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Hi, I made a video of this little amp.
It's a single ECL86, with a real PT, salvaged from an old dual amp.
Recently I saw a philco signal tester on ebay, but couldn't buy it. In the end it gave me this design idea.
this one is the original one, couldn't find more pics.


And my version:



The circuit is very basic, would benefit from some tone shaping.
And a video>

Hi, this time tried a modified green ringer with another extra transistor and a controlled octave effect.
Had some problem with the etch, the paper wasn't right. I still need to calibrate the sensitivity of the sensor...

cheers

Hi guys,

just finished a one tube amplifier! It runs with a 12V adapter, and has a MAX1771 SMPS for the HV;

I built it in a 1590a box, with both sides etched in an old vintage style pattern.

This build was quite difficult, mainly because there is no board for the amplifir itself since everything is soldered between the potentiometer, the input jack and the tube socket.

I had to make the SMPS smaller too, so some capacitors are not soldered to the little board.

I would say it has something like 0.5W but has a nice overdrive!

Hope you like it, soon I will make a video !

Hi guys,

inspired by the TMC1 I tried to go a little furter decreasing output power and cost.

Here I present this typical one tube amplifier, that works with a SMPS instead of a big expensive PT.

The output transformer is also a cheap 220/6V transformer that I had laying around.









Cheers, Thomas

Cheers,
Thomas

Hi,
I couldn't find a build report of this pedal yet, so here are some pictures I made.

It's an easy build, so I wanted to make it small...ish!

Let's begin with the schematic:


and the build:




I used some wood pieces to maintain the board on place.

The shutter is a plastic piece from a shampoo (Yes I know)

I replaced the pot by a led/ldr and a parallel 100k resistor.

Volume is maxed.

Cheers!
Thomas