OP
Its Good To Have A Backup:
- Thread starter Inspector #20
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OP
@STU - The first song on that clip is an original that we just finished. Here's the completed song:
Dropbox - Error - Simplify your life
The second riff is another original song that we recorded yesterday.
Iron1
AmbassaDOOM of Red VVinter
I applaud your ability to stand strong in the face of the GAS Gods.
OP
Last night, I took some time and went into the 8200. Everything looks perfect. I changed the tube (I pulled a new JJ Gold Pin ECC83S and installed a TAD 7025-wa) with no changes in the noise.
Keep in mind I had done a complete compressed air/DeOxit service when I got the amp in December of 2021.
The amplifier plays fine and all functions work, but the "rushing wind" noise persists.
I tapped every component on the boards and the noise did not change, so it's more than just a bad connection or solder joint, at least I believe so.
For now, I bagged it and moved it into my closet.
To be continued...
Keep in mind I had done a complete compressed air/DeOxit service when I got the amp in December of 2021.
The amplifier plays fine and all functions work, but the "rushing wind" noise persists.
I tapped every component on the boards and the noise did not change, so it's more than just a bad connection or solder joint, at least I believe so.
For now, I bagged it and moved it into my closet.
To be continued...
Headache
Ambassador of all that is Heavy
It seems to me that when you plug a cable into it, that the amp makes the cable into an antenna for picking up every kind of interference around
Which would lead me to suspect an input jack grounding issue. (Very common type of problem with input jacks)
If it were mine, I'd pull the jack and reflow the solder.
Not that I'm any kind of amp tech, but that makes sense in my old brain.
Which would lead me to suspect an input jack grounding issue. (Very common type of problem with input jacks)
If it were mine, I'd pull the jack and reflow the solder.
Not that I'm any kind of amp tech, but that makes sense in my old brain.
OP
I agree...
I don't have the time/workbench space at present.
It's cool...it can wait. I got a 100 watt Marshall solid state backup.
We got a custom, hand-wired 50 watt master volume being built with all USA parts, a Metro FX loop and a resonance control.
OP
Got a response from a guy on the Marshall 8200 forum with the same problem.
He sent this video and said: "I’ve repaired a few of these in the past. It’s an easy fix if you can use a soldering iron. The TL702 chips are pennies to buy...."
Can we find this device in these photos???
He sent this video and said: "I’ve repaired a few of these in the past. It’s an easy fix if you can use a soldering iron. The TL702 chips are pennies to buy...."
Can we find this device in these photos???
They are 8 pin DIP chips. They should have TL072 on them. Easy to remove if you have a solder sucker.
OP
I'd rather pay you to do it. I ruin more than I fix!!!!!
OP
How does one isolate the bad one?
O-scope and a function generator along with the schematic. I have all 3.
OP
You are like the genius professor.
OP
Nah, but I did escape from Gilligan’s island once. :dood:
Possible ESD damage.
OP
I'm just wondering how???
OP
Compressed air cleaning???
OP
I'm not well versed in this!