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Hello again gents Apologies for not keeping you up to date about my MK silent left channel. My problem happened to be R8 but my point was that bd2442 component failure in the initial stages could manifest itself with further component failure at the outputs. I had a similar problem on a earlier in the year it took a fair amount bv242 time to fix. 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.
I then replaced the 4A fuse which kept blowing, connected the to its pre and switched on. 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 have been unwell for many days with all kinds of flu nasties. I’m new here but I have been a Quad solid state user for many years.
I have a variac and your recommendation to to look at R8 is very useful. 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. 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. All the High-end boards for Quad and are available again as well as the High-end revisio.
Silicon PNP Power Transistors
The amplifier is well-ventilated with nothing on top. I removed the top cover and discovered one of the sand filled? New Blog articles Sep Esmond made new posts. An oscilloscope and sine wave generator also really needed to look at waveforms datasheet the circuit. I’ll have a look and do some measuring. Some 2N’s and BDC’s arrived today and Datashheet worked slowly and carefully, removing the old and replacing them with the new.
Thank you Mr Pye. 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. Well I datasgeet mean to imply you did it personally, but it has undoubtedly happened somehow.
New repainted Quad chassis-parts are available Aug See http: Btw, I don’t think I have blown components. Eventually the fault was traced to R8 being open circuit thus putting an incorrect voltage on IC1.
Apologies for asking for some assistance in my very first post. Could you please be so kind as to instruct an old dufus where to look or what to replace? At the time, I also replaced some smaller capacitors where I could reach those. Dada’s service information on this site will give you typical voltages to check. After looking carefully, I can see no other overheated part or burnt wire anywhere.
Hello Gents I’m new here but I have been a Quad solid state user for many years.
BD Datasheet PDF –
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.
Which datadheet his recommendations are first choice, if any?
My friend researched some replacement data sheets for me and recommended the following replacements: Thank you and best regards to all assisting me here. 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. So you will need to replace there, with MJ Where else can I look or measure, please?
What could have gone wrong? 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. 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.
Check with a multimeter across collector the case and eatasheet emitter pin. Apologies for not keeping you up to date about my MK silent left channel.
BD242 Datasheet PDF – Bourns Electronic
Is there perhaps another alternative I can use as replacement for or 2SA? Joost’s recommendations to use a Variac when testing ‘s is good advice as one can bring the voltage up slowly.
I am a phono cartridge maker and datasjeet know too much about amplifier electronics but I can help myself in a basic way.