[MRpilgrim]

I would get the Aune t1 and whatever tubes from there since I get free shipping being in Singapore. Would you have any experience with this? http://www.quartzacoustic.com/shop/driver-tubes/hp-6dj8-a-frame-mullard-pre-amp-tube/ Thanks

 

[Salvatore]

No personal experiences, but I've found those quartz tube descriptions to be very informative:
 
"By looking at the type code first, GA of the GA0 (is G-A-’zero’, not G-A-O) clearly presented in indicative of the tube variant, in this case ECC88, a European designation for the 6DJ8 tube types. 0 is the batch number, an indication only important to the factory that produced these tubes. The next code in line is supposedly indicative of the Mullard manufacturer in this case. While ‘B’ is still quite clearly seen followed by ’6′, which says it was made in Mullard plant in Blackburn, England, in the 1966, the subsequent codes are harder in distinguishing. Those will only be indicative of the month and week of production.
 
Tube variant #1 has an additional print of Holland, although that is only an indicative sign that Mullard plant in Blackburn made that tube for one of Amperex OEM, HP, which Amperex made some of the other labels like Philips, Dario Miniwatt, DuMont etc under the same Bugel Boy factory in Heerlen factory, Holland.
 
So, seemingly Holland labels, but British made! Mullards are known for their warm velvety sounds that some cherished and loved so much, for that they feel bring out the analogue sound that translate to natural and living. Yes, these tubes showed such characteristics in our tests.
 
For those who have been listening to solid-state (SS) amps or using tubes that exhibit all the cleaniness and crispiness of sounds might find these HP 6DJ8 A-frame tubes slightly less sharp. It could be a bit uneasy at first, but hold on, and you might begin to just feel so comfortable with the smooth rendition of the highs and mids. Vocals are especially feeling very warmth and intimate. Bass is ever so laidback but never uncompromising. Resolution is fantastic, to leave one not congested from the warmth which some SS tries to sell the ‘tube sound’."
 
In this case, however, I'm not sure if the factory code descriptions are accurate. All the info I've been reading suggest that A-frame support was more of a 70's invention. There is definitely B6 to be seen, but I think that #1 is actually a 1976 Mullard 6DJ8 A-Frame (similar to this: http://www.ebay.com/itm/1-Matched-Pair-H-P-Mullard-A-Frame-ECC88-6DJ8-E88CC-6922-CV2492-Cca-TUBES-/271175276100?pt=Vintage_Electronics_R2&hash=item3f234e5644). # 1 is in better condition but the price is too high for 70's A-frame IMO.

 

[DestinyBear]

I feel a lot more people will be joining this thread since a certain group buy website that drops prices when people buy in mass, has the aune t1 up.
 
Also, comparing the OG and the Amperex 7308, what are the differences in sound.

 

[CoiL]

Quote:

I would get the Aune t1 and whatever tubes from there since I get free shipping being in Singapore. Would you have any experience with this? http://www.quartzacoustic.com/shop/driver-tubes/hp-6dj8-a-frame-mullard-pre-amp-tube/ Thanks

Just get Aune T1 and Amperex OG from there and forget other tubes until your own ears feel that they need something else.
I have Mullard ECC88 (Heerlen Holland, newer shield logo, a-frame dimple disc getter) and I personally feel it`s highs are littlebit "flat" sounding. It is very good tube but Amperex OG`s are better for my ears & cans. 

 

[Spiderman]

Does anyone have any experience running this dac with the mad dogs? I am worried it won't provide enough power.

 

[AxelCloris]

Quote:

Does anyone have any experience running this dac with the mad dogs? I am worried it won't provide enough power.

 
I haven't had my T1 long, but so far it sounds pretty darn nice with my Mad Dogs. That said, I feel the T1 does a better job of driving my Q701s than the Mad Dogs, but I still really enjoy how they sound. I had the Magni/Modi stack before with the MDs, and both are nice. I think the Schiit provided better power, but the tube on the Aune adds something that the Schiit Stack can't, customization. (Though I haven't gotten into tube rolling yet myself.) Also, considering I got my T1 for just shy of $120, I feel it was better value for money.
 
