I should probably be less mysterious about this. I'm dreaming up a way to mechanically mount an individual per-tube bias pot on the back of an amp that doesn't require hacking the chassis, just mounting a small (maybe 3" by 3" by 1") box on/under the chassis somewhere. It would let you attach this to an amp easily - if individual per-tube biasing is something you want.
The idea is to bring out test points for per-tube current measuring from the output tube cathodes and protected access for a screwdriver adjust, while spending some thought about how to make this safe for the amp - for instance, making an accidental probe short not be an amp-changing event.
This required me to know more than I currently do about the range of voltages and currents in a wider range of amps than I'm personally familiar with.
I've come up with some ideas about how to do this, and while we discuss it here, I've been drawing things. I like my red-light/green-light bias indicator, so I'm also thinking about making this an option if someone wants it. We got really positive reviews on that from everyone we heard from that tried it.
It's not particularly earth shaking. As the bard said, a small thing, but mine own.
The idea is to bring out test points for per-tube current measuring from the output tube cathodes and protected access for a screwdriver adjust, while spending some thought about how to make this safe for the amp - for instance, making an accidental probe short not be an amp-changing event.
This required me to know more than I currently do about the range of voltages and currents in a wider range of amps than I'm personally familiar with.
I've come up with some ideas about how to do this, and while we discuss it here, I've been drawing things. I like my red-light/green-light bias indicator, so I'm also thinking about making this an option if someone wants it. We got really positive reviews on that from everyone we heard from that tried it.
It's not particularly earth shaking. As the bard said, a small thing, but mine own.
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