Head-Fi.org › Forums › Equipment Forums › Headphone Amps (full-size) › Little Dot Tube Amps: Vacuum Tube Rolling Guide
New Posts  All Forums:Forum Nav:

Little Dot Tube Amps: Vacuum Tube Rolling Guide - Page 263

post #3931 of 7994
Quote:
Originally Posted by Artsi View Post

Here is a good text about 6SL7 and 6SN7 tubes.
http://boneshifi.blogspot.fi/2013/07/the-6sl7-and-6sn7-family-of-tubes.html

The link is blocked at my school, i'll have to wait till I get home. :( 

 

Oh, never mind, I don't think this post was directed towards me. 


Edited by Sony Slave - 11/11/13 at 7:34am
post #3932 of 7994

Hi Artsi,

 

Thanks for the link - very useful

post #3933 of 7994
Quote:
Originally Posted by Sony Slave View Post
 

Could I just cut off the pins and set it to E92, or is it absolutely necessary to do use the adapter?

Perhaps Gibosi could show us a picture of how his Little Dot looks with the 6DJ8 tubes...

 

You do not need to set your amp to E92 to run double triodes. E95 is fine. However, you cannot just cut pins and insert them into your sockets. You need the adapters to re-route tube-pins 7 and 8 to get the grid and cathode connected.

 

There have been numerous postings on how to use two 6DJ8s in the LD. I humbly suggest that you learn how to search this forum:

 

Notice at the top and bottom of each page there is "Search This Thread." This is how I pulled the following links. Give it try. :)

 

http://www.head-fi.org/t/563884/little-dot-tube-amps-vacuum-tube-rolling-guide/3045#post_9830528

 

http://www.head-fi.org/t/563884/little-dot-tube-amps-vacuum-tube-rolling-guide/3135#post_9842518

 

http://www.head-fi.org/t/563884/little-dot-tube-amps-vacuum-tube-rolling-guide/3150#post_9844996

 

http://www.head-fi.org/t/563884/little-dot-tube-amps-vacuum-tube-rolling-guide/3150#post_9845096

post #3934 of 7994

Hi,

I'm planning to build a 1x6DJ8 to 2x7 pins sockets "Magic Box" adapter, as from Artsi super clear and detailed guide. Wish me luck on it, as it's my first DIY mini-project :-) (so far I'm just waiting for all sockets, boxes, wiring to arrive in my mailbox).

 

Looking at the future, if I'd like to try and roll also some 6SL7 octal tubes on the same box, can I use this 9 pin to 8 pin adapter on top of the 6DJ8 socket ?

http://www.ebay.com/itm/1-convert-tube-socket-12AX7-12AU7-to-6SL7-6SN7-9-pin-to-8-pin-/281031554093?pt=US_Amplifier_Parts_Components&hash=item416ec9342d

 

The eBay description mentions that the 8 pins are re-routed for a 12AX7 tube, but usually 12AX7 are listed as "close relatives" of the 6DJ8, so I'm just wondering if the wiring in the adapter is actually the same for 6DJ8s.

Thanks for your help.

post #3935 of 7994
Quote:
Originally Posted by vic2vic View Post
 

Hi,

I'm planning to build a 1x6DJ8 to 2x7 pins sockets "Magic Box" adapter, as from Artsi super clear and detailed guide. Wish me luck on it, as it's my first DIY mini-project :-) (so far I'm just waiting for all sockets, boxes, wiring to arrive in my mailbox).

 

Looking at the future, if I'd like to try and roll also some 6SL7 octal tubes on the same box, can I use this 9 pin to 8 pin adapter on top of the 6DJ8 socket ?

http://www.ebay.com/itm/1-convert-tube-socket-12AX7-12AU7-to-6SL7-6SN7-9-pin-to-8-pin-/281031554093?pt=US_Amplifier_Parts_Components&hash=item416ec9342d

 

The eBay description mentions that the 8 pins are re-routed for a 12AX7 tube, but usually 12AX7 are listed as "close relatives" of the 6DJ8, so I'm just wondering if the wiring in the adapter is actually the same for 6DJ8s.

Thanks for your help.

 

I assume that adapter will work. However, I bought my adapter from a different eBay vendor:

 

http://www.ebay.com/itm/320659633166?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649

 

And yes, this adapter converts 6SL7 to 12AX7. The wiring of the heaters is different for 6DJ8 and 12AX7, but if you build the version of the magic box with the switch, then this adapter will do the trick. Just flip the switch to the 12AX7 position and you are good to go.

post #3936 of 7994

Hi Gibosi,

 

I am intrigued by Artsi's octal three tube set-up (alternative upgrade of MKIII to MK9?). Two questions:

 

Is there available an adapter from 6SN7 to 6N6P? (Have not been able to find it)

 

Assuming that there is such a thing available, would it fit on top of the 6N6P sockets with the octal tubes in place?

post #3937 of 7994
Quote:
Originally Posted by mordy View Post

Hi Gibosi,


I am intrigued by Artsi's octal three tube set-up (alternative upgrade of MKIII to MK9?). Two questions:


Is there available an adapter from 6SN7 to 6N6P? (Have not been able to find it)


Assuming that there is such a thing available, would it fit on top of the 6N6P sockets with the octal tubes in place?


