Gary75 Posted January 25, 2019 Share Posted January 25, 2019 I have a late model C3 with this issue. Dendrites on the scanner? I have had it before and applied voltage across the scanner which seemed to cure it. Its a cyclic noise as you can hear, and responds to volume pedal. However does not respond to vib switches. It sounds like an electrical crackle. Any input would be greatly appreciated. [video:youtube]2gO4WVA0KjM Link to comment Share on other sites More sharing options...
mate stubb Posted January 25, 2019 Share Posted January 25, 2019 That's ugly! Almost sounds like a mechanical noise with a pickup that got jammed in and is hitting a tonewheel. Moe --- Link to comment Share on other sites More sharing options...
Delaware Dave Posted January 25, 2019 Share Posted January 25, 2019 hmm, here is a video of a hammond with dendrite [video:youtube] It typically isn't heard until you play notes then you can hear a "motor boating" as you are playing. You're getting noise without even touching the keys. Sounds like a tonewheel issue to me. Let see what others weigh in on as a source...... 57 Hammond B3; 69 Hammond L100P; 68 Leslie 122; Kurzweil Forte7 & PC3; M-Audio Code 61; Voce V5+; Neo Vent; EV ELX112P; GSI Gemini & Burn Delaware Dave Exit93band Link to comment Share on other sites More sharing options...
WesG Posted January 25, 2019 Share Posted January 25, 2019 Is that noise coming through the Leslie? Does turning off vibrato/chorus on both manuals make it stop? Does the expression pedal affect it? Hammond: L111, M100, M3, BC, CV, Franken CV, A100, D152, C3, B3 Leslie: 710, 760, 51C, 147, 145, 122, 22H, 31H Yamaha: CP4, DGX-620, DX7II-FD-E!, PF85, DX9 Roland: VR-09, RD-800 Link to comment Share on other sites More sharing options...
Gary75 Posted January 25, 2019 Author Share Posted January 25, 2019 Is that noise coming through the Leslie? Does turning off vibrato/chorus on both manuals make it stop? Does the expression pedal affect it? Expression pedal does indeed make the noise louder or quieter, and its not affected by vib/cho tabs. Noise is through the Leslie Its also intermittent and not apparent all the time so not sure if it would be a mechanical issue on the TG as that would be constant surely? Link to comment Share on other sites More sharing options...
Delaware Dave Posted January 25, 2019 Share Posted January 25, 2019 I would also post here ... https://organforum.com/forums/forum/electronic-organs-midi/hammond-organs?24-Hammond-Organs= 57 Hammond B3; 69 Hammond L100P; 68 Leslie 122; Kurzweil Forte7 & PC3; M-Audio Code 61; Voce V5+; Neo Vent; EV ELX112P; GSI Gemini & Burn Delaware Dave Exit93band Link to comment Share on other sites More sharing options...
Gary75 Posted January 26, 2019 Author Share Posted January 26, 2019 Ah ok thanks, Ill do that. Link to comment Share on other sites More sharing options...
JoJoB3 Posted January 26, 2019 Share Posted January 26, 2019 This series will get ya back. Complete with star wars style credits too! shocking the scanner is temp anyway if it's bad (usually is). [video:youtube]dpcxQync5B4 Link to comment Share on other sites More sharing options...
Gary75 Posted January 26, 2019 Author Share Posted January 26, 2019 You reckon it could be the scanner then JoJo? Link to comment Share on other sites More sharing options...
Legatoboy Posted January 26, 2019 Share Posted January 26, 2019 If you turn of the Chorus/Vib off and it's still there, I don't believe it's the scanner... I have had to hit my B3 and number of times with the Battery fix.. when I turned my C/V off it didn't motorboat even when it needed it... This is more likely the problem from > . . Matt: "That's ugly! Almost sounds like a mechanical noise with a pickup that got jammed in and is hitting a tonewheel." . . . .it does sound like that, Matt is right! Motorboating is more subtle than the sound your getting in your vid.. At least from my experience. I'd open the back and see if any of the Tonewheel pickup adjustments with the locking screws seem loose on the side of the Generator you can get to 1st... easy does it in there. Turn the instrument off, ah you know the routine... Good Luck! CP-50, YC 73, FP-80, PX5-S, NE-5d61, Kurzweil SP6, XK-3, CX-3, Hammond XK-3, Yamaha YUX Upright, '66 B3/Leslie 145/122 Link to comment Share on other sites More sharing options...
