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Notes About Parts/Substitutions

Vactrols aren’t sold by most large electronics distributors, but many small shops still sell them. 

Look around and you will find some! You can get singles on eBay, even. If you cannot find anything 

from a shop, post in the Muffwiggler DIY forum and I am sure someone will have one to sell you. I do 

not have any to sell so please do not ask!

You should change R87 to about 590R if you’re using 15V.

You can substitute different transistors for the BC549/559 without any perceived changes, but make 

sure the pinout matches by comparing the datasheets!

Every other part is pretty common and you should be able to find them at all retailers. I do not 

recommend substituting other component values. Because this design uses resistors, capacitors 

and transistors to create the hihat sounds from scratch, different component values will alter the 

sound. 

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