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Later i replaced the burned pair but loaded it with a series bulb, it lighted up well, but when i checked the reference voltage points given on PCB it measured mV whereas on other channels it was 1 mv, so turned bias down now its not heating and not drawing much current. BTW i have heard 2sc is way too linear.
Your replacement transistors have different characteristics so you will need to readjust bias. Bias adjustment is done via the bias adjustment pot, obviously. Can you see where the bias test points connect to? Typically you'd measure about 12 mV across one or 24 mV across both emitter resistors. Most anything unusually cheap and branded "Toshiba" is probably a fake, since these types were discontinued by Toshiba years ago.
Do check the bias pots for contact issues typically evidenced by bias current being jumpy during adjustment and clean them if necessary.
Find More Posts by sgrossklass. Originally Posted by Tekko. Originally Posted by muddasirwaheedmalik. They are intended for higher voltage operation and thus lower current handling. It is possible the output stage is oscillating with RF and creating excess noise and heat. You may need to add a resistor in series with the base to dampen it, like 1RR. Need a scope to verify stability.
BB code is On. Smilies are On. Forum Rules. All times are GMT. The time now is AM. Resources saved on this page: MySQL User Name. Stay logged in? Mark Forums Read. Solid State Talk all about solid state amplification. Please consider donating to help us continue to serve you. Thread Tools. View Public Profile. Send a private message to muddasirwaheedmalik. Find More Posts by muddasirwaheedmalik. Find More Posts by Tekko. Send a private message to sgrossklass. Send a private message to Coconuts Find More Posts by Coconuts Quote: Originally Posted by Tekko Your replacement transistors have different characteristics so you will need to readjust bias.
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Replacing a standard output transistor with a Darlington. Frequently Asked Questions Did you forget your password?
TIP36C Transistors. Datasheet pdf. Equivalent