voltage measurement problems after output upgrade BeePre 2

[Paul Birkeland]

Is the channel dropping or not getting louder?

A channel dropping means you lose the signal completely.

[denteom]

Yes I lose the signal completely on the left channel. But I regain it by pressing on the knob, at times tapping or wiggling it helps.  Also it really sounds a bit softer on the left.  If I switch it to -1.5 db and lower db knobs it is balanced.

[Paul Birkeland]

This means that the 0dB position is in close contact with metal on the switch body and needs to be spaced out.  This does not mean that the switch is not making contact on the 0dB fine position.

[denteom]

Do I need to try to bend with pliers, sandpaper it to have better contact or add solder?

[Paul Birkeland]

Maybe you could post some photos of that switch in your build.

[denteom]

hope these photos help.

[Paul Birkeland]

With the fine switch not on -0dB, can you check the DC resistance between the chassis and each empty lug on the fine switch?

[denteom]

Where will I put the Black lead? Is the black lead the chassis? Or do I clip the black lead to the chassis?
Does that mean checking the lug without the a resistor attached to it?

[Paul Birkeland]

One probe on one lug of the fine switch not connected to anything, one probe to the chassis with your meter set on DC resistance.

[denteom]

Switched at -4.5 db fine knob
At -1.5 db 85 k Ohm
At -3.0 db 36 k Ohm
(not sure of the decimal point. get confused by the analog meter)

[Paul Birkeland]

I'm talking about the DC resistance between each of these two terminals and ground.  Your readings don't make a whole ton of sense. In a properly functional BeePre, these should be OL, in your BeePre one may be close to 0.

[denteom]

Sorry about that, didn't get instructions right. When I measured again I got the same reading on both the empty lugs, it showed infinity result.
There were time when I got 0 ohm, but upon checking the lead was touching the nut beside it, so I think that was an error on my part.

[Paul Birkeland]

You want to be sure that the nuts that hold the switch together aren't allowed to touch the metal on that switch position.  That is about the only mechanism for losing a channel only on that switch setting.

[denteom]

Ok so you mean, I should tighten it and try again?

[Paul Birkeland]

No, I mean you need to physically inspect the switch to be sure the nuts and hardware on the switch itself are not contacting the empty lugs I point to with the arrows.

If those lugs touch the metal switch hardware, that will short a channel to ground when the switch is on the -0dB setting.  That is how you lose a channel with the way the fine switch is wired.

Again this is undesired metal-to-metal contact on the switch itself that needs to be addressed.