Those are E80CC Philips Special quality (SQ) gold pins edition .
Very interesting, so if you had to do a quick comparison among Mullard , Mazda and the stock 6V6 ones how would it be? (Always considering that you're using the same driver tubes.Awesome man
I cannot wait for them to get even better but yeah I have the HEKSE and they indeed work perfectly well together. 
I have the HEKSE as well so knowing you are getting a good experience with them is good to hear.Awesome man
I feel the same, I'm not in a rush but it is just my curiosity that makes me want to get more information about other tubes
Ultron 5
Renexx
Can it get much better than this ?
Telefunken G73R + Visseaux 6V6GT + Raytheon 22DE4 grey plates.
Neutral frequency response, resolving, big staging. That's how I would describe the sound of the Telefunkens. The Visseaux and Raytheon tubes add a sense of Resonance and non fatigue touch to the presentation. No linear European Ecc82 can sound "boring" with this combination.
Great combination for my Caldera overall.
Do I think these outperform a Telefunken ecc82 smooth plate? The difference might be relatively small. The overall sound signature is the same at least with this amplifier and this tube roll.
Neutral tuning with big staging and slightly lean bass. Maybe the G73R raise the level of resolution a little so the Cayin actually performs on par with my Euphoria OTL in terms of resolution.
Maybe Mazda 6V6Gs can squeeze out some more linearity and transparency. For sure the sound will be more bright and dynamic. Let's find out tomorrow.
NJoyzAudio:Ultron 5
Sorry been working on some new portable items I wanted to try out, less about my tube amp this week and that damn pesky day job called "work" keeps getting in the way....
Just want to re-enforce, Tube Rolling isn't limited to brands, or type of tubes. its about the sound you are looking for, and fine tunning your amp.
There is NO magic bullet tube or sound, since it has to be your sound. Getting what some call the Holy Grail of Tubes for 12AU7 or 6V6 might not be your sound preference.
Even within a brand,(RCA 12U7 as example: There are sub variants like 12AU7WA, 6189, and within the 12AU7 there are different types form other vendors there is ECC82, 5814, CV491, CV4034, CV4004, all of which are 12AU7 tubes but made for special circumstances and will work where a normal 12AU7 would be and EACH can SOUND different, hence my comment its about the sound.
Then there is the E80cc which is pin and in general spec similar to the 12AU7, but has a higher heater voltage and more gain but has been confirmed can work with the HA-3A by Cayin Engineers.
And I've seen post on other boards where people have used adapters to put in other PreAmp tubes in place of the 12AU7
And finally there are plate types, both materials and size that can influence the sound.
Same kind of variations exist with the 6V6 Power tubes also.
Additionaly, MANY brands are relabels of another maker (E80cc and 6V6 have many examples of this)
An example of plate type and relabeling is a post I made about a week ago.
I have a set of tubes that were made by Mazda using their Silver(Chrome Platting) plates, but are labeled as Philips. Its documented these are made by Mazda and have Mazda Factory markings on them. but they are also less expensive than the actual Mazda logo'd versions as Philips had made and sold more of these than Mazda did and are easier to find to the tune of $300 or more less expensive per pair.
We as audiophiles do these crazy things because we are chasing a sound signature. Tube rolling with all the above caveats is an example of this.
The goal is to find information so you can find tubes that suit the sound signature your seeking, and in some cases it can be multiple signatures dependent on source material.
Its less about a science or brand,
Its more about the search, the testing and then being able to meet/find that sound you want
I notice others are giving you good advice to use the stock tubes, and figure out what you like or don't like with those tubes and then ask/search for/research which tubes might give you that sound and borrow or buy tubes to see if it will get you where you want to go. Head-fi has forums dedicated to tube rolling, and there are others dedicated to Tube types. The Pentode/Triode forum has been up and running for years and has hundreds of pages in it with examples of what people are using as criteria that may help you.
