Here is a pinout diagram for the NTE1282, which may help you...Product Comments:
NTE LINEAR INTERGRATED CIRCUIT
526-NTE1282, a Sip-10 Audio Power Amplifier, has been
discontinued by NTE and when stock has been depleted it
will no longer be available.
Currently there is not a cataloged replacement available.
Please contact your Tech Sales representative for
Yeah -- I realize that the STK0039 is available -- My posting of the NTE1282 data was as a means of giving you some approximate (or possibly equivalent) information for the STK0039, as the NTE device is supposed to be an exact replacement...blight said:ChrisP: I do not need a replacement for the STK0039 - i have found a shop selling exactly these parts - it's just nice to have the datasheets to check things or try understanding them at least a bit (I am a electronics noob)
The 'DC chain' is everything which is DC coupled, in this particular amplifier it's everything after the 2.2uF capacitor on the input pin. So you should change all seven of the transistors (assuming your one has seven), any of these faulty (or intermittent) are likely to blow the output chip.blight said:can you tell me what is the "DC chain"? is it the part of the circuit where "one half" of the A/C signal is amplified? (like the upper half of the circuit above)
Ceramic capcitors are usually very reliable, it's quite rare to find a faulty one.blight said:Do ceramic capacitors change their look when they're damaged? Or do they usually not get damaged and not cause transistors to go crazy?
edit: ok... i checked the damaged STK0039's again (i have 3 now )
the one which was damaged when i got the amp has pins 2 and 3 S/C, the two new ones (i also replaced the one which was still ok) now have pins 8 and 9 S/C ... does this mean it could only be a transistor connected to both inputs like the first after "input" in the circuit above? (i have only checked the price for one of the transistor, 2SA798 - dual low noise PNP transistor or something, it's 4 EUR where i have found it so i don't wanna replace all if not neccessary
I've been doing repairs professionally for over 32 years, we ALWAYS replace all transistors in the DC chain - it prevents the repair bouncing back.blight said:So what now? replace all 10 transistors or try finding damaged ones?
It should be fine, unless a specific application picks a transistor for a perculiar characteristic they are fairly interchangable.blight said:one more question: is it safe to use different parts (which are listed on some site to be replacements for the original ones) or should one try to find original parts?
I am looking for 2SC1885 transistor :shock: