Tweaking Back!

Dax-The-Ax · Post by **Dax-The-Ax** » Thu Mar 10, 2005 7:41 pm

My 50 Watt Lead was starting to sound a little mushy, i guess everything is breaking in. I had a 100K feedback resistor on the 8 Ohm Tap and Next to the bias pot i had 2 10K's. Went back to 1 10K and the 47K feedback resistor and the crunch is back!!! These animals are very strange, sound great one day and then they change, or maybe it's my ears changing! What do you all think of changing the .0022 to a .022? Do most prefer the bassier setup with the .022?

Dax

Billy · Post by **Billy** » Thu Mar 10, 2005 8:54 pm

I do. I know Im not exactly a Super Lead kinda guy but I think the 2n2 is a bit too thin in a subtle way.

Flames1950 · Post by **Flames1950** » Thu Mar 10, 2005 9:04 pm

Billy wrote:I do. I know Im not exactly a Super Lead kinda guy but I think the 2n2 is a bit too thin in a subtle way.

Exactly. When I redid my '78 PCB I put an .022uF on the bright channel. It sounded so much thicker than the bright channel on my '75 that I had to jumper an .022 SoZo over the .0022 Mustard. You won't know what you did without it if you try it.

jj jafar · Post by **jj jafar** » Thu Mar 10, 2005 9:31 pm

what does removing one of the 10ks do?jason

Flames1950 · Post by **Flames1950** » Thu Mar 10, 2005 11:32 pm

jj jafar wrote:what does removing one of the 10ks do?jason

It allows the preamp to get a little more voltage. It seems to be more of a fifty-watt issue as the power transformers of the seventies put out less voltage. I don't think it's a necessity with the 100's -- I've never seen them with only one instead of two anyway.

Dax · Post by **Dax** » Fri Mar 11, 2005 12:30 am

With only one 10K, the amp is a little less gainy. It has a little more crunch. More distortion with two.

Dax

Billy Batz · Post by **Billy Batz** » Fri Mar 11, 2005 10:25 am

You can think of it changing the stiffness of the preamp. Changing the plate resistors have a much greater influence over biasing the tube and getting more saturation but raising the voltage by removing a 10K will make it a bit cleaner and stiffer as opposed to a bit more.... compressed I guess is the only word I can think of. I wouldnt worry about it in a 100 watter.