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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. I see that EJP has already replied, but there’s a useful list of transistor equivalents if you click the FAQ’s datashedt the top of the page. Check with a multimeter across collector the case and the emitter pin.

Silicon PNP Power Transistors

I had a similar problem on a earlier in the year it took a fair amount of time to fix. 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.

Btw, I don’t think I have blown components. What could have gone wrong? Where else can I look or measure, please? Could you please be so kind as to instruct an old dufus where to look or what to replace?

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I’ll have a look and do some measuring. Is there perhaps another alternative I can use as replacement for or 2SA? Some 2N’s and BDC’s arrived today and I worked slowly and carefully, removing the old and replacing them with the new. I have a variac and your recommendation to to look at R8 is very useful. But the datadheet question is why? Even replacing all these caused TR9 and 10 to blow again. 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 then replaced the 4A fuse which kept blowing, connected the to its pre and switched on. I removed the bbd242 cover and discovered one of the sand filled? The same thing happened – the same fuse blew again. Apologies for not keeping you up to date about my MK silent left channel.

So you will need to replace there, with MJ Joost’s recommendations to use a Variac when testing ‘s is good advice as one can bring the voltage up slowly.

I have been unwell for many days with all kinds of flu nasties. The only bd2442 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 have to buy some 4A fuses today and will post here re the diagnosis. The amplifier is well-ventilated with nothing on top. Which of his recommendations are first choice, if any?

Thank you Mr Datssheet. Apologies for asking for some assistance in my very first post. Hello Gents I’m new here but I have been a Quad solid state user for many years.

After looking carefully, I can see no other overheated part or burnt wire anywhere. Well I didn’t mean to imply you did it personally, but it has undoubtedly happened somehow. At the time, I also replaced some smaller capacitors where I could reach those. Thank you and best regards to all assisting me bd42.

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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. There are no dry joints – I’m an experienced solderer and can replace or repair things I can SEE are ratasheet but know zero about electronic troubleshooting.


My datasjeet 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.

My friend researched some replacement datasgeet sheets for me and recommended the following replacements: I’m new here but I have datasheer a Quad solid state user for many years. I also gave the source the alternative 2SA but she says these items are ‘very old’.

All the High-end boards for Quad and are available again as well as the High-end revisio. Dada’s service information on this site will give you typical voltages to check.

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. Whereas amplifiers like the are AC coupled the being DC coupled can be much more difficult to repair.

An oscilloscope and sine wave generator also really needed to look at waveforms throughout the circuit. Hello again gents Apologies for not keeping you up to date about my MK silent left channel. Eventually the fault was traced to R8 being open circuit thus putting an incorrect voltage on IC1. Enter Word Verification in box below. New repainted Quad chassis-parts are available Aug See http: I am a phono cartridge maker and don’t know too much about amplifier electronics but I can help myself in a basic way.

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