[Andykong]

Andy shared this picture in the Ha300 thread.

Thought I'd post it here since there is also a Black Ha-6A on the horizon.

Not sure if it's just the color or a Mk2 Kind of deal.

If it's Mk2 I'd really hope for Support up to KT170

Thank you for sharing the photo.

Unfortunately, we don't have a HA-6A MK2 in our development plan, and we don't have any plan to use KT150 or KT170 in our tube headphone amplifier in foreseeable future.

 

[hongthaie]

Tube amp bring warm sound, I like detail and clear

 

[ThanatosVI]

Tube amp bring warm sound, I like detail and clear

That depends on the amp and tubes used.

 

[krude]

I've got my HA6a for a few months now and decided to share my thoughts.

TL;DR I love it

a bit longer bit ... I use it with Utopia (for listening) and HD800 (for playing guitar), I mostly listen to hard and dynamic music, metal, rock, electronica, but also soundtracks, acoustic and bits of classical now and then, and for dynamic music it knocks it out of the park with Utopia. I use Holo May L2 as source, but tried it with Hugo 2 and it was still really good.

All 3 impedance settings are amazing, triode mode and UL are amazing, the slam, the punch, the smoothness, the bass ... drum impact, staging ...

It was a bit noisy at first but now after it (and tubes) burned in (use it with stock tubes in KT88 mode) it is pretty silent (for a tube amp).

Anyway, Utopia and HA6a is one of those pairings that blows my socks off every time I fire it up.

 

[Parnracing]

I got my HA-6A three days ago. come with JJ 12au7

I use it with Beyer DT1990 .
i found HIZZ noise from 1/4 on minimal volume. more found in UL mode
I test on Unplug everything. No any inputs. Only Power cable.

what should i do

 

[kimdeug]

I got my HA-6A three days ago. come with JJ 12au7

I use it with Beyer DT1990 .
i found HIZZ noise from 1/4 on minimal volume. more found in UL mode
I test on Unplug everything. No any inputs. Only Power cable.

what should i do

1. Try to do paper box test, I have described last page. To eliminate the ambient interference.
2. Try to roll 12AU7 tubes.
3. Give around 100 hours burning time.
4. Check the supply power and cable.

Regards,
Kim

 

[ThanatosVI]

1. Try to do paper box test, I have described last page. To eliminate the ambient interference.
2. Try to roll 12AU7 tubes.
3. Give around 100 hours burning time.
4. Check the supply power and cable.

Regards,
Kim

The Ha-6a does look gorgeous.
Those are socket savers on your 12au7 right?

 

[kimdeug]

The Ha-6a does look gorgeous.
Those are socket savers on your 12au7 right?

Yes. They are socket savers. Because a lot of 12Au7 tubes have more thicker pins.
Socket savers: https://www.aliexpress.com/item/1005003234451973.html?spm=a2g0o.cart.0.0.2eaa3c00bQWQTk&mp=1
Aluminium rings: https://www.aliexpress.com/item/4000012197427.html?spm=a2g0o.cart.0.0.2eaa3c00bQWQTk&mp=1

I have contacted to Poland Miltra manufacture to buy only 2 aluminium rings for my Cayin HA-6A.
Lets see: https://www.miltra.pl/index.php/produkt/headphone-tube-amplifier-miltra-otl-pcl86/

 

[Parnracing]

today i just got Arya.

hiss noies has disappeared.

I think my dt1990 have 109db is very sensitive with tube amps

 

[kimdeug]

today i just got Arya.

hiss noies has disappeared.

I think my dt1990 have 109db is very sensitive with tube amps

I am using my DT1990 pro with Cayin HA-6A now. Middle impedance, 1/4 jack, volume 9 o'clock. No hiss at all. No music, volume at 3 o'clock -- I can hear the tubes humm, but very little and it can be neglected. At real usage situation I never go above 9 o'clock.

 

[kimdeug]

Let me know how you get on. I won't be changing anything for a while as I don't want to rock the boat, but it'll be good to know what fuses you find work best

I am very skeptical about this upgrade.
Just have few Aliexpress vouchers to burn before 11.11
Lets see, what is this hype about.
Have ordered these fuses:
https://www.aliexpress.com/item/1005002559074708.html?spm=a2g0o.detail.1000014.13.4aca7afdM0volt&gps-id=pcDetailBottomMoreOtherSeller&scm=1007.13338.183347.0&scm_id=1007.13338.183347.0&scm-url=1007.13338.183347.0&pvid=ebabe69b-d581-4139-bf26-b5e85f6f1d51&_t=gps-idcDetailBottomMoreOtherSeller,scm-url:1007.13338.183347.0,pvid:ebabe69b-d581-4139-bf26-b5e85f6f1d51,tpp_buckets:668#2846#8109#1935&&pdp_ext_f={"sceneId":"23416","sku_id":"12000021138642122"}

Regards,
Kim

 

[Parnracing]

Hifiman Arya
If I use the middle gain, will there be a problem with the headphones or the amp?

 

[kimdeug]

Hifiman Arya
If I use the middle gain, will there be a problem with the headphones or the amp?

Not for amp, but for headphone it is not good. It is designed for optimal impedance 41Ohms. Better to use it on low impedance setup. If you put too big impedance you will burn/ damage the wire coil on magnet drivers.

 

[Lapinata]

Hi, I am totally a newbie to this hobby, never had any tube amp before. After spending hours on this forum I decided to purchase HA-6A. It has been 20 days of usage, burning period probably completed

So far I am in love with it. I do hear the hissing like many of you, but it is less noticeable when playing the music. Start hearing it when turning volume more than 10 o'clock, when reaching 2 o'clock it becomes unbearable (I will never reach that anyway, just do for the sake of testing)
*Test with Beyerdynamic DT990 Pro - Medium - 6.3 output*

Overall, I am pretty content with what I get from this unit. I decided to stick with EL34 because of its sweetness. Now, I'm aiming for the sound that gives me more diabetes. XD Willing to upgrade both JJ 12AU7 and EH EL34. Gold pin 12AU7 is very attractive to me.
Any recommendations ?? I would love to see the comparison between each brand as well since I am new here.
Oh...and the budget would be around $150 for each pair

 

[kimdeug]

Hi, I am totally a newbie to this hobby, never had any tube amp before. After spending hours on this forum I decided to purchase HA-6A. It has been 20 days of usage, burning period probably completed

So far I am in love with it. I do hear the hissing like many of you, but it is less noticeable when playing the music. Start hearing it when turning volume more than 10 o'clock, when reaching 2 o'clock it becomes unbearable (I will never reach that anyway, just do for the sake of testing)
*Test with Beyerdynamic DT990 Pro - Medium - 6.3 output*

Overall, I am pretty content with what I get from this unit. I decided to stick with EL34 because of its sweetness. Now, I'm aiming for the sound that gives me more diabetes. XD Willing to upgrade both JJ 12AU7 and EH EL34. Gold pin 12AU7 is very attractive to me.
Any recommendations ?? I would love to see the comparison between each brand as well since I am new here.
Oh...and the budget would be around $150 for each pair

Congrats. If you like sweet sound try the Sylvania 12AU7 NOS, They are very cheap around 10$ each green print. British made tubes Mullard, Brimar and CV.4003... not sure as do not remember the number are also sweet and soft. Do not be fullished by gold pins, like reissued JJ or ElectroHarmonics or Genalex or chinees Psvan gold pins tubes. They are looking nice, but is it all about the sound? I am listening with Tesla ECC802S now, and they are so close to 10 times expensive Telefunken E82CC. Regards, Kim

PS, for EL34 rolling try Reissued Russian Genalex KT77 tubes.