Underminer Sub Octave MPSA13/18?

[Kroars]

Looks like a great circuit! I’m wondering, could I replace the MPSA14 with a 13 or 18? Would it make much of a different in this particular effect?

Thank you!

 

[Nostradoomus]

MPSA14 and 13 are just about the same thing. Their data sheet is one in the same, but with MPSA14 being minimum 10000hfe and 13 being minimum 5000...you should be fine.

https://www.onsemi.com/pub/Collateral/MPSA13-D.PDF

 

[Kroars]

Awesome, thanks! Gonna order a handful of mpsa14 from Mouser. When I get them in I’ll compare and report back.

 

[knucklehead]

Awesome, thanks! Gonna order a handful of mpsa14 from Mouser. When I get them in I’ll compare and report back.

Ever get around to the comparisons? Considering this against a Parenthesis Mini I am in the midst of . . . .

 

[Kroars]

Ever get around to the comparisons? Considering this against a Parenthesis Mini I am in the midst of . . . .

I did. Sorry for not reporting back. I didn’t hear much of a difference between the 13 & 14, but ended up using the 14 (once they came in) just to follow build docs.

I will say that the Underminer is an awesome effect, really fun to play around with. I think I’d get more use out of the Parenthesis if I had to chose between the two. I’d highly suggest building both, whichever you’d like first.

 

[knucklehead]

I did. Sorry for not reporting back. I didn’t hear much of a difference between the 13 & 14, but ended up using the 14 (once they came in) just to follow build docs.

I will say that the Underminer is an awesome effect, really fun to play around with. I think I’d get more use out of the Parenthesis if I had to chose between the two. I’d highly suggest building both, whichever you’d like first.

Thanks for your take!

I am mid-Parenthesis right now - and I am using it in conjunction with the new Boss OC5 that generates polyphonic sub octaves. If I feel like the two don't mesh well the Underminer seems like the next logical step.

I see merit in theory to a combined Underminer/Parenthesis - how much control does the underminer give you on the amount of fuzz/dirt/hair applied to affected signal?

 

[Kroars]

Thanks for your take!

I am mid-Parenthesis right now - and I am using it in conjunction with the new Boss OC5 that generates polyphonic sub octaves. If I feel like the two don't mesh well the Underminer seems like the next logical step.

I see merit in theory to a combined Underminer/Parenthesis - how much control does the underminer give you on the amount of fuzz/dirt/hair applied to affected signal?

I’m not sure I’d call it fuzz/dirt from Underminer. It’s more for the times you want your guitar to sound like NES Castlevania or Mario Bros

Blend is definitely i noticeable/helpful knob as well are the two toggle switches.

 

[Betty Wont]

The Fuzz doesn't have a gain control, it can only be blended into the synth or dialed out completely.

 

[knucklehead]

The Fuzz doesn't have a gain control, it can only be blended into the synth or dialed out completely.

That can work . . . . TY!