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Little Dot Tube Amps: Vacuum Tube Rolling Guide - Page 300

post #4486 of 10501

 

Got tired of ugly wires...

post #4487 of 10501

Received a few 8CG7 today. The one on the left appears to be an older RCA with a side D-getter, even though it has the "Micro" label. I think the one in the middle is Japanese, and the one on the right is dated 7022 Japan, so no doubt about that. None of these have a shield. That is, pin 9 is not connected to anything. Evidently, some of these *CG7 tubes have shields and some don't. Those with shields are often described as having "3 Plates" by vendors. My Raytheon 6CG7, which sounds extremely good by the way, does have a shield.

 

Anyway, I dialed in 8.4 volts, fired them up and they all light up and play. I only paid about $7.00 for these as I just wanted an excuse to adjust my DC heater voltage. lol  Will spend a little more time with them, but don't expect much. 

 

post #4488 of 10501

Hi All,

 

At the present time I am exploring different 6SL7 tubes. However, first I want to say that I have been listening to a bunch of tubes from the 6DJ8 family, mainly different brands of 6BC8/6BZ8, 6BZ7 and 6N23P tubes. The amazing thing is that all of them are very good, with the trademark etched detailing of sound, wide sound stage and good bass and treble. The only con is that they are a little cold and analytical, but not in an irritating way; just the way they are, in a pleasant "intellectual" way. These variants probably offer almost all of the sound of the very expensive Amperex tubes at a fraction of the price.

 

Now back to the 6SL7 tubes: In contrast to the 6DJ8 family these tubes are warm and musical. Some of them lack in the detail but it is made up by the musicality and heft in the bass that can go very low with some of these tubes. My favorite right now is this 6SL7GT Tung Sol tube from July 1967:

 

 

This tube has a very sweet, warm sound, excellent imaging with great bass and mid range. What stands out is a fat mid bass. The treble is not sizzling, but still very good and satisfying. The slam and attack is lesser and slower than the 6BC8 tubes, but as said before, this tube makes it up with it's musicality.

 

The tube is shown in action mounted to a breadboard wired for a 12AX7 tube with an octal adapter. The multi colored wires come from a discarded computer power supply.

 

I realize that some people on this forum are intimidated by the thought of making up adapters to fit tubes that were not originally intended for the Little Dot amps. Personally, I was myself very hesitant to fiddle with the electronic stuff since I do not have any background in this. However, once you decide to try it is not that difficult, especially with the excellent wiring diagrams provided by the esteemed members of this thread.

 

If there is an interest, I would show in pictures how to put together an adapter using a 9 pin breadboard socket and Vector adapters for those who are new to tube rolling and want to use non native tubes in the Little Dot MKIII amp. As I learned through Gibosi, this can be done without the use of a soldering iron.

 

Happy tube rolling and listening!

post #4489 of 10501
Quote:
Originally Posted by gibosi View Post
 

 

The best op amp I have found so far is the MUSES 02.

THANK YOU!

can't wait for my LD 1 i just ordered it yesterday when it arrive i may do some octal tube rolling if i have the guts and know how...

post #4490 of 10501

Well another milestone  weve just it page 300 time flies !

post #4491 of 10501
Quote:
Originally Posted by mordy View Post
I realize that some people on this forum are intimidated by the thought of making up adapters to fit tubes that were not originally intended for the Little Dot amps. Personally, I was myself very hesitant to fiddle with the electronic stuff since I do not have any background in this. However, once you decide to try it is not that difficult, especially with the excellent wiring diagrams provided by the esteemed members of this thread.

 

If there is an interest, I would show in pictures how to put together an adapter using a 9 pin breadboard socket and Vector adapters for those who are new to tube rolling and want to use non native tubes in the Little Dot MKIII amp. As I learned through Gibosi, this can be done without the use of a soldering iron.

 

Indeed, it would just be too much of a shame for people not to try the 6DJ8 (and other) types just because they're afraid of making/crafting an adapter. It really isn't that hard once you get the diagrams down, and you've got metric tons of help here on this thread, so go for it and roll yourself some double triodes this Christmas, or whatever holiday you prefer!

:beerchug:

 

Page 300 huh? Wow, it was like page 30 something the first time I posted here... Time flies when you having fun lol.

post #4492 of 10501
Quote:
Originally Posted by mordy View Post
 

Hi All,

 

At the present time I am exploring different 6SL7 tubes. However, first I want to say that I have been listening to a bunch of tubes from the 6DJ8 family, mainly different brands of 6BC8/6BZ8, 6BZ7 and 6N23P tubes. The amazing thing is that all of them are very good, with the trademark etched detailing of sound, wide sound stage and good bass and treble. The only con is that they are a little cold and analytical, but not in an irritating way; just the way they are, in a pleasant "intellectual" way. These variants probably offer almost all of the sound of the very expensive Amperex tubes at a fraction of the price.

 

Now back to the 6SL7 tubes: In contrast to the 6DJ8 family these tubes are warm and musical. Some of them lack in the detail but it is made up by the musicality and heft in the bass that can go very low with some of these tubes. My favorite right now is this 6SL7GT Tung Sol tube from July 1967:

 

 

This tube has a very sweet, warm sound, excellent imaging with great bass and mid range. What stands out is a fat mid bass. The treble is not sizzling, but still very good and satisfying. The slam and attack is lesser and slower than the 6BC8 tubes, but as said before, this tube makes it up with it's musicality.

