matta
Well-known member
Well...
I got this A*RT P*RO V*LA from a friend to look at and try save it from the
Dumpster (Sound familiar Pucho?), opened it up and it looked like a WAR
ZONE.
I have counted no less than 18 blown caps leaking goo all over the PCB,
every cap in the PSU section and the caps near the Tube heater...
I?m not even going to try and fix this as even if I recap who knows what
damaged happened in the rest of the circuit.
What I am wanting to do is salvage the push button switches, pots, VU?s and
use the case for another project, waste not, want not as my Mom used to say.
My only concern is although the VU meter says VU on the scale (so must be a
true VU right, LOL) it might actually not be. Looking at the schematic could
you give me your views on whether or not you think it is a TRUE VU of a DC
?mimicking? a VU.
Here you go:
Looking at it I don?t think it is because it uses a dual opamp and I can?t
help but think half of it is used to mimic a ?AC Rectifier? creating a Pseudo
VU meter, but I am a complete Newbie, so could have it COMPLETELY wrong.
The Meter itself has no markings what so ever. I?ve attached it to my G1176
and in GR mode the Meter pegs to the right (+3) with no audio in at all, and
trimming makes no difference on the meter though the G1176 unit seems to work
fine, voltages are correct, no hums, passes audio, and compresses fine,
which makes me think the meter is not a TRUE VU or something else is wrong..
I saw Jakob post this:
Before I desolder and try, can you guess
Thanks in advance
Matt
I got this A*RT P*RO V*LA from a friend to look at and try save it from the
Dumpster (Sound familiar Pucho?), opened it up and it looked like a WAR
ZONE.
I have counted no less than 18 blown caps leaking goo all over the PCB,
every cap in the PSU section and the caps near the Tube heater...
I?m not even going to try and fix this as even if I recap who knows what
damaged happened in the rest of the circuit.
What I am wanting to do is salvage the push button switches, pots, VU?s and
use the case for another project, waste not, want not as my Mom used to say.
My only concern is although the VU meter says VU on the scale (so must be a
true VU right, LOL) it might actually not be. Looking at the schematic could
you give me your views on whether or not you think it is a TRUE VU of a DC
?mimicking? a VU.
Here you go:
Looking at it I don?t think it is because it uses a dual opamp and I can?t
help but think half of it is used to mimic a ?AC Rectifier? creating a Pseudo
VU meter, but I am a complete Newbie, so could have it COMPLETELY wrong.
The Meter itself has no markings what so ever. I?ve attached it to my G1176
and in GR mode the Meter pegs to the right (+3) with no audio in at all, and
trimming makes no difference on the meter though the G1176 unit seems to work
fine, voltages are correct, no hums, passes audio, and compresses fine,
which makes me think the meter is not a TRUE VU or something else is wrong..
I saw Jakob post this:
..feed it 775mVAC through a 3.6K resistor, and see if the needle sets around
-4dB. If so, it's right. If not, check with recorder schematics to try to
find out meter sensitivity and if they have the needed internal rectifiers..
Jakob E.
Before I desolder and try, can you guess
Thanks in advance
Matt