrolytic cap has been removed from the pc
> board. The Leslie works rather intermittently (volume fades in and
> out...occasionally distorted, etc.) I know it needs caps replaced and
> new pots.
>
> Question is: Should I just replace all the electrolytics in the preamp
> and power supples, or do the other caps go bad as well? There are a
> bunch of smaller ceramics.
>
> 2. Someone pulled the "tissue paper absorbent baffling" from the speaker
> cabinet. From what is left stuck to the glue, it looks like they were
> trying to stop air from the cabinet from going into the rotor part of
> the cabinet (there are two notches on the baffle board opening into the
> rotor cavity.)
>
> Question: Are these holes supposed to be completely blocked off, or is
> the baffle material left open at a specific height above the baffle
> board? The manual I have doesn't show the paper baffling.
>
> I'll probably use some mineral wool batts I have to make a new one.
>
> Any help (or pictures would be greatly appreciated)
>
> Tod
>
> --
> Tod Treganowan
> University of Pgh
>
> Please remove "spammski" from my email address to reply!

[Justin Ulysses Morse]

Tod Treganowan > wrote:

> Question is: Should I just replace all the electrolytics in the preamp
> and power supples, or do the other caps go bad as well? There are a
> bunch of smaller ceramics.

Ceramics almost never fail. Just replace the electrolytics and see
what you have.

> 2. Someone pulled the "tissue paper absorbent baffling" from the speaker
> cabinet. From what is left stuck to the glue, it looks like they were
> trying to stop air from the cabinet from going into the rotor part of
> the cabinet (there are two notches on the baffle board opening into the
> rotor cavity.)

I think this material is only there to prevent the sound of the motor
from coming out where the music's supposed to be. Also, the rotary
baffling would sound less pronounced if sound were leaking out other
openings.


> Question: Are these holes supposed to be completely blocked off, or is
> the baffle material left open at a specific height above the baffle
> board? The manual I have doesn't show the paper baffling.

That I don't know.


ulysses