Running AO-29 with TG stopped, Field Coil Question

[Guest]

I'm doing a bit of tinkering with my M3 and had a couple of questions.</p>

1. Would it hurt anything to leave the Run switch on with out having started up the tone wheel generator first?</p>

2. What are the details on the power for the field coil itself? </p>

[Guest]

Re: Running AO-29 with TG stopped, Field Coil Question

To clarify the first question a bit. The run motor is the bit I'm curious about. If it has current running to it, but is not spinning, can that cause any problems?

[TheAdmiral]

Re: Running AO-29 with TG stopped, Field Coil Question



Not for a short while. Why would you want to do that other than test the amp? Longer time might be bad for run motor.</p>

What kind of details do you want on the FC speaker? Oldest ones are 1000 ohms resistance and later ones are 700 ohms.
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[Guest]

Re: Running AO-29 with TG stopped, Field Coil Question



I'm curious about what kind of sound I could get running the internal Jensen from an Epiphone Valve Jr for recording a resonator equipped with a Fishman piezo. Naturally, it being a field coil, the coil needs to be energized for it to function. The AO-29 knows how to do that obviously, but although the TG is pretty quiet - it's not quiet enough for recording.</p>

The second question is due to the fact that I pulled another nice field coil out of an S Model chord organ, but am not sure on what kind of power the coil would need to run it from the tube head.</p>

[TheAdmiral]

Re: Running AO-29 with TG stopped, Field Coil Question



I would disconnect the wire to the run motor if you're doing that. You could put a spst switch to do that.</p>

You need a schematic for the chord organ to get the FC info.
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[Model E & Me]

Re: Running AO-29 with TG stopped, Field Coil Question

I would second TheAdmiral's advice. Energizing a stopped ac motor will cause currents to be induced in the rotor which will cause the rotor to heat up. If left for any length of time, damage could occur. Hardly worth the risk.

[Guest]

Re: Running AO-29 with TG stopped, Field Coil Question



I thought that might be the case (which is why I thought I would ask yall before fiddlin with anything). And I see the Admiral is already onto my next line of thought, haha.</p>

3. Can it hurt anything to drop a switch in to disable the run motor? And if not, which wire (if any) would be best to interrupt?</p>

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