Passive Pre-Amp causes huge power loss?

[Dominick22]

I built a passive preamp for my old tube amp using only the proper connectors and a pot. The problem is that I lose over half of the volume even when fully torqued?

I did connect all of the grounds together at the pot ground...Is this wrong? The grounding was my only confusion...but it plays?

Thanks,
Dominick

 

[Enzo]

What value is the pot? Is it wired right to a grid?

I doubt the grounding is an issue, you are loading the signal down.

 

[Dominick22]

Grid?

It isnt wired to anything. I tried both a 100k pot and a 10k pot.
Same results.

Also, as I turn the pot, the volume goes up and then back down as I continue turning.

Dominick

 

[Burnedfingers]

Please include your schematic.

 

[Dominick22]

Here is a rough sketch!

Dominick

An externally hosted image should be here but it was not working when we last tested it.

 

[aerius]

Also, as I turn the pot, the volume goes up and then back down as I continue turning.

Dominick

That's odd...is it possible you got a balance pot by accident instead of an audio taper pot? If the volume starts going back down once you hit the halfway point on the pot's rotation, chances are you got a balance pot.

 

[Peter Daniel]

Your connection is not correct, the center pin should be out, not ground.

 

[Tuukka]

try this

 

[Dominick22]

Peter and Tuukka,


LOL,
Sometimes I overlook the smallest things and stump myself. Problem fixed. Thanks so much...Now I can tone it down for the neighbors!


Dominick

 

[Burnedfingers]

As stated above.. when looking at the back of any pot the ground is on the left, out the center, and input on the right.

That is when you face the tabs up.