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Monthly Archives: June 2014
1958 Zenith Royal 500 Portable Transistor Radio Repair
This 1958 Zenith Royal 500, an early 8-transistor portable AM radio, came into my shop for a complete overhaul. I replaced several badly out of spec capacitors, added some insulation to correct a short circuit in two of the batteries and gave it an alignment. This is a perfect radio to take to the beach or the park while listening to a ball game, just like they’d have done back then. Many tear-down photos inside!
Bose 901 Series II Active Equalizer #114743 Repair
This Bose 901 Series II Active Equalizer got a full overhaul in the shop with all new capacitors, resistors, transistors and silicon diodes. After a thorough control cleaning, it sounds absolutely fantastic once again and should last for a long time to come.
Posted in Audio, Bose, Hi-Fi, Stereo, Vintage
Tagged Bose, Bose 901, Bose Active Equalizer, Bose Equalizer, bose equalizer repair, bose repair, capacitor, capacitor replacement, repair, vintage
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1962 Coronet 6 Transistor Shirt-Pocket Radio TRN-6
This rare early shirt-pocket transistor radio, the Coronet TRN-6, needed a few new capacitors to sound its best. It delivers surprising performance from such a small package! Plenty of tear-down photos in this article.
Posted in Radio, Radios and Tubes, Vintage
Tagged 6 transistor radio, capacitor, capacitor replacement, Coronet, coronet 6 transistor radio, coronet transistor radio, coronet trn-6, photos, portable transistor radio, repair photos, seattle vintage radio repair, shirt-pocket radio, transistor radio, transistor radio repair, trn-6, vintage
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1936 Zenith 5-S-29 Electrical Restoration and Alignment
This 1936 Zenith 5-S-29 was in the shop for a complete overhaul with all new resistors and capacitors, a new dial lamp socket, tube testing and alignment. After all that service, it looks and sounds fantastic and is going to last for a long time to come in a local collection.
Bose 901 Series I Active Equalizer #41550 Repair
This Bose 901 Series I Active Equalizer, serial #41550, came into my shop in need of an overhaul after being stored somewhere sticky for many years. After a rebuild and thorough control cleaning with high powered solvents, this equalizer performs good as new! All new capacitors, resistors, transistors and neon bulb will last for a long time to come.
Posted in Audio, Bose, Stereo, Vintage
Tagged Bose, Bose 901, Bose Active Equalizer, Bose Equalizer, bose equalizer repair, bose repair, capacitor, capacitor replacement, repair, seattle radio repairs, vintage
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Bose 901 Series II Equalizer #58189 Repair
This Bose 901 Series II equalizer came into my shop recently. It had one good channel, but the second channel was experiencing a large amount of distortion. No wonder why, the unit was mostly original, although it had some evidence of being serviced before.
Inside, about half the capacitors…
Posted in Audio, Bose, Vintage
Tagged Bose, Bose 901, Bose Active Equalizer, Bose Equalizer, capacitor, capacitor replacement, vintage
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KN0CK Amplified RTLSDR for HF Rev. 5 is Back!
After some technical difficulties, the KN0CK Amplified RTLSDR for HF Rev. 5 is back! Now for sale directly through blog.KF7LZE, and including free shipping in the United States, and a free PAL to BNC adapter with purchase! Everything you need to … Continue reading
Posted in Electronics, Gadgets, Radio
Tagged dongle, hf, KN0CK, RTL-SDR, RTLSDR, SDR#, up-converter, Upconverter
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Bose 901 Series II Active Equalizer Repair #126500
This Bose 901 Series II Active Equalizer came into the shop for a complete overhaul after it suddenly stopped working entirely. While in the shop it also got upgrades to the output capacitors and added 4%-silver solder for the lowest joint resistance possible. After a full rebuild and live listening test it’s ready to go back home and serve faithfully for many years to come.
Posted in Audio, Bose, Stereo, Vintage
Tagged 901, 901 Series II, Bose, Bose 901, Bose Active Equalizer, Bose Equalizer, capacitor upgrade, vintage
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