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2sc datasheet & applicatoin notes – Datasheet Archive
Oh, and I would obviously replace the pair. Desoldered the good side one and it had an hFE of almost The SS looks good as a replacement. So I know what I put in. Your name or email address: Picked up an old GE A a couple months ago.
Oilmaster, I saw that SC you posted. Assuming this is a good replacement, I guess a guy could bend the leads and squirrel it in.
Cleaned all the pots and switches, still lots of static. I see now that it is indeed the pre-amp section. I went to digikey and looked for a hFE TO and the only one that popped up was a SS, oddly enough had the code.
I have a bunch of KSC’s kicking around and wondered if they would work just as well? Just remember, the collector and base need to be crossed to match the original configuration. It probably is a 2SC NAD80Nov 24, Went through the block diagram in the manual and figgered it had to be one of two transistors on the control board.
Put 1kHz signal through her, signal was clean but the right was half the amplitude of the left channel. The “6” can refer to even narrower Hfe ranking by the factory. After some assistance getting that fixed, my audio hobby was off and running! Datasheef right channel was ratasheet weaker than the left.
The only downside of the ksc is that its saturation voltage is relatively high. Waiting for it to come in the mail and may be a future topic here. For all other parameters, the KSC is better.
Did a couple comparison test graphs. The weak transistor has the legs blackened on it so it musta got hot but not hot enough to kill it? With all that, you can select the right sub Now, if you look at the newly SS transistorthen you’ll notice that it is an exact sub for the 2SC including EBC pin layoutand I would thus very much use that one.
Discussion in ‘ Solid State ‘ started by tbone8Nov 23, By no means an expert but this don’t look good Below is the block diagram for this.
The Q is part of the pre-amp, correct? Yes, my password is: Like the Tek scope. Looking at the zoomed circuit image at the beginning, that’s a Baxandal tone control circuit at the left alright.
Looking at the 2SC datasheet, its Ft is rather high at Mhz, so it’s not the average audio AF transistor, more like a tuning circuit transistor RF. The schematic shows it like this with the voltages: OilmasterNov 24, When subbing transistors, you’ll make sure that the allowable Vce, IC and Pc are safely above in-circuit conditions, and certainly not lower then originally installed unless you can deduct what worst-case in-circuit current can be most often only a few mA runs while the transistor is ranked mA, so a 50mA ranked sub-transistor could do as well.
I assume its a Hitachi, can’t find anything on the interweb on it. How does RF play into this?
Very interesting, lots of pics, weak transistor Discussion in ‘ Solid State ‘ started by tbone8Nov 23, Didn’t work, had a bad cap and bad transistor. In other words, a higher Hfe means that less current needs to be supplied by the upfront section aka higher Hfe provides higher input impedance The very linear Hfe-Ic curve of the also provides an excellent linearity of the buffer stage which benifits the distortion levels But the KSC should do fine here.
Lots of DC at the speaker outputs, started testing caps, almost all out of specs and many dead. Notice the knee in the HFE curves below 2 volts. It’s capacity is also low 2. Log in or Sign up. Thanks for the replies. Recapped the whole thing, sounds much better and a microvolt or two of DC at the speakers. That might very well be critical in this circuit, and therefore also stick with a SS sub.
Makes your life easier as well regarding legs Hfe is not much of issue here as long as it is aboveas this transistor is a “buffer stage” with at max a factor 10 amplification probably less than 5 Higher Hfe can sometimes be desired to “unload” the upfront circuit.
So, this is where I ddatasheet a little help.