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I ordered from a Taobao seller ,but I'm not sure whether they have any ebay business or reseller Thanks ! Was trying to use mounting PCB but I forgot to restock (faceplam).Will going to tie them to look more tidy

Finished a build for my friend,still crappy at wiring job..... This one's gain is set at 16X under balanced mode,powered with 2xsimga 22 PSU,will post more photos after tuning knob arrived Sound amazing like any other KG design ,EPIC ! my own onboard heatsink /w KG Goldrefrence PSUs version also coming update with feet installed

YES,it's 120mA,you should have 1.2V reading across 10R but 100mA-110mA sounds best IMO

EPIC！

why don't try combo XLR Jacks ? they can do both 3pin XLR and Single-ended TRS,but sure 5 pin XLR with converting cable is a good choice also

Slowly getting some progress and other parts coming p.s still got 3 sets of CAST/ubal to bal board left

I put them on lab bench psu before,can't remember what's exact number of current draw,but I'm sure under 1.5A then built a slimmer case version a while ago using orginal GR and works pretty well

CFA Boards are coming,will report back after my build is completed ! BTW,how much current per channel is balanced CFA needed?

THIS http://gilmore.chem.northwestern.edu/ubaltobald.pdf Original Post at here:

The J1 placed in the middle of uber3 ubal to bal. Thanks ! now I can comfortably share +/- 24V supply with CFA2

Finally decided switching to Uber3+CFA2 set. got some question for uber3 what is the use for J1 Jumper and can we apply +-24V directly to uber3? thanks

OK Thanks ,I will consider it but how much should the bias be?I read 150mV across 1Ohm somewhere,is that right ?

HI All,apolgize for my english first I'm planning to build a CFA3, but when reading gerber layout , http://i.imgur.com/T2QaX1X.jpg I see silkscreen prints " GAIN=10K SS,1.5K ZF Input=5K SS,100 ZF " and also noticed SS,ZF marked on silkscreen.I assumed ZF is for Zero Feedback and SS for Super Symmetry but not so sure whay they actually mean.so asking what are they mean and how to adjust them if needed to. Another question is about bias.it seems to be measured by 1Ohm and adjusted by 5K pot,but how much bias is appropriate? Thanks

I used OPA445BMs on my build ,I think single OPAmps can run unity-gain stable should work fine

I think japanese made R-core would be better Kitamura Kiden (北村機電) http://kitamura-kiden.co.jp/

My Build, LCD Display and Control board is designed by Hong Kong DIYer "Kevinyip". But I didn't use onboard reciver,RS232 and display only Source inputs are connected from backplane which I bought from TAOBAO

also goes bottom panel mount here

1N4007 is for protection as shown below, 1N4002 would be better if you only have 4001 and 4002 LED between + - rails can be power indicator and simple load to help discharging caps.

Thanks! besides not as "hi gain" as I thought , actually they work well .Love that sound with switch on btw,I am curious about how does this feedback design work in the circuit , any paper or keywords that I can learn from ?

finally finished the build with some sp style wiring

same question here,is there any reason to use tantalum caps at certain places like C8、C13 instead of electrolytic or ceramic caps ?

congrats,would like to see the finished build !

RCA Should be isolated from metal case

Thanks !

what value of input pot should be used on squarewave klone? read 10K somewhere before but I can't find it or maybe should use higer value like 50K/100K since it's fet input? thanks