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USHA 2SC Datasheet.

Just remember, the collector and datashest need to be crossed to match the original configuration. Discussion in ‘ Solid State ‘ started by tbone8Nov 23, Sorry so long but I found this real interesting and educational for me.

Below are screen captures of the DCA pro traces. Oh, and I would obviously replace the pair. Below is the block diagram for this.

Looking at the zoomed circuit image at the beginning, that’s a Baxandal tone control circuit at the left alright.

Very interesting, lots of pics, weak transistor

The schematic shows it like this with the voltages: But if the lower bandwidth would have been acceptable for the circuit, then the equipment manufacturer would have put it! The transistor in question is 2ec9014 HITC6.


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. The pinout is different from the original to the SS but I could just put some insulators on the legs and make it fit?

Sounded horrible and right channel weaker than the left.

OilmasterNov 24, Share This Page Tweet. Did a couple comparison test graphs.

That might very well be critical in this circuit, and therefore also stick with a SS sub. Didn’t work, had a bad cap and bad transistor. Notice the knee in the HFE curves below 2 volts. This circuit runs at very low collector voltage. For all other parameters, the KSC is better. It’s capacity is also low 2. First pair of preamp transistors voltages were good but the second pair were way off, right channel one of course.


I assume its a Hitachi, can’t find anything on the interweb on it.

USHA India LTD – datasheet pdf

Went darasheet the block diagram in the manual and figgered it had to be one of two transistors on the control board. Lots of DC at the speaker outputs, started testing caps, almost all out of specs and many dead. Thanks for the replies.

There are also BCc but are base centered. NAD80Nov 24, Recapped the whole thing, sounds much better and a microvolt or two of DC at the speakers. So I know what I put in. datasheeh

How does RF play into this? Your name or email address: Last but not least Like the Tek scope. You must log in or sign up to reply here. Yes, my password is: The SS looks good as a replacement. So, this is where I need a little help.