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Sorry so long but I found this real interesting and educational for me. Below is the block diagram for this.

Thanks for the replies. Oilmaster, I saw that SC you posted. Top grouping is the left transistor and bottom is the right. Recapped the whole thing, sounds much better and a microvolt or two of DC at the datasneet.

2SC Datasheet(PDF) – List of Unclassifed Manufacturers

So, what would datadheet the best route to go? Your name or email address: 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. Waiting for it to come in the mail and may be a future topic here. First pair of preamp transistors voltages were good but the second pair were way off, right channel datasneet of course.


Oh, and I would obviously replace the pair.

Sounded horrible and right channel weaker than the left. 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.

2SC Datasheet PDF –

Cleaned all the pots and switches, still lots of static. I assume its a Hitachi, can’t find anything on the interweb on it. 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 Desoldered the good side dstasheet and it had an hFE of almost No, create an account now.

If you have ksc – it does better in this respect. Assuming this is a good replacement, I guess 2sc9104 guy could bend the leads and squirrel it in. How does RF play into this? Ironically, I just bought a Tek that is not working as well.

9014 Datasheet, Equivalent, Cross Reference Search

It’s capacity is also low 2. The Q is part of the pre-amp, correct? The only downside of the ksc is that its saturation voltage is relatively high. After some assistance getting that fixed, my audio hobby was off and running!


The schematic shows it like this with the voltages: Lots of DC at the speaker outputs, started testing caps, almost all out of specs and many dead. Went through the block diagram in the manual and figgered it had to be one of 2sd9014 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 SS looks good as a replacement. The weak transistor has the legs blackened on it so it musta got hot but not hot enough to kill it?

The “6” can refer to even narrower Hfe ranking by the factory. But if the lower bandwidth would have been acceptable for the circuit, datazheet the equipment manufacturer would have put it!