NAT Audio Generator 120 ? Never heard of 'em.
I notice the AC outlet at the bottom of your photo has a nice scorch mark on it.How do I get myself into these situations...
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It does, but if it didn't then there would be no way to hook up the power transformer.Does that wiring harness get all folded back inside the chassis? Seems like a lot of surplus wire.
There is a pair of Meanwell SMPS in there used for heating the 845s. I can do this with linear supplies off a 12V winding, but it works best to use a pretty hefty filament choke to do that. The switchers are regulated and pretty durable. I even had a tube failure recently where the grid of an output tube melted onto the filament and the SMPS survived and shut itself off in the process of the failure which I believe saved the amp from sustaining any damage.@p
@paulbottlehead Hey Paul what kind of Filament choke you use. Are you using a Common mode choke? What will be the correct value?There is a pair of Meanwell SMPS in there used for heating the 845s. I can do this with linear supplies off a 12V winding, but it works best to use a pretty hefty filament choke to do that. The switchers are regulated and pretty durable. I even had a tube failure recently where the grid of an output tube melted onto the filament and the SMPS survived and shut itself off in the process of the failure which I believe saved the amp from sustaining any damage.
Can you share a little more regarding the circuit? I'm looking for my next build.It was also time to make a new pair of 811A amps.
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I have done a fair bit of purple powder coating and I did up a pair of plates in this nice dark textured purple, and I had leftover purpleheart wood from another job, so it was all here and waiting for me.
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There's not a whole lot going on in these.
The last pair that I have are Chevrolet orange and I'll leave the transformers blue. The sides will be marine grade ultra white HDPE.
ThanksFor a filament choke doing choke input duty, I use PSUD to simulate the supply to figure out what value will work properly to achieve the correct output voltage by trying the standard values in the Hammond catalog. There is no one choke that will just work for everything.
I'm still selling these commercially, so maybe that's best done in PMs?Can you share a little more regarding the circuit? I'm looking for my next build.