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    Profile photo of Jordan Dobrikin
    Jordan Dobrikin
    Forum Participant

    Welcome, Jordan Dobrikin
    Semiconductor replacement of tubes in Antique pre 1930’s radios
    Tagged: Antique Tube Radios, Steampunk, Transistorize
    July 14, 2017 at 4:02 pm
    Jordan Dobrikin
    Forum Participant
    Looking for comment, advice, assistance retrofitting transistorizing pre 1930’s Tube Radios to lower safer voltages
    Are these suitable
    RF Amplifier PC Board 2N5109 PC Board or Kit
    DC 12V 10KHz-1GHz 10dBm RF Broadband Low Noise Amplifier LNA Module HF VHF UHF
    AntiqueRadio Tube Replacment/Substituion
    I am seeking help, advice assistance and comment on replacing ALL the Tubes in Antique Radios with Transistor/Semiconductors that will operate at lower, safer voltages.
    The main target is the RF Stages of TRF Radios and to a lesser extent Regenerative Receivers.
    Detection and Audio will be handled by a simple Detector (Crystal) and Audio Amplifiers on a small PC Board readily available on Ebay.
    I want to explore the idea of using Radios on a Chip and receiver PC Boards using “Radio on a Chip” chips. Picking up the RF at the input to the detector/audio amplifier and shunting off theunused audio to ground
    TRF radios with 2, 3, & 4 Tuned RF Stages; like the Atwater Kent Models 20C and 30
    Regenerative Receivers Radiola III, Radiola IIIA and Westinghouse RADA
    73 de Jordan ve7jjd
    STEAMPUNK Radios/Receivers: Crystal TRF & Regenerative
    Objet d’art Plural Objets d’art
    Radios: Building Crystal TRF and Regenerative Radios using Antique/Vintage Components, along with modern electronics and components (Transistors, Semiconductors, Radios on a Chip, Op Amps) to come up with Objets d’art Sculptures that are also highly functional Radios.
    (Variometers, Variocouplers, Cats Whiskers, Variable Condenser/Coil Assemblies, Vernier Dials)
    Receiverstransistorize: Retrofitting Antique Receivers/Radios, Crystal, TRF and Regenerative to operate sans Cabinetry at safe, low voltages. Both Hollow-state and/or Solid-state.
    Atwater Kent Model 20C (original tubes: UX 201A & UX 200A)
    Radiola III (original tubes: WD 11; UX 199; UX 120)
    Radiola IIIA (original tubes WD11; UX 199, UX 120)
    Westinghouse RADA (original tubes UV 200, UV 201, WR 21)
    Metrodyne Super Five

    Profile photo of Gary Albach
    Gary Albach
    CVRS Member

    Hi Jordan – sounds like you are mainly interested in solid-state replacements for 01A tubes as used in the AK 20C and AK30, and for WD11 tubes as used in the Radiolas. A popular replacement for the 01A is a circuit using a small light bulb and a photoresistor with an FET, with a detailed discussion here:

    Kris in Vancouver has made a number of these replacements:

    One point noted in the ARF thread is that you might expect to have to do some tweaking of each stage in a TRF to get it to work properly with all SS replacements.

    For WD11 replacements in my Radiolas, I have recently fabricated substitutes using miniature 5676 tubes inside cut-off test tubes attached to custom bases, and hopefully will publish the construction details in a future issue of the CVRS Newsletter. I haven’t found an FET circuit to substitute for the WD11 so have taken it as a challenge to come up with one for the Newsletter at the same time.

    In general, the SS replacements I’ve tried work quite well. The solid-state 1L6s in my TransOceanics give better performance than the original tubes.
    You also mention trying ‘Radios on a Chip’. Not sure how you will get at the input to the detector inside the IC package, but the venerable MK484 chip (now TA7642) is available on eBay at 10 for a US dollar (with free shipping!).

    Profile photo of Gary Albach
    Gary Albach
    CVRS Member
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