WesG Posted January 26, 2019 Share Posted January 26, 2019 I don't think it's your scanner. I think your amp is motorboating. Eliminate the scanner by grounding terminal D on the AO28. Hammond: L111, M100, M3, BC, CV, Franken CV, A100, D152, C3, B3 Leslie: 710, 760, 51C, 147, 145, 122, 22H, 31H Yamaha: CP4, DGX-620, DX7II-FD-E!, PF85, DX9 Roland: VR-09, RD-800 Link to comment Share on other sites More sharing options...
JoJoB3 Posted January 26, 2019 Share Posted January 26, 2019 You reckon it could be the scanner then JoJo? Ooops, sorry. I read this too quickly thinking you already determined it the scanner. No, first isolate and determine the culprit. Could be the amp. Link to comment Share on other sites More sharing options...
WesG Posted January 26, 2019 Share Posted January 26, 2019 If the noise was mechanical, it would not be modulated by the Expression Pedal. Hammond: L111, M100, M3, BC, CV, Franken CV, A100, D152, C3, B3 Leslie: 710, 760, 51C, 147, 145, 122, 22H, 31H Yamaha: CP4, DGX-620, DX7II-FD-E!, PF85, DX9 Roland: VR-09, RD-800 Link to comment Share on other sites More sharing options...
mate stubb Posted January 27, 2019 Share Posted January 27, 2019 Seems to me a pickup striking a tonewheel might generate both a mechanical and an electrical noise. But if the leslie is turned off, is it still heard? Moe --- Link to comment Share on other sites More sharing options...
JoJoB3 Posted January 27, 2019 Share Posted January 27, 2019 I have a late model C3 with this issue. Dendrites on the scanner? I have had it before and applied voltage across the scanner which seemed to cure it. Its a cyclic noise as you can hear, and responds to volume pedal. However does not respond to vib switches. It sounds like an electrical crackle. Any input would be greatly appreciated. [video:youtube]2gO4WVA0KjM I'm sorry, I actually played your youtube vid just now. That isn't scanner motorboating (good news). And no, nothing physical is hitting/etc anything inside (pickup, tonewheels, etc). That's in the amp (likely C3 AO-28 side. ez things to check first: - go over leslie cable - all wire connections, connector socket. Swap in another leslie cable and test if possible. reflow all solder point conections (if you don't know what yer doing with a solder iron get someone who does). - pull each tube in organ, lightly sand tube pins, clean each tube socket with deoxit D5. - deoxit the C3 leslie output socket - check/swap the 12BH7, 12AX7 tubes and test. if the 6x4 is known/unknown old - replace (protects your tformer) - deoxit and excercise the tone ctrl screw (AO-28) start there Link to comment Share on other sites More sharing options...
Gary75 Posted January 27, 2019 Author Share Posted January 27, 2019 Thats what I thought, its not mechanical if the noise can be modulated and isnt constantly there. And the fact the scanner sounds fine in itself also lends me to think it wasnt that. I have a spare Leslie and cable and will start cleaning and checking. Its up at my fathers place so going up tomorrow. I have also purchased a complete mil spec Amphenol EP6 metal plug and chassis socket set for cable and both organ and Leslie amp (as recommended by mate stubb some time ago) to replace the frankly poor plastic design of the originals which inevitably get stood on or worse. Thanks for the input so far, really helps to cut down fault finding time Link to comment Share on other sites More sharing options...
WesG Posted January 27, 2019 Share Posted January 27, 2019 No point in adding a second Leslie to the equation, youve already isolated the problem to the organ by observing that it is modulated with the expression pedal. Your preamp needs service. Who did the last rebuild? Perhaps that person can help. Hammond: L111, M100, M3, BC, CV, Franken CV, A100, D152, C3, B3 Leslie: 710, 760, 51C, 147, 145, 122, 22H, 31H Yamaha: CP4, DGX-620, DX7II-FD-E!, PF85, DX9 Roland: VR-09, RD-800 Link to comment Share on other sites More sharing options...
WesG Posted January 27, 2019 Share Posted January 27, 2019 No point in adding a second Leslie to the equation, youve already isolated the problem to the organ by observing that it is modulated with the expression pedal. Your preamp needs service. Who did the last rebuild? Perhaps that person can help. Hammond: L111, M100, M3, BC, CV, Franken CV, A100, D152, C3, B3 Leslie: 710, 760, 51C, 147, 145, 122, 22H, 31H Yamaha: CP4, DGX-620, DX7II-FD-E!, PF85, DX9 Roland: VR-09, RD-800 Link to comment Share on other sites More sharing options...
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