Monthly Archives: April 2015

Bose® 901 Series IV Active Equalizer #246341 Repaired

Cross-Posted from the Rain City Audio Repair Blog: This Bose® 901 Series IV Active Equalizer came through the shop recently with a variety of intermittent issues impacting its performance. These later series equalizers are still getting to be quite old, … Continue reading

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Extracting Screenshots from the HP 3585A Spectrum Analyzer

I’ve posted a few times about my HP 3585A spectrum analyzers over the past several months, and after chipping away at the problem I’ve finally solved the screenshots issue! It boiled down to a bad GPIB cable for my National … Continue reading

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Bose® 901 Series I Active Equalizer #41065 Repair

Cross-Posted from the Rain City Audio Repair Blog: This Bose® 901 Series I Active Equalizer came through the shop recently for an overhaul. It’s nearly 50 years old and the owner reported it had one channel beginning to drop out … Continue reading

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Accuphase C-200 Professional Pre-Amp Full Overhaul

When Kenwood’s engineers left to form Kensonic, they really brought their A-game, and this Accuphase C-200 pre-amp is no exception. It’s a mammoth device, built with exceptional attention to detail and top of the line components throughout. The owner reported … Continue reading

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Harmony H400 Tube Guitar Amplifier Repair

Cross-posted from the Rain City Audio Repair Blog: I recently had another Harmony amplifier, the  H400, through the shop for an overhaul. It’s owner, who previously sent me a Harmony H500 for service as well, took it to a local … Continue reading

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Bose 901 Series III Equalizer #181986 Repaired

Cross-posted from the Rain City Audio Repair Blog: Bose 901 Series III Active Equalizers are uncommon compared with the other series, but I did have one through the shop just recently. The Series III design – while a great performer … Continue reading

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