scott2000

Re: Altec 436A - Recovery time selection switch
« Reply #20 on: July 17, 2020, 08:25:50 AM »
Nice!

Thanks for sharing.... and the thread......


craigmorris74

Re: Altec 436A - Recovery time selection switch
« Reply #21 on: July 22, 2020, 04:32:19 PM »
Hey Dan,

I have a  436A in my studio that I use on bass quite often.

To confirm what you did with your mods, you changed  C4 to 2.2uF -would that be slower than stock?  And would .68uF value make it faster than stock?  I've always wanted the option for a faster release.

Thanks,
Craig

BluegrassDan

Re: Altec 436A - Recovery time selection switch
« Reply #22 on: July 22, 2020, 05:53:58 PM »
Yes. Increasing C4 to 2.2uf makes slower than stock, decreasing makes it faster than stock.

My unit wanted to thump more and more with faster speeds. Increasing the 33k resistor makes the attack slower and helped it out. I bet tweaking the balance would help with the thumping, but I didn’t do that.

jensenmann

Re: Altec 436A - Recovery time selection switch
« Reply #23 on: July 22, 2020, 06:10:17 PM »
To decrease thumping from fast timeconstants you could swap the sidechain input caps sitting in front of the rectifier tube to smaller values. That´d basically make a sidechain highpass filter.
Jens
Quote from: PRR
The tubes of course don't care what frequency they distort


 

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