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What could have gone wrong?

BD datasheet & applicatoin notes – Datasheet Archive

Dada’s service information on this site will give you typical voltages to check. Could you please be so kind as to instruct an old dufus where to look or what to replace? An oscilloscope and sine wave generator also really needed to look at waveforms throughout the circuit.

Check with a multimeter across collector the case and the emitter pin. Some 2N’s and BDC’s arrived today and I worked slowly and carefully, removing the old and replacing them with the new.

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I did not have a replacement 4A fuse datadheet stock and replaced the blown item with a similar sand-filled 3A fuse which also blew immediately. I removed the top cover and discovered one of the sand filled?

I have been unwell for many days with all kinds of flu nasties. Apologies for asking for some assistance in my very first post. My friend researched some replacement data sheets for me and recommended the following replacements: Joost’s recommendations to use a Variac when testing ‘s is good advice as one can bring the voltage up slowly.


After looking carefully, I can see no other overheated part or burnt wire anywhere. 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.

Micro Electronics Ltd. – Datasheet

Thank you and best regards to all assisting me here. All the High-end boards for Quad and are available again as well as the High-end revisio. 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.

Dafasheet you will need to replace there, with MJ I’ll have a look and do some measuring. I am a phono cartridge maker and don’t know too much about amplifier electronics but I can help myself in a basic way.

I then replaced the 4A fuse which kept blowing, connected vd242 to its pre and switched on. Hello Gents I’m new here but I have been a Quad solid state user for many years. Apologies for not keeping you up to date about my MK silent left channel. Enter Word Verification in box below. Where else can I look or measure, please?

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. But the next question is why?


BD242 Datasheet PDF – Bourns Electronic

Well I didn’t mean to imply you did it personally, but it has undoubtedly bd2242 somehow. Even replacing all these caused TR9 and 10 to blow again.

New repainted Quad chassis-parts are available Aug See http: Btw, I don’t think I have blown components. 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 also gave the source the alternative 2SA but she says these items are ‘very old’.

I have a variac and your recommendation to to look at R8 is very useful. The reason being that I now live alone in a big 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 sound will deter more break-ins at my house.

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.