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December 06, 2021, 12:29:54 AM

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Author Topic: Marshall Lead 12 combo (5005) - Help diagnosing weird drive 'fizzle'  (Read 1809 times)

Ubik_Fresh

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Re: Marshall Lead 12 combo (5005) - Help diagnosing weird drive 'fizzle'
« Reply #15 on: February 12, 2021, 11:08:46 AM »
Hey folks, tried a long list of different Op-amps today. I have to admit, they all had issues compared to the original op-amp. None of them really sounded 'good' to my ears, so there's a definite reason for the 1458 in the circuit.

For now, I am happy to stop tinkering. The fizzle, I think is just part of how the circuit behaves. I may upgrade the speaker to a greenback at some point. But, not in any rush per se.

DrGonz78

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Re: Marshall Lead 12 combo (5005) - Help diagnosing weird drive 'fizzle'
« Reply #16 on: February 12, 2021, 01:57:12 PM »
Those 1458's are very much the only opamp that will work with that amp. All who try to replace it with a different opamp run into trouble.
“A person who never made a mistake never tried anything new.” -Albert Einstein