 

The tube is shown in action mounted to a breadboard wired for a 12AX7 tube with an octal adapter. The multi colored wires come from a discarded computer power supply.

 

I realize that some people on this forum are intimidated by the thought of making up adapters to fit tubes that were not originally intended for the Little Dot amps. Personally, I was myself very hesitant to fiddle with the electronic stuff since I do not have any background in this. However, once you decide to try it is not that difficult, especially with the excellent wiring diagrams provided by the esteemed members of this thread.

 

If there is an interest, I would show in pictures how to put together an adapter using a 9 pin breadboard socket and Vector adapters for those who are new to tube rolling and want to use non native tubes in the Little Dot MKIII amp. As I learned through Gibosi, this can be done without the use of a soldering iron.

 

Happy tube rolling and listening!

Hi, i am interested in making the adaptor(for the tube in the picture) please let me know what are the materials  i need and if you can show the diagram i have the VECTOR 7 Pin adaptor. Thanks!


Edited by i luvmusic 2 - 12/27/13 at 1:16pm
post #4493 of 10501

Speaking of adapters i started to put together an adaptor for octal tubes since my chinese adapters are probably lost ,using  Troll Dragon's  design and Artsi's schematics here's the  12AX7 an 6DJ8 adapters i made heres a few pictures the 6SL7 octal adapter is more elaborate since theres cutting and soldering i would say just for the chassis i will probably put in a couple hours since i have to open up the diameter where the octal socket goes in the tube .as for the rest the parts used will be like the other adapters                                                                                                                                                                                                                                                                                                                 

 

 

 


Edited by MIKELAP - 12/27/13 at 2:24pm
post #4494 of 10501
Quote:
Originally Posted by MIKELAP View Post
 

Speaking of adapters i started to put together an adaptor for octal tubes since my chinese adapters are probably lost ,using  Troll Dragon's  design and Artsi's schematics here's the  12AX7 an 6DJ8 adapters i made heres a few pictures the 6SL7 octal adapter is more elaborate since theres cutting and soldering i would say just for the chassis i will probably put in a couple hours since i have to open up the diameter where the octal socket goes in the tube .as for the rest the parts used will be like the other adapters                                                                                                                                                                                                                                                                                                                 

 

 

 

 

Quote:
Originally Posted by MIKELAP View Post
 

Speaking of adapters i started to put together an adaptor for octal tubes since my chinese adapters are probably lost ,using  Troll Dragon's  design and Artsi's schematics here's the  12AX7 an 6DJ8 adapters i made heres a few pictures the 6SL7 octal adapter is more elaborate since theres cutting and soldering i would say just for the chassis i will probably put in a couple hours since i have to open up the diameter where the octal socket goes in the tube .as for the rest the parts used will be like the other adapters                                                                                                                                                                                                                                                                                                                 

 

 

 

That is nice, what gauge is that wire you are using(solid and the stranded)?


Edited by i luvmusic 2 - 12/27/13 at 2:46pm
post #4495 of 10501
Quote:
Originally Posted by i luvmusic 2 View Post
 

 

That is nice, what gauge is that wire you are using(solid and the stranded)?

22 gauge stranded copper wire for the connections and 1 m.m.(.039) copper wire for the pins

post #4496 of 10501
Quote:
Originally Posted by MIKELAP View Post
 

22 gauge stranded copper wire for the connections and 1 m.m.(.039) copper wire for the pins

THANK YOU!

post #4497 of 10501
Quote:
Originally Posted by MIKELAP View Post
 

Speaking of adapters i started to put together an adaptor for octal tubes since my chinese adapters are probably lost ,using  Troll Dragon's  design and Artsi's schematics here's the  12AX7 an 6DJ8 adapters i made heres a few pictures the 6SL7 octal adapter is more elaborate since theres cutting and soldering i would say just for the chassis i will probably put in a couple hours since i have to open up the diameter where the octal socket goes in the tube .as for the rest the parts used will be like the other adapters.

 

Nice Job on those adapters!

post #4498 of 10501

My late 1950 (or early 1960) US-made Raytheon 6CG7 with black plates is fast becoming one of my favorite tubes. It is slightly warmer than the Amperex and Voshkod 6DJ8-types, with excellent liquidity and flow, and a spacious 3D stage with very good depth and detail. But what really separates this tube from the 6DJ8 is the midrange. Vocals are slightly forward and crystal clear, but never stridant, and as a result, I am hearing more mid-range detail with this tube than with the 6DJ8. Highly recommended.

 

In the second photo, you can clearly see the shield in between the two triode plates. Some vendors describe such a 6CG7 as having three plates. Also, this tube is taller than a standard 6DJ8. 

 

 

post #4499 of 10501

I got my DC regulator all wired up and tucked safely inside my enclosure, the little bit of hum I had is now 100% gone... makes these tubes seem more dynamic (Amperex A frames) probably due to having a completely black image on quieter passages... now I just have to figure out how to mount the DC regulator and cut holes so it is accessible/visible from the front.

post #4500 of 10501

Hi kvtaco 17,

 

When you figured out how to mount it, could you please post pictures -thanks

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