Friday, May 27, 2016

Audiophile AD1865 DAC

Ultimate - Final Version - AD1865 Dual Mono DAC - U$139 / module


AD1865 x2 paralleled with high grade IV/LPF with discrete circuit




  • 44.1/48kHz coaxial digital receiver
  • Uses twin AD1865 paralleled for double current output
  • Discrete components IV and LPF buffered output
  • Version 7
  • Input supply: dual 18Vac + single 10Vac input, 30VA and above (voltage must be correct)
Note: We can do a fully built DAC if you wish. Email us for various available options.

Million Digital Media Player

Million Digital Media Player U$199





  • WAV media player - supports WAV and WAV CUE playback
  • Language: Chinese (PRC and Taiwan), English, Japanese
  • Uses crystal oscillator precision clock - 11.2896MHZ OCXO as clock
  • Format: 44.1KHZ (optimized), 48KHz, 88.4KHZ, 96KHZ
  • Input power supply: 8-12Vdc / 1A or more
  • Supports maximum 64G SD Card
  • 2.4" OLED display with remote control
  • Output: coaxial SPDIF and I2S digital output
  • Chassis: 102mm x 112mm x 90mm

TDA1541 DAC

Audiophile TDA1541 DAC  - U$240 for a completed module

Digital section uses dedicated I2S isolation scheme, using software controlled WM8804, SAA7220P/B with TDA1541A chip. This scheme has sweeter mids, better low frequency and clearer high frequency resolution compared to other TDA1541A DACs.

*** Genuine TDA1541Ais supplied with the board. ***







Power supply inputs: single 6-9Vac, and dual 12-15Vac
Size: 146mm x 118mm

What user needs to do is to connect the AC power and the connectors and it will work!

Note: We can do a fully built DAC if you wish. Email us for various available options. 

Audiophile Digital Media Player

Audiophile Digital Media Player

1.3" OLED version - U$169
0.96" OLED version - U$149








Features
  • Supports 44.1 - 96kHz .WAV files
  • RCA coaxial SPDIF and Philips I2S output
  • SD card as storage 
  • External DC supply of 9-12Vdc is required (12Vdc 160mA)
  • Aluminum chassis, 8mm face plate
  • Size: 110mm W x 110mm D x 50mm H
  • Designed with high quality clocking and power supply and is only dedicated to .WAV playback only for the best optimum playback results. Dare to AB it with any similar players in the market.
Important note: Warranty void if dismantled

PGA2311 Volume Control Module

PGA2311 Volume Control Module (fully built and tested)


PGA2311UA - SMT, stereo version - U$89
PGA 2311UA - SMT balanced version - U$129
PGA 2311PA - through hole version - add U$10






Features
  • PGA2311 version 10 with Panasonic relays
  • BB PGA2311 - brand new volume control chip, with internal resistive attenuator network, where under 0dB, the internal OPAMP is not activated, and where over 0dB, the OPAMP starts to work.
  • Board settings: -95dB to +31dB, 1dB step
  • AC 8V-12Vac input
  • Fully regulated with On-Semicon 3-pin regulators. Digital section is powered by MC7805 separately for lowest interference. 
  • Digital and analog supplies are decoupled by Philips 104 decoupling capacitors for better noise isolation/separation
  • Separate IC for digital and relays control.
  • STC15 series of controller is used, with off-power memory storage
  • Uses original Panasonic TQ2 relays, lowering the signal loss
  • Remote power off module is available for purchase
  • Controller board and display board can be connected physically or via cable
  • Paired with high quality ALU remote control
Note:
* Limited availability of PGA2311-A version with half the THD.
* Compatible chassis is available - ask us for more details  

Operating instructions:
  • Rotate left/right - volume control
  • Short press  - channel switch
  • Long press (3s) - power ON/OFF
  • Long press (10s) - reset to default values
  • Short press (during off) - power ON
  • Remote - V+/0: volume, CH+/-: channel switch, Power: on/off, DSP: display current input, Mute: mute.
  • 0dB = direct through
  • Input: CH1, CH2, CH3, CH4
  • Mute: ---
  • Off: .
  • Power on display: PGAVOL
Note: We can do a fully built preamp if you wish. Email us for various available options. 

