All 4-1000 gurus step inside

Discussion in 'Amateur Radio Amplifiers' started by W4EKY, Jan 16, 2017.

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  1. KM1H

    KM1H Ham Member QRZ Page

    Those are the common 4-125A to 4-400 plus 3-400Z and 500Z sockets by Johnson. Same as in my LK-500ZC
  2. N2EY

    N2EY XML Subscriber QRZ Page

    If it works, no problem.

    But, consider: to get more than 1 kW output on 6 the plate is probably dissipating in excess of 500 watts. While it may not show color, it's getting warm at that level.....

    Yes they're really well made. And they've lived their lives in dry conditions....

    73 de Jim, N2EY
  3. W4EKY

    W4EKY Ham Member QRZ Page

  4. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

    I'd say the Murata is "out." No RF current ratings of any kind, RF amps are not listed in potential applications, and I see they only plot D.F. up to 1.0 MHz, where it starts rising quickly. As a result, I'd say those are not "RF" capacitors at all.

    No idea on the Sprague without actual part numbers and spec sheets.
  5. K8SJ

    K8SJ Ham Member QRZ Page

    2 x 4-1000 Cliff Kurtz (SK N6ZU) amp needs love. Suggestions appreciated. K8SJ

    Attached Files:

  6. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

    What doesn't work about it?

    Impossible to tell or diagnose anything using photos...
  7. K7RJB

    K7RJB Ham Member QRZ Page

    Last edited: Dec 1, 2019
  8. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

    That could cause an issue.:p

    But the filaments alone could make a cool night light.
  9. N8CBX

    N8CBX Ham Member QRZ Page

    If you put 6kv on the plate, that will put the plate loading out the roof. In other words, plate load of about 5,000 ohms? And if thats the case, it has nowhere enough inductance (for a Q=12).
    Jan N8CBX
  10. W2VW

    W2VW XML Subscriber QRZ Page

    Hey, that's a really good solution for dealing with IMD on the HF bands. Thanks!

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