Author Archives: retrovoltage

The Speaker Spotter — November 8, 2026

Posted on November 8, 2026 by retrovoltage

A recurring feature curating interesting speakers for sale on Craigslist from around the Pacific Northwest. Links to Craigslist postings might go down at any time if they’re sold or pulled from sale. Technics Home Speakers SB-7070 – Adult Owned – … Continue reading →

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Retrovoltage Workbench Through The Years

Posted on November 7, 2026 by retrovoltage

A visual history of the Retrovoltage workbench, from 2009 through today, while we wait for a few projects to wrap up. Continue reading →

Posted in Collections, Commentary, DIY, Electronics, Gadgets, Hardware, Ideas, Test Equipment | 1 Comment

Old Crock-Pot Slow Cooker Repair

Posted on November 1, 2026 by retrovoltage

Fixing an old Crock-Pot slow cooker which had become unreliable. Turns out the only electrolytic capacitor in the whole appliance, on the control board, was on the way out and was leaking and losing capacitance. A new one swapped right in, and after a test run, everything seems good as new. Continue reading →

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The Speaker Spotter — October 30, 2026

Posted on October 30, 2026 by retrovoltage

A recurring feature curating interesting speakers for sale on Craigslist from around the Pacific Northwest. Links to Craigslist postings might go down at any time if they’re sold or pulled from sale. A bit light on interesting stuff this week, … Continue reading →

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The Speaker Spotter — October 18, 2026

Posted on October 18, 2026 by retrovoltage

A recurring feature curating interesting speakers for sale on Craigslist from around the Pacific Northwest. Links to Craigslist postings might go down at any time if they’re sold or pulled from sale. KLH Model 24 Vintage Speaker Pair – $60 … Continue reading →

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Everything to Know about Bose 901 Series V Active Equalizer and Speaker Repair

Posted on October 12, 2026 by retrovoltage

A detailed look at the Bose 901 Series V speaker system and Active Equalizer, with a brief history, plus repair tips and tricks, schematics, equalizer curves, and a parts list with direct links to buy what you need. Continue reading →

Posted in Audio, Bose, DIY, Electronics, Hi-Fi, Stereo, Vintage | Tagged , , , , , , , , , , , , | 2 Comments

KLH Transistor Substitution Guide (“Solid State Components Cross Reference Guide”)

Posted on October 6, 2026 by retrovoltage

This post contains the transcribed text of the Februrary 1970 KLH Solid State Components Cross Reference Guide (aka, transistor substitution guide), obtained from an original copy of the document. It’s in this format because it’s easier to search and find quickly. Continue reading →

Posted in Audio, Electronics, Hi-Fi, Resources, Vintage | Leave a comment

The Speaker Spotter — October 2, 2026

Posted on October 2, 2026 by retrovoltage

A recurring feature curating interesting speakers for sale on Craigslist from around the Pacific Northwest. Links to Craigslist postings might go down at any time if they’re sold or pulled from sale. 1977 Klipsch La Scala $3,500 · Portland Someone’s … Continue reading →

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The Speaker Spotter — September 26, 2026

Posted on September 26, 2026 by retrovoltage

After a short hiatus while I sorted out some tech issues with automation that helps me create these posts, we’re back! The Speaker Spotter is a recurring feature curating interesting speakers for sale on Craigslist from around the Pacific Northwest. … Continue reading →

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New Bench Gear: September 2026

Posted on September 4, 2026 by retrovoltage

A few new pieces of gear join the bench in September 2026: an HP 53181A frequency counter, and a Tektronix 434 Storage Oscilloscope. Continue reading →

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