C3 detuned sound on a few notes

[dweisskeys]

Hi Folks,

I've got a decent sounding C3 with the exception of a couple of notes that have a quivering pitch, like a fast vibrato.
Whichever drawbar is out if that pitch is played the problem occurs. Would it be a tonewheel?

Thanks for your knowledge,

Daniel

[enor]

Yes.

Has it been regularly oiled, with the correct type of oil?

Time how long it takes for the generator to come to a complete stop after shutting off power! A properly lubricated Hammond should have a spin down time of at least 18 seconds or longer.

[dweisskeys]

Regularly oiled, no. It sat in a basement for a very long time before I got it. It is properly oiled now with Hammond oil and it does take 17-18 seconds to stop spinning. Thanks -D

[Jaim]

See if you can identify the tones by using the chart at : http://www.dairiki.org/hammond/wiring/
You can then determine which tone wheels are causing the problem. The tone wheels have springs which allow slippage. If the wheels can't slip then you may hear a slight warble.

Jim

[valotus]

Can be old gummed oil that makes bearing sticky and causes friction, but in the worst case worn or dry bearing sleeve due to lack of oil (which most probably also makes that kind of mechanical howl you don't want to run it at all...).

There is quite a little troubleshooting that can be done without removing generator. Use tone chart to identify which base tone it is, then get another chart that shows tone (pickup) locations both sides of the generator. As there are two tonewheels in the same shaft, you will also find out which tone is paired with the warbling one. Most probably it has warble too.

As you said it has been sleeping for a long time and there are couple of uneven tones, it's most probably gummed oil. The first aid is oiling it good and just waiting for fresh oil to get its way to bearings, which can take pretty long time.

[Hamman]

Tone warble. Insufficient oil getting to the clutches on the individual offending tone wheels.....