In a nutshell, it's not bad for power, but there are those who swear by more powerful amps with the MDs. Also, glowing tubes are pretty.

 

[DestinyBear]

Axel, can you please compare the modi/magni stack with the Aune T1, it's been something that was troubling me heavily before my purchase and I'd like to know your honest opinion. Other than customization, in terms of sound, how do they differ.

 

[MRpilgrim]

Just get Aune T1 and Amperex OG from there and forget other tubes until your own ears feel that they need something else.
I have Mullard ECC88 (Heerlen Holland, newer shield logo, a-frame dimple disc getter) and I personally feel it`s highs are littlebit "flat" sounding. It is very good tube but Amperex OG`s are better for my ears & cans. 

Thanks for the help. I think I will probably order the Aune t1 and Amperex OG from quartz once I have saved the money.

 

[DestinyBear]

Can anyone tell me if these are Orange Globes. 
 
http://i.ebayimg.com/00/s/NzY4WDEwMjQ=/z/OC0AAMXQDfdRvfNR/$T2eC16hHJI!E9qSO-S1hBRvfNQ2flw~~60_57.JPG
 
Listing included that [size=small]these are dimpled plate getter with A-frame.[/size]

 

[boyang1724]

Can anyone tell me if these are Orange Globes. 

http://i.ebayimg.com/00/s/NzY4WDEwMjQ=/z/OC0AAMXQDfdRvfNR/$T2eC16hHJI!E9qSO-S1hBRvfNQ2flw~~60_57.JPG

Listing included that [size=small]these are dimpled plate getter with A-frame.[/size]

Don't think so. Your listing has GAE/0H3 AND GAE/2J2 which should be close to this:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=181169778552

I think only the GAC are Orange Globes. Might need to check on that though.

 

[icecap]

Quote:

 
In this case, however, I'm not sure if the factory code descriptions are accurate. All the info I've been reading suggest that A-frame support was more of a 70's invention.

 
Interesting observation, Salvatore! I checked up on this and actually realised they did exist before 1970s. Brent Jesse from http://www.audiotubes.com/6dj8.htm has listings of Mullard-labelled (or not) with Blackburn factory codes from the 60s. Joe from http://www.audioasylum.com/scripts/d.pl?audio/faq/joes-tubes.html#6DJ8 mentioned this A-frames came from mid/60s onwards through 70s.
 
And one thing to note on the colour of the label for Amperex tubes, applied similarly to other OEMs made for them, is that white labels preceded orange labels. Hence, orange labels are mostly certain to come from 70s, while white labels can come from both.. Which I presumed this as a result distinctly differentiate the signatures, and probably prices, of  Bugle Boys / White Labels from the Orange Globe or other orange labels along the same series.. cannot compare between, say, 6DJ8 white labels with 7308 Orange Globe.
 
Quote:

I think only the GAC are Orange Globes. Might need to check on that though.

 
As for the identification of the Orange Globes, I think GAC or GAE for the matter, GA is only to identified it is a ECC88 type, which is European designation for 6DJ8. And that C or E is a batch code thingy, or change symbol. I read it from here: http://frank.pocnet.net/other/Philips/PhilipsCodeListAB.pdf
 
Hence the type code might not be conclusive enough in determining Orange Globe or not, GAE might still be possible being an Orange Globe.. but the fact that Orange Globes are commonly seen with GAC codes, this is telling maybe on batch 'C' Orange Globes were produced and they were produced lesser or none on another batch down the line which we have/will not seen/see as much as 'C'.

 

[Salvatore]

Come on guys why don't you just read more? Once again please check post #2016 on page 135, http://www.head-fi.org/t/633006/aune-t1-usb-tube-dac-amp-discussion-thread-see-first-post-for-faq/2010#post_9502294 I've spent much time creating this info. There is specific OG info section and a section which teaches you to interpret factory codes. The old 60's halo getters are the "real" orange globes. They later introduced stronger A-frame support from which the globe logo is often missing. Coil has compared different orange prints and according to his impressions the older ones are the best, but they all sound very good. A-frames are often much cheaper. To be accurate, orange print means all orange print amperexes and OG means the older version where the actual globe is printed in the logo.
 
