In Reply to: DAC offset on ma-1 posted by ChasLieb on November 18, 2014 at 19:52:28:
This is for the MA50 and 60, but is applicable. What you want is two from the positive phase and two from the negative.
"Statistical Swap: This procedure is the remedy for a DC offset which cannot be zeroed
(see DC offset procedure). Using a potholder or similar object, randomly remove two
tubes from the front bank of output tubes and exchange them for two tubes from the
rear output tube bank. Perform the DC offset adjustment and note the improvement. If
the situation worsened, you may have to perform several random swaps before the proper
balance is achieved. This condition occurs occasionally as the result of variances in
tube production and should in no way be considered a defect of either the amplifier or
the output tube compliment."
Dan Santoni
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Follow Ups
- Found this - - Blackdog 05:41:15 11/19/14 (1)
- RE: Thanks Dan- nt - ChasLieb 18:18:37 11/20/14 (0)