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Those improvements..are they also possible on a 337?
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.
Yeah..my 337 has ts 5998 and ts as7gt mesh plates also..perfect!!
I will not English, all is GOOgle translation, don't know if you can read?
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.
We understand u..no need to worry. Good to have you here.
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
I have the opportunity to come to the United States and yuking
My old 337 MOD
337 MOD RMAA
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.
I wish my 337 had the inside of ur old 337 project..my god.that piece would have sound good
339 is more potential platform.
339 Reference make me don't want to sleeping, really very good sound.
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 ^^!
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!
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!!