Small guitar amp build

a fine line between stupid and clever

Small guitar amp build

Postby EWBrown » Fri Jan 30, 2015 8:45 am

https://www.youtube.com/watch?v=wpmjaym ... 1422579428

Published on Nov 19, 2014

Original circuit all tube amp build. About 10 watts, 2x 12AX7 preamp tubes, 1 EL84 output tube. Cabinet is made from Puriri wood/Carbon fibre shell. 1 Bright switch that changes a cathode cap (from 25uf electrolytic cap to .1uf film cap) and incorporates a bright cap on the first gain stage. No tone stack. Clean channel and gain channel is switchable. Jupiter Vintage Tone caps, PRP metal film resistors. Chassis and PT are from an old NZ made tube radio. OT is Mercury Magnetics.
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Re: Small guitar amp build

Postby Gingertube » Tue Feb 10, 2015 8:50 pm

I enjoyed the build video.
To Nit-Pick, 1 EL84 means Class A Single Ended which means just less than 6 Watts at 10% THD flat out.
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Ian
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Re: Small guitar amp build

Postby EWBrown » Tue Feb 10, 2015 9:47 pm

He's using the old "peak music power" wattage "measurements" which are based on imagination and marketing, instead of engineering standards.

There is a similar "effect" applied to a certain set of "400 watt" computer speakers, which are powered by a 12VDC, 1 AMP PSU "brick". =:o (sick) (666) :'( :( (n)
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Re: Small guitar amp build

Postby beach » Sun Apr 19, 2015 5:56 am

Pretty impressive.

I am in the midst of designing a similar amp. Most parts from an existing 1958 pick-up amplifier, but I want more gain for an electric guitar. I have 2 designs now, one with an overall feedback and the other just straight forward amplification, no feedback. 1x ECC83 (both parts used) and 1x EL84 would make a nice 3-stage single ended amp.

So I wonder how your circuit schematic looks like. Could you post it to me pls? Can I download it somewhere?

Thanks
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