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What could have gone wrong? I also gave the source the alternative 2SA but she says these items are ‘very old’.

The same local ZAR source was supposed to get back to me about replacements for the ‘s since the 7th October but she never did.

The same thing happened – the same fuse blew again. I had a similar problem on a earlier in the year it took a fair amount of time to fix.

Btw, I don’t think I have blown components. Dada’s service information on this site will give you typical voltages to check.

Hello dataaheet gents Apologies for dataasheet keeping you up to date about my MK silent left channel. I am a phono cartridge maker and don’t know too much about amplifier electronics but I can help myself in a basic way. Where else can I look or measure, please? New Blog articles Sep Esmond made new datashfet. I see that EJP has already replied, but there’s a useful list of transistor equivalents if you click the FAQ’s at the top of the page.

Well I didn’t mean to imply you did it personally, but it has undoubtedly happened somehow. I did not have a replacement 4A fuse in stock and replaced the blown item with a similar sand-filled 3A fuse which also blew immediately. I’ll have a look and do some measuring.

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BD242 Datasheet PDF – Bourns Electronic

My friend researched some replacement data sheets for me and recommended the following replacements: So you will need to replace there, with MJ But the next question is why?

Eventually the fault was traced to R8 being open circuit thus putting an incorrect voltage on IC1. An oscilloscope and bc242 wave generator also really needed to look at waveforms throughout the circuit. My problem datasgeet to be R8 but my point was that any component failure in the initial stages could manifest itself with further component failure at the outputs.

Check with a multimeter across collector the case and the emitter pin.

BD datasheet & applicatoin notes – Datasheet Archive

The amplifier is well-ventilated with nothing on top. There are no dry joints – I’m an experienced solderer and can replace or repair things I can SEE are faulty but know zero about electronic troubleshooting. All the High-end boards for Quad and are available again as well as the High-end revisio. The only unusual thing is the is more or less permanently switched on with the pre-amp’s volume set so low one can barely hear music xatasheet playing.

I removed the top cover and discovered one of the sand filled? At the time, I also replaced some smaller capacitors where I could reach those.


I have to buy some 4A fuses today and will post here re the diagnosis. During the past several years, my worked perfectly without any issues at all until about a week ago when I discovered its left channel had no sound.

I have been unwell for many days with all kinds of flu nasties. After looking carefully, I can see no bd42 overheated part or burnt wire anywhere.

Is there perhaps another alternative I can use as replacement for or 2SA? Whereas amplifiers like the are AC coupled the being DC coupled can be much more datassheet to repair.

Thank you Mr Pye. I’m new here but I have been a Quad solid state user for many years.

BD242 PDF Datasheet浏览和下载

Even replacing all these caused TR9 and 10 to blow again. Enter Word Verification in datashedt below. Thank you and best regards to all assisting me here.

A friend helped me to diagnose the dead channel on my Quad MK1 and the problem was traced to one of the Toshiba 2SD’s. Joost’s recommendations to use a Variac when testing ‘s is good advice as one can bring the voltage up slowly. I have a variac and your recommendation to to look at R8 is very useful.

New repainted Quad chassis-parts are available Aug See http: