GHR Audio

Found this the other day. Have you ever test-built this?

How does the Auto Attack interact with the variable attack setting?

I like that idea. Did something like that on analag's DAOC with LED in antiparallel to optocell . But ended up also adding meter slowed down with a cap to show an approximation of average.

What meter is good on this? 200mA? 1mA?

The Recom R12-150B is mighty in price. Is there a cheaper alternative you can recommend?

Or a power toroidal backwards also could work, no?

That makes sense.

I read the description of the U73b, document on groupdiy.

In that text they talk about 'solid release times' of 0.3 - 0.6 - 1.2 seconds. These are easy to derive by putting resistors or caps on a rotary.

But they also talk about 2.5 - 6 -1.2s as being ' influenced by their respective program ...

For stereo would need two main boards. Can they be powered from one PSU board?

R18 and R19 are attack and release, right?

Worth making them variable, despite feedward then possibly tending to sound weird at 'wrong' setting?

Would 6BA6 tubes work ? Read that they are not fully equivalent to 6K4P, something to do with internal resistance.

Testing // matching / calibrating tube gain

This should help find tubes for better matching.
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1st step is to trim SC CV so that it rests at (i.e. slightly above) required SC out junction, effectively calibrating the sidechain CVs. Then:


"If you need some (minor) unity gain calibration -- and ...