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The amplifier is well-ventilated with nothing on top. 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.

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.

I am a phono cartridge maker and don’t know too much about amplifier electronics but I can help myself in a basic way. Check with a multimeter across collector the case and the emitter pin. Where datasheeet can I look or measure, datasheef

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Whereas amplifiers like the are AC coupled the being DC coupled can be much more difficult to repair. I then replaced the 4A fuse which kept blowing, connected the to its pre and switched on. 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 local Datashwet source was supposed to get back to me about replacements for the ‘s since the 7th October but she never did. New repainted Quad chassis-parts are available Aug See http: But the next question is why? Eventually the fault was traced to R8 being dataheet circuit thus putting an incorrect voltage on IC1. Joost’s recommendations to use a Variac when datasueet ‘s is good advice as one can bring the voltage up slowly.


Thank you Mr Pye. 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. At the time, I also replaced some smaller capacitors where I could reach those. datwsheet

Power Innovations

After looking carefully, I can see no other overheated part or burnt wire anywhere. There are no dry joints – I’m an experienced solderer dahasheet can replace or repair things I can SEE are faulty but know zero about electronic troubleshooting. I’ll have a look and do some measuring.

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Power Innovations – datasheet pdf

I have been unwell for many days with all kinds of flu nasties. 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.

My friend researched some replacement data sheets for me and recommended the following replacements: 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’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? 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. Is there perhaps another alternative I can use as replacement for or 2SA? I removed the top cover and discovered one of the sand filled? All the High-end boards for Quad and are available again as well as the High-end revisio.


I have a variac and your recommendation to to look at R8 is very useful. What could have gone wrong? Apologies for asking for some assistance in my very first post. An oscilloscope and sine wave generator also really needed to look at waveforms throughout the circuit. I also gave the source the alternative 2SA but she says these items are ‘very old’.

I have to buy some 4A fuses today and will post here re the diagnosis. Btw, I don’t think I have blown components. Hello Gents I’m new here but I have been a Quad solid state user for many years. Dada’s service information on this site will give you typical voltages to check. I had a similar problem on a earlier in the year it took a fair amount of time to fix.

Some 2N’s and BDC’s arrived today and I worked slowly and carefully, removing the old and replacing them with the new. Hello again gents Apologies for not keeping you up to date about my MK silent datasheett channel.

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Apologies for not keeping you up to date about my MK silent left channel. Which of his recommendations are first choice, if any? So you will need to replace there, with MJ Well I didn’t mean to imply you did it personally, but it has undoubtedly happened somehow.