Metropoulos Forum

Hi,
When I connect directly (and only) to the bright channel, I can hear the Normal knob affects the tone (minor changes).
What is wrong here:?

https://fbcdn-sphotos-h-a.akamaihd.net/ ... 7958_n.jpg" onclick="window.open(this.href);return false;

https://fbcdn-sphotos-b-a.akamaihd.net/ ... 0226_n.jpg" onclick="window.open(this.href);return false;

https://fbcdn-sphotos-f-a.akamaihd.net/ ... 2550_n.jpg" onclick="window.open(this.href);return false;

https://fbcdn-sphotos-a-a.akamaihd.net/ ... 8136_n.jpg" onclick="window.open(this.href);return false;

https://fbcdn-sphotos-g-a.akamaihd.net/ ... 7616_n.jpg" onclick="window.open(this.href);return false;

https://fbcdn-sphotos-d-a.akamaihd.net/ ... 4760_n.jpg" onclick="window.open(this.href);return false;

https://fbcdn-sphotos-f-a.akamaihd.net/ ... 8393_n.jpg" onclick="window.open(this.href);return false;

nothing. that's normal.

Really?
I understood that they shouldn't be affecting each other.

Look at your schematic. On a Marshall 4-holer there is a 470k mixer resistor just before V2a, each channel joins here so where you set your volume pot will affect the 'voltage divider' at that point, if you turn the unused pot right off then the 470k is grounded and you get no interaction. In fact the lead channel bypass cap will bleed off some highs from the normal channel if that is what you are plugged into (try it!).

I usually plug into Hi I and adjust my overall volume and then adjust the unused volume to where it sounds best, usually 7-8 on main volume and 3-4 on the unused channel II.

What makes ch 1 and ch 2 sound different even if you have .022 in ch 1 and ch 2?

Bright cap on the mixers, and the split cathode if that's employed. And bright cap on the volume pot, but that goes without saying.

so the mixer brite cap only works on ch 1? So no split cathode and no ch 1 brite cap...so then its the mixer resistor? If you had no mixer resistor,no split and no ch 1 cap both ch would be the same? Thanks Mark