[OctavianH]

Noob question: Guys, do you power off your Littledots after 3-4 hours to let the tubes loose heat? Because I usually listen 8h without any pause and I am not sure if this can damage somehow the amp.

 

[jon parker]

Noob question: Guys, do you power off your Littledots after 3-4 hours to let the tubes loose heat? Because I usually listen 8h without any pause and I am not sure if this can damage somehow the amp.

In terms of Amp burn in they recommend to let the amp cool down every 24 hours so you should be fine for 8 hour sessions although they also say if you do use it for long sessions just to make sure they have plenty of air movement around the unit so perhaps best not have it on your duvet!

 

[Whelkie D]

In terms of Amp burn in they recommend to let the amp cool down every 24 hours so you should be fine for 8 hour sessions although they also say if you do use it for long sessions just to make sure they have plenty of air movement around the unit so perhaps best not have it on your duvet!

I made a cooling device using an old computer fan in a wooden box which blows air onto and around the amp via the copper tubes. this seems to keep it fairly cool even after several hours of use............

 

[mdr944]

I made a cooling device using an old computer fan in a wooden box which blows air onto and around the amp via the copper tubes. this seems to keep it fairly cool even after several hours of use............

That is a really elaborate piece of hardware you have made. BRAVO!

 

[jon parker]

That is a really elaborate piece of hardware you have made. BRAVO!

GOOD LORD!! - Ahhhhh of course, its the English 'mushroom' season. A truly magical time

 

[MIKELAP]

Well thanks both of you
I began to read this thread a few weeks ago. I am around page 100 lol.
This thread is like an Explorer mission but not in space, rather in audiophily I feel sorry I didn't join you earlier !
I am looking right now for Tung Sols 6AH6. Quite difficult to get... In comparison, do the Sylvania sound ok (years 60')?

i have 3 tungsol 6ah6 +many others 6au6,6136 that are the same type and i also have a pair of new adapters for these tubes .No longer have the amp. If your interested in these tubes let me know .

 

[Modulateur-75]

i have 3 tungsol 6ah6 +many others 6au6,6136 that are the same type and i also have a pair of new adapters for these tubes .No longer have the amp. If your interested in these tubes let me know .

Hi Mikelap,
Thanks a lot. Yes I am interested. A lot!
TS 6ah6 are not the ones with "O" getter as I can see from the pics. I don't know if I am right but it has been said that the "right" ones are the "O" getter.
The adapters won't fit in my amp (Zhilai D2). It is a good and cheap preamp. Between a Pro-ject Dac and a amp, I can clearly hear the difference with or without.
My amp is only ef95 and I can do strapping, no pb. Are the 6136 ok for the ef95 settings? They are some kind 6AU6 (mil specs?) aren't they?
I see you have Tektronix 6AU6 Do you sell some?

 

[MIKELAP]

Hi Mikelap,
Thanks a lot. Yes I am interested. A lot!
My amp is only ef95 and I can do strapping, no pb. Are the 6136 ok for the ef95 settings? Are the TS 6ah6 the ones with "O" getter?
The adapters won't fit in my amp (Zhilai D2)

The millitary TUNG SOL U.S.A.F. 6AH6WA i have are with square getters.You can use the 6AH6 tube strappIng pin 2and 7 on EF95 setting .As for the 6136 they are a 6AU6 equivalent and are used on EF95 setting with pins 2 and 7 strapped .The Tektronix 6AU6 ,i have a pair that i could let go since i dont have the amp anymore .PM me if your interested. Thanks.

 

[i luvmusic 2]

Hi Guys,Anyone remember the page where it have the list of all the compatible tubes and how to strap them.

Thanks!

 

[gibosi]

I think you mean page 77?

https://www.head-fi.org/threads/lit...ube-rolling-guide.563884/page-77#post-9392055

 

[i luvmusic 2]

I think you mean page 77?

https://www.head-fi.org/threads/lit...ube-rolling-guide.563884/page-77#post-9392055

Thank You!

 

[i luvmusic 2]

Ok so i made an adapter for the 6HM5 and 5654 to 6SN7,The 6HM5 sound darn good and for the 5654 it's ok this(5654) tube sound better on the LD MKIII.Another question how do i configure the EF91/EF92 to 6SN7?Thanks again!!

 

[gibosi]

First it is necessary to convert an EF91/EF92 into a triode. To begin strap pins 5 and 6 together as you did for the 5654. Next, strap pin 7 to either pin 5 or 6 and you will have a triode-strapped pentode. That is, both the screen grid and the suppressor grid will be strapped to the plate. After that, it is a simple matter to connect the cathode, grid 1 and plate of the two EF91/EF92 to each section of the 6SN7, in the same way as you did with the 5654.

And I am not surprised that the EF95/5654 was just OK stuffed into a 6SN7 socket. These sharp-cutoff pentodes, EF91, EF92 and EF95 are not all that comfortable in a 6SN7 socket as they require very different bias values.

Have fun!

 

[i luvmusic 2]

First it is necessary to convert an EF91/EF92 into a triode. To begin strap pins 5 and 6 together as you did for the 5654. Next, strap pin 7 to either pin 5 or 6 and you will have a triode-strapped pentode. That is, both the screen grid and the suppressor grid will be strapped to the plate. After that, it is a simple matter to connect the cathode, grid 1 and plate of the two EF91/EF92 to each section of the 6SN7, in the same way as you did with the 5654.

And I am not surprised that the EF95/5654 was just OK stuffed into a 6SN7 socket. These sharp-cutoff pentodes, EF91, EF92 and EF95 are not all that comfortable in a 6SN7 socket as they require very different bias values.

Have fun!

Thank You Very Much!

 

[i luvmusic 2]

First it is necessary to convert an EF91/EF92 into a triode. To begin strap pins 5 and 6 together as you did for the 5654. Next, strap pin 7 to either pin 5 or 6 and you will have a triode-strapped pentode. That is, both the screen grid and the suppressor grid will be strapped to the plate. After that, it is a simple matter to connect the cathode, grid 1 and plate of the two EF91/EF92 to each section of the 6SN7, in the same way as you did with the 5654.

And I am not surprised that the EF95/5654 was just OK stuffed into a 6SN7 socket. These sharp-cutoff pentodes, EF91, EF92 and EF95 are not all that comfortable in a 6SN7 socket as they require very different bias values.

Have fun!

Hi Gibosi,
In my adapter(EF95 to 6SN7)Pins 6 and 7 are shorted so i just put a Switch between Pin 5 and 6 now i can use EF91 tubes.Thanks again G!

Since i have a hard time selling all my 7 Pins tubes i use them for my DIY amp instead....