Zero-Loss Fx Loop install question Orange Overdrive 80

[Henda]

Hi, I have just installed the Zero-Loss Fx loop into my Orange Overdrive 80. But I have a problem.

When the loop is on the circuit the amp sounds bassyer.

I installed the loop after the FAC control and I removed the two parallel resistors of the Echo (the loop the amp had). I have also replaced the 33k resistor after the choke for another of 27,6k. I used a 47k Decoupling (Dropping) resistor as my B+ is 366V.

What can be done?

He the schematics of my amp: http://www.orangefieldguide.com/OFG_SCHEM/ODschem_A.gif" onclick="window.open(this.href);return false;

[Henda]

Here how I have installed it: http://i260.photobucket.com/albums/ii3/ ... m_A1-1.gif" onclick="window.open(this.href);return false;

[Henda]

Steve has answered me (really fast) and proposes this solution. I can't say if this fixes the problem or not until Monday or so. I am lacking the needed resistors, but as soon as I prove the solution I'll post it here.

"When the 100ks were removed or diverted in the circuit, the plate load of the preceding stage changed. That + the change/loss of of an RC filter formed by those 100ks, and caps preceding it, means a lot more bass is now passed on to the loop and PI than there was originally.

To solve this, work with what you already have done, and keep the loop seeing the proper signal level, easiest fix would be to take a look at the attached edited pic of yours. Basically just adding one 47K to ground, changing the 100K you left in the amp (right before the loop) to 47k as well. Could also parallel another 100K to the existing 100K to bring its total value down to 50K if you prefer."

Here the schematic: http://i260.photobucket.com/albums/ii3/ ... tweaks.gif" onclick="window.open(this.href);return false;