Franz
New Member
Posts: 115
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Post by Franz on Sept 25, 2008 22:12:32 GMT -5
Let's say you have a combo sporting integrated circuits, and the every C on it plays at a low volume (but isn't dead), what is that symptomatic of? Something small like a loose wire, or something major like a dead oscillator?
Now let's say JUST ONE note is quiet...is that the same problem, or just a dirty contact?
Thanks!
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Post by karl on Sept 25, 2008 23:54:03 GMT -5
Hello Franz,
To start out, clean all the key contacts first. What kind of combo are we talking about? There are many different ways to answer this question.
Of the Ones with IC's in it: The early ones use a set of master oscillators for all the high notes with divide down integrated circuits, to generate each octave. If all the C notes play, but are a lower volume than the rest. ( but are still a C note ) The oscillator works but something is pulling down the signal to each note. possibly a bypass capacitor in the signal chain. A low volume note would indicate a problem with one of the divide down circuits. This could be an old capacitor, a bad solder joint, loose wire or a dirty contact.
Newer units may have a large integrated circuit which handles all of the above mentioned functions. This Integrated circuit could be failed and that would be a hard chip to find. On the other hand this could be bad solder joints, loose wires, dirty contacts, etc. Best Regards Karl
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Post by mtwallet on Sept 26, 2008 2:27:21 GMT -5
let us know what kinda organ is this
if all the C's are low, I would check the transistor of the 1st division
if only one C is quiet, I'd check the key itself and its wires, and then the division concerned by this note
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Franz
New Member
Posts: 115
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Post by Franz on Sept 26, 2008 10:20:46 GMT -5
Wurlitzer 7300 ....I'm a real idiot with electronics. So let me know if something I could feasibly fix myself, i.e. clean something or reattach something obvious.
Thanks a ton guys!
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Post by fleshtonejm on Oct 1, 2008 13:33:51 GMT -5
I've had that issue with my continental: all C's (coincidently) were getting very quiet after a couple of hours of rehearsal, until they went quiet all the time. A transistor had blown, don't ask me where on the tone generator, I wouldn't know. I've had it fixed by this old guy who used to be a techy back in the 70's;
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Franz
New Member
Posts: 115
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Post by Franz on Oct 1, 2008 18:15:03 GMT -5
I'm getting the impression this could be serious, especially without the part.
And now I've got issues with my Mini Compact. Dratts!
Anyways, thanks everyone for your help.
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Post by Rod MPS on Oct 1, 2008 22:57:09 GMT -5
I think that we will always have issues like these with 30-40 year old instruments. Things go bad over time even when thy are well cared for. Many of these instruments were exposed to the most destructive force in nature back in the 60's... teenagers! Bounced and banged in and out of car trunks and vans, soaked in beer and coated with tobacco smoke, eventually left to rot in a dank basement or garage for decades.
It is a wonder that any of these things still work!
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Post by fleshtonejm on Oct 2, 2008 4:54:02 GMT -5
Well, I must say this is description fits me pretty well, except for the smoke part since I dont smoke. oh, I'm not a teenager any longer, well on my ID that is... ;D
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Post by arch on Oct 4, 2008 19:56:56 GMT -5
Rod, I agree. Just reading some of Karl's post have help me trouble shoot that Kustom. It not only was beat up (in road cases), beer spillt on it. ( brown thick stuff under the keys). I played a place in in a basement setting where the cold water feed was right above where me and the bass amp were. The more people, the more condensation on the pipe. It would get so bad that i would get shocked through the water on the keys. I read all the post at work , but the filter will not let me log in. And I seldom have time to get on line at home. Love the site. Arch
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