Tube rolling is a personal thing.
No one opinion is right or wrong.
You've landed in one of the friendliest and most helpful forums for tube amps, this one
So glad you are asking, we are all here to help, but you and only you know what sound you want, and the only way to ask is know what your baseline is and ask for help understanding which way you want to move from there.
Don't get to eager too fast/too far over the end of your skis too quickly, finding the right sound rewards those who are patient.
All of us who tube roll own some very inexpensive tubes that probably we prefer to our most expensive tubes. And others Visa Versa
No right answer, but my suggestion is don't ask which is best, as it is hard to answer if you don't give the "vs. this baseline tube/measurment/impression" and "I want to go in X direction from this baseline"
IF you do this you will get a lot of answers and opinions and from there you can definitely move without breaking the bank.
I also noticed someone reffered to the chart Renex posted and I have reposted (giving credit to Renex) and will repost again below
An approach I took when I decided to get back into tubes after a VERY long hiatus from home/desktop gear, was to go get the most inexpensive versions of a tube in each of the quadrant in his chart (in general it was the RCA versions) so I could understand when Renexx posted his impressions, and someone like Betula, Robert, Louisiana or others responded to him, I could have an idea of what each was saying which helped me form my own opinions of what they were sharing to see if it was a direction I wanted to go. It helped a lot. Once I knew what was the sound in each quadrant it was easier (will never say easy as now I think I've become a 12AU7/E80cc/6V6 collector because of rushed decisions or personal mistakes but so far have not sold off any as well some you can no longer get) as a result I now have tubes that are either the sound I want or a variation of it depending on what I'm looking for or help the headphones/IEM's I'm using/borrowing IMO to sound the way I want.
That chart is included at the end of this post
And as others have said changing these tubes in this order will give you the most change to sound, but all changes do effect the sound
Preamp tubes (12AU7 or variants) give the most change
Power Tubes (6V6 or variants) will influence the sound by warming it up or cooling it down mostly, but can affect overall sound, but its subtle
Rectifier tube - has the least amount of influence but still can change the sound by altering the clarity of the sound. (IMO)
Just IMO and definitely YMMV, but congrats on your purchase of an HA-3A, don't forget to step back and enjoy the sound/music, and from there Tube Rolling can become a fun and addictive chase down the rabbit hole.
Enjoy!.
TheAbyss2022:
Ultron 5
Lots of wisdom and sound advice. Thanks for sharing them. I have been using above chart as I ventured into the land of tube rolling with my HA-6A previously and I found them to be quite helpful in seeking the sound signature that I like. For me, I sit firmly in the camp of warm, smooth and rich quadrant.Ultron 5
Sorry been working on some new portable items I wanted to try out, less about my tube amp this week and that damn pesky day job called "work" keeps getting in the way....
Just want to re-enforce, Tube Rolling isn't limited to brands, or type of tubes. its about the sound you are looking for, and fine tunning your amp.
There is NO magic bullet tube or sound, since it has to be your sound. Getting what some call the Holy Grail of Tubes for 12AU7 or 6V6 might not be your sound preference.
Even within a brand,(RCA 12U7 as example: There are sub variants like 12AU7WA, 6189, and within the 12AU7 there are different types form other vendors there is ECC82, 5814, CV491, CV4034, CV4004, all of which are 12AU7 tubes but made for special circumstances and will work where a normal 12AU7 would be and EACH can SOUND different, hence my comment its about the sound.
Then there is the E80cc which is pin and in general spec similar to the 12AU7, but has a higher heater voltage and more gain but has been confirmed can work with the HA-3A by Cayin Engineers.
And I've seen post on other boards where people have used adapters to put in other PreAmp tubes in place of the 12AU7
And finally there are plate types, both materials and size that can influence the sound.
Same kind of variations exist with the 6V6 Power tubes also.
Additionaly, MANY brands are relabels of another maker (E80cc and 6V6 have many examples of this)
An example of plate type and relabeling is a post I made about a week ago.
