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I’m new here but I have been a Quad solid state user for many years. Apologies for asking for some assistance in my very first post. I am a phono cartridge maker and don’t know too much about amplifier electronics but I can help myself in a basic way.
At the time, I also replaced some smaller capacitors where I could reach those. 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 removed the top cover and discovered one of the sand filled? After looking carefully, I can see no other overheated part or burnt wire anywhere. 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. The amplifier is well-ventilated with nothing on top. 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. 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.
I had a similar problem on a earlier in the year it took a fair amount of time to fix. Whereas amplifiers like the are AC coupled the being DC coupled can be much more difficult to repair. Even replacing all these caused TR9 and 10 to blow again.
Eventually the fault was traced to R8 being open circuit thus putting an incorrect voltage on IC1.
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Joost’s recommendations to use a Variac when testing ‘s is good advice as one can bring the voltage up slowly.
An oscilloscope and sine wave generator also really needed to look at waveforms throughout the circuit. 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. 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 friend researched some replacement data sheets for me and recommended the following replacements: Datashert 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.
Apologies for not keeping you up to date about my MK silent left channel.
I have been unwell for many days with all kinds of flu nasties. 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. There are no dry joints – I’m an datasheef solderer and can replace or repair things I can SEE are faulty but know zero about electronic datasehet.
New Blog articles Sep Esmond made new posts. New repainted Quad chassis-parts are available Aug See http: Enter Word Verification in box below. What could have gone wrong? Could you please be so kind as to instruct an old dufus dataheet to look or what to replace?
Check with a multimeter across collector the case and the emitter pin.
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So you will need to replace there, with MJ But the next question is why? I’ll have a look and do some measuring. I have a variac and your recommendation to to look at R8 is very useful.
I have to buy some 4A fuses today and will post here re the diagnosis. Which of his recommendations are first choice, if any? I also gave the source the alternative 2SA but she says these items are ‘very old’. Is there perhaps another alternative I can use as replacement for or 2SA? Thank you and best regards to all datssheet me here.
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I then replaced the 4A fuse which kept blowing, connected the to its pre and switched on. The same thing happened – the same fuse blew again.
Where else dstasheet I look or measure, please?
Hello Gents I’m new here but I have been a Quad solid state user for many years. Thank you Mr Pye. Well I didn’t mean to imply you did it personally, but it daatsheet undoubtedly happened somehow. Hello again gents Apologies for not keeping you up to date about my MK silent left channel.