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Old 6th July 2009, 02:04 PM   #1
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Default 18 volts on sub preamp

hi everybody in this forum. I was wondering if someone could help me with my problem.I have a STK 300watt powered 15 " PA sub that the preamp transistors have blown up. I was about to replace them and checked the voltage from the power amp side to the preamp and it was 18 volts. is this right? The transformer is a 40-40 volts. The power amp transistors are 2 mjl21193 and 2 mjl21194.
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Old 6th July 2009, 02:47 PM   #2
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Default Re: 18 volts on sub preamp

Quote:
Originally posted by robfrom oz
I was about to replace them and checked the voltage from the power amp side to the preamp and it was 18 volts. is this right? .
Yes...must have a voltage regulator which decreases the supply voltage of Pre-amp.
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