The Mods

Adjustable Bias Mod

• We add an adjustable bias to the 5150 and mod the 5150II so that the bias can be adjusted to properly get the amp out of crossover distortion.
• We can add bias test points to the 5150. We can correct the bias test points on the 5150II so that they can measure bias current instead of bias voltage.

How it Sounds: Before vs After

5150II Lead Channel to 5150 Specs

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How it Sounds: Before vs After

Mid Sweep

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How it Sounds: Before vs After

Choke

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How it Sounds: Before vs After

Output Transformer

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How it Sounds: Before vs After