Last week, we have a local DIY audio gathering at Bintaro (Indonesia). I took some photo, hope these could inspire us (DIY) more in the future. Sorry I didn’t “remember” all the equipments in detail. So most likely, you will enjoy the photos without caption.
The overall look of the stage, used for the testing.
PTT2S tube on action with Mesh Rectifier. On the back, we have some CD Player, like NAD, vintage Marantz CD4000 (fully modified with tube stages, by Paul Yahya), and CEC.
A solid stage based power amplifier, with tube stage on the front.
LME 49720 based pre-amp, powered with Sikorel, Dale Stepped Attenuator, Auricap, and Jensen Paper Tube (I believed I saw some Rikens and some tantalum resistors there).
Multi-tube preamp. Nice looking chassis.
Simple #27 pre-amp, also with Mesh Rectifier on the back side.
Nice chassis, with small tube which I believe it’s 6N1P?
Another #27 pre-amp, with Mesh Rectifier and EL34 on the regulator stage.
LDR based attenuator coupled with B1 Buffer.
A well designed Gainclone, powered by Talema Transformer, Black Gate NX, Nichicon, Elna, and Mundorf. Also some Russian Teflon capacitors and Sfernice Resistor. The chassis and build quality also very nice!
Some other contenders, with different appearance.
Big is beautiful, but small also cute! Well packed Gainclone with some high end stuff like ROE and Solen!
Aikido based pre-amp. I believe it was Octal of 6SN/SL7, with Mesh Rectifier off course.
Hybrid power amplifier. I think it was F4 modified with tube stage.
Old Sony CDP modified with tube stage.
Roy
August 2, 2010 20:02Bro Jimmy, kalo saya liat desain preamp tabung yang dipakai kebanyakan make common power supply buat 2 channel. Kalo dibandingkan dengan monoblok atau dual mono gimana? Apa ada beda kualitas yang signifikan?
Jimmy Auw
August 2, 2010 21:02Hi Bro Roy,
Secara teori tentu lebih bagus, namun mungkin tidak banyak yang bersedia repot2. Apalagi kalo yang pake tube rectifier, tentu akan berat di ongkos.
Thanks.
Roy
August 2, 2010 21:24Temen saya ada bilang tergantung desainnya, kalo desainnya pas, crosstalk di common power supply ga kedengaran. Emang bener gitu?
Kalo make tube rectifier untuk monoblok apa perlu matching tubenya?
Jimmy Auw
August 2, 2010 22:39Hi Bro Roy,
Emang common mode bisa didesain seperti apa lagi? Paling hanya sebatas memisahkan filter LC/RC di stage akhir. Ini untuk topology standard non regulated ya.
Yes, sebaiknya harus match, soalnya beda tube rectifier, beda sisa emisi, beda suaranya.
Thanks.
Roy
August 3, 2010 09:14Ok. Thanks Bro Jimmy.
Jimmy Auw
August 4, 2010 09:13Sama-sama bro Roy.
Thanks.
Anonymous
August 6, 2010 17:43Bro Jimmy, kalo ikutan gath boleh gak? hehehe… tapi kalo di Bintaro jauh juga yah dari rumah ane.
Auw Jimmy
August 6, 2010 22:16Silakan-silakan saja Pak.
Thanks.
arie
August 7, 2010 13:45Thanks for sharing those photos Om Jim 😉
haris
August 7, 2010 15:43pak, ada kesan gak dari LDR attenuator??
kalo mau bikin kira-kira abis berapa ya?
thanks
Auw Jimmy
August 7, 2010 22:36Sama2 Om Arie…
Auw Jimmy
August 7, 2010 22:40Halo Pak Haris,
Pada dasarnya, LDR kurang begitu stabil terhadap impedance input next stage-nya. Jadi di contoh yang dibuat oleh salah satu rekan di acara kemaren adalah menambahkan buffer output B1 di keluaran LDR agar lebih stabil dan “kompatibel” ke berbagai jenis next-stage yang akan menerima sinyal attenuasi dari LDR ini.
Kalo mau bikin, sebenarnya tidak mahal. Yang sulit adalah mencari optocoupler yang match agar balance kiri/kanan channel lebih terjaga. Saya pernah liat di website ada yang tawarkan kit sekitar US$ 100, belum termasuk output stage tambahan (seperti B1 yang dipake rekan DIY kita di acara kemaren).
Kesan saya sih karakternya agak “plain”. Mungkin juga karena kepengaruh banyak ama karakter B1-nya sih.
Thanks.
aphinx
August 25, 2010 08:40Setuju, Pak Jim. Suara yang dihasilkan LDR Attenuator memang polos sekali, makanya sempat ditawarkan untuk jadi attenuator BT Power Amp. Sayang sekali, saya datang agak terlambat, sehingga sudah keburu dibuatkan attenuator dari ALPS Biru.
Auw Jimmy
August 25, 2010 15:28iya Pak Aphinx… sayang juga.
Thanks.