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palomar 225 blue face

Discussion in 'Amplifiers' started by 552fl, Sep 9, 2018.

  1. 552fl

    552fl Active Member

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    I have the older model with the moto-455 in there.. how do you get rid of the dreaded long sideband delay?? what do you remove for am only? pictures please...cant find any pictures on what to cut or remove...


     

  2. Ranch55

    Ranch55 Well-Known Member

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    Is this it ?

    [​IMG]
     
  3. 552fl

    552fl Active Member

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    Mine looks older has palomar 225 on the bottom that's it,,,has the mrf455 in it...does your has the delay in it too?i think mine was the fist ones that came out..
     
  4. TheRealPorkchop

    TheRealPorkchop Certified Sith Pimp

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    I believe there’s a 33uf capacitor near the input of that amp. Cut it out to remove the delay completely or lower the value to keep the delay but shorten it.

    I’ve chopped a bunch of them out. No pics, sorry.
     
  5. 552fl

    552fl Active Member

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    can you see it marked 33uf on the capacitor? input? where the ant comes in or the power?
     
  6. 552fl

    552fl Active Member

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    is it square or round ? what color if you can remember,thank you very much its driving me crazy,,
     
  7. Dmans

    Dmans Well-Known Member

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    Can't you just leave the delay switch in the AM mode?
     
  8. 552fl

    552fl Active Member

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    theres no sideband switch,,,,automatic sideband
     
  9. Dmans

    Dmans Well-Known Member

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    Didn't know that about this amp. The capacitor should be part of the RF sensing keying circuit. Without a schematic it's hard to say what value the cap is or where it is located exactly in the circuit.

    73's
    David
     
  10. TheRealPorkchop

    TheRealPorkchop Certified Sith Pimp

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    It’ll have 33uf on it, I believe 16v but I can’t remember. It is round.
     
  11. 552fl

    552fl Active Member

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    I will look for it right now,,
     
  12. 552fl

    552fl Active Member

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    front or back of the box
     
  13. 552fl

    552fl Active Member

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    Found a small cylinder capacitor with 35 v33 UF on it right in front of a little aluminum coil looking Thing.. that must be it??
     
  14. TheRealPorkchop

    TheRealPorkchop Certified Sith Pimp

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    Can you take a picture of the inside and post it? I really can’t remember, I’ve done a bunch of them but I’m old now and my mind is slipping.
     
  15. nomadradio

    nomadradio Analog Retentive

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    I remember a large cap in parallel with the relay coil. Either a 220uf or 1000uf. Can't put my hands on a diagram.

    I do remember that one of the mid-1990s models would chatter the relay when this big one was simply removed. Needed a smaller cap, like 47uf to prevent AM chatter on the contacts.

    Been too long. Definitely before we had digital photography here.

    And clipping just one lead of that cap, to add a switch in series with the clipped lead made the delay switchable.

    73
     

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