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Old 12th December 2012, 09:54 AM   #31
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Join Date: Jul 2005
Location: D-55629 Schwarzerden
As I know, the 405 consists of two amps:
1) the single ended pure class-A power buffer for low levels with passive resistor load R30/31+Tr7 - no ccs in the neg. half (speakers runs about serial resistor R38, 18-47 ohms)
2) the push pull power class-B buffer - Tr9+Sziklai darl for neg half Tr8/10
By service I check always at first step only the single ended amp for a longer time and in the second step the whole circuit.
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