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[Drawbar Dave]

All the UK L100s and M100s I've owned and serviced for customers have been grounded from the factory.

[Drawbar Dave]

I’d always take a 330 over an 860 and they’re usually cheaper in my experience....

[Drawbar Dave]

Check the green/yellow wires from the switch box and ensure they are well connected to the preamp.

[Drawbar Dave]

I think I have a couple of scrap AO43’s in my workshop. You can get in touch through my website in my signature below.

[Drawbar Dave]

When the B natural is up, the switch grounds the wire. When it is depressed the ground connection is broken. It's a non latching momentary type switc...

[Drawbar Dave]

Well done! It will be well worth it, they're fantastic organs to play. I restored my second Duo about 8 years ago and it's still going strong....

[Drawbar Dave]

You can swap the LDR wiring round so that the LM and UM sensors are reversed to eliminate that. The bulb is fed from the 9 vac circuit iirc. My Duo had...

[Drawbar Dave]

Thanks for sharing Jim. It's only a matter of time before I have to tackle one of these!

[Drawbar Dave]

Your kit seems ok then. Next I’d be looking at the relay as the possible culprit and swapping the 12AU7’s on the Leslie amp....

[Drawbar Dave]

I have experienced a failed 0.015uF orange drop in a customer’s 122 amp that had been completely rebuilt a couple of years previously by his former...

[Drawbar Dave]

The fact that it took longer for the issue to appear with the amp on its side indicates to me something failing as it warms up. I would try a can of compressed...

[Drawbar Dave]

Poking around with a chopstick or other non conductive probe to seek bad connections. I use plastic knitting needles for this.

[Drawbar Dave]

Yes if it’s the original cap it should be changed regardless. I’ve had first hand experience of them exploding without any symptoms of pitch problems....

[Drawbar Dave]

The tube amp that you are trying to drive the 760 with at the moment probably does not have a hot enough output. My tube pres such as an Alembic F2B are...

[Drawbar Dave]

I’ll ask Adrian to post it on there for me as I still can’t access that page. He’s already posted it for me on his Alan Haven page.