Have a C3 with a rumble in the speakers. It was intermitant but now its constant. What would be the most likely component that needs to be replaced?
Is it the Leslie speaker? If so, they need to be oiled (JUST A DROP OR TWO!!) about once a year. If it is the regular speakers, one of them could have a torn paper cone. This will cause a rattling type of sound. If you can visually inspect them and the look good, then it is probably the power amplifier. If you are going to attempt the repair yourself, I can try and locate a service manual for you.
I don't see anything on the speaker cabinet that indicates it is a Leslie. The plate in the cabinet says HR40 serial#83726. There are oil tubes on the left side covered with a cloth sock and the y have long springs going down thru them. Where would I get oil for a Hammond Organ and whereis a supplier for rebuilt pwr amps for something built in 1957. Thanks Mark.
I will get back to you tonight have to work a bit. I'm in the Pacific time zone, so it will be about 7 or so PST. I'll find you a source for a power amp. Meanwhile, I would physically feel the speaker cones and visually inspect them for damage.
I'm changing this to Q & A mode.
I have built and serviced hundreds of electronic musical instruments.
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Here are some things I found:ebay C3 service manual - $2.20 with free shipping!http://www.ebay.com/itm/Hammond-Model-B3-C3-Organ-Service-Manual-/220864310575?pt=Vintage_Electronics_R2&hash=item336c89ed2f
$2.95 with free shippinghttp://www.ebay.com/itm/Hammond-Organ-B-3-B3-C-3-C3-Service-Manual-/130481610386?pt=Vintage_Electronics_R2&hash=item1e614f5e92Jensen 15" speakerhttp://www.ebay.com/itm/Jensen-Speaker-C15L-HAMMOND-ORGAN-B3-C3-/180678073178?pt=Vintage_Electronics_R2&hash=item2a11409b5aThe amplifiers are REALLY hard to find, I looked around quite a bit. But if you keep searching, you'll find one. Ebay is not always the best for things like that. Here are a couple of sources to check with:Parts:http://www.bborgan.com/http://www.theatreorgans.com/hammond/faq/shopservman/Parts/Parts_Suppliers.htmhttp://halfmoonelectronics.com/ Hammond oil can be found here: (an 8 year supply is 9 bucks, a little goes a LONG way!) http://bborgan.com/hammond-generator-oil.htmlI would get the service manual first, spend a little time with it, do some testing and diagnostics, and then go shopping. Good Luck! Thanks for the accept!