neutralzz

ultra rare meshplate NOS 6sj7gt

example? http://www.positive-feedback.com/Issue1/beltpen.htm

in this hifi hobby, with increased popularity.. and more money to be made, there are snake oil sellers all the time waiting to make a quick buck.. anyone has any experiences to share?

there are 2 versions depending on which OEM type maverick got, one is pre-amp volume variable with headphone volume, the other version, preamp volume is not controlled, only headphone volume can be controlled. the other issue is whether pre-amp out is muted when headphone jack is in, or preamp out is not muted when headphone is plugged in. i just did a factory inquiry for five sets, they call it type 1A or 2A. but i'm still considering whether its worth the trouble of arranging it to come to sg from factory straight

hmm.. just as i thought.. looks quite similar to http://www.tubebbs.com/viewthread.php?tid=105334

interesting. reminds me of 翔声's DAC-01解码器 hopefully there is some design different from 翔声 where headphone output does not go through tube, instead goes solid state. only pre-amp out goes through the tube but if this DAC's headphone out goes through the 5670 tube to give you that warm and smooth sound.. then its a steal, i might get one for the fun of it

i was thinking that it would be good for 2A3 filament if i decide to swop to DC instead of using AC but i m not sure if it can tahan the current

i get my tubes straight from source as my gf is schooling TCM in beijing and she helps me get stuff straight from factory.. the Treasure EL34 comes as two grades, normal and superior matched, but even for their normal quad grade, transconductance and plate current is very well matched already, identical plate currents usually. the superior matched grade is typically exported to the US.. i.e. to grant fidelity.. but there are backdoor 国内 sales at very good prices.. prices that i might not want to comment publicly.. i've tested both the 2A3 and 300Bs using two different amplifiers but on the same speakers with several pairs of ears listening, the treasure tube triodes promise superbly dark backgrounds. in our opinions, these triode tubes are one of the best we've ever heard, transparency without losing a touch of air & warmth, very musical indeed. with burn other improvements will come. i cant speak for the pentodes though, but there's talk that either the GE or RCA 6SN7 has warmer vocals than the Treasure tube 6SN7, which is quite a pricey tube in my opinion.. unless you have direct sources in china. ymmv~ for me what i might just do if i have an el34 amp is just to buy the tubes to try, but if dont like, will just let go for a little discount.

finally here!! shuguang treasure tubes.. 300BZ mesh plate and 2A3Z tubes were factory matched and shipped straight from factory... sound straight out of box is so superb that... my pair of TJ mesh plates are getting shelved.. the shuguang treasure series.. is indeed the pinnacle of 300B tubes.. best of the very best i've ever came across... i think the only possible rival is tj carbon plate but the carbon plate is not a fair comparison.. (its like a jumbo 300B.. more like 350B)

hmm but not very ideal for power smoothing i think.. esp if talking about tube filament voltage reg.. the current's high

have three pieces of these.. anyone can think of any use for these double layer caps in any audio application?

LP's really a different sound all together.. check out http://philoctetes.org/Past_Programs/Deep_...Quality_Matters and watch the video, halfway they have a recording of chris whitney, done on tape, but mastered into 2 versions.. a SACD and an LP.. both played one after another.. and you have to listen for yourself.. as to what sound you really like.. i cant remmeber when they do that in the 2hr vid.. probably arnd the 35min mark onwards.. i've been constantly dragged towards the LP side but there's just too many of the stuff i listen to that is hard to find on LP that kinda halts me from doing the migration.. and eventually i'm still stuck on CD format

thanks! was nice meeting you today

sold!

tube amps are actually very easy to build because the principle behind tube amplification is pretty straight forward. the only complicated part is the power supply to me. i still feel for a good headphone amp the best is still to use a single tube, single stage, else there are too many variables right now to change the sound of my 2a3 amp, i can change 1) cathode resistor permutations (2 possible resistors to change per channel resulting in many combinations) 2) coupling caps permutations (2 possible caps to change per channel resulting in many combinations) 3) roll pre-tubes to overcome short comings in power tubes which is highly permutative 4) roll power tubes 5) interstage coupling with a transformer instead (expensive option) 6) other output transformers (although i'm using permalloy which is one of the best winding materials) etc etc.. with a single tube/single stage with a pair of big good bandwidth output trans which will never reach saturation, you have 1) one tube to roll 2) 1 resistor to roll 3) 1 capacitor to roll

current head-fi rig, still sub-optimal sound.. still having fun tweaking signal path's generally some diy-shielded mundorf 1% gold in silver wire, ground's all copper. cathode bypass cap for 2a3 is mundorf silver/gold in oil.. cathode bypass is jenson paper in oil, hermetic vishay angstrohm cathode resistor decent power regulation via choke & mundorf m-cap, amp still gives sound for 20-25 seconds when power switch is flicked off.. filament is still running on AC.. will probably try to regulate it to DC to make amp quieter output in dual tap, 8 ohm to speaker, and 300 ohm to headphone via custom permalloy transformers. continuously running for the past 100+ hours.. hopefully my shuguang treasure tubes will be shipped tomorrow.. have a pair of 6sj7 mesh plates on the way.. ' next project will probably be single ended single stage design

unfortunately there's no ultimate amp.. as technology progresses and better designs surface.. and our increased fickleness with sound overtime

you can get it rewired at several places well audio labs at burlington square lvl 1.. ahfaudio at upper cross street.. zenn audio at bedok.. etc etc etc..

if you're game enough take a look in the little dot 3 and check the signal wire inside, just after the RCA sockets leading to the amplification circuit.. its typically 30-40cm leading to the volume pot and probably another 5-10cm after that leading into the amplification input these cheap wires can be a bottle neck no matter how good your external interconnects are if possible, re-wire with good wire & keep it as short as possible

i'll be doing one for my hd650, so probably when everything falls into place i'll update on the sound signature of it.

if you are interested to make, ahfaudio has this wire in various thickness of 0.5mm, 1mm, 1.5mm.. cant remember the exact prices but 0.5mm is somewhere around $17/metre, 1mm is probably 40+/metre and 1.5mm is 70++ per metre. so if you intend to go double stranded on each side you might need about 6 metres. i would think 1mM is a good diameter.. its not that stiff.. 1.5mm is too thick and stiff

sorry to bump an old post.. decided to start reading threads since i'm still bored at work... but.. BG 16v 47uf so expensive meh?!?!?! i have 3-4 pieces left... dont remember them being that pricey last time.. maybe four or five dollars thats all

if you need wbt or wonder silver solder with silver content, can pop by either well audio or ahf audio, larry hifi etc.. ask to buy a metre.. usually about seven bucks to ten bucks as for the jack, would be nice if you can find a screw version that uses a screw to tighten before you load the solder on to seal it. may be sonically better as you have prior tight contact before introducing a new metal (tin/silver solder) other good solders that people can consider's mundorf's supreme solder, with silver/gold content.. but whether its available in sg or not.. not too sure.. can buy online though.. in 100grams,250grams or 1kg amounts.

which tube monoblocks are you using now? an alternative is for you to just get a pair of proper pair of impedence matched output transformers and swop them in to drive your hd800. i'm currently having my output transformers customized for two taps, one 8 ohm for driver and one 300 ohm for headphones. my amp will be ready in a few days, so probably i m planning to loan the hd800 from sennheiser some day to see if it matches well. if it sounds good i'll share where i got it done from

go LHS at simlim tower.. they have