[IPMano]

Yes i have 2 week for return HA-6A.

 

[GU1DO]

I do it, i receive 8 june, but now i'm afraid because there is a hiss output, maybe i delete my request.

i highly suggest you wait and cancel your order

 

[GU1DO]

Reading through the thread has left me wondering how loud the hiss is, it seems like it’s only with the balanced output.
Considering the balanced lowest power output 1000mw and can reach 4500mw (depending on tubes and setting) It doesn’t seem that unexpected to me.
On my 1A-HA mk2 I never even go to half volume... maybe I should consider something with less power

its not loud but it is there , to me at this state is unusable , if not fixed i will return it back , i dont think it is a power issue , it is voltage issue , mainly dynamics with all impedance's has the hiss .

 

[Fatdoi]

its not loud but it is there , to me at this state is unusable , if not fixed i will return it back , i dont think it is a power issue , it is voltage issue , mainly dynamics with all impedance's has the hiss .

seems my hope to own a OT tube amp is not happening again....

 

[Slim1970]

All this talk about hiss is concerning with this amp. I wonder if this is why it’s no longer available on Musicteck’s websight? I hope it’s being addressed by Cayin. The balanced output should be more quiet than the SE output in normal situations.

 

[IPMano]

What does Andykong think of this ?

 

[IPMano]

if i understand, it is only on the XLR output that there is the hiss? on the 6.3 jack output there is not this hiss?

 

[Relaxasaurus]

Long story short the American distributor has been discussing this with Cayin. Their engineers were able to reproduce the issue and they apparently have a fix but it requires a resistor change, so yes I would hold off on all orders at the time until update their production and have it back on the site.

They are sending me the resistors to try out but it's still in transit. That's about all I know at this point.

Hiss comes from all outputs when using dynamic headphones but is the worst on balanced XLR.

 

[Andykong]

if i understand, it is only on the XLR output that there is the hiss? on the 6.3 jack output there is not this hiss?

To be exact, this problem. hiss on XLR4 outputs when using dynamic headphones, only appear on @Relaxasaurus unit, this is the first instance reported and we are studying it closely. We haven't encountered any other case that exhibit similar problem. We are working with Andrew from Musicteck to resolve this problem, unfortunately Andrew sold his demo unit recently, otherwise they can send a demo unit to Relaxasaurus for crosschecking and as temporary replacement.

 

[GU1DO]

All this talk about hiss is concerning with this amp. I wonder if this is why it’s no longer available on Musicteck’s websight? I hope it’s being addressed by Cayin. The balanced output should be more quiet than the SE output in normal situations.

Yeah they pulled it out few days ago , i ordered mine before that, and it is from Cayin china directly, hiss is very clear , problem is that i dont have other tubes , i am expecting new ones within next 2-3 weeks, hopefully Cayin will wait for me to try the new tubes otherwise its going back, crazy thing i was looking for an amp that can power planers and then changed my mind to dynamics, so i thought the HA6A with lower power rating than the HA300 , would be more suitable , this amp can power anything easily, it has crazy amount of power, i cant imagine how is the HA300.

 

[GU1DO]

if i understand, it is only on the XLR output that there is the hiss? on the 6.3 jack output there is not this hiss?

its in both output but it is very high in the balanced output ..

 

[Zachik]

i thought the HA6A with lower power rating than the HA300 , would be more suitable , this amp can power anything easily, it has crazy amount of power, i cant imagine how is the HA300.

Based on a sample of 1 (my buddy's HA300) - no hiss at all. Been a while since we met (thanks COVID-19...) but I really was impressed by the HA300.

 

[Fatdoi]

Yeah they pulled it out few days ago , i ordered mine before that, and it is from Cayin china directly, hiss is very clear , problem is that i dont have other tubes , i am expecting new ones within next 2-3 weeks, hopefully Cayin will wait for me to try the new tubes otherwise its going back, crazy thing i was looking for an amp that can power planers and then changed my mind to dynamics, so i thought the HA6A with lower power rating than the HA300 , would be more suitable , this amp can power anything easily, it has crazy amount of power, i cant imagine how is the HA300.

on earlier HA300 forum, some also had hissing issue.... think they've fixed it by now.

 

[Andykong]

Yeah they pulled it out few days ago , i ordered mine before that, and it is from Cayin china directly, hiss is very clear , problem is that i dont have other tubes , i am expecting new ones within next 2-3 weeks, hopefully Cayin will wait for me to try the new tubes otherwise its going back, crazy thing i was looking for an amp that can power planers and then changed my mind to dynamics, so i thought the HA6A with lower power rating than the HA300 , would be more suitable , this amp can power anything easily, it has crazy amount of power, i cant imagine how is the HA300.

Let me help you to trace your case, I need the serial number of your HA-6A, will send you an PM to start the follow up process.

 

[GU1DO]

Let me help you to trace your case, I need the serial number of your HA-6A, will send you an PM to start the follow up process.

Thank you very much for the care and support.