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De-smarting the Marshall Uxbridge
This is the story of a commercially unavailable stereo pair of the bi-amped Marshall Uxbridge, with custom-built replacement electronics: active filters feeding two linear power amps. Listening to this high-fidelity set has brought me immense enjoyment.
There are a couple flexible flat cables connecting to auxiliary boards hosting the volume and tone controls (plus the mics and push-buttons) on the top, and four RGB LEDs at the bottom of the front plate. Having done those back of the envelope estimates, I was still quite uncertain about the amount of heat I could expect the LM1875’s to dissipate, and wanted to gauge heatsink temperatures (with the scientific “finger method”) both while idle and with realistic listening volumes. It appears that analog electronics in the audio range is more or less a solved problem: discounting the obvious extremities of high power (hundreds of watts) or really miniscule signal levels (microvolts), it is not too difficult to create, with contemporary semiconductors, a simple circuit charting seriously audiophile territory!
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