Alternative parts for Paragon, Parentheses & Nobleman

Grubb

Grubb

Well-known member
Hi folks, I'm having trouble finding some parts, not interested in paying for mojo either, happy to go with Tayda or cheap alternatives from elsewhere. Any suggested alternatives for the following? I've tried to nut this out using the search function but would appreciate some advice.

Paragon:
1S1588
MA856

Parentheses:
LM308 - is a TL072 ok here?
PF5102 - 2N5458s ok?
1N5817s ok as Ge alternatives?

Nobleman:
JRC4558D - LM833 ok?
2N5457 - I can get these at Mouser for $2 a pop, is that my best option?
 
Parentheses
1) No, use an OP07 but try and find a 308 as they sound the best.
2) I use 5458s in all of my Rat builds so yes
3) Absolutely, but make sure you match them for forward voltage to achieve the strongest octave effect
 
Also for the Parentheses:
Is a BC327 an ok substitute for a 2N5089?
BF244A for the 2N5457?
 
You can get JRC4558s from GuitarPCB. https://guitarpcb.com/product/1-jrc4558d-ic-chip-guaranteed-genuine/

You can also get LM308s and their replacement OP07s from the same site.
guitarpcb.com

IC LM308N - Original Rat Chip for our best RATT Deluxe PCB - GuitarPCB

LM308N - Original Rat Chip for our best RATT Deluxe PCB
guitarpcb.com guitarpcb.com
guitarpcb.com

IC OP07 Excellent choice for DOOM PROPHET - GuitarPCB

IC OP07 Chip is perfect for Doom Prophet as well as for any Rat guitar pedal circuit.
guitarpcb.com guitarpcb.com

And finally, 2N5457s for .25¢ less than you saw. https://guitarpcb.com/product/2n5457-jfet/
 
I can't be bothered chasing down 308s so I have built Rats etc with CA3130s. They sound great. I'm not enough of an aficionado to know the difference.
 
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