These are nearly the same amp. The main differences are on the vibrato oscillator circuit.

However, the 5E11 schematic (link below), shows 3/4-amp mains fuse, and the 5F11 schematic, shows 2-amp mains fuse.

A rough calculation, gives the total power required on the PT secondary, to be 55W.

Assuming PT efficiency of 95%, and applying the standard and temperature derate coefficients, gets a required PT primary power of approx. 84W.

For 115VAC mains voltage (CA on 1955), the estimated primary current will be 84W / 115Vrms = 730mA.

So, the 5E11 3/4-amp fuse makes sense to me. But why 2-amp fuse rate for the 5F11?

Schematics here:

https://www.schematicheaven.net/fend...5e11_schem.pdf

https://www.schematicheaven.net/fend...5f11_schem.pdf

BTW, the Fender Harvard 5F10 schematic, also shows 3/4-amp mains fuse.

Any insights/ comments?

Thanks.

However, the 5E11 schematic (link below), shows 3/4-amp mains fuse, and the 5F11 schematic, shows 2-amp mains fuse.

A rough calculation, gives the total power required on the PT secondary, to be 55W.

Assuming PT efficiency of 95%, and applying the standard and temperature derate coefficients, gets a required PT primary power of approx. 84W.

For 115VAC mains voltage (CA on 1955), the estimated primary current will be 84W / 115Vrms = 730mA.

So, the 5E11 3/4-amp fuse makes sense to me. But why 2-amp fuse rate for the 5F11?

Schematics here:

https://www.schematicheaven.net/fend...5e11_schem.pdf

https://www.schematicheaven.net/fend...5f11_schem.pdf

BTW, the Fender Harvard 5F10 schematic, also shows 3/4-amp mains fuse.

Any insights/ comments?

Thanks.

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