Hi, Is the background noise still there on this amp? I would like to buy one, but pay for noise, no thanks.

It's the same problem with HA-6A Cayin don't resolve, i've HA-1A MK2 and it zzzzzzzzzzzzzzzz also, louder with some headphones and less loud with others,when I turn it on it's very strong and it decreases little by little, but not completely. You may have a faulty power tube or preamp

are you looking for an OTL amp? I recommend the feliks euforia.

Hi all, I'm glad I didn't buy the HA-6A, I'm very happy with my Feliks Euforia which doesn't make any noise, hiss, etc ... just music. My Cayin HA-1A MKII had a faulty power tube, but it still does a little zzzz which changes depending on the position of the impedance selector, I think I will...

I understand cayin's policy and that's normal, I think that one of the tubes has a problem because it produced strange sounds (cracking, whistling, ...) and as soon as we touched it we heard noise.

electro harmonix EL84 tubes are not very expensive the change by Gold Lion or Pvsane is very good, you will not regret it

yes I also changed the 12AU7 when I received the amp, these are Pvsane 12AU7 and the EL84 Mark II Pvsane

Hi all, I received my EL84 Psvane tubes, the difference is immediate, the bass is much more powerful and especially more parasitic noise, crackles, whistles than I had with one of the original tubes, the new ones are less sensitive to shock, the originals as soon as we touched the amp we heard...

yes i m in europe, and i think it's a 50hz, the power tubes are heated alternately? Thank you for the link

no, on the two channel, with the 12au7 original it's the same, when I turn it on the noise is loud after 15-20 sec it decreases I know someone who bought the HA-6A it has the same noise.

@Andykong There is a snore like 50hz, the lower the impedance selector the less you hear the snoring, this snoring is due to what? there are also sometimes strange sounds (noises) like hissing, if I tap on the amp this noise disappears or reappears, what can it come from? I do not have this...

I will try to find 12AU7 gold lion, I have Pvsame 12AU7 which gives good, but I want to try the gold lion

I do not think that the choice of the headphone impedance selector on the smallest position hurts the headphones or the amp, I have a T90 of 250ohms and my selector is on the lowest position to not not have that background noise.

which tube

The sound is softer, the voice forward, the treble more detailed, more open. but the original tubes have not been run in. Sorry , i use translate for english.