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Old 7th October 2002, 04:22 AM   #41
NickC is offline NickC
diyAudio Member
Join Date: Dec 2001
Location: Earth
check the devices for counterfeit, mine where and this was one of the cause of the blowing of fuses
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Old 7th October 2002, 05:53 AM   #42
sangram is offline sangram  India
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Join Date: Sep 2002
Location: India
Originally posted by Jean
<snip>I am thinking maybe tip2955/tip3055 keeps failing on turn on every time? My rail voltage is 36 volts, I remember reading with over 35Volts tip2955/tip3055 is not recommended.
Hello, I thought the output transistors were something different? Well, that is definitely a possibility. Remember your rail voltage is actually 72 volts, not 36. AFAIK TIP 3055/2955 have a Vcc max of 70 volts. Bad news, could be the cause.

I suggest before putting in the output transistors check the biasing voltages again. I would still look for Q9 and Q4 to be defective under loaded conditions.

Edit: Also check your input BC546 transistors, all three of 'em. If R6 has no current through it (therefore, 0 volts drop), maybe one of the input transistors isn't conducting properly. A little bit of DC in the input can cause one of these to implode...
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