hello, first time to say hello here.
my name is kim dong hyun in Pusan South korea.
i use hagerman trumpet phonostage from hagerman's products
here is my system introduction.
i recently saw video file in the YOUTUBE.
someone here posted his system, username is amandare? maybe incorrect. sorry for my poor memory.
through computer speaker, the sound is quite good. his system is quite different from me. but i got interested in this kind of OB style spekaer.
so i bought used fostex fx200 unit here and made OB speaker from drawings of Je labs.
i used plywood 18t.
sound is fantastic.
bass is quite astonishing and most important thing is that sound is alive from note to note.
it is very vivid sound and imaging is 3d like.
just seems as if the players are in my room.
i drove it with 6n1p srpp el34 triode connected single ended poweramp. it is built by me using sacthailand transformers
preamp is silvaweld swp500 which is full function preamp. made in korea. but i modified it .
phonostages are
quick silver phonostage, hagerman trumpet , and silvaweld swp500.
turntables are scheu premier mk2, and loth x othello.
cartridges are audio technica mono LP, denon 103, and last goldring eroica lx.
step up tranformers are sowter 8055 ( for audio technica mono ) which goes to trumpet.
and jks mc transformer ( made in korea ) for denon 103 which goes to quick silver phonostage.
and last goldring eroica goes to mc phono input of silvaweld swp500.
tonearms are scheu classic 12 inch longarm which is heavily modified by me,( for denon 103)
umpingo wood unipivot tonearm 12 inch for audio technica mono LP
and last loth x carbon fiber unipivot tonearm for goldring eroica lx.
cdp is cheap inkel (korean brand ) cdp and dac is 47lab shiragaki copied nonos dac which is made by me.
sound is quite smooth and dynamic.
but most of all, it sounds like real music.
thanks for good speaker building idea
i attached the photos ( another speaker is lynn olson ariel mk2 )
so far, i have used lots of phonostages and step up transformers
for example, hagerman trumpet and diyed cornet and bugle, kandk phonostage ( old version ), aesthetix rhea, supratek syrah, loesch phonostage, steve bench riaa5, Fi audio Yph, klyne sk6, motif 7, electrocompaniet 3, quick silver phonostage, gary pimm phonostage ( diyed by me ) je labs phono ( i made it with 12ax7 though ), ear 834p thorstenized, CAT SL-1, accuphase c-100, etc... i cannot remember .
but i sold much of them, and keep trumpet, quick silver ( i replaced all the signal cap and riaa cap, and powersupply electrolytic with film cap and that improved it very much. i think quick silver much higher level than ear 834p any variation ), gary pimm diy phono, steve bench riaa 5 phono. and silvaweld swp500.
and still working on tubecad aikido phonostage and linestage.
i have owned many step up transformers
tribute, s&b 103, sowter 8055, lundahl 9206, sacthailand , diyhifisupply amorphous mc step up, old sansui trans, AEE transformer, electraprint audio(1:20),
i sold almost all of them,and keep sowter and jks and electraprint and old sansui.
they sound just different, not better nor worse.
i always follow Jim hagerman's cartridge loading.
i found that his recommendation on primary loading is many good effect on high frequency taming of mc cartridge.
i donot use secondary loading , it degrades too much .... sound just becomes lifeless.
just use primary loading about 300- 500 ohm across primary of transformer. that is all that needed for good sound .
i would like to thank Jim for quite correct quidance about transformer loading and his circuit .
i learnt quite a lot from his circuit.
i donot just copy his circuit. but i learnt many things about powersupply design and phonostage design.
and thank amandare for quite good speaker posting in youtube.
it is the best speaker ever i have owned. ( merlin vsm-se with ac bam is only one of many examples, this fostex ob has fuller and controlled bass than merlin and image is much better )
i took photo of my system. but how can i post it ?
best
kim
