[quote author="tardishead"]nice one Analag - good on you. looks a very interesting design. And so cheap for us DIY freaks.
Is this exactly the one that you have built. I did not see a third transformer for the sidechain in your DIY box photos. Have you changed it. All I see in your photos is an input and output transformer for each side. Also I thought you said the input and output transformer were all 600:10k not 10k:10k as shown in the schematic.
Is the "attack" pot both attack and release? What happens if you need something with slow attack fast release etc?
So I see a threshold control but what about RATIO?
Its kinda confusing because when I read back over your threads there would seem to be many revisions of the schematic.
can I just verify that this is the correct schematic and all the values are correct.
once again thanks very much[/quote]
This is another idea, I haven't reposted the schemo for the RS-660 (I gave it a name) On the 660 I only have one attack/release control, in fast attack/release setting the sound is very transparent but compressed, in slow attack/release setting the compression is heard more... especially in the drums ans bass, it tighten them up and gives a finished sound. When I run a full mix through it I can see why mastering engineers like this sort of thing.
One more thing...the RS-660 was built exclusively like I have it in the simulator....exactly no changes were made except for putting in a 10 ohm resistor in series with the B+ line to the Mu stage and connecting the VU meter around it. I have (2) trimmers one for the sidechain bias and one for the Mu stage cathode bias, it is critical to adjust these correctly. I also padded the output so that I can crank up the input and run the sidechain amp really hard. With the sidechain amp farting out it sends a cool control voltage to the Mu stage.
Another thing... the signal goes through (1) XSM600/10K (1) differential pair 6BZ8 (1) XSM10K/600... in that order. No caps...tubes and transformer, nothing else... the verdict. WOW.
analag