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Here is the picture and you might see in front sitting the Dave Slagle’s MF filtering choke, It is not shield but is hangs along relatively far from anything AC-annoying.  I did not measure the filer yet but subjectively it sounds fine, somewhere where it shall be.

The front end is very much is done permanently and might be closed up. I was playing today the MF channels, trying to evaluate if the non- shield choke would pick up some noise. I am not sure if it does as generally the amp I would call it “noisy”. It is not the I can hear “noise” at listening position but if I stick my heard into the horn then it certainly has some noise and the most important is that I do not really like the harmonics of THAT noise.

Well, I am not alerted yet as the amp if not close up, the output stage is sitting outside and it might suck garbage from anywhere. Still I ma so accustomed for absolute silence from my horn that whatever minor the DHT does is sound different. At this point I am not considering the DC filaments, let see how it will behave when I close it up. Funny is that with this topology it is hard to figure out where the noise is coming from – the front or back end….

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