[HAM] PR-40 Slight Problem might need helpAlan Kranpost albaners at yahoo.comMon Aug 14 09:49:31 CDT 2006
Oh i see.This would mean that i would have to hookup pins #1 and #6 att he pr-40 or the cable to the primary of a certain size transformer then attach the secondary to pins #1 and #6 at the pr-40 input.. you know that volume control i showed has a transformer in it but is called a coupling transformer as in here is the schematic for that. http://home.earthlink.net/~akranpost1/sitebuildercontent/sitebuilderpictures/schematic.jpg http://home.earthlink.net/~akranpost1/sitebuildercontent/sitebuilderpictures/_volumecontrol.jpg Notice on the primary they make you hook up the Green or the Black wire depending on if it is a spinet or console as it says on the very bottom. if there's nothing that will help there would you know what i'm looking for in a transformer Primary and secondary.i usually buy from tubesandmore.com they might have some. i see there's like 10 to 15 different transformers at tubesandmore.Most like it is an audio output transformer i bet.there 28 to chose from.any idea which one i need .thanks organtec <organtec at charter.net> wrote: What about the bass reverb? No you can't do that. All you need to change from unbalanced to balanced is to put a transformer in line from your L to yhe PR-40 ----- Original Message ----- From: "Alan Kranpost" To: "The Hammond Forum" Sent: Monday, August 14, 2006 2:27 AM Subject: Re: [HAM] PR-40 Slight Problem might need help How about if i remove the springs on the necklace reverb and in place added just a regular wire.Since it works perfect with treble reverb on.i dont have a balanced line cause it's a L-112. I guess you guy's really don't know your stuff as much as i thought or only know b3's. Obviously there's a workaround cause it works perfect with the treble reverb on. Alan Kranpost wrote: Oh i remember now.Balanced lines like of Hammond Console organs and these balanced lined organs work best with the Leslie 122 because it was made for balanced lined console's.I've read you guy's talking about this a few times but i didn't know the Pr-40 was the same.I'm just an former electrician whose recapped alot of amps but never read any tube amp books yet,but i did read alot online about do's and don'ts and alot of other stuff. So is there anything i can do.Even though the hum isn't that bad really when treble reverb is off but it would be nice to get it perfect if possible no hum with treble reverb off.The L-112 has a reverb in it already and is suffient. Like i said it's an L-112 with a volume control like this one http://home.earthlink.net/~akranpost1/sitebuildercontent/sitebuilderpictures /_volumecontrol.jpg which came with the 5 pin female output box. I got out 5 jumpers today and tried switching Pin 1 with Pin 6 at the Pr-40 and it just seemed louder is all but not positive have to check it both ways tomorrow again. ..it didn't help anything. I checked out the treble reverb switch thouroghly and traced all wires from it and made sure all wires and switch are perfect. So it's totally perfect with the Treble reverb switch on ,,,but i looked at the schematic and it dosen't seem possible to bypass the pr-40 necklace reverb unit right ??? I just though that i could dissconnect the wires to the treble reverb 12" speaker and substitute a dummy load ???? what do ya think ?? and what would the dummy load be ?? 5ohm 10% resistor ? Man o man when i switched those signal wires today it was sooo loud.I was really getting into it. Sorry if this came up before and i didn't save it to file on the harddrive.Which i've done with some subjects of hammond stuff.I hope something can be done.thanks from AL organtec 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 -- Subscription Options/Unsubscribe/Archives: http://www.zeni.net/hf/ Hammond-Leslie FAQ: http://theatreorgans.com/hammond/faq/ HammondWiki: http://www.dairiki.org/HammondWiki/ hammond at zk3.dec.com archives: http://zk3.hammondforum.com/ --------------------------------- See the all-new, redesigned Yahoo.com. 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