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Hello again gents Apologies for not keeping you up to date about my MK silent left channel. My friend researched some replacement data sheets for me and recommended the following replacements: Even replacing all these caused TR9 and 10 to blow again. 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. I removed the top cover and discovered one of the sand filled?

I’m new here but I have been a Quad solid state user for many 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.

Silicon PNP Power Transistors

Where else can I look or measure, please? Thank you and best regards to all assisting me here. Joost’s recommendations to use a Variac when testing ‘s is good advice as one can bring the voltage up slowly.


So you will need to replace there, with MJ Could you please be so kind as to instruct an old dufus where to look or what to replace? The same local ZAR source was supposed to get back to me about replacements for the ‘s bd24 the 7th October but she never did.

Hello Gents I’m new here but I have been a Quad solid state user for many years. The amplifier is well-ventilated with nothing on top. Some 2N’s and BDC’s arrived today and I worked slowly and carefully, removing the old and replacing them with the new. 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 3A fuse which also blew immediately.

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New Blog articles Sep Esmond made new posts. At the time, I also replaced some smaller capacitors where I could reach those. What could have gone wrong? I’ll have a look and do some measuring. I have been unwell for many days with all dataaheet of flu nasties.


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. The same thing happened – the same fuse blew again.

New repainted Quad chassis-parts are available Aug See http: Well I didn’t mean to imply you did it personally, but it has undoubtedly happened somehow.

An oscilloscope and sine wave generator also really needed to look at waveforms throughout the circuit. Enter Word Verification in box below. I had a similar problem on datasgeet earlier in the year it took a fair amount of time to fix. Eventually the fault was traced to R8 being open circuit thus putting an incorrect voltage on IC1.

I have to buy some 4A fuses today and will post here re the diagnosis.

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. Btw, I don’t think I have blown components.