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I’m new here but I have been a Quad solid state user for vatasheet years. 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. An oscilloscope and sine wave generator also really needed to look at waveforms throughout the circuit. Whereas amplifiers like the are AC coupled the being DC coupled can be much more difficult to repair.

BD Datasheet PDF –

I have been unwell for many days with all kinds datasheer flu nasties. I have a variac and your recommendation to to look at R8 is very useful. But the next question is why? What could have gone wrong? New repainted Quad chassis-parts are available Aug See http: I removed the top cover and discovered one of the sand filled?

Which of his recommendations are first choice, if any? Even replacing all these caused TR9 and 10 to blow again. The same thing happened – the same fuse blew again.

Some 2N’s and BDC’s arrived today datasgeet I worked slowly and carefully, removing the old and replacing them with the new. The same local ZAR source was supposed to get back to me about replacements for the ‘s since the dataaheet October but she never did. Joost’s recommendations to use a Variac when testing ‘s is good advice as one can bring the voltage up slowly. Hello Gents I’m new here but I have been a Quad solid state user for many years.


All the High-end boards for Quad and are available again as well as the High-end revisio. I’ll have a look and do some measuring. I then replaced the 4A fuse which kept blowing, connected the to its pre and switched on.

Apologies for not keeping you up to date about my MK silent left channel. 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. Well I didn’t mean to imply you did it personally, but it has undoubtedly happened somehow. After looking carefully, I can see no other overheated part or burnt wire anywhere.

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. So you will need to replace there, with MJ The amplifier is well-ventilated with nothing on top. At the time, I also replaced some smaller capacitors where I could reach those. Is there perhaps another alternative I can use as replacement for or 2SA?

Thank you and best regards to all assisting me here. Where else can I look or measure, please? I also gave the source the alternative 2SA but she says these items are ‘very old’. Btw, I don’t think I have blown components.

Datasheet download …

I am a phono cartridge maker and don’t know too much about amplifier electronics but I can help myself in a basic way. Enter Word Verification in box below. 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. I have to buy some 4A fuses today and will post here re the diagnosis.

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. Thank you Bd2242 Pye. New Blog articles Sep Esmond made new posts.

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.

Dada’s service information on this site will give you typical voltages to check. Check with a multimeter across collector the case and the emitter pin. Apologies for asking for some assistance in my very first post. I had a similar problem on a earlier in the year it took a fair amount bd22 time to fix.

Eventually the fault was traced to R8 being open circuit thus putting an incorrect voltage on IC1. My friend researched some replacement data sheets for me and recommended the following replacements: Could you please be so kind as to instruct an old dufus where to look or what to replace?

Hello again gents Apologies for not keeping you up to date about my MK silent left channel. I see that EJP has already replied, but there’s a useful list of transistor equivalents if you click the Dattasheet at the top of the page.