CELLO EQUIPMENTS RESTORATION AND REPAIR

We have recently acquired quite a lot of Cello equipments for restoration and repair. These jobs have become quite a common practice since Cello equipments appeared since 1980s and most of them are nearly thirty years old. The capacitors are the most vulnerable component that are going into trouble. Most of them start to fail due to leakage of electrolyte fluid or getting dry, losing the capacitance or simply short circuit.
We believe that these equipments can be restored to the original performance level with the renewal  of all the electrolyte capacitors and other components which may find to be defective. Most of them will be replaced with caps having the same capacitance and same makers as well in order to ensure a successful restoration. Caps of other makers have their own characteristics which may affect the sound quality of your precious equipments. It may still work alright but it is just not all right. Something is missing that anyone can sense the difference.
Cost of our work depends on the parts that need to be renewed and we cannot give you a precise amount unless the equipments are examined and tested. We are confident that you will be satisfy with our work since it will be done with utmost care and good workmanship as well, and the parts are mostly original (we have large stock on parts which are specially ordered two decades ago).

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CRAZY YEAR END SALE – SUNAUDIO AMPS

In order to move the last remaining stock on SUNAUDIO amps they are being sold at extremely affordable price. Do not miss the chance or it will be too late.

為了酬謝諸位SUNAUDIO的存貨將以最優惠的價錢出售,萬勿錯過勿失良機。

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Update version of SV-300BE with square corners transformers. The bigger size power transformer ensures long time steady operation and cool running temperature. Price is slightly increased to 22800hk on brand new unit. 最新款的SV-300BE放大器,現在火牛是方角的並且電源牛體積加大了,這樣更可以保證穩定及減低火牛升溫。全新的機價只畧為提升至$22800元。

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Demo unit using F-913 output transformers. It has better performance than the original SOT-525 with additional 4 ohms output tapping. Excellent condition. Last piece in stock. Price is only $16800. 這件是示範品,狀態近全新,輸出牛是F-913比原庄SOT-525特性高一級及有4歐姆輸出抽頭,最後壹件,只售$16800hk.

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SV-300BE using Tango output transformers. Upgraded with Jensen capacitors. Very nice condition. Only sell for $14800hk. 這件SV-300BE 用上了TANGO 輸出牛及用Jensen電容作補品,狀態十分好'只售$14800元。

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Integrated amplifier using 300B and having three inputs. Output transformer is SOT-850 with 8 ohms output. Very affordable price and good performance. Very good condition. Only $12800. 用300B 作為輸出管的合併機,有三組輸入,狀態十分新淨,抵玩夾好聲,只售$12800hk.

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Rarely seen second hand SV-2A3 amplifier in good condition. The output transformers have been repainted but the performance is unaffected. One of the best selling units. Now only $11800hk. 十分罕見二手的SV-2A3 放大器,輸出牛是重新油漆但音效是依舊一樣的美妙,最𣈱銷的產品,現在只售$11800元

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A special SV-2A3 amplifier using TANGO output transformers. Here the sound nature of output tubes will be fully realised. The buyer has another choice now. Price is $12800hk.用TANGO輸出牛的SV-2A3,音色比較中性而分折力更強,更加能夠特出表現輸出膽的音色,買家有多了一個選擇。價錢只是$12800元而已。

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One of the most affordable amplifier with power and control. The SV-6L6SX is loved by many buyers  due to its low price and good performance. This 2nd hand unit is only $9800hk. 十分超值的放大器,有力水及控制力,討人喜歡的價格舆優質表現,這台二手機只售$9800元。

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The long time best selling amplifier employing the circuit of WE-91A amplifier. In these units, Tango U-808 output transformers are used. The power transformer was made by HP USA. The beautiful sound of 310A pentode-made by various makers- is being fully realised due to the combination of 300B as the output tube. Small size but great performance. Only $13800/pair. 這是一款長期十分𣈱銷使用西電91 A後級線路的放大器,輸出牛是TANGO而電源牛是美國H P制造的。在這裹310 A及300 B的配搭令五極管的優美音色及質感等發揮得淋漓盡致。只售$13800壹對。

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Another nice pair of amplifier using WE91A circuit. The output transformers is TANGO FW-20S and the power transformer are also HP USA. Better components and a bigger chassis are used on these units to give superior performance. Price is a little bit higher. $16800/pair. 另外壹對使用西電91 A線路的優質放大器。輸出牛是TANGO FW-20S 而電源牛是美國H P制做的,使用更高級的零件及較寬大的機盤令音色表現更上一個層檔次,價錢畧高,但亦只是$16800元而已。

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Amplifier using 845 as the output power tube. The output transformers are the model SOT-850 while the new model PC-1040E power transformer is used here. Working at around 500V the output power is increased to 12W. The use of switching power supply module for the 845 filament enable the amplifier to operate for prolonged time while the power transformer remains warm only.使用845作為輸出管的放大器,輸出牛是SOT-850而電源牛是新款的PC-1040E , 工作電壓是500 V左右令到輸出功率增大至12 W左右,由於使用開關式電源作燃點845的燈𢇁,所以即使長時間工作電源牛仍然只是微暖而已。特別的產品,別樹一格的音色,只售$14800元。

 

SUNAUDIO SV-300BE new version

剛從日本運來幾件新款的SV-300BE,所有火牛外殼都改變為方角,高度增加近壹寸而銘牌亦變大了,整體來說覺得外觀更加好看更有吸引力。我懷疑輸出牛除外型上有所改變外其他分別應該不大,但電源牛及握流圈明顯變容量比以前的有所增加,預期長時間工作這些火牛不會像舊型號那些那麽燙手,對於準買家來說是一個喜訊。
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 CH-515A which have bigger capacity than the old one ( PT-150B and CH-515). In fact these power transformers runs much cooler than the former (the old version become quite hot in time running. It is a good news for the buyers.

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十分抱歉,價格現在提升至$23800元。廠家解釋因為材料價格升高及火牛容量增大以致成本急劇成比例變高,再無法維持以往的售價了。目下只有兩件存貨,下壹批次有可能在數月後,或者更久也不一定。
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.

SUNAUDIO 845 amplifier – new version – less heat, better sound

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No upgrade in parts but still sounds wonderful. SOLD

 

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Totally ungraded with Jensen capacitors. Really sounds great and nice looking. SOLD

 

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Last piece of modified unit lighting up. No upgrade in parts. Amazing sound quality and good looking. SOLD

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Two modules (switching power supply mounted on the bottom cover plate. Easy access for doing upgrade.

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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.

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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!

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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

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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

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TANGO  EQ-600P (LRC-TYPE)  best for DIY phono amplifier  used but in very good condition  $7500/pair

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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