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Retro 100watts into 8 ohms power amplifier module.
Retro 100watts into 8 ohms power amplifier module.
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Old 22nd September 2019, 01:18 AM   #1
nigelwright7557 is offline nigelwright7557  United Kingdom
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Default Retro 100watts into 8 ohms power amplifier module.

I have a couple of these.
LTP front end with DC servo.
VAS stage into CCS and Vbe multiplier.
MJ15003/4 outputs.
Great sounding little amp.
12-99 each.
p+p is 3-99 to UK and 11-99 rest of world.
Click the image to open in full size.
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Old 29th September 2019, 02:22 AM   #2
nigelwright7557 is offline nigelwright7557  United Kingdom
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Click the image to open in full size.
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Old 4th October 2019, 04:16 AM   #3
nigelwright7557 is offline nigelwright7557  United Kingdom
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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.
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Old 5th October 2019, 05:19 AM   #4
nigelwright7557 is offline nigelwright7557  United Kingdom
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Requires a 150VA 0-28 0-28VAC transformer for mono or a 250VA transformer for stereo.
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Old 11th October 2019, 01:00 AM   #5
nigelwright7557 is offline nigelwright7557  United Kingdom
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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.
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