03-12-2016, 02:37 PM
Re power tests, point taken.
The readings of Q3 could be wrong as I may have got mixed up what with different Q's having different pinout's.
I've been trying to draw a schematic of the area around Q4/5 today inc Q3 where . It's a bit different to the schematic and as you say there are a few changes. For a start Q4/5 are BC547/557B's not MPSA43/93's and there's an extra cap in there too. There are some extra components "bodged" on the underside as well. Sorry I can't be more specific as my head is swimming from trying to trace where everything goes. My confusion isn't helped as there are no dark "fullstops" that you get on some schematics to tell you where two crossing lines are joined electrically.
As far as I can establish the pots are ok and the resistance disparity is caused by something else. I'll give some better info tomorrow when I've rechecked pinouts etc.
Andy.
The readings of Q3 could be wrong as I may have got mixed up what with different Q's having different pinout's.
I've been trying to draw a schematic of the area around Q4/5 today inc Q3 where . It's a bit different to the schematic and as you say there are a few changes. For a start Q4/5 are BC547/557B's not MPSA43/93's and there's an extra cap in there too. There are some extra components "bodged" on the underside as well. Sorry I can't be more specific as my head is swimming from trying to trace where everything goes. My confusion isn't helped as there are no dark "fullstops" that you get on some schematics to tell you where two crossing lines are joined electrically.
As far as I can establish the pots are ok and the resistance disparity is caused by something else. I'll give some better info tomorrow when I've rechecked pinouts etc.
Andy.
