T-amp, too loud, too soon

[Mr.Mekulic]

Hi all

I have been using T-amp for some time and I am very happy with it. But after doing the input mod (2uF paper in oil) my amp gets too loud too soon. I’m using the stock pot (50K). There no more smooth increase in loudness. My amp gets from silent (7 o’clock) to pretty loud (9 o’clock) and then slowly increases volume in the remaining travel. I’ve tried 2 stock T-amp pots and it’s the same thing. How do I fix this? Other value of pot (20k,100k) ? Or put a resistor somewhere? I removed R01 and R02 in stealth mod, so maybe that’s the problem?

[luka]

Well I would change back the cap and see if that is the couse of your problem.

[Mr.Mekulic]

Originally posted by luka
Well I would change back the cap and see if that is the couse of your problem.

But then I would lose the bass benefits of the mod! Hundreds of people have done this mod and I have never seen reports of this behavior. I will try it if nothing else helps, thanks.

[kubeek]

I guess you didn´t catch the concept. You change it back to see if the loudness effect remains or not. Only then you can see if it is caused by the new cap or something else...

[cpemma]

You've done the stealth mod, check your board breaks and wiring very carefully against the graphics in the 'Input Mods' page here.

I've done this using an ordinary dual 47k log pot no problems with volume slope.

[Pano]

Sounds like a wiring problem at the pot.

Can you post a diagram of how you have wired it?
Don't post what you think you did, post what you really did. Trace your wiring.

[Mr.Mekulic]

Originally posted by panomaniac
Sounds like a wiring problem at the pot.

Can you post a diagram of how you have wired it?
Don't post what you think you did, post what you really did. Trace your wiring.

Here is a diagram and a pic. Be gentle it's my first soldering job.

[Mr.Mekulic]

btw - How do I attach multiple files to 1 post ?

[deiksac]

What I can say from the picture and the schema - you have just added extra caps in series to existing caps placed on the sonic impact board - this cant bring you any bass benefit, you gotta replace those onboard stock caps - which is a pretty tedious work since they are ver very small and the copper traces below the get destroyed pretty easily

[Mr.Mekulic]

Originally posted by deiksac
What I can say from the picture and the schema - you have just added extra caps in series to existing caps placed on the sonic impact board - this cant bring you any bass benefit, you gotta replace those onboard stock caps - which is a pretty tedious work since they are ver very small and the copper traces below the get destroyed pretty easily

I removed R01 & R02 and removed and briged C3&4. The bass benifits are there, the mod is working fine, but the volume is the problem.