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Discrepancy Sheet

Found in the Attic: Broadcast Electronics 500

Posted by Tom Vernon on January 26, 2016

Spotmaster 500An earlier installment of Found in the Attic looked at the ATC/Collins P-190 cart machine, which was the first commercially available tape cartridge deck, and the hit of the show at NAB '59. Around that time, Ross Beville, Chief Engineer of WWDC in Washington, DC had the same idea, and also began to develop tape cartridge machines. He apparently did not know about the work of ATC's Bailey and Jenkins until NAB '59. In June of 1959, Beville founded Broadcast Electronics in Silver Springs, MD, to manufacture Spotmaster cart machines. The first production runs were built in the station's garage.

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Topics: Vintage Radio Technology

Found in the Attic: Yaesu FRG-7

Posted by Tom Vernon on December 30, 2015

Yaesu FRG-7The hobby of short wave listening is not dead. OK, there aren't as many choices as there once were. Many European short wave broadcasters have abandoned their transmitters and towers in favor of online streaming as the economic slowdown strangled the budgets of many operations. Still, there are enough stations out there to keep the hobby alive. So, put on your bellbottoms as we go tripping back to the 1970s to check out a Yaesu FRG-7 communications receiver, affectionately nicknamed the 'FROG 7'.

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Found in the Attic: Technics RS-686DS Portable Cassette Recorder

Posted by Tom Vernon on December 30, 2015

Technics RS-686DSThe last installment of Found in the Attic examined the Uher 4000 series of portable reel recorders, which were widely used by radio news departments before cassette recorders were common.

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Found in the Attic: AC VTVM

Posted by Tom Vernon on December 29, 2015

AC VTVMA good AC VTVM is an essential tool for troubleshooting analog audio gear, and was also needed for the annual FCC proof-of-performance measurements back in the day. B&W 410 and HP 403B meters were frequently seen on the bench at many stations, but an equally-impressive but less remembered device was the Navy ME-6D/U. This installment of Found in the Attic recalls this often overlooked AC voltmeter.

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Topics: Vintage Technology

Found in the Attic: RF Test Twofer

Posted by Tom Vernon on December 28, 2015

Millen 90651 Grid-Dip Meter & Heathkit HD-1250It's hard to believe in this day of digital technology and broadband RF strips, but at one time a solid understanding of tuned RF circuits was an essential part of electronics troubleshooting, as well as to getting your FCC First Class License. Today, the grid-dip meter is all but forgotten, but it was, and still is, an essential item in the RF engineer's toolbox. This Found in the Attic is another twofer, and looks at both the Millen 90651 Grid-Dip Meter and Heathkit HD-1250 solid-state dip meter.

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Topics: Vintage Radio Technology