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Solitron Devices Fetrode Advertisement
March 1973 Popular Electronics

March 1973 Popular Electronics

March 1973 Popular Electronics Cover - RF CafeTable of Contents

Wax nostalgic about and learn from the history of early electronics. See articles from Popular Electronics, published October 1954 - April 1985. All copyrights are hereby acknowledged.

By the early 1970s, many types of vacuum tubes had already been replaced by solid state devices. A lot of the resistance by hardline lovers of glowing tubes was beginning to accept the reality of superior electrical characteristics of many types of germanium and silicon diodes and transistors over tube equivalents. During my enlistment in the USAF from 1978-1982, the vacuum tube diode used to trigger the pulse forming network for the airport surveillance radar (ASR) circuit was replaced with a plug-in solid state replacement. It seemed to work just as well. I don't recall ever having to replace the faulty vacuum tube version, so I cannot attest to whether the solid state version was an improvement. Part of the motivation for replacing tubes with solid state devices was obsolescence of the tubes, so maybe that is why it was done.

The "fetrode" introduced here by Solitron Devices was designed to be a plug-in replacement for the 6AK5 vacuum tube, which is a pentode amplifier. Although not specifically stated, I assume the name "fetrode" implies it was a field effect transistor (FET).

Solitron Devices Fetrode Advertisement

Solitron Devices Fetrode Advertisement, March 1973 Popular Electronics - RF CafeFeatures:

• Greater longevity

• No warm up

• No filaments to burn out

• No rewiring (direct replacement)

• Internally R. F. shielded

• Low dissipation: 1.3 watts (nominal)

• Plus 500 MHz operation

• Absolute low noise/distortion

This is a 6AK5 FETRODE

a solid state device that replaces a vacuum tube for:

Stereo Tuner • Amplifiers/OSC • Citizen Band Receivers/Transmitters • Radio/TV • Many More ...

Special Offer

During this introduction, you can purchase one (1) from us direct: Remit $5.00 plus 5% California state sales tax (Residents only), or if further information is required, please fill out the following coupon.

 

 

Posted December 1, 2017

Noisecom

About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024

Webmaster:

    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

Copyright  1996 - 2026

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All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

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