 


You mean adapter like this.
www.ebay.com/itm/two-Adapters-for-ECC32-6SN7-plug-adapters-to-instead-6N6P-tubes-/261051244115

My guess is that adapter diameter is about 32mm.
Edited by Artsi - 11/11/13 at 10:09am
post #3938 of 7994

Hi Oskari,

 

 

Ouch, wish it was Taiwanese dollars which would be around $2 USD. But yes, these are them, but too expensive to pay $62 for two.

 

I bet that you could make them and throw in two tubes for much less!

 

What makes the 6SN7 into power tubes over the 6SL7 tubes? Can they be used reversely?

post #3939 of 7994

Hi Artsi,

 

can you do a wiring diagramm for your 6SN7 to 6N6P tube like you did with the 6DJ8 adaptor?

 

Before making only the box for the 6DJ8 tube I want to integrate the adaptors for the octal powertubes. This box will be made of ebony wood and I don't have enough for 2 boxes :(

 

Thanks

post #3940 of 7994
I'm posting a copy of my LD1+ thread here since there's more activity here. I'm planning to purchase HE-500's and need a amp so I am looking at the LD1+. My music is mostly bebop-jazz, Latin jazz, fusion, acid jazz and ballad r&b. All recommendations much appreciated 😎!

(Copy)
New to the LD 1+ need help understanding what I'm reading. Based on the forums it sounds like these options will work best with my HE-500 phones.

Please review the below items to confirm they'll work with the LD1+ and what else will be required?

LT1364CN LT1364CN8 DIP8 Dual and Quad 70MHz, 1000V/us Op Amps
lxr0000527 LT1364CN8 DIP8

New Burr-Brown OPA2107AP DIP-8
Precision Dual Difet(R) Operational Amplifier

2x Voshod 6ZH1P-EV

2x Mullard M8161/CV401

I think these upgrades will give me neutral and warm options to roll in and out?

I'm confused with the opamp usage more than the tubes since I've read some saying adapters needed for dual opamps replacement??

Thanks guys
post #3941 of 7994

Any feedback from HE-500 users using LD amps would be great!!!!!

post #3942 of 7994
Quote:
Originally Posted by SwanSong View Post

LT1364CN LT1364CN8 DIP8 Dual and Quad 70MHz, 1000V/us Op Amps
lxr0000527 LT1364CN8 DIP8

New Burr-Brown OPA2107AP DIP-8
Precision Dual Difet(R) Operational Amplifier

2x Voshod 6ZH1P-EV

2x Mullard M8161/CV401

I think these upgrades will give me neutral and warm options to roll in and out?

I'm confused with the opamp usage more than the tubes since I've read some saying adapters needed for dual opamps replacement??
 

 

Generally, op amps are cheap, so I suggest you simply try them all to see which you like best. And if you would like to try a couple more, the MUSES02 and the LME49990 are also very good. Currently the MUSES02 is my op amp of choice, but unfortunately, it is not as cheap as the others.

 

The tubes you have chosen are among the best of the "traditional" tubes, but I would also suggest that you consider getting a pair of 6DT6 (RCA and Sylvania are popular) and 6HM5 (GE, EI and Sylvania - avoid the short squat tubes - get the taller tubes).

 

I don't have the HE-500 (my HE-300 has dynamic drivers) so I can't help you there....

post #3943 of 7994
Quote:
Originally Posted by gibosi View Post
 

 

Generally, op amps are cheap, so I suggest you simply try them all to see which you like best. And if you would like to try a couple more, the MUSES02 and the LME49990 are also very good. Currently the MUSES02 is my op amp of choice, but unfortunately, it is not as cheap as the others.

 

The tubes you have chosen are among the best of the "traditional" tubes, but I would also suggest that you consider getting a pair of 6DT6 (RCA and Sylvania are popular) and 6HM5 (GE, EI and Sylvania - avoid the short squat tubes - get the taller tubes).

 

I don't have the HE-500 (my HE-300 has dynamic drivers) so I can't help you there....

Thanks gibosi,

The opamps I listed are they direct replacements for the stock opamp (1 to1) ?  I read other opamp suggestions required adapters for dual opamp configuration?

These opamps are both about $15 shipped on ebay is that a good price?  The Voshod matched pair i found on Yen audio ebay page for $36 shipped.  The Mullard's I couldnt find on ebay but found elsewhere for $60 shipped and match tested.  I'm just wondering if these are ok prices?

 

Thanks again


Edited by SwanSong - 11/11/13 at 2:19pm
post #3944 of 7994
Quote:
Originally Posted by SwanSong View Post
 

Thanks gibosi,

The opamps I listed are they direct replacements for the stock opamp (1 to1) ?  I read other opamp suggestions required adapters for dual opamp configuration?

These opamps are both about $15 shipped on ebay is that a good price?  The Voshod matched pair i found on Yen audio ebay page for $36 shipped.  The Mullard's I couldnt find on ebay but found elsewhere for $60 shipped and match tested.  I'm just wondering if these are ok prices?

 

Thanks again

 

You can get the OPA2107 for FREE (inc shipping) from Texas Instruments.  Register on their website and request a sample (ask for two, just in case because the pins are a little fragile).  Dip 8 opamps require no adapters (SOIC opamps do require adapters).

post #3945 of 7994

these voskhods are way cheaper:

 

http://www.ebay.de/itm/130436695928?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

 

but don´t buy all.I got them recently and they already sound good with no burn-in so i´m getting a second pair tomorrow!

New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Headphone Amps (full-size)
Head-Fi.org › Forums › Equipment Forums › Headphone Amps (full-size) › Little Dot Tube Amps: Vacuum Tube Rolling Guide