Correct me if I am wrong. R31 measured 1.7K while its marking bands read 220R (Red Red Black Black)? If yes it would be very odd. Generally metal film resistors do not get made that much outside their marked value. The R31/32 will not get in the way of changing the offset but with such a high value it should cause VAS bias related issues which I think happened in your case.The board is damaged and I have to make a new one. The problem was that was not increasing bias... I changed everything but nothing happened. The offset reset normally and the only difference in the measurements with the other board was that r31 r31 had 1.7k...... in the good only 0.2k. I also can't measure mV in the resistances you give in the instructions. I will need a new board immediately...
I do have some boards left. I will PM you shortly.
I changed all the 5551 and the problem was solved@nanakos What was the issue? Might help other builds trouble-shoot their problems.
Thanks @Vunce . I’ll post the internal pics soon. Been busy with work but l did make some time to give it a serious listen and the amp is simply fantastic. From the day 1 to day 2 the amp is settling down quite nicely and I think another couple of more hours and should be able to hear the best out of these. Getting more musical 🎵Beautiful looking V5, Som!
Can you post a pic of the inside?
Linear or SMPS?
Waiting for the next GB from Ostripper for spooky and hell raiser 😀
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Were the 5551's that were removed from amp purchased from a reputable supplier? (Mouser, DK, RS, etc..)I changed all the 5551 and the problem was solved
large...4kgr per channel...rev4 was ok with these.Nanakos, about the heatsink, what did you choose?
Simply changed the boards...
Keen to know what was the difference like. I have currently biased it to 150ma like Shaan suggested in his build guide. Will bump it up over the weekend. I have big heat sinks too so heat should not be problem.View attachment 1183114
View attachment 1183115
Bias at 300mA and!!!
OMG
Sound from another planet....
Shaan this time exceeded all expectations
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