We have just received a few pieces of SV-300BE (new version) from SUNAUDIO JAPAN. All the transformers have been upgraded to new version having square top corners. These transformers are taller in height with larger logo plates on top giving a more attractive appearance. I suspect that there is not much difference in the output transformer SOT-525A comparing to the old one though it has increased in height, but the power transformer and choke are replaced with the PC-1035E and A-825A which have bigger capacity than the old one ( PT-150B and CH-515). In fact these power transformers runs much cooler than the former (become quite hot in long time operation). 
price is now $23800HK. Sorry for the increase in price but the increase in the cost of material and upgrade in transformer makes it impossible to keep the old price. Only two units are available for the time being. Next shipment may take up to 3-4 months or even longer.
We have recently go a few pairs of TAKASUKI 300B tubes from Sunaudio. Only one pair is left now. Get it before it is gone. Price is $12800hk. （ALL SOLD）
We accept purchase outside Hong Kong. You can pay through PAYPAL but shipping is extra.
SUNAUDIO SV-2A3 and SV-300BE on sale
最近從日本進口一批SUNAUDIO特價貨品，相信這是最後一次能夠取得那麼低的價格。部份貨品由本店用日本TANGO或其他高質素火牛改裝及升級零件組成，欲購從速，恕不預留。
Got some special priced units from Sunaudio Japan recently. May be the last good deal at such low price. Some units upgraded withTango transformers and better components. Get it now before it is too late. No reserve due to quick sale.
Sunaudio SV-300BTE mono amps. Extensively modified with WE310A as the driver tube and parallel feed mode used on the output stage. HP power transformer, Luxman output transformer and Tamura choke. All combined to give amazing sound quality and nice looking appearance. Price is $19800/pair
以上是SV-300BTE 單聲道後級。這處改用西電310A作為推動管，輸出級用並聯輸出接法工作，輸出牛是LUXMAN火牛而桅流圈是TANGO制做的，這個配搭營造出十分滿意的音色，外觀亦十分悅目。價錢是$19800壹對。
Sunaudio SV-2A3 modified to use either 2A3 and 45 tube. A bigger size TANGO power transformer is fitted here so that unit runs much cooler during prolong operation. Price is $14800HK
以上是SV-2A3改裝可以用上45或2 A 3管子的設計，這部機用上了體積更大的TANGO電源牛，所以長時間工作火牛亦不會很熱＇價錢是$14800元。
Sunaudio SV-2A3 modified so that either 2A3 or 45 tube can be directly plug in and work. The output section works on the parallel feed mode. The plate choke and output transformer are made by TANGO JAPAN. Price is $14800HK
以上是SV-2A3改裝成可以用45或2A3燈膽的設計，輸出部份用了並聯火牛線路＇兩隻火牛都是TANGO制造的＇價錢是$16800元
Sunaudio SV-300BE that use a pair of smaller Japan made output transformer. The overall sound quality is similar to the original Tamura transformer with less bass (smaller size does matters). Price is only $10800HK
以上這部SV-300BE用了體積較小的日本制作的輸出牛＇音色舆原庄TAMURA牛是接近的但低頻較少而已，價錢是超值的$10800HK
Sunaudio SV-300BE modified to get three inputs with selector in front. Now you can adjust the output volume on both with just one touch (more convenient and precise). Price is $14800HK
以上這部SV-300BE改裝變成了有三個輸入插座由前面一個選擇掣來控制，現在你可以很簡單及方便的去調𣐀音量了，價錢是$14800元
A specially made preamp using UTC input and Tamura output transformers with the addition of headphone jacks. Balanced input and output are available here for the sack of four transformers. Price is $14800HK
以上是特別制作的前級＇用UTC輸入牛加TAMURA輸出牛，並附有耳機接頭，拜這些火牛所賜有平衡及普通的輸入及輸出插座＇價錢是$14800元。
Sunaudio SV-300BE using the parallel feed mode at the output stage. Luxman output transformer is used here. Price is $14800HK
Sunaudio Sv-300B MKII mono amps gained good reputation in the US long time ago. It is a pity that they discontinued its manufacture. This particular pair is being newly reproduced using the same and original circuit and parts. Price is $29800/pair
以上這一對SV-300B MKII後級是海外揚威的型號，很可惜已經停產，這對是應用了原來線路及零件制作的制品，價錢是$29800壹對。
Oversea buyers are welcome. But please be noted that the amplifiers works on 230-240V AC only. Free packing but SHIPPING and other charges are hot included in the price. Youcan pay through PAYPAL. $1US = $7.8HK. Please contact me at : refaudiohk@gmail.com
BLACK GATE and ELNA capacitors made in JAPAN
BLACKGATE and ELNA capacitors deserved special attention due to their high quality which many audiophiles love. There is almost an immediate and noticeable improvement in sound quality once they are being used to replace inferior quality caps, and the effect will be more pronounce when they have burnt in.
