Help: Leslie suddenly makes no sound

[ValveTone]

Hello!

I just installed a mint condition M3 in my studio. It came with a
Leslie 25 (no internal amp) and the appropriate set of half-moon
switches. All items were operational till and hour after the move.

The M3 sounds great, and appears to be in perfect working order after
the move. The TWG and reverb were both correctly locked-down before
the move. The internal speaker and internal sound are great. The verb
sounds excellent.

The problem: When I connected the Leslie 25 after the move (the cord
is old and slightly roughed up), everything sound fine for a few
minutes and the tremolo and echo switches were doing their jobs.

Then, when on maybe 3/4 volume on the M3, and playing in the upper
registers, the Leslie sounded crackly, slightly intermittant and
distorted. Lower volumes and lower keys were better. Then, the sound
just went out. The tremelo and echo switches still work fine; the
rotor is correctly controlled and spinning freely; just no sound. The
M3 still sounds clear as a bell internally.

Thoughts?

I want to figure out what's wrong (is it something in the M3 or did
the 25's speaker blow, or..._, not so much to get the 25 working, but
b/c I have a sweet, rebuilt 2-speed 45 Im installing this week, and if
there is some problem with the M3's output, I don't want to damage the
45...

Any help would be MUCH appreciated!!!

Thanks,
Damon

[Randy Hunt]

In article <50f12382.0406...@posting.google.com>,
awak...@hotmail.com says...

Well based on what you described, I'd say that you may have lost the
speaker in the leslie. You stated that the leslie has no amp and that
the M3 still sounds fine. Well the amp in the M3 powers both set of
speakers in this case and switching off the leslie the sound returns.
I'd say you need a speaker.

Randy

[ValveTone]

Randy Hunt <rhun...@tco.net> wrote in message

> Well based on what you described, I'd say that you may have lost the
> speaker in the leslie. You stated that the leslie has no amp and that
> the M3 still sounds fine. Well the amp in the M3 powers both set of
> speakers in this case and switching off the leslie the sound returns.
> I'd say you need a speaker.
>
> Randy

Randy,

Thanks for the insight; I was pretty sure (and hoping) that that was
the case, as a speaker replacement is well within my technical skills!

So, you think the M3 is safe to hook my other (more precious) Leslie
45 to?

Damon

[Randy Hunt]

In article <50f12382.04063...@posting.google.com>,
awak...@hotmail.com says...

I don't see why not if you are using the proper interface kit.

[ValveTone]

Randy Hunt <rhun...@tco.net> wrote in message news:<MPG.1b4d47958...@news.tco.net>...
> In article <50f12382.04063...@posting.google.com>,

Damon
> >
> I don't see why not if you are using the proper interface kit.

Yep, I am. The 25 and 45 use the same kit.

Thanks!

Damon

[Doug Schultz]

not sure which cable this setup uses but it might be worth while to make
sure the speaker is bad in the leslie
you can use a 9V battery across the speaker terminals.
use a pair of aligator clips and clip the - bat terminal to the -spkr
terminal then just tap the positive on the + spkr terminal
it will tell you if the speaker has any life in it or not
if it moves and makes sound then you should see if you can hook up an amp
directly to the speaker and run some tone into it
I have a feeling it is maybe the cabling has failed on you .
you could also use a meter to see if all the wires in your cable have
continuity.

Doug

"ValveTone" <awak...@hotmail.com> wrote in message
news:50f12382.0406...@posting.google.com...

[Randy Hunt]

In article <du4Fc.964271$oR5.309456@pd7tw3no>,
Douglas...@hotmail.com says...

The problem with older speakers is that the glue that holds the voice
coil to the bobbin goes bad with age. After a while the speaker starts
losing volume and makes scratching sounds, then eventually stops working.
What happens is the voice coils itself comes off the bobbin and gets
stuck down in the magnet assembly. Probably the best/easiest thing to do
is to substitute a know good speaker at the speaker leads. This will
determine if everything else is ok or not in one test. If you don't have
a exact replacement, thats ok for the test. This is a go/no go type of
test. Just don't crank the power to the replacement speaker.

Randy

[ValveTone]

"Doug Schultz" <Douglas...@hotmail.com> wrote in message news:<du4Fc.964271$oR5.309456@pd7tw3no>...

> not sure which cable this setup uses but it might be worth while to make
> sure the speaker is bad in the leslie
> you can use a 9V battery across the speaker terminals.
> use a pair of aligator clips and clip the - bat terminal to the -spkr
> terminal then just tap the positive on the + spkr terminal
> it will tell you if the speaker has any life in it or not
> if it moves and makes sound then you should see if you can hook up an amp
> directly to the speaker and run some tone into it
> I have a feeling it is maybe the cabling has failed on you .
> you could also use a meter to see if all the wires in your cable have
> continuity.
>
> Doug

Doug,

I will certainly test the speaker directly that way. It uses the 6
pin Wurl/Universal cable format (same as the 25, 45, etc). I had
tested the cable several days before (it looks a little rough), and
had continuity on all connections, but I will test it again!