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Biasing Blakstar HT5R

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  • #31
    Hey guys. This amp is in again. Not sure if same issue. However this is an HT5-C. The BMP amps link no longer works. Would someone pls share the schematic if you have it? Thanks!
    Last edited by lowell; 02-02-2018, 07:05 PM.

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    • #32
      Here's a couple. If one of them matches the C, let us know which one it is.
      Attached Files
      Originally posted by Enzo
      I have a sign in my shop that says, "Never think up reasons not to check something."


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      • #33
        I noticed that one of the schematics I have has a note from Nick attached to some part of the bias procedure.
        Attached Files
        When the going gets weird... The weird turn pro!

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        • #34
          Originally posted by DrGonz78 View Post
          I noticed that one of the schematics I have has a note from Nick attached to some part of the bias procedure.
          You are welcome
          Experience is something you get, just after you really needed it.

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          • #35
            It's quite odd. There is no CON1 in this amp. The power tube socket is soldered to the main pcb. So in these schematics... you can see 0v noted between R32/34. But it isn't a ground. This is also the cathode so I'm assuming it SHOULD have a ground/common sign there. I do not get continuity from that point to ground.

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            • #36
              Here we go again with 'ground'.

              Look at this schematic crop.
              HT 5 Zero Volts.pdf

              Chassis Ground is connected to Circuit Zero Volts through this circuit.

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              • #37
                Yeah I know. Sorry for the incorrect semantics. Regardless...I cannot find R32/34 33k bias resistors. And none of the resistors in that area have continuity to the cathode resistor and diode 0v point. I think they changed some of the resistor values and the general bias arrangement on this one.

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                • #38
                  If you had a pic of the positive lead placement that would be super awesome! I am doing a first time re-tube of a HT5 Metal and need to bias with smoking the amp or myself! Thank you in advance for all the help thusfar!

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