Tag Archives: amplifier

Sony TA-4650 VFET Stereo Integrated Amplifier Check-Up

This repair cross-posted from Rain City Audio: I recently had this Sony TA-4650 in the shop for a check-up. It was reportedly giving static in one channel. That’s trouble on an amp like this – Sony used an ambitious new technology, the VFET, a … Continue reading

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Wanted: Vintage HP 1400-Series Vertical Amplifier Plug-Ins for Oscilloscope

I’m looking for plugins for my HP 143A Wide-Screen Mainframe Oscilloscope which I’m in the process of restoring. I’d love to run it as a 15″ high speed X-Y display, and to do so needs matched vertical amplifier plugins in … Continue reading

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Bose Equalizers on eBay Need Service Too: A Photo Comparison

You’ve had your Bose 901 Series I or Series II speakers in storage for a few years, the Active Equalizer packed away with them and now you’ve pulled them out to set up your vintage system once again. Great – … Continue reading

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KN0CK and KF7LZE RTLSDR for HF Back In Stock at Easy-Kits.com!

Edit: Easy-Kits.com is offline, but still for sale! Click through.  We’ve completed the next production run of Rev 5 direct-sampling RTLSDR with HF converters by KN0CK ! Rev 5 Direct Sampling HF RTLSDR with Amplifier

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1977 Yamaha CR-2020 Vintage Stereo Receiver Repair

If you’re looking for a repair for this particular model of receiver, sorry – Rain City Audio no longer takes Yamaha CR series for repairs due to them requiring such an extreme amount of work. This post is a good … Continue reading

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Don’t Trust Everything You Read (On Old Radio Schematics)

Electrical drafting is primarily done on a computer today, with software such as EAGLE or KiCAD. This wasn’t the case back when tube radios ruled the airwaves, though – schematics were drawn up by engineering draftsmen by hand. And as … Continue reading

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Thrift Store Jamo MPA-101 Repaired – She’s Back Up and Running!

I started working on a Jamo MPA-101 amplifier back in August for a friend and after some early work it sat for a while. He’s re-doing his audio system at home so I spent a few hours to finish troubleshooting … Continue reading

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New Project: Jamo MPA-101 Amplifier Repair

Project’s Conclusion Here My friend brought me this Jamp MPA-101 amplifier he picked up at a garage sale, complaining in only puts out some rumbling and humming. It looks like it’s suffered a failure in the power supply at some … Continue reading

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Build Log and Review: Mable Audio VT-86PP Kit Hi-Fi Amp Project [Chinese Gear]

About a year ago, someone left a comment that really looked like spam on one of my pages advertising a web store selling tube audio gear and parts for guitar and audio amplifiers. Against everything I’ve ever learned about behaving … Continue reading

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Huge and Powerful: The 1937 GE F-135 Repair Complete

I’ve finally had the time to finish one of my long-running projects repairing GE’s most powerful radio offering from 1937, the GE F-135. I picked it up from Craigslist back in November but other responsibilities kept me from getting much … Continue reading

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