Posted by Shropshire Lad (A) on March 25, 2009 at 10:40:27

In Reply to: RE: Bille Trouble posted by bcherry on March 24, 2009 at 05:38:36

Brian,

Just done the measurements as per instruction manual as you requested

Amp 1

Across Driver Tube B7 - B8 - 6.7(5.8)
Across Rectifier A2-A8 - 5.0(4.2)
300b C1-C4 - 5.0(3.6)

Gnd -C2 - 383
Gnd B6 - 1.2
Gnd B2 - 320
Cathode Resistor - 45v

Amp 2

Across Driver Tube B7 - B8 - 6.6(5.8)
Across Rectifier A2-A8 - 5.1(4.1)
300b C1-C4 - 4.8(3.8)

Gnd -C2 - 412
Gnd B6 - 1.3
Gnd B2 - 345
Cathode Resistor - 29v

The numbers in brackets are the same maesurement WITH with GZ34 tube in place, first voltages with rectifier removed. Note the vlotage drops with the rectifier in situ and the low voltage across the cathode resistor.

Any clues ?

Thanks

Edits: 03/25/09

• RE: Bille Trouble - bcherry 23:23:00 03/26/09 (0)
  In Reply to: RE: Bille Trouble posted by Shropshire Lad on March 25, 2009 at 10:40:27

  So just installing rectifier loads the voltages down like that?
  And both amps the same effect.
  Can you email me with some history on these amps and primary voltage configuration etc.
  regards
  Brian
  DIY - Done Right!
  
  

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