The price of these caps has becoming quite expensive in comparison – a black gate heart of muse 2x100mfd new in packing fetches $10000hk a piece in the market, and I witnessed four brand new caps lying on my table. They are purchased by my friend for his projects on several pieces of headphone amps that are going to be produced here in my workshop.
Do it justify for the price? You may ask. Please consider these caps are the best money can buy and they are no longer produced. They will last for a very long long time, if being used properly, and you can enjoy amazing music anytime you want, with no complain, only satisfaction and relaxation. You pay what you can possibly get, and it seems to be a great deal.
Only the following items are remained for sale. Most of my stock was used on various projects over the years. Get them before they are gone forever. We can sipped to oversea buyers. You can pay through PAYPAL. $1US = $7.8HK. Buy with confidence. Many amps sold oversea and none has problem. Please contact me at : refaudiohk@gmail.com
BLACKGATE CAPS
Caps having 500V working voltage were all consumed. Only the following items remain:
220mfd/200V NOS. $2000/pair
22mfd/350V used. $1500/pair
100mfd/160V。 NOS. $2500/pair
10000mfd/63V used. $4000/pair
ELNA CAPS
It is quite fortunate that high voltage caps at 500V are still available. You can connect two caps in series for your 211 or 845 amps that usually work close but below 1000V. Or you may connect three caps (350V) in series to get a little bit more safe margin. Two series connected caps (350V) will be used for plate voltage above 500V (some push pull amps require 550-600V working voltage). The combination is simple and neat. You must put equalisation resistor (about 200kohm 2W) across each cap when they are connected in series to ensure proper distribution of supplied voltage. The following caps are in stock:
100mfd/500V NOS $2000/pc
100mfdx2/500V
220mfd/500V NOS $3500/pc
220mfd/350V NOS $2500/pc
22000mfd/56V. One new, one used $2500/pair
10000mfd/100V. NOS. $6000/4pcs
TOP QUALITY PARTS – CAPACITOR and RESISTOR
Recently I got a big lot of good quality parts from my good friend. A portion of it will be retained for my future projects but most of them need to be sold. It will be a good chance to get such nice parts at reasonable price. Don’t miss it.
These parts can be delivered to customers outside Hong Kong. It will be safely packed and shipped by airmail. Payment by PAYPAL is accepted. $1US = $7.8HK. Buy with confidence. Many amps sold oversea without complain and none has problem. You can contact me at : refaudiohk@gmail.com. Nice hunt and order.
MCAPS are considered to be one of the best quality capacitors that are still in production. Made in Germany with remarkable sound quality. They have presented a series of caps that are specially design for the use on tube amplifiers. Here are those in stock:
100mfd/550V. NOS. $1500/pc
200mfd/550V. NOS. $2000/pc
High quality resistor used on 2A3 (750ohm) and 300B(1Kohm) single end amplifier Used on SUNAUDIO amps. $300/pair
100mfd/35V non-polar caps used as cathode bypass capacitor. Very nice quality and great sound. NOS. $500/pair
SUNAUDIO 845 amplifier – new version – less heat, better sound
No upgrade in parts but still sounds wonderful. Price is $14800HK
Totally ungraded with Jensen capacitors. Really sounds great and nice looking. Price is $18000HK
Last piece of modified unit lighting up. No upgrade in parts. Amazing sound quality and good looking. Price is $15800HK
Two modules (switching power supply mounted on the bottom cover plate. Easy access for doing upgrade.
Bottom plate put on and secured. Just enough space thanks for the small size of modules.They stay warm only after several hours of operation.
I always wonder why Sunaudio did not produce any kind of 845 or 211 single end amplifier in their series. At closer study it was found that the same power transformer (PT-150) is used on all their amps (except the top model SV-300BSM). There is no 10V windings ( filament of 845 tube needs 10V) on the transformer, and two 10V AC 5A windings are required because the big tubes need DC on their filament in order to get reasonable low hum at the speaker output terminal.
很久以前已經有這個疑問，為什麼SUNAUDIO沒有生產使用大型燈膽如211或845等的管子作為輸出功率管呢？細心的觀察一下不難發覺差不多在所有型上使用的電源牛（PT-150)是沒有10V燈𢇁用的繞組，而若果用這類大管時必須有2組10V5A的燈𢇁繞組用以提供2組10V直流給燈𢇁用才成，否則喇叭會聽到相當大的交流聲。
I have tried to fit (barely sufficient space) and use Tango or Hatsimoto power transformers on a few units but they becomes alarmingly hot during prolong usage (not more than 4 hours). Though I learn for a long time that switching power supply is used on some big power tubes (212 and 833A) filament supply, I have no idea how these items can be fitted on Sunaudio amps.
