This may seem even more odd when you realise that both companies are now owned by US distribution group Avnet.
Marketing genuine spares is not straightforward though, when your main clients may require a paper trail of documentation including statements of origin, relevant specifications and revisions with each, likely small transaction. Having worked in a traditional UK company that both manufactured and sourced electrical components for defence, aerospace and high reliability applications, it's easy to see how a $5.00 unit price per 10 each, could blow out to 5 or more times that selling price per 1only.
However, the OP has a choice which should be made now, before someone realises the difference and bumps up their price
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Hi again all, after all of your help I got sorted with the drivers and output transistors. I went for the 2n3773 (generic) which is all I could get my hands on.
anyway, all powered up but having a slight issue with quiescent current across the right channel, by way of being unstable and creeping up and causing cross over distortion. Any ideas guys?
anyway, all powered up but having a slight issue with quiescent current across the right channel, by way of being unstable and creeping up and causing cross over distortion. Any ideas guys?
Hey Huggy, I’ve changed every transistor on this channel as I believe one of the main outputs shorted to base, maybe!!
I think I should of explained better, it’s actually the symmetrical clipping I’m having trouble with. I read somewhere that a good starting point is getting 50% of the voltage at the big output capacitors then putting the scope in. However 50% of this voltage is around 38vdc. If I get anywhere near there on the channel I’ve repaired it goes up into oblivion causing crossover distortion.
feel like I’m getting something wrong. I’m putting a 1k sine wave through the tuner section and measuring waveform at speaker outputs
clipping is close to symmetrical but the voltages seem wrong at the caps and the pots seem to do nothing (new pots)
I think I should of explained better, it’s actually the symmetrical clipping I’m having trouble with. I read somewhere that a good starting point is getting 50% of the voltage at the big output capacitors then putting the scope in. However 50% of this voltage is around 38vdc. If I get anywhere near there on the channel I’ve repaired it goes up into oblivion causing crossover distortion.
feel like I’m getting something wrong. I’m putting a 1k sine wave through the tuner section and measuring waveform at speaker outputs
clipping is close to symmetrical but the voltages seem wrong at the caps and the pots seem to do nothing (new pots)
Got to the bottom of this. The 2 clipping diodes 1N60 diodes I originally replaced with eBay cheapo specials. Turned out these where causing the symmetrical clipping problem. Now replaced with some original and genuine Toshiba 1N60. Amps set up and sounds amazing. Thanks again everyone for all of your help .
There's quite a few threads here that end with the OP realising the 1N60 diodes are fakes. 'sad when we have to join them and go through the same, exasperating trials. Apparently, the substitute is often a small signal Schottky diode that was probably excess stock, so virtually worthless as a discrete component. The usual germanium type specified in the UK, is the ubiquitous IN34A but beware of scalpers trying to charge large sums for 2p cost products like these.