Comp Again

Now that we proved that the real thing correlates very well to my simulations. I have another vari mu beast that can behave like an Fairchild 660 and an Altec 436 and it's a combination of the two circuits with a twist.
Should I post?

analag

Post it, man. You know you want to!

A P

http://www.groupdiy.com/index.php?topic=15502
http://www.groupdiy.com/index.php?topic=15981
http://www.groupdiy.com/index.php?topic=15076
http://www.groupdiy.com/index.php?topic=15537

Are you saying that you think a new thread is needed?

Can it core a apple?

Post and let the agitation begin.... :green:

No, seriously post it.

[quote author="Larrchild"]http://www.groupdiy.com/index.php?topic=15502
http://www.groupdiy.com/index.php?topic=15981
http://www.groupdiy.com/index.php?topic=15076
http://www.groupdiy.com/index.php?topic=15537

Are you saying that you think a new thread is needed?[/quote]

What are you...the forum police When I plan to give the people what they want, they should be made to know that it's coming. How's that take on it, Mr Larr me friend.

analag

no, not the forum police, lol just a guy tryna follow 5 damn threads!

Took a week off the old jobby, I got too much time. Know what I'm doing now. Listening to the Poor Man, got it tweaked up nice. Meter needle is pinned to -20 on the VU scale. Sending some Ghetto fabulous hiphop through my baby. Wish I could rap, I could sing though.

analag

[quote author="NewYorkDave"]Can it core a apple?[/quote]

I dunno, maybe bust an egg?

I'll say it again... Tease.

Here we go...I might yank it at some point.

analag

I might yank it at some point.

Click to expand...

:green:

Care to explain your thinking on the time constants?
Is there some dual release going on?

Im thinking about the 0,1uf/221k stacked on top of the negative bias filter.

When the attack control is set to fast, the 0.1uF /221k takes over and allows the comp to be very fast yet shape the signal for less distorted compression at the onset of gain reduction.

I wish i had something useful to add, but I don't. So I'll say this, thanks for sharing....now if I could just find the time to take on yet another project, haha.

Man, with all the bitching and moaning that goes on against Analag, it's easy to forget that he's probably posted more circuits for discussion on this motherfucker than any other member...

Right on, Ro! :thumb:

Peace,
Al.

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

Thanks for the schemo, Rowan. I have no idea if I'll end up building it since I already have a killer vari-mu, but we'll see. First I'll finish my mods to an old Aphex Compellor (it'll be a killer!) and build the opto.. then we'll see how the compilation of compressors work.

[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

This schemo, even though it has (1) attack/release control, it has more signal shaping power than is immediately apparent. Once again you can crank up the input control (rotory switch) drive the 6SN7 hard then crank down the output control. This is geared more towards tracking applications
where you might want from transparent to something totally different coming out of it from what went in. Sometimes we need that in a compressor, don't we.

analag

does that mean that the poor mans 670 will never again be posted?