我亦嘗試過用TANGO或橋本火牛（體積可以勉強放下）放在一些實驗機上使用．但長時間使用時熱量大高（四小時後）。雖然很久以前已經知道有些設計是使用開關式電源組件作大管子如212或833A等燈𢇁供電，但我並不知道這些是否可以用在SUNAUDIO的機種上。
Recently I have bought two 12V 50W switching power supply and commence my experiment. It proved to be a success and it is also possible to squeeze two of such unit inside the casing.
I am very pleased with the finished product. The sound quality is better and the hum is even lower than the previous version, and the power transformer runs warm only after a few hours operation.
最近買了2個12V50W的開關式電源組件做實驗，實驗是成功的，2件組件都可以擠入機箱內。對於件成品我十分滿意，跟以前的制成品相比，它音色更好噪音更低，並且火牛在數小時工作後只是暖手而已。
Three units are modified. There are difference on the use of parts and therefore not are the same price. Hope you like and enjoy their performance.
改做了三件成品，因為三件機內零件畧有不同，所以售價不一樣。希望你們會喜歡它們的表現。
Oversea buyers are welcome. But please be noted that the amplifiers works on 230-240V AC only. Free packing but SHIPPING and other charges are hot included in the price. YOU can pay through PAYPAL. $1US=$7.8HK. Please contact me at : refaudiohk@gmail.com
The BEST and BIGGEST headphone amplifier on the PLANET?
I have just completed a project on one of the BEST and possibly the BIGGEST headphone amplifier on the Planet. It is huge (600mm wide x 300mm depth) and weight around 70 lbs.
It was tailor made for a young guy who has the rare passion on the sound of vacuum tubes. I had built a couple of headphone amplifier for him using different types of direct heat triode tubes, and this is the final and ultimate construction of the series.
Tamura ISO transformers are employed for the construction to ensure un-surpass sound quality. We follow the golden rule – SIMPLE IS THE BEST. Top grade iron plus best quality parts, simple and straight forward circuit design.
Here we use Western Electric 275A as the output tube. Compare to WE 300B, it is not well known, but considered by some audiophiles to be better or at least as good as the big brother. The useful output power of this tube is merely 4 watt, but it is already more than we need. The miniature western electric 417A is the driver tube. It will be coupled to the 275A through a interstage transformer. The design is extremely simple and effective as there is no capacitor in the signal path, and therefore no colouration or delay of any sort. The input is connected direct to the CD player or any signal source, and the level controlled by a high quality volume pot.
I am not going into detail of the construction and choice of parts etc. You may have other design and preference on parts. Hope you enjoy.
TANGO and TAMURA TRANSFORMERS
Got from my good friend some brand new and use transformers made by Tango and Tamura transformers. They are on sale at special price. Don’t miss the chance!
TANGO X-8P old version not ISO new in box $20000/pair
TANGO ISO LCPF-100-150D 100H 150mA Plate Choke for 212, 833A, 845 etc (matching with output transformer below)
TANGO ISO FCPF-100-5S 100W 5K output transformer parallel feed (match with the above choke) total 4 pieces $28000
TANGO ISO FC-40-3.5 for 300B, PX-5 etc. new in box. $13800/pair
TANGO ISO NC-20F II interstage (the best you can find) new in box. Sold
TANGO ISO LC-10-20 choke. 10H 200mA new in box Sold
TANGO ISO FX-40-5 new in box $5000/pair
TANGO FX-40-10 new in box $5000/ pair
TANGO #11792 2K 120W for parallel push pull 4×6550 etc new in box $15000/pair
TANGO XE-65-1 , #11250 , #11251 one complete set of used irons for 6C33C push pull stereo power amplifier in very good condition. $10000/set
TANGO EQ-600P (LRC-TYPE) best for DIY phono amplifier used but in very good condition $7500/pair
TANGO MS-UVD 220V for 845, 211 stereo amp excellent condition $7500/pc
TANGO #10697 specially ordered new in box primary: 0-220V Secondary : 500-450-0-450-500V 0.26A, 0-6V 6A, 0-6V 6A, 0-6.3V 3A, 0-6.3V 3A, 0-5V 4A for any suitable tubes $6500
TANGO MS-400H NOS with box primary : 220V secondary: 0-115V-125V 1.4A, 320V 100mA, 70V 100mA, 6.3V 7A, 6.3V 7A, 6.3V 3A for 6C33C $5000/pc 2 in stock
Oversea buyers are welcome. $1US= $7.8HK You can pay through PAYPAL. Please contact me at: refaudiohk@gmail.com