thomaseh

[thomaseh]

I built this small guitar/ukulele for fun.

The neck-trough design was sculped from a single slab of pine, dyed and finished with teak oil.

The pickup cover, wraparound tailpiece and pickguard were handmade. The tailpiece was made from a block of aluminium from a power supply heatsink. I left some of the grooves to position the F string saddle.

It has a 17" scale, and uses standard guitar strings. I tuned it to G, C, F, A#. It is the same as the four upper strings of a standard guitar with a capo at the 3rd fret. This way I can play some power chords on it.

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Small loFi looper with modulation.

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U-boat octave pedal in small-ish box. Enjoying the synth setting.

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Push-pull amplifier using 5672 direct heated tubes

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1W push-pull amplifier with 12AU7

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1W orange style amplifier using internal SMPS instead of a power transformer. Front plate and 1590N1 box etched. 

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External tap tempo and analog delay clock

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Small analog delay with 2xMN3005 (dirt bag inspired) in a 1590LB

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12AX7-12AU7 SE tube amplifier

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Hollis Ultra flanger with the V3207

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Diamond style grill cloth for this small bluetooth speaker. 

[thomaseh]

Battery powered tube amplifier using russian tubes 1J24B and 1J29B. Two Li-Ion batteries are used to provide enough voltage for the filament series arrangement and to supply the MAX1771 SMPS which boosts the 7.4V to 100V for the plates. The heater wiring only requires 35mA of current. The output stage is in Push-pull, driven by a paraphase PI. The total output is 0.3W , which is quite loud to play in a living room. Nice practice amplifier with lots of gain and distortion. The 4″ speaker works nice in this 180x180x80mm box, from an old ammeter.