Category Archives: Test Equipment

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

Posted in Electronics, Projects, Test Equipment, Vintage | Tagged , , , , | 1 Comment

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

Posted in Computers, DIY, Electronics, Test Equipment | Tagged , , , , | 3 Comments

Bose® Active Equalizer Test Platform

This project is going to take a while since I’m slammed in the shop, but I’m in the process of converting a Bose® 901 Series I Active Equalizer to  a test platform. With sockets for the transistors, and clip connections … Continue reading

Posted in Audio, Bose, DIY, Electronics, Stereo, Test Equipment | Tagged , , , , , | 3 Comments

Retro 1956 Cyclometer VTVM – Hycon Model 615

A pretty cool, very rare piece of test equipment turned up on eBay recently: a 1956 Hycon model 615 AC/DC VTVM. This was a precursor of today’s digital, using analog servo circuitry to drive the numeric digit display. These were … Continue reading

Posted in Electronics, Gadgets, Test Equipment, Vintage | Tagged , , , , , | 2 Comments

What’s On Your Workbench?

People ask me what kind of gear I use at Retrovoltage and at Rain City Audio for projects. So, here we go: While it’s by no means the best-equipped workbench out there, it has a good mix of lab- and service-grade … Continue reading

Posted in Collections, Commentary, Test Equipment | Tagged , , , , , , , , , , | 6 Comments

Tektronix 575 Mod 122C Curve Tracer Restoration Project – Part 1

A while back I picked up a Tektronix 575 Mod 122C transistor curve tracer from Craigslist and just started digging into it. With some encouragement from reader petepdx, I’ve started actually looking into fixing it up. (Click the photos for a much larger … Continue reading

Posted in Commentary, Electronics, Test Equipment, Vintage | Tagged , , , , , , , , , , , | 16 Comments

Collector or Bargain-Hunter? There are Craigslist deals out there.

If you’re like me and have a liking for vintage electronics, you’ll know that they turn up in a lot of places. Craigslist tends to be a pretty good spot for radios and even piles of tubes from time to … Continue reading

Posted in Commentary, Test Equipment, Vintage | Tagged , , , , , | 7 Comments