Ameritron Amplifier Problem

Discussion in 'Amateur Radio Amplifiers' started by K9JBX, May 9, 2020.

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  1. W9GB

    W9GB Ham Member QRZ Page

    DO NOT Like the Coaxial Cable connection to PC Board (Not Clean Solder Connection).
    BREAK in the SHIELD?
    7EAE85D2-0554-4794-9107-628F7B7484C1.jpeg
     
    K9JBX likes this.
  2. K9JBX

    K9JBX Ham Member QRZ Page

    I ordered the stock parasitic supressor which is a small circuit board.
    Ameritron (Bob) told me that years ago some guy was selling these copper strap supressors online that is in my amp right now, claiming improved output, but wasn't worth as much as an ounce of fairy dust!
    I tried to order the soft-start relay (open frame style) but he told me that the relay is no longer available.
    If anyone knows of a replacement for this relay please post it here. I'll be looking myself too.
    I explained the problem I was having with the 10/12 meter input not tuning and he suggested I re-solder everything on the input board even if the solder joints looks good.
    I may try this but since the 10/12 meter coil tunes just fine doing it cold with a 100 ohm resistor from filament to ground and the antenna relay manually closed, I have my doubts that the problem is on the input board itself.
    A new input board would cost $162.00
     
  3. W9GB

    W9GB Ham Member QRZ Page

    Determine the OEM Supplier and Part Number, Coil Voltage & Coil Resistance (ohms).

    At the Millennium, a number of electronics company mergers occurred (products discontinued). In 2003, global RoHS forced electronics manufacturers to “retool” any production equipment OR manufacturing processes that used Lead OR other RoHS banned materials (Cadmium).
    ==

    Your Open Relay looks like the Potter Brumfield “KR” series relay.
    Very popular in 20th century equipment. NTE made replacements, for a few years.

    Potter & Brumfield Relay Catalog, March 1967
    from The Bunker of Doom
    http://www.bunkerofdoom.com/relay/pb/KR.pdf

    Potter & Brumfield was purchased by TE Connectivity and Princeton Indiana plants closed.
    “KA” series is still manufactured by TE Connectivity (Mouser/Digi-Key)
    NOT CHEAP
    https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Data+Sheet1308242_KRPA0715pdfEnglishENG_DS_1308242_KRPA_0715.pdf9-1393101-9

    ===
    RF PARTS (San Marcos, CA)
    Relays
    https://www.rfparts.com/relays.html
    Open Frame Relays
    https://www.rfparts.com/relays/relays-openframe.html

    Surplus Sales of Nebraska (Fort Calhoun, NE)
    Relays
    https://www.surplussales.com/index/Relays.html
    Open Frame Relays
    https://www.surplussales.com/Relays/REContOF-1.html
     
    Last edited: May 27, 2020
    W5HEH, W1TRY and K9JBX like this.

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