Announcement

Collapse
No announcement yet.

Hot Rod deville Bias??

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • g1
    replied
    Originally posted by Helmholtz View Post
    Do you mean CR10/CR15?
    Depends which version of the schematic you are looking at. But they are the same.

    Leave a comment:


  • Chuck H
    replied
    Originally posted by g1 View Post
    The top supply (pg.2 of schems from post #25) is labelled 'HR Deville. It is using the 0041752 xfrmr which is also shown in the snippet Jon posted in post #7, and the schematic that Tom posted.
    I realize that doesn't clarify much but it seems it has been drawn with both the CT connected and not connected.
    Ah! Ok.

    Leave a comment:


  • Chuck H
    replied
    EDIT: Nevermind

    Leave a comment:


  • Helmholtz
    replied
    Do you mean CR10/CR15?

    Leave a comment:


  • g1
    replied
    Originally posted by Chuck H View Post
    Note that the variant schematics are for the Hot Rod Deluxe and the amp in question is the Hot Rod Deville.
    The top supply (pg.2 of schems from post #25) is labelled 'HR Deville. It is using the 0041752 xfrmr which is also shown in the snippet Jon posted in post #7, and the schematic that Tom posted.
    I realize that doesn't clarify much but it seems it has been drawn with both the CT connected and not connected.

    Leave a comment:


  • nosaj
    replied
    Ok here the solution. after i posted I started resistance checks to ground. They were all good. So 24ish volt i was getting was less than half on a voltage doubler. Caps are good diodes are good, but measuring from Anode of D10 to Kathode of D15 was showing 4.5 megs where it should have been .01 or .02 (cause of probe leads). So i jumpered d10 to d15.
    Bam Bias voltage in the park biased up 70 mV played in shed for a bit. Sounds good.
    nosaj

    Leave a comment:


  • Chuck H
    replied
    Note that the variant schematics are for the Hot Rod Deluxe and the amp in question is the Hot Rod Deville. That would explain the component allocation differences. Considering the tests and component allocations so far I think we must be dealing with the schematic Tom posted. But the schems g1 provided do clarify CP16 as a CT I think. Or at least very probable.

    Leave a comment:


  • Helmholtz
    replied
    Originally posted by g1 View Post
    It should work either way, with a few differences.
    Attached is the HR Deluxe III schematics. Pg.2 shows both variants of the supply.
    Yes, but it makes a difference regarding ground return currents and involved components.

    Leave a comment:


  • Chuck H
    replied
    Originally posted by g1 View Post
    Attached is the HR Deluxe III schematics. Pg.2 shows both variants of the supply.
    And both are different from the schematic posted by Tom.?.

    Leave a comment:


  • g1
    replied
    Originally posted by Helmholtz View Post
    One thing is not clear to me from the schematic: Does the bias winding have a (grounded) CT? Where does CP16 connect?
    It should work either way, with a few differences.
    Attached is the HR Deluxe III schematics. Pg.2 shows both variants of the supply.

    Attached Files

    Leave a comment:


  • Chuck H
    replied
    Originally posted by Helmholtz View Post
    Is the +/-16V supply good?

    One thing is not clear to me from the schematic: Does the bias winding have a (grounded) CT? Where does CP16 connect?
    I wondered that too. I even tried to clarify by looking up other versions of the schematic with no luck. If CP16 is a center tap it should be grounded. Since nosaj measured from either end to of the winding to CP16 I do assume it's a center tap.

    Leave a comment:


  • g1
    replied
    Originally posted by nosaj View Post
    What am I missing here A ground connection?
    nosaj
    Cathode end of CR10 should read zero ohms to negative end of C34.

    Leave a comment:


  • Chuck H
    replied
    What do you read for the LV circuit? R78 and R79 where you should have 33.3V (+/- respectively) on one end and 16V (+/- respectively) on the other.
    This might help determne if you have a problem with the voltage doubler circuit or if something may be drawing too much current. Or (not probable but not impossible) if the winding may be compromised.

    Leave a comment:


  • Helmholtz
    replied
    Is the +/-16V supply good?

    One thing is not clear to me from the schematic: Does the bias winding have a (grounded) CT? Where does CP16 connect?

    Leave a comment:


  • nosaj
    replied
    I replaced c43, c37 ,CR10, CR15,
    Bias leads disconnected I am reading btween cp15 and cp17 57.5Vac
    cp15 and cp16 28.61Vac
    cp17 and cp16 28.62

    Bias taps hooked back up I get ...

    CR15 Anode side I am only getting -31.92vdc

    What am I missing here A ground connection?
    nosaj

    Leave a comment:

Working...
X