TC-15 Details
Build notes specific to this amp from Mitch.

This is a two channel amp based on the the Matchless DC30 except it only has one pair of output tubes. I didn't build this one from scratch, I purchased most of the parts including the board, chassis and front panel from an outfit in Toronto called Trinity Amps. I did the electronic assembly and built the cabinet.

This amp has a push/pull power amp operating Class AB. It uses two EL84 tubes made by TungSol in Russia with a TungSol 12AX7 for the phase inverter. It has a master volume control that can be switched in and out of circuit. Power output is 15 watts.

The preamp has two channels, one uses a single EF86 tube, the other uses a couple of 12AX7's. Each have their own volume and tone controls. The 12AX7 channel has two gain stages with bass, mid and treble controls. The EF86 channel has a single gain stage and it has a six-position rotary switch to change the tone. All the tubes are made by TungSol.

The power supply uses a 5AR4 rectifier tube made by Sovtek in Russia.

The amp has Alpha pots, Trinity transformers and Cliff jacks.

It has an 11 gauge aluminum chassis with a black faceplate.

I began by installing all the tube sockets, transformers, pots, switches and jacks on the chassis.

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I wired up the AC, the power transformer, the heaters, the output transformer secondary, the jacks and the pots.

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I started working on the eyelet board next. I installed all the wiring on the bottom side, then I started working from left to right installing the resistors and capacitors on the top side. I also attached all the flyoff leads.

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All that was left now was installing the board and wiring it to the tube sockets and pots.

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I did the final checks, installed the tubes and checked it some more. Everything was good. It worked the first time and sounded fantastic when I plugged in a guitar and a speaker!

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I built the cabinet next. I used a hardwood from Africa called padauk. It's orange when freshly planed or sanded. It turns redder with age and once a finish is applied. I've already planed the wood to final thickness, cut the pieces to size and routed dovetails on the joints in these photos.

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Rounding all the edges with a router and sanding came next. It's pretty hard to build an amp or speaker cabinet without a router. I have several!

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I finished the cabinet by spraying on five coats of clear lacquer.

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I finished the front and back panels by spraying on three coats of hammertone paint. The vent grills are just perforated steel. The front one was spray painted black, the back one was left natural. The teak panel in the photo is for another project.

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I installed feet and a handle, bolted in the amp chassis and the project was finished!

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