Category Archives: Electronics

Bose® 901 Series VI #181070 Repair

From Rain City Audio: This Bose® 901 Active Equalizer, Series VI, came into the shop recently. These are some of the most recently produced Active Equalizers, although they’re still potentially a few decades old at this point in time. This … Continue reading

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Bose® 901 Series II #65097 Overhaul

This Bose® 901 Series II Active Equalizer, #65097, just came through the shop for an overhaul. It worked briefly, but failed quickly on its original components. Nothing that an overhaul can’t take care of! This particular unit had its three … Continue reading

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1934 RCA Victor T4-8A Bluetooth Upgrade

From Rain City Audio: This was an interesting little project which came through the shop, a 1934 RCA Victor T4-8A cathedral radio. This radio had been fully restored, down to the bare metal of the chassis and completely re-wired by … Continue reading

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1951 EMC 211 Service Tube Tester Refurbish

From Rain City Audio: I don’t often work on test equipment, but sometimes I take a tube tester or similar for service. This one in particular is a 1951 EMC Model 211 tube tester, a quick and simple emissions tester … Continue reading

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Bose® 901 Series II #114658 Repair

From Rain City Audio: This Bose® 901 Series II Active Equalizer, #114658, just came through the shop for repair. It had stopped performing the proper equalizer functions, and so was time for an overhaul. Inside, it looks like the smaller … Continue reading

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Bad Caps in Everything

I just had a bit of a scare with my Audio Precision analyzer. The 2004-era Dell OptiPlex GX270 which drives the AP hardware decided it would refuse to power up – just flashing the “ON” light for a fraction of … Continue reading

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Bose® 901 Series II #71033 Overhaul

From Rain City Audio: This Bose® 901 Series II Active Equalizer, #71033, came into the shop for an overhaul recently. It was showing some signs of age, in this case, a bad left channel. Nothing Rain City Audio can’t fix! This … Continue reading

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