Resistor values in Muffin Fuzz build.

[e_man_89]

The PCB for this should be in the mail today. I settled on building the Stomp '75 variant.

In reviewing the build docs, I find that I don't have any 12k's.

They are found at R4, R10, R15, & R21. Along the voltage supply.

I understand that a fuzz circuit can be flexible, but I don't want to get too far away from the model I've chosen.

Some of the other models are calling for 15k's in these locations. My question is; will the 3k increase in resistance at these locations move me away from the Stomp '75 "voice" significantly?

What if I went down a few k ?

Anybody know how much the Stomp '75 and the Mask Us versions differ?

 

[spi]

Muffs are confusing because of the number of variants. Probably a lot of the distinct ones came from happy accidents of using what was on stock.

Apparently, the Mask Us is based on a Ram's Head that had some "wrong" values, either from the start or drifting over time, they they should be similar, but maybe different. Hard to know really unless you can A-B them. Small twist of the knob might account for any difference. I doubt my ears would tell the difference, but others who are finicky would. (I've seen J Mascis in concert many times and never once wondered what year his Muff came from or what resistors he had in them ).

One way you can address this is socket the resistor values you don't have. In a future order you can get the "right" values and plug them in. Once you've decided which voice you like, solder them into the sockets for posterity.

 

[spi]

BTW, I am bad at taking my own advice. Even though I know a small change of component usually doesn't change much in most cases, I do get hung-up on ensuring I have the part the circuit calls for, so I feel for you. If I were worried about it I'd probably fire up an order to get the missing parts, because it would bother me knowing I didn't.

 

[e_man_89]

Thanks for your help spi, I appreciate it.
Ok, here's my other deal... I got the PCB today...
An empty PCB will keep me awake at night if I don't go ahead and put it together!

 

[e_man_89]

I got my Muffin Fuzz going yesterday, went with the Mask Us. Only one resistor value change needed. I put a 470k at R20 instead of the 430k that it calls for. There are a number of the models that use this value at this location. I know resistor values are contextual, but these fuzzes can be flexible.

There's a couple of pics on the build report forum.

Thanks again spi for your help.