Head-Fi.org › Forums › Equipment Forums › Headphone Amps (full-size) › Dark Voice 339
New Posts  All Forums:Forum Nav:

Dark Voice 339 - Page 105

post #1561 of 2404
Quote:
Originally Posted by xmdkq View Post

 

 

To improve the reliability of the machine, to further improve the voice.
 

Those improvements..are they also possible on a 337?

post #1562 of 2404

CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 80

 

337 is my old product, the space is not allowed

post #1563 of 2404
Quote:
Originally Posted by xmdkq View Post

CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 80

 

337 is my old product, the space is not allowed

 

Are you the owner of Darkvoice?  These are GREAT amps, you really deserve a round of applause for making these great sounding amps for us all to enjoy.  I Love my 337, with tung sol 5998 and mesh screen valves.

 

Amazing amps, and outstanding dollar value too.

post #1564 of 2404
Quote:
Originally Posted by kramer5150 View Post

 

Are you the owner of Darkvoice?  These are GREAT amps, you really deserve a round of applause for making these great sounding amps for us all to enjoy.  I Love my 337, with tung sol 5998 and mesh screen valves.

 

Amazing amps, and outstanding dollar value too.

Yeah..my 337 has ts 5998 and ts as7gt mesh plates also..perfect!!

post #1565 of 2404

I will not English, all is GOOgle translation, don't know if you can read?

post #1566 of 2404

Your English is very good through translator.

 

I use google translator when I read your Chinese headphone forums... seems to work very well.

 

thank you for building excellent amps.

post #1567 of 2404
Quote:
Originally Posted by xmdkq View Post

I will not English, all is GOOgle translation, don't know if you can read?

We understand u..no need to worry. Good to have you here.

post #1568 of 2404
Quote:
Originally Posted by snip3r77 View Post

I believe the correct terminology is CCS ( Constant Current Source ).

How much does the White Box costs?

CCS requires an external voltage source, and as you see there is not, the white box is connected the same way as the cathode bias resistor BTW CCS is belong to fixed bias group

post #1569 of 2404
Quote:
Originally Posted by hifimanrookie View Post

We understand u..no need to worry. Good to have you here.

I have the opportunity to come to the United States and yuking

post #1570 of 2404

My old 337 MOD

 

 

CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 80

 

337 MOD RMAA

 

 

 

 

 

                  (Upgarde)

 

 

 

My 339 Reference (Before)

 

 

 

 

339 Reference RMAA (Before)

 

 

 

339 Reference Frequency Response 2496 (Before)

 

 

 

339 Reference Stereo Crosstalk 2496 (Before)

 

 

 

 

 

Resistors, Diodes, RCA Sockets and Circuit were different, the other parts no changed.

 

THD and IMD, LF339 is less than half as DV337!!

 

I think the reason is for the circuit, LF339 is more concise than DV337.

 

If some people don't know what's difference with them, maybe the post is useful.

 

post #1571 of 2404

I wish my 337 had the inside of ur old 337 project..my god.that piece would have sound goodwink.gif

post #1572 of 2404
Quote:
Originally Posted by hifimanrookie View Post

I wish my 337 had the inside of ur old 337 project..my god.that piece would have sound goodwink.gif

 

339 is more potential platform.biggrin.gif

 

339 Reference make me don't want to sleeping, really very good sound.o2smile.gif

post #1573 of 2404
Quote:
Originally Posted by WALL-E View Post

 

The "white box" could be called Fixed Bias, all the current version of lf339 is using fixed bias method in the cathode circuit.
I bought my amp before it so my amp was self biased, if I got one definitely I would open it and check it out.biggrin.gif

 

I bias the input stage tubes with resistor,  RC bypass, LED and finally with the rechargeable cell. The first two methods are self biased the LED and the rechargeable battery is fixed bias.The advantage of the RC bypass, LED or battery over a resistor is that the stage will have higher gain.

All the method sound better then cathode resistor itself I'm still impressed with the sound LED biased cathodes or RC bypass but none have come close to the difference of putting a battery for cathode bias. Battery bias kept the dramatic improvement in the bass and improve the presentation in the mid and upper range.

 

BTW, very nice shot I hope, u get the adapters working soon :))) and do some picture, ceramic base and teflon socket it may look cool!

 

Thanks for the info man, I remember at the time I was upgrading I switch this white box for a 1K resistor and I immediately felt the sound had degraded.

 

I'm sorry I couldn't help you more about discovering whats Inside, but I couldn't open this box and only found that theres a resistance of exactly 1Kohm between the lugs (if memory serves). No voltage so I presume it's not a battery.

 

I strongly suggest you try to upgrade you DK339 to fixed bias, the improvement is not that subtle to my ears!

 

Im waiting for the parts to arrive, hope the ceramic base are well made ^^ , and the Tungsol 6SJ7GT will sing again!

 

I will try to run measurements with the programs you mentionned, is it hard to do?

 

My amp was modified a little bit since, I use russian gigantic teflon caps and paper in oïl for the output coupling bypass and the sound is very good. Anyway, anyone with any variants of the 339 will tell you this amp sounds good hehe ^^!


Edited by telecaster - 3/15/13 at 1:10pm
post #1574 of 2404
Quote:
Originally Posted by kanshouhin View Post

 

339 is more potential platform.biggrin.gif

 

339 Reference make me don't want to sleeping, really very good sound.o2smile.gif

 

I totally agree! This amp was such fun to upgrade, the base circuit is beautifully sounding to begin with! Thanks for your reference amp that helped us a lot in modding our own amp. Kudos to you and the Boss!

post #1575 of 2404

 

Holy capacitance batman!! (American expression, from an old TV series).

I thought about doing something similar to my 337, I would have had to add an entire bottom chassis (metal enclosure) beneath the amp just to house the coupling capacitors.  I would have needed ~250-300mfd at ~400-450V.  It just wasn't practical.  I could have used low-ESR electrolytic too, electrolytic capacitors are less than half the volume for equal specs.  I chose to add an output transformer instead, happy with the result... GREAT sounding amp!! 


Edited by kramer5150 - 3/15/13 at 1:26pm
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) › Dark Voice 339