Retro 100watts into 8 ohms power amplifier module.

[nigelwright7557]

Retro 100watts into 8 ohms power amplifier module. (based on Maplin disco amplifier)

I have a couple of these.
LTP front end with DC servo.
VAS stage into CCS and Vbe multiplier.
MJ15003/4 outputs and all modern transistors.
Great sounding little amp.
£12-99 each.
p+p is £3-99 to UK and £11-99 rest of world.

An externally hosted image should be here but it was not working when we last tested it.

 

[nigelwright7557]

An externally hosted image should be here but it was not working when we last tested it.

 

[nigelwright7557]

A lot of effort was put into hum reduction on this amp.
Front end is RC decoupled from output stage.
The output stage was well decoupled too.
The DC servo saved messing around with DC offset pots.
A great sounding little amp.

 

[nigelwright7557]

Requires a 150VA 0-28 0-28VAC transformer for mono or a 250VA transformer for stereo.

 

[nigelwright7557]

I had great fun putting these together with the TO3 packages.
I used the pcb as a drilling template to get the holes spot on.

 

[nigelwright7557]

Based on the 1980's Maplin disco amp but with only two output transistors.
Uses easy to find modern transistors.