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Discussion in ‘ Solid State ‘ started by tbone82sc014 23, datqsheet Log in or Sign up. Very interesting, lots of pics, weak transistor Discussion in ‘ Solid State ‘ started by tbone8Nov 23, Picked up an old GE A a couple months ago. Sounded horrible and right channel weaker than the left.
Cleaned all the pots and switches, still lots of static. Lots of DC at the speaker outputs, started testing caps, almost all out of specs and many dead. Recapped the whole thing, sounds much better and a microvolt or two of DC at the speakers. The right channel was still weaker than the left. Put 1kHz signal through her, signal was clean but 2sc90144 right was half the amplitude of the left channel.
Went through the block diagram in the manual and figgered it had to be one of two transistors on the control board.
First pair of preamp transistors voltages datasheett good but the second pair were way off, right channel one of course. Desoldered the good side one and it had an hFE of almost Did a couple comparison test graphs. Top grouping is the left transistor and bottom is the right. By no means an expert but this don’t look good So, this is where I need a little help. The transistor in question is an HITC6. I assume its a Hitachi, can’t find anything on the interweb on it.
The schematic shows it like this with the voltages: I went 2sx9014 digikey and looked for a hFE TO and the only one that popped up was a SS, oddly enough had the code. The digikey link for it is here https: Assuming this is a good replacement, I guess a guy could bend the leads and squirrel it in. I have a bunch of KSC’s kicking around and wondered if they would work just as well? So, what would be the best route to go?
Sorry so long but I found this real interesting and educational for me. The weak transistor has the legs blackened on it so it musta got hot but not hot daasheet to kill it?
Oh, and I would obviously replace the pair. It probably is a 2SC The “6” can refer to even narrower Hfe ranking by the factory. 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.
Then there is Hfe, bandwidth Ft, capacitance Cob and generated noise; which are either irrelevant or relevant, depending on its very application. 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. I would certainly ensure to have a simular bandwidth. It’s capacity is also low 2.
Last but not least 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.
For all other parameters, the KSC is better. But if the lower bandwidth would have been acceptable for the circuit, then the equipment manufacturer would have put it! So I know what I put in.
That might very well be critical in this circuit, and therefore also stick with a SS sub. OilmasterNov 24, The SS looks good as a replacement. Like the Tek scope. NAD80Nov 24, Thanks for the replies. Oilmaster, I saw that SC you posted. Below is the block diagram for this.
The Q is part dahasheet the pre-amp, correct? How does RF play into this? The pinout is different from the original to the SS but I could just put some insulators on the legs and make it fit?
NAD80, I got that scope about 3 years ago locally from craigslist. Didn’t work, had a bad cap and bad transistor. Datashewt some assistance getting that fixed, my audio hobby was off and running!
Ironically, I just bought a Tek that is not working as well.
Waiting for it to come in the mail and may be a future topic here. I see now that it is indeed the pre-amp section. Looking at the zoomed circuit image at the beginning, that’s a Baxandal tone control circuit at the left alright. So KSC should be good enough. Makes your life easier as well regarding legs Hfe is not much of issue here as long as it is above datawheet, as 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.
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.
This circuit runs at very low collector voltage. The only downside of the ksc is that its saturation voltage is relatively high. Notice the knee in the HFE curves below 2 volts.
If you datasheeh ksc – it does better in this respect.
There are also BCc but are base centered. I only bring this up, as there was a Sansui thread where the signal had reduced level on one side, and was cured by changing the c to c Just remember, the collector and base need to be crossed to match the original configuration.
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