Quote: Originally Posted by arie123 I replaced all wires indicated by the yellow arrows in Ogygia's picture of the amp by copper/silver teflon coated flexible wire. Unfortunately: no effect. Moving around the wires at various places does nothing to the hum level. It was worth the try...

Quote: Originally Posted by arie123 I replaced the wire that connect the ouput cap to the headphone socket board. That wire is parallel to two 130V wires for centimeters, so I decided to reroute that. Alas, that gives no reduction of hum. I'm starting to lose my patience with this...

Quote: Originally Posted by AntiGeek What are you going to do about the buzzing problem on the 332s Yuking? Just redesign it....recable it...I noticed the problem once I saw the interior.... I dun think it was designed by anyone who knows HIFI at the beginning......Darkvoice is...

Quote: Originally Posted by BigTony Looking at the above you'd expect the hum to be an issue in both channels, whilst its only in one channel (left) on my amp. they a asymmatric and handcrafted...one more facter....your system is not sensitive enough to listen the hum does the...

Whatever....the design and some important materials used in 3322 is better than 332s. The materials like vishay resisters and mkp capaciters. 332s get better in neutrick phone jac and cmc rac....

Quote: Originally Posted by arie123 Ogygia: I should have added that I DO appreciate your suggestions. If it indeed proves to be the crossing of the input signal cable over power wires, solving the problem at the source is indeed by far the most elegant solution. It will need quite some...

Quote: Originally Posted by BigTony I really like the Mullard 8100 (CV4010) tubes, lots of nice rich tone. good for Jazz! male voice!

Is there anyone can recable the signal input connection of 332s? Trying to make it not crossing over the power wire and stick to the case. I think it is the best solution, since someone proved my power off test already...The noise may come from power. Adding capacitor will have unknown effect...

Quote: Originally Posted by gbacic They don't use top quality tube sockets or caps in their amps. So if you upgrade those (as I intend to eventually) the hum should disappear or lessen. So...from what you say, many tube amp should have hum....right? they are not using M-cap or...

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Quote: Originally Posted by BigTony The hum is very quiet, and as soon as the power is turned off the hum dissappears, and as soon as the power is turned on the hum returns. Sorry for that....My guess may right, so no matter how you all burn in your amp...hum will be still there...

anyone conduct my test?

For the hum.............I think of one way to test it! you all can try to switch off the power of 332s and keep the music playing! Since those caps is discharging and the tube is still hot, you all can hear the music for a few sec. But at this moment, the noise of the rippling current from...

Quote: Originally Posted by BigTony Nice photo :-) I replaced all the tubes in the amp with NOS tubes and the humm is still present, however the hum persists when the volume is set to zero (i.e. no music playing). I poped the tubes that came with the amp back in, and the hum is...

Quote: Originally Posted by BigTony Nice photo :-) I replaced all the tubes in the amp with NOS tubes and the humm is still present, however the hum persists when the volume is set to zero (i.e. no music playing). I poped the tubes that came with the amp back in, and the hum is...