I have made a huge school boy error… i was looking at running my original Electric Mistress pedal for a recording I’m doing and needed to run it off an external power supply. I had a 18v supply to hand which I just needed to connect up to a DC plug so that I could power the pedal. In my haste, I accidentally connected the negative and voltage wires the wrong way round…… connected the pedal, switched on the power and I immediately heard a small pop and the smell of burning. I have blown an original 1977 V2 Electric Mistress. However, i’m sure it’s not dead yet, and it can be brought back to life… Hence this post.

On investigation I found that the BC309 (actually a 212L in my unit) was blown in half.

I’ve replaced the blown transistor, and plugged it all in and tested. When I switch the effect on I get the usual volume drop as you normally get with these pedals but no effect at all….. I have signal through the circuit though obviously so I’m now concerned that the SAD1024 might be dead.

So far I have replaced:

IC LM741
C9 – 100uf
C10 – 10uf
C11 – 10uf
c12 – 33uf
BC309 (this was replaced with a BC212L as per the original transistor in my unit)

Here are the voltages from my unit also:

SAD1024 socket (Chip removed)

1 – 0
2 – 3.38
3 – 4.27
4 – 0
5 – 8.57
6 – 0
7 – 8.54
8 – 4.26
9 – 8.56
10 – 4.27
11 – 8.56
12 – 0
13 – 0
14 – 4.23
15 – 3.38
16 – 0

SAD1024 (Chip in socket)

as above except

6 – 2.85
12 – 2.77

IC1 4558

1 -2.93
2 – 3.01
3 – 2.70
4 – 0
5 – 2.73
6 – 3.08
7 – 3.08
8 – 7.86

IC5 LM741

1 – 0
2 – 11.35
3 – 3.85
4 – 0
5 – 0
6 – 3.29
7 – 2.40
8 – 0

IC4 LM339

1 – 5.82
2 – cycles from ~0.60 – 7.51
3 – 8.21
4 – 4.22
5 – 4.19
6 – 1.26
7 – 0
8 – 0.05
9 – 4.95
10 – cycles from ~0.55 – 7.55
11 – 0.27
12 – 0
13 – 0
14 – cycles from ~0.20 – 1.30