[GermanGuy]

Hey ianmedium, you said that the mullard dl92's are the exact same thing as the philips miniwatt dl92's right?
 
So would these be ok?
 
http://www.ebay.com/itm/DL92-N17-3S4-1P10-MULLARD-EVEREADY-OTHERS-NEW-OLD-STOCK-VALVE-TUBE-J13-/370833952317?pt=UK_Sound_Vision_Valves_Vacuum_Tubes&hash=item56576d0e3d
 
http://www.ebay.com/itm/3S4-DL92-CV820-MULLARD-NOS-/260765283638?pt=UK_Sound_Vision_Valves_Vacuum_Tubes&hash=item3cb6d27536

 


the second link is exactly where i bought my mullards.

 

[zachchen1996]

 

  Hey ianmedium, you said that the mullard dl92's are the exact same thing as the philips miniwatt dl92's right?
 
So would these be ok?
 
http://www.ebay.com/itm/DL92-N17-3S4-1P10-MULLARD-EVEREADY-OTHERS-NEW-OLD-STOCK-VALVE-TUBE-J13-/370833952317?pt=UK_Sound_Vision_Valves_Vacuum_Tubes&hash=item56576d0e3d
 
http://www.ebay.com/itm/3S4-DL92-CV820-MULLARD-NOS-/260765283638?pt=UK_Sound_Vision_Valves_Vacuum_Tubes&hash=item3cb6d27536

 


the second link is exactly where i bought my mullards.

 
Thanks, just ordered a pair. More bass is probably a good thing anyways

 

[ianmedium]

Remember, lots of burn in, at least twenty hours will see them really open up!

 

[zachchen1996]

Remember, lots of burn in, at least twenty hours will see them really open up!

 
How long of burn in does the tu-05 and tubes have to go through for them to open up all the way? 100 hrs? Also don't tube amps need at least an hour after turning them on for them to fully warm up and sound their best?

 

[ianmedium]

I find things get really better after twenty hours and improve a little more after that but not as much. This amp needs less warm up but I have a routine which has proved to be really valuable.
First I switch on the amp and allow the tubes to settle for a minute. Then I play music for about twenty minutes before listening properly. I find that way I am listening at the highest quality as everything comes together after about twenty minutes in my experience.

 

[zachchen1996]

I find things get really better after twenty hours and improve a little more after that but not as much. This amp needs less warm up but I have a routine which has proved to be really valuable.
First I switch on the amp and allow the tubes to settle for a minute. Then I play music for about twenty minutes before listening properly. I find that way I am listening at the highest quality as everything comes together after about twenty minutes in my experience.

 
Thanks, when you use sensitive iems with the tu-05, is there hiss? Or is the blackground black? Because I absolutely hate hiss in the background xp

 

[ianmedium]

I have never heard hiss. In fact it is one of the most extraordinary things about this amp. It is not just quiet for a tube amp but simply quiet all together. The only hiss you will hear is from the master tape on older recordings!

 

[zachchen1996]

I have never heard hiss. In fact it is one of the most extraordinary things about this amp. It is not just quiet for a tube amp but simply quiet all together. The only hiss you will hear is from the master tape on older recordings!

 
Whew! That's a relief hahaha. Is it bad for the amp to leave the amp on constantly 24/7 while being plugged into a power outlet?

 

[GermanGuy]

this amp is so dead silent that the first days when there was a longer gap between two tracks i automatically looked if the colorfly c4 were out of power.
 
the amp is really dead silent, absolutely no hiss to hear with akg k3003, fad pf viii, even with the very sensitive ue tf10, nothing.

always connected to power is not the best condition for the internal battery, always on also for the tubes makes no sense.

 

[ianmedium]

As GG says it is not good to leave the amp plugged into the power socket. In fact Shikada San is very keen on these instructions.

Don't leave the amp plugged in to the mains once the battery has reached full charge. The only time it is OK to do so is when listening to music but I think he prefers the amp used on battery power only.

Also, try not to let the battery drain completely, he says it shortens the life of the battery. If the battery should drain completely it may trip the safety circuit so if your amp appears to be dead then simply plug it in and charge the batteries. By doing so you re set the trip switch.

 

[zachchen1996]

The siemens df91's are here! The pins on the bottom are a bit dirty, what's the best way to clean them?
 

 

 

 

 

 

[ianmedium]

Oh thats great. GG has devised a great way of cleaning pins. I have one of his kits so will give it a try soon but in the meantime here is a link to my photo tutorial of the way I developed. It is more labour intensive but I find it oddly therapeutic!

http://www.head-fi.org/t/632518/analog-paper-2-discussion-and-appreciation-thread/165#post_9305627

 

[GermanGuy]

tube cleaning kit:

http://www.head-fi.org/t/632518/analog-paper-2-discussion-and-appreciation-thread/630#post_9573905

distribution:

http://www.head-fi.org/t/632518/analog-paper-2-discussion-and-appreciation-thread/1245#post_9649904

woodcans takes care of the US distribution. each cleaning kit includes a 'how to use' description.

 

[GermanGuy]

ianmedium - i am very interested in your results with that garnet powder. i tried a powder made to clean stainless steel but it did not work very well because the powder is too fine to apply enough friction force to the pins, the sand saturated with alcohole worked much better.
 
so hope the garnet powder is best of two worlds with the cleaning power of sand but finer particles so better polishing the pins.

 

[GermanGuy]

just had the idea to use a mortar and a pestle to get much finer sand:
 


and used this now very fine sand to clean the pins of two tubes with really dirty pins (tungsram 1s4).
 
here you see the cleaning result (about 90 seconds of cleaning with this sand saturated with alcohole) in comparison (uncleaned pins of tube one, cleaned pins of tube two):
 

 


and here both tubes with cleaned pins:
 


using this sand with its much smaller and finer particles the pin's surface is not only cleaned but much more even, much smaller scratches, so the garnet powder should be even better and perfect!