HIFI Volume Control

HIFI Remote Controlled Volume Board - Version 15 - separate displays


  • 50K 128 steps relay volume attenuator - U$119
  • PGA 2311 version - U$109
  • 50K 128 steps balanced version - U$159
  • PGA 2311 balanced version - U$149



Note: completed tested modules

For the volume control section, please refer to version 8 (relays) and version 10 (PGA2311) for more details.

128 Steps Stepped Attenuator

128 Steps Stepped Attenuator 


Stereo version - U$99
Balanced stereo version - U$129 
  • Constant input impedance 128 steps stepped attenuator (2014 version 8 special edition)
  • Logarithmic smooth volume steps 
  • Bundled with full aluminum remote control
  • Fully assembled and tested module
  • Relays - Panasonic Japan, brand new, including all components
  • Volume / channel settings - memorized even if power is disconnected  
  • Relays are digitally micro-controller controlled




Instructions/functions

  • On/off, volume up/down, mute, channel switching, and etc
  • Long pole digital switch / decoder - rotate left/right for volume, short press for channel switching, long press for power on/off (needs a separately power on/off module)
  • Logic control board can be separated with the display board, attenuator board can be separated with the channel switching board, both being connected by interconnect wires (flexible)
  • AC 12V supply, 4 relays for 4 channel switching, 7 relays for 128 steps volume control, with 0.5dB steps, totalling to 63.5dB attenuation
  • Display board (with the logic control) - 100mm x 32mm.
  • Attenuator board - 100mm x 36mm
  • Signal switching board - 55mm x 36mm

Q&A

Q: Does it have noise or AC hum?
A: It has been optimized several times. No noise or AC hum.

Q: Is the attenuation smooth?
A: Yes, with LOG scale and 0.5dB steps, absolutely smooth transitions

Q: Does it have pops?
A: Due to the mechanical configuration, there is 1 step with a very short and minor pop, which is absolutely acceptable. 

Q: Is the relay good?
A: Yes. It is imported from Japan high quality TQ2 relays.

Q: Is the remote control good?
A: Yes. The touch and feel are excellent.


Note: We can do a fully built preamp if you wish. Email us for various available options. 

Relay Volume Attenuator

High End Relay Stepped Volume Attenuator / Volume Control

  • Stereo Version: U$74
  • 4-Channel Version: U$94
  • Balanced Version: U$104

Music signal does not go through brush pots, going through only purest resistive parts and sealed relays.


Features

  • 256 steps volume attenuator
  • High grade double sided PCB
  • Extra thick gold plating
  • PCB 2mm, copper trace thickness 75U, unlike general 50U traces
  • Milspec 718 resistors 
  • Small PCB size, space saving
  • Direct replacement of carbon brush pots or mechanical switch step attenuators
  • Size: 86mm x 55mm
  • Sealed silver contacts Takamisawa relays 
  • Input voltage: double 12Vac - 18Vac (2/4 channel), 15Vac (balanced)

Notes

  • If it is to be used with tube amplifiers, please notify us for high impedance version, custom made

4 channel 256 steps attenuator

256 steps Relay Stepped Attenuator

4 channel relay stepped attenuator

Stereo Relay Stepped Attenuator

Balanced Relay Stepped Attenuator
Note: We can do a fully built preamp if you wish. Email us for various available options. 

Thursday, May 26, 2016

6L6 Single Ended Tube Amplifier



6P3P / 6L6 Single Ended Tube Amplifier U$349





 



Amplifier details:




This amplifier has ZERO feedback and therefore the sound is open, relax and mellow. 6L6 has been used widely in vintage amplifiers. It is not the linear-est tube but definitely one of the good sounding ones.



