[HAM] PR-40 Slight Problem might need help

Mon Aug 14 01:32:55 CDT 2006

here's the original email.

organtec <organtec at charter.net> wrote:  No, it just needs a balanced line in to feed both G1 and G2 inputs. Neither
of those goes to ground.

-----Original Message-----
From: hammond-bounces at zeni.net [mailto:hammond-bounces at zeni.net]On
Behalf Of Alan Kranpost
Sent: Tuesday, July 25, 2006 5:36 PM
To: The Hammond Forum
Subject: Re: [HAM] PR-40 Slight Problem might need help

I see do you mean it should only be used with a B3 ?

I had it running good though until that cap went.Runs perfect with the
treble reverb on so it seems like the line is balanced enough i'm pretty
sure.

organtec wrote:
You HAVE to feed the PR-40 a balanced signal.

-----Original Message-----
From: hammond-bounces at zeni.net [mailto:hammond-bounces at zeni.net]On
Behalf Of Alan Kranpost
Sent: Monday, July 24, 2006 9:31 PM
To: strangewarrior1 at earthlink.net; The Hammond Forum
Subject: Re: [HAM] PR-40 Slight Problem might need help

It's an L-112 ,a Leslie 145 and Pr-40. At the 5 pin female in the back of
the l-112 PIN 1 IS SIGNAL POSITIVE AND PIN 5 IS SIGNAL NEUTRAL. THEN IF I
REMEMBER RIGHT 2 AND 4 PIN SLOT ARE 120 VOLT AND PIN 3 IS GROUND.

WHEN I PUT THE REVERB ON THE PR-40,,THE REVERB WORKS AND IT IS VERY QUIET
AND WORKS PERECTLY.IT'S WHEN THE PR-40 TREBLE REVERB IS OFF ON THE PR-40 IS
WHEN THE SLIGHT HUM AT THE 12 INCH REVERB SPEAKER HAPPENS JUST TO CLEARIFY
THE PROBLEM.

THE LESLIE IS WORKING GREAT.I MADE MY OWN Y SPLITTER AT THE BACK OF THE
ORGAN.I'LL FIGURE IT OUT EVENTUALLY.

Michael Fulk wrote:
Yoi must understand the "Leslie-proofing" that Hammond did to the PR-40 in
order to get yor reverb back.......study the schematic or call me at
707-274-8979...........or perhaps someone who can type better than me will
give on-line help.

Both pins aone *and* six are both "positive" or "hot"; pin two is ground.

G1 and G2 stand for Grid one and Grid 2, and always did on Hammond
Schematics......in this case the two grids on V1, a 12AU7.

I wish you much luck.
Mike Fulk

> [Original Message]
> From: Alan Kranpost
> To:
> Date: 7/23/2006 2:27:09 PM
> Subject: [HAM] PR-40 Slight Problem might need help
>
> Hello,I'm just about done changing all the electrolytics on my mid 1961
PR-40.A week ago i had the swirling bad capapcitor sound and so i changed
Caps 33,34.35 which are all 3 uF,50V..That got rid of the bad cap
sound.Only 2 caps that haven't been changed yet are by the transistor caps
#30, and #32 which are 100 uF/3V ..
> I'm, getting a low hum but pretty noticeable at the Treble reverb 12"
speaker only and when Treble reverb is turned off.As soon as i turn ON
Treble Reverb everything is absolutely perfect 100% No hum,Not even any
hiss at all it's unbelievable how quiet.
> I have a volume kit which mounts in front of the organ and it had the 5
pin female connector box which mounts in the back of the organ and i
noticed that Pin#1 is +positive signal.
> When i hooked up a Leslie 145 i had to do a special cable so that Pin#1
positive signal would goto to pin 6 on the leslie.
> Now i'm looking at the schematic of PR-40 In the Middle of the page and
it says "SUPPLIES DIRECT SIGNAL WHEN TREBLE REVERB IS OFF" and points to
connection G1 which might not be my +positive signal wire and mine might be
G2.I'll have to look later and inspect but something i think is possible
and i should remember to check.
>
> There's a good chance i'm going to go ahead and change the last 2
100uF/3V caps that havent been change even though the caps i got are
sprauge metal axial with a date of like 1992 on believe on them so i;m
slightly hessitant to do it unless needed.
>
> Those last caps i just changed were a real bitch with 3 heatsinks
needed at one time was really tough and i hope i didn't overheat any of
those 3 --caps 33,34,35.Also the leads on the caps were really thin so it
was tough to get them in the solder pots without bending quite a bit.
> Thanks in advance if anyone's seen this before and can help alittle
from AL in staten Island NY

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