Tag Archives: tube

Raytheon, “The Healthy Tubes”

What makes these tubes healthy compared with the others, anyway? Radio Retailing, April 1929 Advertisements

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Vintage Engineering is Beautiful

EL84 output tubes in an EICO HF-81 integrated stereo amplifier.

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New Toy: HP 143 Wide-Screen Oscilloscope Mainframe Restoration – [Part 1]

At the risk of becoming a test equipment collector, I am picking up a few pieces of vintage test equipment that need some work, but will be very useful pieces of shop gear as well as interesting pieces of history … Continue reading

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1937 Detrola 139E Vintage Radio Repair

I just finished a new project over at Rain City Audio – 1937 Detrola 139E Vintage Radio Repair

This Detrola 139E chassis was on my bench recently while the cabinet was being refinished. It’s a striking 1937 radio with an art deco stationized dial with a very large tuning area, and even though it only has 5 radio tubes, it’s a great performer. I replaced the rectifier tube and rebuilt the electronics of the radio followed by testing and an alignment; now it’s very selective and will be a safe and reliable appliance for someone’s home.

Check it out at http://www.raincityaudio.us/blog/1937-detrola-139e-vintage-radio-repair! Continue reading

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Oregon Electronic Model A3 Variable Voltage Regulated Power Supply

Here’s another project I just finished at Rain City Audio:

This vacuum tube power supply from an engineer’s test bench can replace a radio or test circuit’s power supply to help with troubleshooting or experiments, with up to 400V for B+ and 6.3V 5A for the heaters. It needed some new capacitors, then fired right up and works perfectly! 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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Antique Tube Box Art

I took a gamble on a box-lot of parts from Craigslist, and it turned out to be an excellent find. One of the things I found was a collection of tubes in their original boxes from 1926. That doesn’t happen … Continue reading

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