The output transformer was specially designed to have very high primary inductance (20H @ 100Hz) and therefore the low frequency response is excellent. This amplifier is more flexible due to the decent output power and can be matched to quite a number of loudspeakers. The dynamics is as good as a class A 1969 or TDA7294 and even the LM1875 solid state amplifiers.



The input/output sockets are high quality gold plated pure copper version, unlike those very thin chemically plated version which will wear off in a very short duration. The volume knob is 36mm, with a 6A 250V high quality durable ship type on-off switch.

This is a true full tube amplifier and therefore it has output transformers. The quality of the output transformers is most important to the sound quality and we spare no changes on that. The output transformer is one of the reasons for the tube sound – proper matching of impedance.

What you will be purchasing:

150W power transformers – cool and quiet running. High quality output transformers made of Z11 made in Japan SiFe EI core. The power transformers and output transformers are arranged in such that the interference are minimized. With Z11, the output transformer has higher primary inductance and therefore the low frequency response will be excellent. Z11 is much better than the H14 or H18 SiFe cores. These transformers make most of the cost of this 6P3P / 6L6 single ended tube amplifier.

The internal pictures are shown clearer to show you the quality of the parts and the care we took to make this amplifier.

This 6P3P / 6L6 tube amplifier is purely hand made. The chassis is made of solid Ash wood, being properly dried and painted + polished multiple times. The wood grain is rich and the design is simple yet elegant. The top plate is 2mm ALU, bottom plate is 1mm ALU.

This tube amplifier employs CLC filter with a huge 5H 200mA choke to further lessen the power supply ripple and provides a better and cleaner / darker background.

*** This is an economical hand-made solid wood chassis. There shall be imperfections, such as wood fillings or wood grain cosmetic imperfections. Purist and perfectionist – please do not buy! ***

Size: 25cm W x 30cm D x 19cm H.

Weight: 8KG.

Output power: 6W x2 (tube amplifier overloads gently – even harmonics, and therefore it sounded more powerful that it should be).

Note:


I. When ordering, please specify if 4 Ohm or 8 Ohm output tap is needed. Default is 8 Ohm.

II. This amplifier runs full class A, with low distortion, sweet and mellow sound, and is suitable to drive high efficiency speakers, or bookshelf speakers. Full range single driver will be ideal and perfect match for this tube amplifier.

III. It is a MUST to connect to a load (speakers) when the amplifier is switched on to prevent damage to the tube and amplifier.

IV. The wood grain will be different with every unit of amplifier produced.

V. Reinforced packaging are applied for this amplifier. Tubes are in a separate box/compartment and users will install tubes themselves.

Additional features: 




 


We have changed the tube rectifier from 5Z4P to 5Z3P, to provide more current to the amplifier circuit, better for dynamics, headroom and bass response. User will not hear any hum at the listening position. There is just very slight hum can be heard if ears are sticking next to the driver.

Components: J grade Beijing 6N1-J and Shuguang 6P3P-J tube. Shuguang 5Z3P tube rectifier. PSU capacitors – Nippon Chemicon or Nichicon electrolytics, with high power metalized oxide resistors and 5H 200mA choke with form a CLC power supply filter to suppress the rectification ripple/noise.

Coupling: Rifa film capacitors, paralleled with oil capacitors for warm and refined sound. Bypass capacitors are with high quality made in Taiwan electrolytics. Volume control is with Taiwan Alpha B100K stereo attenuator.

Output transformers: 3.5K: 0-4-8 Ohm, made with high grade Z11 SiFe steel with special winding method for better sound.
All products carry 1 year free after sales services. Tubes has 3 months warranty only. If you leave good comments at our pages to help with our sales via words of mouth: for 100 words, you get 6 months tubes warranty; for 150 words, you get 2 year free services.

Use the form on the right to order.