George, I have a LOUD problem!

rjgtr · Post by **rjgtr** » Mon Jul 11, 2005 1:23 pm

This also one of those things you learn to recognize from experience.

white room · Post by **white room** » Mon Jul 11, 2005 1:40 pm

Billy Batz wrote:Problems like that are easy to find though because their so 'specific.' Not anything will just push the amp into positive feedback. And you aint shittin. That is one loud sound. Its probably on par with a tug boat horn. The only time Ive made that mistake is with my TWreck clone which was about 35 watts, not nearly as loud as a 100W Marshall would be. I have a parasitic in my newest 100W build thats just drivin me up the friggin wall. It took me so long to get the parts and build this thing and Im pissed.

A tug boat horn perfectly describes it

Up until that moment I had never dealt with an amp going into positive FB or being unstable like that so I really thought that I had screwed something up and that was what was pissing me off because I did not do anything different in the installation process that I didn't do when I installed the clone OT, other than have to drill the mounting holes and pass-through holes for the wires since this OT needed to be turned 90 degrees.

I was quite proud of myself because the job turned out beautiful and then when the "tug boat horn" sounded off, that really took the wind out of my sails ( no pun intended )

I'm just thankful that I had access to some knowledgeable people about it which fixed the problem quickly. This is the best BB for straight tech talk.

It's cool in one way because now I know the sound of positive FB and what the probable cause can be. I can't believe how much I have learned about my amp in the short amount of time I have been hanging out on this board. Great stuff. Great people.

Dan,

You bring up another subject that get's quite a bit of attention, that being parasitic osillation. I don't know that I have ever heard what that sounds like so if I where to run across that I may not know what it is. I have an idea but that's all it is. In any case, I hope you find the source of the problem with your amp.

Chad

NY Chief · Post by **NY Chief** » Mon Jul 11, 2005 3:26 pm

white room wrote:[ I can't believe how much I have learned about my amp in the short amount of time I have been hanging out on this board. Great stuff. Great people.

Second that, whiteroom!