Please excuse my drawing, I only put about an hour into it, then had to scan, crop and resize it. Keeping in mind that I'm not an engineer, I came up with a combined schematic. The power supply is custom and mostly of European interest, so we here in the US would have to hack one together, which wouldn't be difficult. This does sound like a very clean amp and worthwhile project. The Heffa amps are designed to be economical to build and run in pure class A see the writeupand very clean sounding, but low power only 10 watts or so per channel for push-pull 's. OK, after all this time I did some research and find that there are a few good designs, aside the old Williamsons. Please upload images instead of linking to them to prevent this. Find More Posts by frank An externally hosted image should be here but it no longer works. Hopefully just using 1 power transformer except perhaps an extra to cover an extra un-provided-for filament voltage I notice on angela.

So basically any advice on finding reliable hopefully free schematics on similar projects or even just more construction info if this one starbound steam key do nicely for this tube, and transformer advice, etc. The second link electra-print com looks like it runs in ultralinear but only puts out My big question with this circuit is why he is providing DC to the filament rather than AC, has it something to do with the preventing parasitic oscillations as the chokes take of in the old project? I'm seeking advice on a higher-end setup to take more advantage of the tubes and would appreciate learning what secondary voltage center tapped would be best and how many milliamps it would need to be rated. One the second page it does show a power supply schematic with an adjustable bias control, but doesn't really give the specs on the transformer or voltage. It says it can do watts with enough voltage, and only has 3 other smaller octal tubes and shows 2 transformers for the entire unit not including the power supply, I believe. I found this in in old Amateur Radio handbook images are large but I wanted to get the detailI hope some of you can appreciate this schematic and writeup. I'm not an engineer, but was into a bit of ham stuff and one point, and basically know a few musicians that could appreciate a homebrew higher-end rig.

807 tube audio amplifier schematic