NAD: Marshall 1987x (J.F)

My parts have arrived.

Post Phase Inverter Master Volume (PPIMV), Lar/Mar style like in the Suhr SL68 and Friedman's new Plexi amp.
The amp is usable at all volumes now, form quiet conversation volume to full blast.

PPIMV.jpg


The PPIMV knob is on the back in place of one speaker jack.

Knob.jpg


Elevated heaters at about 80vDC, did the same on the 2203x, much less hum now.
Small turret board, 2 resistors, 1 Cap.

Elevated Heaters.jpg



In the sound clip you'll hear when I turn down the volume and boost it in post (DAW), the sound becomes less flat and has more prominent impedance curve tone, it retains almost the same amount of gain.

Timestamps.
0:00-1:00 Starting with full volume.
1:00-2:00 Bedroom volume and boosted in DAW.
2:00-2:40 Full volume again.
2:40-3:00 Bedroom volume and boosted in DAW.
3:00-End Demonstrating volume range.

 
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