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OD pedal turned fizzy after rolling opamp
OD pedal turned fizzy after rolling opamp
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Old 15th April 2019, 06:36 PM   #1
JDinkelman is offline JDinkelman  Netherlands
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Default OD pedal turned fizzy after rolling opamp

Hi,

I recently received a Biyang OD8 pedal which is a Tube Screamer clone with some additional features. One of the additional features is the ability to exchange the opamp. It even comes with 2 additional ones to experiement with.

OD-8 | BIYANG

I played for many hours and was very pleased with it driving my diy amp. Having become familiar with the sound and possibilities, I decided it was time to exchange the opamp for one of the other two that were included.

The result was not very pleasing. There was a layer of fizz beneath the tones and soft and decaying notes end in a farty way. I went back to the original opamp but the problem remains...

Obviously, I checked the battery but it's still over 9V (the led is also still very bright). I also it with a different guitar and a different amp but no joy...

The opamp socket feels very sturdy and the opamp is seated well (and I reseated it a few times but no change).

Does anyone have a clue what could be the issue?
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Old 15th April 2019, 06:57 PM   #2
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Check the voltages on the pins to make sure they are correct.
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Old 15th April 2019, 07:12 PM   #3
JDinkelman is offline JDinkelman  Netherlands
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Quote:
Originally Posted by JonSnell Electronic View Post
Check the voltages on the pins to make sure they are correct.
Thanks for the suggestion and it sounds as the most sensible next step.

However, I just reseated the original opamp again (JRC 4558D) and was about to look for a data sheet but wanted to give it another try. It's now perfect again. Maybe something in there needed a half an hours rest...

I guess I will leave it in there as I love it as it is..
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Old 15th April 2019, 08:12 PM   #4
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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The JRC4558 is used by many quality manufacturers and there are no complaints. Some DIYers swap out the JRC with super fast chips and wonder why they get instability issues.
Rule of thumb is, if it was needed, the manufacturer would have fitted them.
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Old 15th April 2019, 11:53 PM   #5
JMFahey is offline JMFahey  Argentina
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Agree.
Manufacturers do not choose one or another based on cost, since a dual op amp is very cheap nowadays, so if they fit one type or another itīs because they like it better, and optimize circuit for it.
So a replacement may work ... or not.
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