Tweaker's Asylum

• assuming that the cathode resistor on your right-channel - Quest 22:31:11 03/20/02 (1)
  In Reply to: red hot plates! help! posted by bobsmog on March 20, 2002 at 20:02:47:

  value isn't way off (it shouldn't be under normal circumstances), then chances are you are having DC into your power tubes. Check your coupling caps for DC leakage and replace them if necessary.

  Q.
  
  

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  • Yeah, didn't think of that. - Poindexter 10:35:04 03/21/02 (0)
    In Reply to: assuming that the cathode resistor on your right-channel posted by Quest on March 20, 2002 at 22:31:11:

    Thanx, Q. Good call.
    
    

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• Check the cathode resistor. - Poindexter 22:26:23 03/20/02 (0)
  In Reply to: red hot plates! help! posted by bobsmog on March 20, 2002 at 20:02:47:

  They're not foolproof; they can change value, or fail short. There's nothing in parallel with a cathode resistor, so you can check with a DVM with the set unplugged, and compare its resistance with the color bands and the resistance of the other channel (which is not glowing; right?).

  Another check is to power up on the bench, and hold your hot probe on the suspect cathode(s) - it (they) should hold at about 20Vdc in operation, give or take.

  Another possibility; is there a capacitor bypass for this resistor? Check its DC resistance (should start low, and climb to open).

  This is a fairly simple problem, at a glance. The cathode resistor, or its bypass cap has to be at fault. I think.

  You can post me at:

  poinxie 'at' yahoo.com (addy cleverly disguised)

  if none of this works.

  Poinz
  
  

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• Post in tubes! Have you checked the bias? - Tromatic 20:26:06 03/20/02 (0)
  In Reply to: red hot plates! help! posted by bobsmog on March 20, 2002 at 20:02:47:

  You may have blown a resister in the bias circuit. DO NOT use this thing until you find out what's up!
  Matthew
  
  

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