leigh
Well-known member
I just finished checking out an Altec 436C on the bench, and found the voltages to be about what they're spec'ed to be in the published schematic (biggest variation about 10% under).
My only complaint in its behavior. Bear with me here for a second:
In its compression action, it has a weird recovery/release lag. Say I've got an organ plugged into it and I play two sustained notes in a row with a short rest between. On the first note, the dB reduction meter swings to 10 and stays there. I release the note, and the meter starts to swing back to 0 dB reduction. No problem so far. However, on playing the second note (say, when the needle's made it to about 5 dB), the note starts very quiet (almost off), and gets LOUDER as the needle swings back up to 10dB reduction! That's not right... it sounds like the note's being played with a slow attack envelope. This seems to happen more with fast release times.
So... my current question is, would recapping the PS "stiffen" its voltages and fix this weird mushy recovery lag, or is this inherent to the circuit?
Full docs and schem here:
http://www.dvq.com/hifi/images/436c.pdf
Cheers,
Leigh
edit: or maybe just replacing C4, which is part of the sidechain rc?
My only complaint in its behavior. Bear with me here for a second:
In its compression action, it has a weird recovery/release lag. Say I've got an organ plugged into it and I play two sustained notes in a row with a short rest between. On the first note, the dB reduction meter swings to 10 and stays there. I release the note, and the meter starts to swing back to 0 dB reduction. No problem so far. However, on playing the second note (say, when the needle's made it to about 5 dB), the note starts very quiet (almost off), and gets LOUDER as the needle swings back up to 10dB reduction! That's not right... it sounds like the note's being played with a slow attack envelope. This seems to happen more with fast release times.
So... my current question is, would recapping the PS "stiffen" its voltages and fix this weird mushy recovery lag, or is this inherent to the circuit?
Full docs and schem here:
http://www.dvq.com/hifi/images/436c.pdf
Cheers,
Leigh
edit: or maybe just replacing C4, which is part of the sidechain rc?