6AS7G ,   L63

339 is driven by DC capacitance with AC slot. If you unplug the tubes when the machine is working. Your earphones will be damaged. The burning of the tubes will never damage the machine. Please do check the earphones first.

The upgraded 339 drives the PS1000.        

  customers indoor use 339 to drive d5000(25 ohm),it does well,too.  

Quote: MANY TUBES HAVE THIS CONDITION, YOU NEED USE THE TUBES FOR A LONG TIME,USUALLY,YOU CAN RESOLVE THIS PROBLEM.      

  Quote: 332C can drive 600 ohm ，but it's better to run 250 ohm.  

  Quote:  339 is $500.

  Quote:  339 can change tube to: 6N13P changes to 6080.6AS7G. 5998. OTK6米4 changes to 6J8.  6J4.  5693.EBC3.

Because the user's space is relatively small he has to chose 332C to run his HD650,he asks me to upgrade it, according to user's requirements I make the upgrading scheme. 1 all electrolytic change to BC. 2 the output capacitance increases 1 time. 3 the 6J1 changes to 5725. After the...

Quote: I have to give you an explanation, the initial products of  Dark Voice and now the Figaro products are all designed by a same designer ,see the signature. Because of  the separating of the fore company, we have to chang the trademark to Figaro,we redesign the...

332S is a group of power provide  2 channels ，339 has 2 groups of power provide each channels,they are completely independent,the separating degree,the detail and the strength of LRC are all better than 332S.  

I redesigned the new machine 339 in order to further improve 337. The output capacitance of 337 series machines is only 50μF but 339 is 130μF, so 339 have more strength in the bass, the structure of 339 is more reasonable,the pipe is on the front,far from the the transformer  avoiding the...

Quote:       The purpose of separately adjustment is that making a fuzzy model adapt to the ears, or recording the imbalance of level. To adjust, parted, is never put on both sides of the potentiometer exactly the same scale adjustment, but the balance sense of ears.  

Quote: Darkvoice an lafigaro used to be Colleague.

Quote: Yes,DV and LA is diffrent company.Voltage is set in the lab.