I have a set of tubes that were made by Mazda using their Silver(Chrome Platting) plates, but are labeled as Philips. Its documented these are made by Mazda and have Mazda Factory markings on them. but they are also less expensive than the actual Mazda logo'd versions as Philips had made and sold more of these than Mazda did and are easier to find to the tune of $300 or more less expensive per pair.
We as audiophiles do these crazy things because we are chasing a sound signature. Tube rolling with all the above caveats is an example of this.
The goal is to find information so you can find tubes that suit the sound signature your seeking, and in some cases it can be multiple signatures dependent on source material.
Its less about a science or brand,
Its more about the search, the testing and then being able to meet/find that sound you want
I notice others are giving you good advice to use the stock tubes, and figure out what you like or don't like with those tubes and then ask/search for/research which tubes might give you that sound and borrow or buy tubes to see if it will get you where you want to go. Head-fi has forums dedicated to tube rolling, and there are others dedicated to Tube types. The Pentode/Triode forum has been up and running for years and has hundreds of pages in it with examples of what people are using as criteria that may help you.
Tube rolling is a personal thing.
No one opinion is right or wrong.
You've landed in one of the friendliest and most helpful forums for tube amps, this one
So glad you are asking, we are all here to help, but you and only you know what sound you want, and the only way to ask is know what your baseline is and ask for help understanding which way you want to move from there.
Don't get to eager too fast/too far over the end of your skis too quickly, finding the right sound rewards those who are patient.
All of us who tube roll own some very inexpensive tubes that probably we prefer to our most expensive tubes. And others Visa Versa
No right answer, but my suggestion is don't ask which is best, as it is hard to answer if you don't give the "vs. this baseline tube/measurment/impression" and "I want to go in X direction from this baseline"
IF you do this you will get a lot of answers and opinions and from there you can definitely move without breaking the bank.
I also noticed someone reffered to the chart Renex posted and I have reposted (giving credit to Renex) and will repost again below
An approach I took when I decided to get back into tubes after a VERY long hiatus from home/desktop gear, was to go get the most inexpensive versions of a tube in each of the quadrant in his chart (in general it was the RCA versions) so I could understand when Renexx posted his impressions, and someone like Betula, Robert, Louisiana or others responded to him, I could have an idea of what each was saying which helped me form my own opinions of what they were sharing to see if it was a direction I wanted to go. It helped a lot. Once I knew what was the sound in each quadrant it was easier (will never say easy as now I think I've become a 12AU7/E80cc/6V6 collector because of rushed decisions or personal mistakes but so far have not sold off any as well some you can no longer get) as a result I now have tubes that are either the sound I want or a variation of it depending on what I'm looking for or help the headphones/IEM's I'm using/borrowing IMO to sound the way I want.
That chart is included at the end of this post
And as others have said changing these tubes in this order will give you the most change to sound, but all changes do effect the sound
Preamp tubes (12AU7 or variants) give the most change
Power Tubes (6V6 or variants) will influence the sound by warming it up or cooling it down mostly, but can affect overall sound, but its subtle
Rectifier tube - has the least amount of influence but still can change the sound by altering the clarity of the sound. (IMO)
Just IMO and definitely YMMV, but congrats on your purchase of an HA-3A, don't forget to step back and enjoy the sound/music, and from there Tube Rolling can become a fun and addictive chase down the rabbit hole.
Enjoy!.
Yes I will do a good comparison when time allows me. Just busy weekend.Those are E80CC Philips Special quality (SQ) gold pins edition .
The Genalex are the Gold Lions Platinum that @TheAbyss2022 ordered and it will be nice to hear his impressions cause he's more experienced than me.
You can start by reading this post from the beginning as someone else suggested. You can also go to Brent Jesse webpage and check the description on the tubes/brands, I have found that it is consistent to people comments in this post.
