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Hey Stephen

I built the heritage B15, but added your heater elevation circuit before the 1st filter stage of the Ampeg circuit. The amp runs great, but I have a stubborn hum that can only be eliminated by turning the humpot really off centre. I get 1.4V at one side and 4.8V at the other side.
Do you connect your HT CT at the negative side of C21 ?

At the Hoffman site people advise against heater elevation and I argued that. I told that you must have implemented it for some reason and that I trust your expertise on this. Mainly because the 2x 47uf 450V series filtercaps seem more reliable than one 50uf 500V on the Ampeg. Could you shed a light on why you decided to do the heater elevation? Thanks

Also.. Ampeg has only one ground point whereas you and all 18W circuits have 2. I did the 2 ground circuit.. one for preamp and one for all others. It has always worked super for me. Why would Ampeg do it the other way? Any ideas?
Thanks

Bjorn

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You should check to see why there is a stubborn humming sound in the Amplifier. It may be due to incorrect installation using the 2x 47uf 450V line filter cap.

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While both approaches can be effective, it's essential to ensure proper grounding techniques are followed to maintain signal integrity and minimize noise.strands

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