You can use BL3208 in place of MN3005 (if you use 2x for every one MN3005). You do not need to use reverse polarity to power it, but you need to set the BBD jumpers on the board to match the v3205 instead of the MN3005. This flips the power and ground between pins 1 and 5. The Dirtbag runs on negative ground no matter what BBD you are using...the needed change is in the jumpers.
Sonically, I much prefer the BL3208 to the v3205 and you will get closer to an MN3005 with them IMO. They do have better headroom and also the decay sounds better to me. However, the max voltage you can use is 10v on the BL3208. So, you might consider using a charge pump on a 9v supply then regulating it down with a 10v regulator (yes they do exist). Also, you will need to adjust the two resistor values on the compander so that the output voltage on pin 7 of your NE571 is about 5v.
A side note: you know that hugely expensive Toneczar delay? It's 8xBL3208 running on 10v (the rest of the audio path is 15v). FYI.
Sonically, I much prefer the BL3208 to the v3205 and you will get closer to an MN3005 with them IMO. They do have better headroom and also the decay sounds better to me. However, the max voltage you can use is 10v on the BL3208. So, you might consider using a charge pump on a 9v supply then regulating it down with a 10v regulator (yes they do exist). Also, you will need to adjust the two resistor values on the compander so that the output voltage on pin 7 of your NE571 is about 5v.
A side note: you know that hugely expensive Toneczar delay? It's 8xBL3208 running on 10v (the rest of the audio path is 15v). FYI.


