Restoring Valve/Tube Gear

Discussion in 'Amateur Radio News' started by M1MRB, May 10, 2020.

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  1. M1MRB

    M1MRB Ham Member QRZ Page

    ICQ Podcast Episode 324

    In this episode, Martin M1MRB is joined by Chris Howard M0TCH, Ed Durrant DD5LP, Frank Howell K4FMH and Bill Barnes WC3B to discuss the latest Amateur / Ham Radio news. Colin M6BOY rounds up the news in brief and this episode’s feature is the Restoring Valve/Tube Gear.


    We would like to thank our monthly and annual subscription donors for keeping the podcast advert free. To donate, please visit -

    News stories include: -
    • Register for Next EssexHam Foundation Online Amateur Radio
    • Long-Lost U.S. Military Satellite found by Amateur Radio Operator
    • Beyond Exams Resources Launched by the RSGB
    • FCC Providing Flexibility to Volunteer Examiners in Developing Remote Testing
    • RASA launches Welcome to AR guidebook for Newcomers
    • PRESENTER OPINION: A Way Back to Relevance for Amateur Radio?
    • Coronavirus: How Amateur Radio is Connecting People during Lockdown
    • Blind Amateur Radio Operator Promotes Hobby with New Aerial and Morse Code
    • Richard Newstead Retires from SOTABeam
    • Special Event Station GB0GIG (Gwasanaeth Iechyd Gwladol)
    The ICQPodcast can be downloaded from

    KG4BFR, YF8RQN, W6GH and 3 others like this.
  2. KA8VNG

    KA8VNG Ham Member QRZ Page

    I once got bit by a ten toed pentode !
    WB6TNF and K4FMH like this.
  3. KD4HNC

    KD4HNC Ham Member QRZ Page

    It's a tone oscillator, designed to be low distortion sine output, with cal controls for frequency, reference output voltage @ 0 attenuation, & an internal AC volt meter, that is also cal'able, using an external reference AC volt meter, & the attenuation set to 0 reference. You could pick your' own 0 reference, not necessarily 0.775 volt 0 dB. Maybe up to +20-30-40 dB, & use the atten to step down to 0 dB 0.775 volt. I bet you could take a HP VTVM, & mod it, to work like perfectly to this design. I like it!!! But I already have a sound technology 1700b.......... & it's solid state!
  4. K6BSU

    K6BSU Ham Member QRZ Page

    Correct. But where does it say "Be the first to identify this mystery circuit."
    KG5ILP likes this.

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