Luthiery Laboratories

Doing Things Wrong

Silvertone 1457 Guitar & Amp (3/5)

The attenuator circuit for both the 1457 and 1472 amps

The LPad is the first stage and does most of the work, the fixed second stage can be switched in for even more quiet. The 50 watt LPad should be sufficient for at least a 20 watt amp. The capacitors suppress audible pops from the switches.

For the circuit above, the 1457 amp is nominally 5 watts at 4 ohms, while the 1472 is 10 watts at 8 ohms. The idea is to bleed off power while maintaining a constant impedance to the amp. This lets you get nice natural tube distortion without the neighbors calling the police. For these small amps, heat dissipation is not a problem.

Each circuit has two options for the fixed second stage, one for 12db and one for 20db - choose one. The values of the fixed resistors depend on the impedance of the speaker. For simplicity, just omit the second stage, it is not necessary, I was just experimenting.

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Jigsaw

You can build a guitar with just a jigsaw. It will do everything you need to do, it just won't do it as well as a scroll saw or bandsaw. The biggest problem with a jigsaw is that the blade is only fixed at one end. It stays fairly perpendicular when cutting straight, but will get pretty crooked cutting curves, especially in thick materials. If you are going to use a jigsaw, cut well outside your lines and sand-in.

More: Jigsaw ...

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