Okay as I was staying over at my parents this week I though as it was 20 years ago this month I bought the old A400 it was time to give it a clean.
I also had it GTE'd and it was one of the first A400's done.
So out into the utility room we go and get to work.
There is 20 years of dust -
Scratchy pots and switches apparently so I got to work with my camera lens blower and a can of switch cleaner.
So we got to this -
Pots were a lot smoother but couldn't find any evidence of GTE tinkering. So we opened up the bottom. We found these wires -
Ahhh where do they go -
And there it is! A small board with a op-amp on it. Judging buy the soldering points its bypassing this -
The chip on the GTE mod was rubbed (as I kind of expected) but it did still have the numbers ***241 visible. So I reckon its maybe a OPA241/OPA2241 (?) op-amp. These cost today around £2.40 each. The op-amp on the main board is a C4570C which cost around 25p!
So there we go. That's the GTE mod exposed. We put it all back together -
It sounded fine. No scratching or problems. Back to normal and probably good for another 10 years.
Sorry about the pics. Phone was all I had.
I also had it GTE'd and it was one of the first A400's done.
So out into the utility room we go and get to work.
There is 20 years of dust -
Scratchy pots and switches apparently so I got to work with my camera lens blower and a can of switch cleaner.
So we got to this -
Pots were a lot smoother but couldn't find any evidence of GTE tinkering. So we opened up the bottom. We found these wires -
Ahhh where do they go -
And there it is! A small board with a op-amp on it. Judging buy the soldering points its bypassing this -
The chip on the GTE mod was rubbed (as I kind of expected) but it did still have the numbers ***241 visible. So I reckon its maybe a OPA241/OPA2241 (?) op-amp. These cost today around £2.40 each. The op-amp on the main board is a C4570C which cost around 25p!
So there we go. That's the GTE mod exposed. We put it all back together -
It sounded fine. No scratching or problems. Back to normal and probably good for another 10 years.
Sorry about the pics. Phone was all I had.