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Enter Word Verification in box below. The amplifier is well-ventilated with nothing on top. The same thing happened – the same fuse blew again.

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 is playing. I’ll have a look and do some measuring. Whereas amplifiers like the are AC coupled the being DC coupled can be much more difficult to repair. What could have gone wrong?

Btw, I don’t think I have blown components. 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. Even replacing all these caused TR9 and 10 to blow again. I have a variac and your recommendation to to look at R8 is very useful.

I also gave the source the alternative 2SA but she says these items are ‘very old’. I removed datashdet top cover and discovered one of the sand filled? I am a phono cartridge maker and don’t know too much about amplifier electronics but I can datazheet myself in a basic way.


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. Some 2N’s and BDC’s arrived today and I worked slowly and carefully, removing the old and replacing them with the new. Hello Gents I’m new here but I have been a Quad solid state user for many years. Could you please be so kind as to instruct an old dufus where to look or what to replace? I’m new here but I have been a Quad solid state user for many years.

Search Results for BD242 : 4 documents found

Apologies for not keeping you up to date about my MK silent left channel. Eventually b2d42 fault was traced to R8 being open circuit thus putting an incorrect voltage on IC1.

I have been unwell for many days with all kinds of flu nasties. Check with a multimeter across collector the case and the emitter pin.

I had a similar problem on a earlier in the year it took a fair amount of time to fix. My friend researched some replacement data sheets for me and recommended the following replacements: Well I didn’t mean to imply you did it personally, but it has undoubtedly happened somehow. All the High-end boards for Quad and are available again as well as the High-end revisio.

So you will need to replace there, with MJ The reason being that I now live alone in a dafasheet house after the death of my wife in January this year and I leave the system switched on due to previous house robberies here, hoping the system’s dahasheet will deter more break-ins at my house. Thank you Mr Pye. An oscilloscope and sine wave generator also really needed to look at waveforms throughout the circuit. Thank you and best regards to all assisting me here.


BD242 Datasheet

Hello again gents Apologies for not keeping you up to date about my MK silent left channel. But the next question is why?

Is there perhaps another alternative I can use as replacement for or 2SA? New Blog articles Sep Esmond made new posts.

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. I then replaced the 4A fuse which kept blowing, connected the to its pre and switched on.

BD Datasheet(PDF) – Inchange Semiconductor Company Limited

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. My problem happened 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. Dada’s service information on this site will give you typical voltages to check.

I have to buy some 4A fuses today and will post here re the diagnosis. Apologies for asking for some assistance in my very first post.

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