Alright, I want my bass back!

Hi again kids. So, for the last two days I've been running my super clean but stock PAS 3X with my ST70. Without the preamp, my bass was loud and tight, just right. With the PAS, it's not as loud nor as tight.

What will get the bass back under control? Which upgrades/mods should I concentrate on. Will the regulated power supply help with it? Should I do that first or replace the boards first?

Thanks again for any help.

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Thanks Peter, I will , of course, try your tips first. You've been a big help up to this point, thanks.

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1uf film caps have been ordered.

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Actually, I tweaked the bass pots ever so slightly and the bass sounds right to me now. When i go in to change the caps, I will make sure the knobs are oriented correctly.

Thanks again Peter.

A couple of hints:

While most on this forum won't have the equipment to do so, I used to set up PAS preamp tone controls in the repair shop for flat response using a frequency sweep signal and an oscilloscope, and marked the front panel accordingly (on a piece of clear tape).  

Also, if you are running a tape recorder, computer audio input, remote headphone transmitter or most other solid state equipment off the TAPE OUTPUT of the PAS, you will probably experience bass rolloff on PHONO; the output of the phono stage sees whatever is plugged into the TAPE OUTPUT, and if the input impedance of the connected device is too low, the bass from the phono stage will roll off.

Earlier tonight I replaced the 1uf electrolytic caps on the tone controls with Panasonic film caps and got a nice tone improvement from the PAS. Thanks Peter Capo!

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Won't replacing the power supply caps with a VTA board get rid of the selenium stack entirely?

tygr1 wrote:Won't replacing the power supply caps with a VTA board get rid of the selenium stack entirely?

Yes it will. It has to since it's mounted at it's place.