Freddy G

LA2 gain mod
« on: January 25, 2006, 11:32:22 AM »
I've got to tame the excessive gain on my La2 clones....typically the first 15%-20% of the pot's travel is where all the action is. What do you guys think about replacing R12 (470k) with a lower value?
I'm thinking this would be a good way to lower the gain without changing the current going through the first half of the 12AX7.
Any thoughts?
Thanks,
Freddy :sam:
PRR wrote:
Use #18 wire for rock-n-roll, #16 wire for classical.


AnalogPackrat

LA2 gain mod
« Reply #1 on: January 25, 2006, 11:44:43 AM »
Freddy,

CJ has posted some mods which reduce gain by swapping out V1 for a 12AY7 and using 100k for r9 and r13.  You can search for it on the main la2a thread.  It's on my to do list, but I haven't gotten around to it yet :roll:

A P
If it is to be, it is up to me.

Freddy G

LA2 gain mod
« Reply #2 on: January 26, 2006, 09:02:03 AM »
AnalogPackrat,
Yes I know about CJ's mod. But, does anyone see any problems with what I'm proposing....playing with R12's value?
Cheers,
Freddy :sam:
PRR wrote:
Use #18 wire for rock-n-roll, #16 wire for classical.

CJ

LA2 gain mod
« Reply #3 on: January 26, 2006, 02:39:27 PM »
Don't do it, don't be a freak,
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

Freddy G

LA2 gain mod
« Reply #4 on: January 27, 2006, 07:47:30 AM »
haha.....OK CJ, I don't want to be a freak.....I'll go with your mod!
Cheers,
Freddy :sam:
PRR wrote:
Use #18 wire for rock-n-roll, #16 wire for classical.

Rob Flinn

LA2 gain mod
« Reply #5 on: January 27, 2006, 07:54:11 AM »
Many of the producers that I know think this "extra gain" is very useful & one of the qualities of the LA2a.
regards Rob

CJ

LA2 gain mod
« Reply #6 on: January 27, 2006, 01:45:10 PM »
remember, the first ones had a pad on the back.
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

rove

LA2 gain mod
« Reply #7 on: February 04, 2006, 10:37:11 PM »
What type of pad was on the first La-2 compressors?
thanks.

CJ

LA2 gain mod
« Reply #8 on: February 06, 2006, 01:49:39 PM »
i think it was a three resistor deal.
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

 

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