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Little Dot Tube Amps: Vacuum Tube Rolling Guide - Page 440

post #6586 of 10509

Hi Mordy,

  You should try 6080/6AS7G driver tube with 6080/6AS7G power tubes you may like this setup i've tried this and it sounds nice IMO.

post #6587 of 10509

Hi hypnos 1,

 

When I said talking/shouting I meant literally. I listen to classic jazz from the twenties and New Orleans Jazz, and it is not unusual that a musician will talk to another one or even shout something while performing, especially during a live recording. However, with these tubes I heard things I did not notice before.

 

How can I tell a graphite tube from a regular one? I have six different RCA 6080's, and only one real pair. The construction in five of them is slightly different from tube to tube.

 

Hi i lovemusic 2,

 

I am certainly willing to try three 6080's or two + the 6AS7. I hope that the third voltage regulator which is rated 2-3A is powerful enough.

post #6588 of 10509
Quote:
Originally Posted by mordy View Post
 

How can I tell a graphite tube from a regular one? I have six different RCA 6080's, and only one real pair. The construction in five of them is slightly different from tube to tube.

 

To my knowledge, only Bendix manufactured 6080 with graphite plates. However, they were often rebranded and sold under other labels.

 

Here are some pictures:

 

http://the-key.enix.org/~krystal/review-tube-bottlehead.html

 

and here:

 

http://www.head-fi.org/t/410326/for-6as7g-tube-rollers-here/1350#post_10625059

 

From the pictures, it is difficult to see the difference between graphite and metal, but up close, graphite plates appear to be carved out of a solid block of material and look rather different than formed sheet metal.

post #6589 of 10509
Quote:
Originally Posted by mordy View Post
 

Hi hypnos 1,

 

When I said talking/shouting I meant literally. I listen to classic jazz from the twenties and New Orleans Jazz, and it is not unusual that a musician will talk to another one or even shout something while performing, especially during a live recording. However, with these tubes I heard things I did not notice before.

 

How can I tell a graphite tube from a regular one? I have six different RCA 6080's, and only one real pair. The construction in five of them is slightly different from tube to tube.

 

Hi i lovemusic 2,

 

I am certainly willing to try three 6080's or two + the 6AS7. I hope that the third voltage regulator which is rated 2-3A is powerful enough.

 You should get one 12A regulator so at least you can run higher current tubes without worries for regulator.My favourite set up is two RCA 6AS7G and one G.T.C./Chatham 6AS7G this set up gave plenty of Bass my DT880 600 Ohms love this set up but not so much for my Q7X1 it's boomy however i don't want to run this set up no longer than 1.5 hours due to heat issue i've tried the fan thingy and IMO did not make that much deference.

post #6590 of 10509
Mmmmm Graphite Plates. smily_headphones1.gif

02.jpg
post #6591 of 10509

No offense they maybe shiny and expensive but i prefer the look of the 6AS7G's(coke bottle) unless they make a gigantic curvy bottle  tubes with tons of pencil leads in it.:biggrin: 

post #6592 of 10509

Thanks all for elucidating me on graphite tubes. One thing is sure - I ain't got any!

 

Regarding the 12A voltage regulator: Is one enough to drive three 6080s? Could u provide a link?

 

Re the fan: First I used a 3" fan that helped somewhat but was not adequate. Afterwards I installed a 4" fan close above the amp and the tubes, pulling away the air. Then I moved out the piece of wood that houses the voltage regulators from resting on the transformer housing. At this point the temperature dropped from hot to slightly warm, and I have no concern running the amp for extended hours. Perhaps the placement of the fan and the location of the amp has to be taken into consideration. It also helps to keep the room cool at 73F or so.

post #6593 of 10509
Quote:
Originally Posted by i luvmusic 2 View Post
 

No offense they maybe shiny and expensive but i prefer the look of the 6AS7G's(coke bottle) unless they make a gigantic curvy bottle  tubes with tons of pencil leads in it.:biggrin: 


Sorry but the KR T-1610 trumps any ST tube by a mile... :D

*

post #6594 of 10509
KR T-1610
MATCHED PAIR  $2499.00
The T-1610 is an ultra-linear, low frequency, high power triode tube capable of producing 22-45 watts of pure class-A power. The T-1610 is an exceptional tube for those special applications requiring 50 watts or more of class-A power. Recommended for new designs only. There is no other tube currently in production like Kronzilla, the T-1610 power tube. There may be bigger transmitting tubes that one can convert to audio operation, but the T-1610 is a true triode designed specifically by KR Audio for audio use.  All KR Enterprise tubes are warranted for a period of 2 years.

