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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. I then replaced the 4A fuse which kept blowing, connected the to its pre and switched on.

I have to buy some 4A fuses today and will post here re the diagnosis. I’m new here but I have been a Quad solid state user for many years.

Eventually the fault was traced to R8 being open circuit thus putting an incorrect voltage datassheet IC1. An oscilloscope and sine wave generator also really needed to look at waveforms throughout the circuit. So you will need to replace there, with MJ 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.

New repainted Quad chassis-parts are available Aug See http: What could have gone wrong? But the next question is why? 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. Whereas amplifiers like the are AC coupled the being DC coupled can be much more difficult datasjeet repair.

  EN 50147-1 PDF

New Blog articles Sep Esmond made new posts. I have a variac and your recommendation to to look at R8 is very useful. I removed the top cover and discovered one of the sand filled?

Datasheet download …

Check with a multimeter across collector the case and the emitter pin. Which of his recommendations are first choice, if any?

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

I’ll have a look and do some measuring. At the time, I also replaced some smaller capacitors where I could reach those. Apologies for asking for some assistance in my very first post.

Datasheets history of inquiries : Datasheets for Electronic Components and Semiconductors

I also gave the source the alternative 2SA but she says these items are ‘very old’. Hello again gents Apologies for not keeping you up to date about my MK silent left channel. Could you please be so kind as to instruct an old dufus where to look or what to replace? Where else can I look or measure, bd24 After looking carefully, I can see no other overheated part or burnt wire anywhere.


Silicon PNP Power Transistors

Apologies for not keeping you up to date about my MK silent left channel. My friend researched some replacement data sheets for datasheef and recommended the following replacements: Dada’s service information on this site will give you typical voltages to check. I did not have a replacement 4A fuse in stock and replaced the blown item with a similar sand-filled datxsheet fuse which also blew immediately.

I am a phono cartridge maker and don’t know too much about amplifier electronics but I can help myself in a basic way.

Hello Gents I’m new here but I have been a Quad solid state user for many years. The same thing happened – the same fuse blew 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. All the High-end boards for Quad and are available again as well as the High-end revisio.