Fordoble opamp question

[jimilee]

I just built up this thing, I love the demos. I used a Tl072, didn’t have any 2134s. Both sides were doing the same thing, so on a hunch, I dug out a pedal I knew had one in it. This fixed the issue. Is there any reason the 072 wouldn’t work, is it the biasing resistor? The 2134 is now a 6.00 chip, don’t know if this thing is 12.00 good.

 

[Barry]

Seems like I bought some subs for the 2134's a few weeks ago, if so, I'll throw a couple in the package with the transistors.

 

[jimilee]

Thank you, that’s very kind of you.

 

[bean]

The difference between precision, high fidelity op-amps and basic jFet/BJT input run of the mill amplifiers is bragging rights. Maybe I'm getting crusty but fidelity in guitar pedals might be a bit overated!

 

[Barry]

Thank you, that’s very kind of you.

I had already sealed the package, so I slit the top enough to drop them in and taped it closed. Will try to get to Post Office tomorrow.

 

[HamishR]

Weird. I've built these with TL072s, TLC272s and 2134s. They've all sounded fine. Mind you I do leave out the diodes.

 

[music6000]

I just built up this thing, I love the demos. I used a Tl072, didn’t have any 2134s. Both sides were doing the same thing, so on a hunch, I dug out a pedal I knew had one in it. This fixed the issue. Is there any reason the 072 wouldn’t work, is it the biasing resistor? The 2134 is now a 6.00 chip, don’t know if this thing is 12.00 good.

Are they legit TL072's?
If it has a Texas stamp & Indent on top, it's fake!

 

[jimilee]

Are they legit TL072's?
If it has a Texas stamp & Indent on top, it's fake!

They came from @Robert so my guess is, they’re real.

 

[Giorfida]

The difference between precision, high fidelity op-amps and basic jFet/BJT input run of the mill amplifiers is bragging rights. Maybe I'm getting crusty but fidelity in guitar pedals might be a bit overated!

And the irony of the “magical, mystical unicorn fart mojo” of the generic run of the mill JRC4558 in TS pedals!
Remember the days when pedal builders would scratch out the IC labels when folks actually believed all of the tone was in the IC choice?

 

[Chuck D. Bones]

Hard to believe anyone would fake TL072, the legit ones are so inexpensive. I have a counterfeit OPA2134 someone sent to me for testing. It's probably a relabeled TL0x2.