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Little Dot Tube Amps: Vacuum Tube Rolling Guide - Page 418

post #6256 of 7505
Quote:
Originally Posted by mordy View Post
 

I know that there are people on the blog that tried various sub miniature tubes in the past. One such post came from Critical Bill, maybe in 2009, but right now I cannot find his post. Would appreciate it if somebody has information, as well as information on comparisons between different dual triode sub minis.

 

His handle is Ctritical Bill.

post #6257 of 7505
Quote:
Originally Posted by mordy View Post
 

Hi I lovemusic2,

 

Glad you like the 6832 tubes. As with everything else, the sound depends on the associated equipment, and in my case I found the 6832s very good as power tubes, but ultimately lacking in the bass slam and impact.

 

I am happily using one as a driver, but I went back to my RCA 6SN7GTB tubes as power tubes. In the future I would like to try a pair of 6080 tubes as power tubes, but these require external power supplies since they draw 2.5A each. Once all the parts come in I am going to try and see how it sounds.

 

I know that there are people on the blog that tried various sub miniature tubes in the past. One such post came from Critical Bill, maybe in 2009, but right now I cannot find his post. Would appreciate it if somebody has information, as well as information on comparisons between different dual triode sub minis.

 

Somehow the sub miniature tubes do not have the visual appeal of the Coke Bottle tubes, but looks isn't everything!

 

 

 

These are mighty minis, and really the pinnacle of vacuum tube technology. For those of you who like to travel with the LD amp, they are good for 80,000 feet altitude (commercial air planes fly under 40,000 feet). They can withstand a 500G impact, and 2,5G vibration, as well as nuclear radiation. The amplification factor is 40.

 

Which one is the best sub miniature tube for the LD MKIII?

 

Hi mordy.

 

Your and gibosi's wee wonders certainly sound interesting...would have been SO much easier to adapt than the C3G, viz the DIY version! And also, it seems, would have been a lot cheaper, lol!

 

Ah well, another of life's "if only's". Mind you, I think they would look a little 'strange' perched in front of the giants...and I am into aesthetics, as w

 

ell as sound :tongue:.

 

 

As an update to my previous post, re the E88CCs driving the "coke bottles", it appears I have been granted a reprieve...after their initial "wow" factor, the C3GS still reigns supreme and I have no regrets spending out on them - apart from the price some have been going for! (I was looking for weeks and never had that kind of luck :(.  And am back in love with them even more now I have finished silver wire adapter #2...there is no doubt in my mind that pure silver in as much of the signal path as possible does bring extra benefits...most notably in the treble area - more 'sparkle', and decay to the notes...lovely...

 

I cannot wait for your comments when you get those 6080s in the hot seat...you are in for one hell of a surprise mordy - if mine is anything to go by...and wouldn't it be great if someone out Far East did make an adapter with the 2 power leads exiting the back...makes for a nice , neat package... :

 

Ah well, the picture was supposed to end up here, not above...but didn't! Sometimes this site does some VERY strange things lol! Still, am very grateful for it nonetheless.

post #6258 of 7505

Hi G,

 

Thanks for the proper spelling - found the post on page #268.

post #6259 of 7505
Quote:
Originally Posted by mordy View Post
 

Hi I lovemusic2,

 

Glad you like the 6832 tubes. As with everything else, the sound depends on the associated equipment, and in my case I found the 6832s very good as power tubes, but ultimately lacking in the bass slam and impact.

 

I am happily using one as a driver, but I went back to my RCA 6SN7GTB tubes as power tubes. In the future I would like to try a pair of 6080 tubes as power tubes, but these require external power supplies since they draw 2.5A each. Once all the parts come in I am going to try and see how it sounds.

 

I know that there are people on the blog that tried various sub miniature tubes in the past. One such post came from Critical Bill, maybe in 2009, but right now I cannot find his post. Would appreciate it if somebody has information, as well as information on comparisons between different dual triode sub minis.

 

Somehow the sub miniature tubes do not have the visual appeal of the Coke Bottle tubes, but looks isn't everything!

 

 

 

These are mighty minis, and really the pinnacle of vacuum tube technology. For those of you who like to travel with the LD amp, they are good for 80,000 feet altitude (commercial air planes fly under 40,000 feet). They can withstand a 500G impact, and 2,5G vibration, as well as nuclear radiation. The amplification factor is 40.

