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

5150 FAQ

5150 vs 6505

• These amps are EXACTLY the same other than cosmetic differences. Eddie Van Halen owns the trademark for 5150. When he left Peavey in 2004, they had to change the name. All references I make to the 5150 apply to the 6505.

5150II vs 6505+

• Once again, these amps are EXACTLY the same other than cosmetic differences. All references I make to the 5150II apply to the 6505+.

5150 vs 5150II

The 5150II has the following differences:

1. Adjustable Bias - even with the adjustable bias, it will not let you adjust the bias to where it needs to be (36-42mA)
2. Seperate EQ, Resonance, and Presence controls on the Rhythm channel
3. "Crunch" is footswitchable on the Rhythm channel
4. An additional preamp tube on the Rhythm channel
5. The amp has less low end, less gain, brighter, and has a better clean tone.

5150 Block Letter vs Signature/Script Logo

• These amps are EXACTLY the same. Peavey had to change from the block logo to the signature/script logo because of a trademark dispute with another manufacturer.

5150 Tube Layout

• On the Rhythm and Lead channels the signal goes through v1, v2, v5, v3, v4, then the power tubes.

5150II Tube Layout

• The Rhythm channel goes through v1, v6, v3, v4, then the power tubes.
• The Lead channel goes through v1, v2, v5, v3, v4, then the power tubes.