Ultimate Conversion of the Super Pro Receiver ?

Discussion in '"Boat Anchor" & Classic Equipment' started by AB1ZK, Feb 11, 2020.

ad: L-HROutlet
ad: l-rl
ad: Left-3
ad: L-MFJ
ad: Left-2
ad: Subscribe
  1. AB1ZK

    AB1ZK Ham Member QRZ Page


    Came across an article from CQ April 1961 written by Charles Reed regarding a number of mods to the Hammarlund Super Pro series. The end result of the modifications is a receiver with a built in power supply, product detector, cascode first stage RF, grounded grid second stage RF, antenna trimmer, IF gain control, and new audio stage.

    Has anyone in the forum experience with these modifications ?

    I have a BC779 in original working condition and a SP400X that I have "messed with" for many years.

    I'm considering some changes to the SP400X only.

  2. KA0HCP

    KA0HCP XML Subscriber QRZ Page

    How about providing a link to the magazine?
  3. N2EY

    N2EY Premium Subscriber QRZ Page

    There's some great stuff on BAMA, too.
  4. AB1ZK

    AB1ZK Ham Member QRZ Page

    I have a paper copy of the article that I bought from CQ magazine in the past. It looks like you can get them online but have to pay some.

  5. SM0AOM

    SM0AOM Ham Member QRZ Page

    I had one of these SP-110 receivers that had been modified in these ways, with cascode RF and a
    four-crystal SSB lattice filter.

    Some modifications were beneficial, but removing the p-p 6F6 audio
    stage in favour of a single 6V6 did not help much.

    A lot of the appeal of the Super-Pro lies in its audio chain.

  6. K1LKP

    K1LKP Premium Subscriber QRZ Page


    CHECK OUT THIS PAGE..............

  7. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

    The ultimate SuperPRO conversion is to make it all solid-state.:)
  8. AB1ZK

    AB1ZK Ham Member QRZ Page


    Do you have any solid state circuit idea's for the conversion?

  9. KA0HCP

    KA0HCP XML Subscriber QRZ Page

    1. Remove SP400 innards
    2. Bolt IC-7300 to SP400 interior faceplate.
    3. Conversion complete.

    Why? Enjoy the old radios for what they are, rather than destructively turning them into frankensteins... :) bill
    K1APJ, WQ4G and N2EY like this.
  10. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page


    What I'd do is get a Drake R-7, then strip out everything inside the SuperPRO and install the R7 inside, but using the original SuperPRO knob to keep it authentic.:)
    WQ4G likes this.

Share This Page