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RE: Schematic?

First? I honestly don't understand a fraction of what you wrote. I do understand elementary stuff like voltage drop across resistors.

Yes, if you read the documentation of the tubes4hifi website, they DO talk about 'long tailed pair'....

Several thousand in Kit Form have been sold. I don't know if that's the ST70 or the ST120 or combined.

I went to tube depot. The number of the REVILED 12AU7 is about 4x or 5x the the 12BH7 which tells me something.....not sure what.....Several others, like the 5965 or 5814 or 6189 are also listed in small numbers. Just gotta look harder than I'm willing to do.

I thought modern voltmeters were VERY high input impedance and did away with most of those loading effects? My Simpson Senior Voltohmist was a VOM, but that was 30 years ago...or more. I have a WESTON Selective Analyzer up on the shelf as an 'object'......It's a model# 5xx / type 3, if that means anything to anyone.....

To safeguard their intellectual property, you do NOT get the schemaitc without the REST of the kit. Or drawings of point-2-point or the complete parts list, for that matter. But you CAN get a 'sample' upon request. Which I have done. Also? A YouTube video of the first part of the assembly including the 'stuffing' of the driver board including the Current Regulators....a SS device.....

One day you'll have to let me explain semiconductor processing to you. Easilly as arcane as tube design / execution to the uninitiated. Just dressing UP to go into the fabrication area is a treat. Head-2-toe coverall with mask, safety glasses and neoprene or latex gloves........along with shoe coverings. NO PENCILS allowed. A class 10 room is the cleanest place anyone is ever likely to be. Dust NOT sterile......
The places Ive seen where they assemble spacecraft are NOWHERE near that good........
Too much is never enough

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