 

Which one is the best sub miniature tube for the LD MKIII?

Hi Mordy,

      The 6080 is identical to 6AS7 i beleived by using 2 as power tubes for MK III(which i have) IMO there is nothing special about it except creating a lot of heat for the MK III i'am not comfortable using it as a power tubes on my MK III it gets  too hot.As much i love to push my amp to it's limit i would not bother using it with my amp although it works.Enjoy and Good luck with your 6080!

post #6260 of 7505

Did you use separate external power supplies?

post #6261 of 7505
Quote:
Originally Posted by mordy View Post
 

Did you use separate external power supplies?

Yes i did...12A regulator.


Edited by i luvmusic 2 - 5/25/14 at 2:05pm
post #6262 of 7505

Speaking of power supply how important it is to have a DUMMY LOAD RESISTOR on one of the power rail?

post #6263 of 7505
Quote:
Originally Posted by i luvmusic 2 View Post
 

      The 6080 is identical to 6AS7 i beleived by using 2 as power tubes for MK III(which i have) IMO there is nothing special about it except creating a lot of heat for the MK III i'am not comfortable using it as a power tubes on my MK III it gets  too hot.As much i love to push my amp to it's limit i would not bother using it with my amp although it works.Enjoy and Good luck with your 6080!

 

Hypnos1 has been running 6AS7's in his MK IV and his most recent temperature measurements on a critical resistor don't seem overly hot: 

 

"36C after 1 hour, and 39C after 4.5 hrs"

 

Have you taken similar measurements in your MK III?

post #6264 of 7505

Do you think you should use these if you choose to go sub mini?

link 9-pin breadboard / prototype tube socket for DIY experimenting @ ebay


Edited by bbmiller - 5/25/14 at 3:14pm
post #6265 of 7505
Quote:
Originally Posted by gibosi View Post
 

 

Hypnos1 has been running 6AS7's in his MK IV and his most recent temperature measurements on a critical resistor don't seem overly hot: 

 

"36C after 1 hour, and 39C after 4.5 hrs"

 

Have you taken similar measurements in your MK III?

No i did not but IMO when touching the case it's too hot to the touch hotter than usual.I don't know about MK IV if they have same resistor rating with MK III and  i'm not willing to open up my MK III again LOL.

post #6266 of 7505
Quote:
Originally Posted by bbmiller View Post
 

Do you think you should use these if you choose to go sub mini?

link 9-pin breadboard / prototype tube socket for DIY experimenting @ ebay

Yes you can! see gibosi's and Mordy's post or you can refer to mine just used the terminal block as long as the tube leads are long enough to reach those terminal blocks.

post #6267 of 7505
Quote:
Originally Posted by i luvmusic 2 View Post
 
Quote:
Originally Posted by bbmiller View Post
 

Do you think you should use these if you choose to go sub mini?

link 9-pin breadboard / prototype tube socket for DIY experimenting @ ebay

Yes you can! see gibosi's and Mordy's post or you can refer to mine just used the terminal block as long as the tube leads are long enough to reach those terminal blocks.

I guess then what I am asking that is that prototype board the right size to plug a sub meanie tube into straightaway without doing what you are showing above?

 

P.S. after looking at your picture I think the one that's right for the minis is linked and pictured below.

 

7-pin mini breadboard / prototype tube socket for DIY experimenting


Edited by bbmiller - 5/25/14 at 4:05pm
post #6268 of 7505

IMHO 6AS7 as power tubes for MK III is not much of an improvement over 6SN7's .With 6AS7 power tubes less bass but a bit more on detail and soundstage.

post #6269 of 7505

Or it could be less bass because of my 6AS7 (mine is 6H13C)Brand/Manufacturer maybe it depends on tubes brand/manufacturer i could be wrong.

NOTE: I'am not trying to discourage some of you guys to used 6AS7 as power tubes it's just my opinion.

post #6270 of 7505
Quote:
Originally Posted by bbmiller View Post
 

I guess then what I am asking that is that prototype board the right size to plug a sub meanie tube into straightaway without doing what you are showing above?

Those socket  are bigger than the minis leads refer to gibosi's and mordy's post a few pages back they've used cutt off solid copper cable to fit on those sockets. 

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