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Search Results for BD242 : 4 documents found

Is there perhaps another alternative I can use datashert replacement for or 2SA? Enter Word Verification in box below.

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 also gave the source the alternative 2SA but she says these items are ‘very old’. The amplifier is well-ventilated with nothing on top.

BD Datasheet(PDF) – Boca Semiconductor Corporation

Joost’s recommendations to use a Variac when testing ‘s is good advice as one can bring the voltage up slowly. 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 have a variac and your recommendation to to look at R8 is very useful.

Btw, I don’t think I have blown components. What could have gone wrong? I have been unwell for many days with all kinds of flu nasties. Some 2N’s and BDC’s arrived today and I worked slowly and carefully, removing the old and replacing them datashwet the new. I’m new here but I have been a Quad solid state user for many years.


Hello again gents Apologies for not keeping you up to date about my MK silent left channel. Hello Gents 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. After looking carefully, I can see no other overheated part or burnt wire anywhere. The same thing happened – the same fuse blew again.

BDA, BDA, | 4 数据手册, 部分 ::

Where else can I look or measure, please? 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: An oscilloscope and sine wave generator also really needed to look at waveforms throughout the circuit. New repainted Quad chassis-parts are available Aug See http: Could you please be so kind as to instruct an old dufus where to look or what to replace?

I then replaced the 4A fuse which kept blowing, connected datasheer to its pre and switched on. Eventually the fault was traced to R8 being open circuit thus putting an incorrect voltage on IC1.

I removed the top cover and discovered one of the sand filled? I’ll have a look and do some measuring. Thank you and best regards to all assisting me here. Thank you Mr Pye. I see that EJP has already replied, but there’s a useful list of adtasheet equivalents if you click the FAQ’s at the top of the page.


I am a phono cartridge maker and don’t know too much about amplifier electronics but I can help myself in a basic way. Whereas amplifiers like the are AC coupled the being DC coupled can be much more difficult to repair.

Apologies for asking for some assistance in my very first post. So you will need to replace there, with MJ 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.

Check with a multimeter across collector the case and the emitter pin. I had a similar problem on a earlier in the year it took a fair amount of time to fix. Dada’s service information on this site will give you typical voltages to check.

BD242 Datasheet, Equivalent, Cross Reference Search

Even replacing all these caused TR9 and 10 to blow again. At the time, I also replaced some smaller capacitors where I could reach those. Well I didn’t mean to imply you did it personally, but it has undoubtedly happened somehow.

New Blog articles Sep Esmond datqsheet new posts. But the next question is why? 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.