Beware of the infamous red label amperexes. They are british made and apparently way worse than the real deal.

 

[Sorrodje]

Quote:

Come on guys why don't you just read more? Once again please check post #2016 on page 135, http://www.head-fi.org/t/633006/aune-t1-usb-tube-dac-amp-discussion-thread-see-first-post-for-faq/2010#post_9502294 I've spent much time creating this info. There is specific OG info section and a section which teaches you to interpret factory codes. The old 60's halo getters are the "real" orange globes. They later introduced stronger A-frame support from which the globe logo is often missing. Coil has compared different orange prints and according to his impressions the older ones are the best, but they all sound very good. A-frames are often much cheaper. To be accurate, orange print means all orange print amperexes and OG means the older version where the actual globe is printed in the logo.
 
Beware of the infamous red label amperexes. They are british made and apparently way worse than the real deal.

 
 
Maybe you should PM the OP or a moderator in order to add your perfect summary to the first post of this thread ? it should me easier to find IMO. 

 

[Salvatore]

Quote:

Interesting observation, Salvatore! I checked up on this and actually realised they did exist before 1970s. Brent Jesse from http://www.audiotubes.com/6dj8.htm has listings of Mullard-labelled (or not) with Blackburn factory codes from the 60s. Joe from http://www.audioasylum.com/scripts/d.pl?audio/faq/joes-tubes.html#6DJ8 mentioned this A-frames came from mid/60s onwards through 70s.
 
And one thing to note on the colour of the label for Amperex tubes, applied similarly to other OEMs made for them, is that white labels preceded orange labels. Hence, orange labels are mostly certain to come from 70s, while white labels can come from both.. Which I presumed this as a result distinctly differentiate the signatures, and probably prices, of  Bugle Boys / White Labels from the Orange Globe or other orange labels along the same series.. cannot compare between, say, 6DJ8 white labels with 7308 Orange Globe.

 
This is indeed interesting stuff. I really enjoy studying the history of these tubes. Feels like being a detective of some sort I still think A-frame is mainly 70's stuff (or late 60's). Not sure if this particular tube is actually 1966 a-frame, but I'd give it a higher probability to be 70's tube just like they stated in that ebay auction.
 
Apparently this was the info you referred into?
 
"You will often find a different internal structure in what are apparently late production 6DJ8 family tubes from the mid/late ‘60s through the ‘70s. These tubes sometimes had a simplified internal structure that eliminated the splatter shield / getter halo arrangement. In these tubes two metal bars angle up from the upper mica spacer, almost to a point, with a small metal disc on top. Viewed from the side this metal structure on top of the upper mica spacer looks a bit like the letter A hence the nickname A frame. The other exceptions are some late Siemens 6922s & 7308s that just have a single metal rod rising above the upper mica spacer with a ring shaped getter halo on top a practice copied in the Russian 6922s and 6H23Ns."
 
Quote:

As for the identification of the Orange Globes, I think GAC or GAE for the matter, GA is only to identified it is a ECC88 type, which is European designation for 6DJ8. And that C or E is a batch code thingy, or change symbol. I read it from here: http://frank.pocnet.net/other/Philips/PhilipsCodeListAB.pdf
 
Hence the type code might not be conclusive enough in determining Orange Globe or not, GAE might still be possible being an Orange Globe.. but the fact that Orange Globes are commonly seen with GAC codes, this is telling maybe on batch 'C' Orange Globes were produced and they were produced lesser or none on another batch down the line which we have/will not seen/see as much as 'C'.

 
This is very true. This code only tells you the tube type and batch. For more accurate info you need the whole factory codes.

 

[Salvatore]

Quote:

Maybe you should PM the OP or a moderator in order to add your perfect summary to the first post of this thread ? it should me easier to find IMO. 

 
Perfect, lol. It's a good place to start, but could be always better. We should all work together to make it to get there. Hopefully Coil gets his colossal tube collection reviewed. That would be an awesome addition.