 

Doesn't look like I could use it in the LD amp .....

post #6595 of 10509

Hi i luvmusic 2,

 

Tried your suggestion of using 6080/6AS7 tubes. Cobbled together another voltage regulator PS with my old 2-3A voltage regulator. Here is a picture of the experimental set up:

 

After some trial and error and a dead right channel with large hum I got everything to work, sort of. The sound is OK, but not as good as my previous set up, and I miss the sound of the 6832.  The volume on the LD has to be full tilt because of the low amplification factor. The entire set up was very quiet, maybe because of the low amplification factor.

 

Keeping a watchful eye on the nixie readout on the 2A regulator, I noticed that the voltage kept on dropping slowly. When I touched the microchip above the first number it was burning hot. If I understood the information correctly that came with the regulator, 3A operation requires a heat sink on top of the microchip, but it did not come with it, unlike the 5A voltage regulators. There is some kind of overload protection, but I didn't want to take a chance, and pulled the plug.

 

I'm glad I tried, but now I am going back to my previous set up.

 

What's next? Just plugged in everything again, and listened to a recording that I have heard numerous times over several decades (4). Guess what? I heard something new that I did not notice before - this fantastic resolution of micro details is astounding......Add to this that the presentation is completely natural and musical, and not analytical with any kind of etched quality.


Edited by mordy - 6/18/14 at 12:49pm
post #6596 of 10509

I just purchased the CRACK with SB sorry for my wallet tho..........:(

Wish me luck building this kit i might screw it up like what i did with those regulators.

post #6597 of 10509
Quote:
Originally Posted by i luvmusic 2 View Post
 

I just purchased the CRACK with SB sorry for my wallet tho..........:(

Wish me luck building this kit i might screw it up like what i did with those regulators.

 

Have fun! Personally, I think it is a great little amp. And in fact, it was at the top of my list until I found out that it was not recommended for headphones with an impedance of less than 200 ohms. Too bad..... :(

post #6598 of 10509
Quote:
Originally Posted by i luvmusic 2 View Post

I just purchased the CRACK with SB sorry for my wallet tho..........frown.gif
Wish me luck building this kit i might screw it up like what i did with those regulators.
Congratz!

If you screw it up just pop it in the mail and I'll fix it for you... It might take quite a bit of audition time before its all good to ship back though... wink.gif

Seriously if you need any help just PM me instead of messages here since they would be OT and might make the others a little jealous, all except for "Mista Woo" of course since he has a WA2. biggrin.gifbiggrin.gif
post #6599 of 10509
Quote:
Originally Posted by gibosi View Post
 

 

Have fun! Personally, I think it is a great little amp. And in fact, it was at the top of my list until I found out that it was not recommended for headphones with an impedance of less than 200 ohms. Too bad..... :(

It took me awhile to decide what i really want to do build my own vs the crack i choose the CRACK due to it's price range.Thanks!

Quote:
Originally Posted by TrollDragon View Post


Congratz!

If you screw it up just pop it in the mail and I'll fix it for you... It might take quite a bit of audition time before its all good to ship back though... wink.gif

Seriously if you need any help just PM me instead of messages here since they would be OT and might make the others a little jealous, all except for "Mista Woo" of course since he has a WA2. biggrin.gifbiggrin.gif

For sure you will get a lot of PM from me once the CRACK arrived.Thanks!

post #6600 of 10509
Quote:
Originally Posted by TrollDragon View Post


Congratz!

If you screw it up just pop it in the mail and I'll fix it for you... It might take quite a bit of audition time before its all good to ship back though... wink.gif

Seriously if you need any help just PM me instead of messages here since they would be OT and might make the others a little jealous, all except for "Mista Woo" of course since he has a WA2. biggrin.gifbiggrin.gif

You called !


Edited by MIKELAP - 6/19/14 at 3:54pm
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