On Thu, 18 Oct 2007 11:43:25 -0400, Meat Plow
wrote:

On Thu, 18 Oct 2007 09:23:08 +0000, Arfa Daily wrote:

I'm sure that there are others on here who have also been mending PA amps
for many years, who would agree with most if not all of what I've said, so I
hope you will take it as valid observations and advice.

Agree 100%. For a period of time I quit servicing all other pro audio gear
except for PA gear. I had stacks of Soundcraftsman amps to the ceiling.
Worked on Peavey CS series almost as much. Did weekly repairs on Crown,
BGW so I am reasonably qualified to comment.
I think what's happened here is the quality of testing and measurement on
the OP's side isn't good enough to provide help. The OP needs to step up
to the plate. These amps aren't rocket science and some fundamental
troubleshooting steps much more often then not will reveal the problem(s)
provided you have the skill and experience to perform them. All these
dynamic tests the OP is doing will do little in the absence of a quality
static workover with just a simple DVM.


***********

Thank you Meat Plow for sharing your time and experience. I'm quite
willing to admit I am inexperienced and appreciate any and all advice
I can get. As you can see from today's posts I agree with you and Arfa
totally.

fundamental troubleshooting steps much more often then not will reveal the problem(s)
provided you have the skill and experience to perform them.

do little in the absence of a quality static workover with just a simple DVM.


That is the problem. I don't have those skills. I am learning them
now. Can you recommend some good books?

I am interested to learn more about how to do a static workover with
my DMM.

If this amp (plays, but fuzzy and somewhat distorted) came to you
would you listen to music through it or scope it or do a static to it
first?

I moved out here to the Oregon backwoods after working in construction
for 35 years in Southern California, so I am out of touch with many
resources as far as on-the-job training.

There seem to be a number of these old amps here that need a little
resurrecting. I enjoy this and may make some money and friends
pursuing my hobby. I can take these amps home and work on them at my
leisure, so it is a good deal for me.


If I may ask, where and how did you learn your trade? If you had
amplifier repair jobs stacked to the ceiling, I am guessing that you
worked in a major city.

What is OP? Output?

Dr. RaTsTaR