LD A1 tube amp DAC by Little Dot

• Very rare design of tube amp + dac all in one machine
• Excellent soundstage
• Tubes: RCA 6HS7 JJ 2A3 5U4C
• Current All in one flagship

Description

Good sound comes from good electronic components
The pre-stage tube uses the RCA metal encapsulation tube 6SH7 in the 1940s, the customized Lundahl headphone amplifier transformer, the original custom-made Noratel power transformer. The coupling capacitor uses the Mundorf MCap Supreme Silver Oil capacitor, the audio grade Kiwame resistor is used, and finally all the signal switches and the volume control encoder are all made of ALPS products.

(Some tube amplifiers and other specialised equipment may need to be made to order. If unsure about availability please contact us)

ES9038pro decoder chip
ESS company decoder chip ES9038PRO, ultra low distortion, high signal to noise ratio, large output current. The system clock uses an ultra-low phase jitter US Sitime active quartz crystal with a phase jitter of less than 0.5px. Regardless of the format of the LD A1, the sampling frequency is high, which ensures smooth and phase-locked decoding.

2A3 ultra low distortion amp
LD A1 with American RCA antique tube 6SH7 + Svallock JJ 2A3 single-ended pure class A ultra-low distortion headphone amplifier, the output power reaches 5W rms, the overall sound stage, positioning, airness are unforgettable.

The LD A1’s full-range soundstage is excellent and its bass response is also excellent, listening to any music will give you a refreshing and transparent feeling.

Supported formats: 
44.1/88.4/96/176.4/192/352.8/384/768KHz 16/32-bit
DSD64, DSD128, DSD256, DSD512 (2.8224-22.5792 MHz)
Frequency response:
Decoding frequency response: 20Hz-20KHz+/-0.2dB
Amp frequency response: 5Hz-80KHz+/–1dB
Decoding dynamic range: DNR 132dB
Output Power:
32 ohm 3W
120 ohm 2W
300 0.6W
Power consumption of this machine: 95VA
Volume: 350*290*230 (including tube height) mm
Weight: 16kg

Common question:
1) What headphones is it suitable for?
LD-A1 is suitable for all kinds of high and low impedance HIFI dynamic ring headphones and flat earphones with a price above 1500 yuan. It is not suitable for electrostatic headphones.
2) What style of music is it suitable for?
The LD A1 is suitable for a variety of musical styles such as classical, jazz, rock, pop, folk and more.
3) Front-end music equipment: CDs, digital broadcasts, computers, and mobile phones with digital output can all be used as sound sources.
4) The own enthusiast can replace the op amp of the decoder part, the coupling capacitance of the amp part, etc., but it is not recommended for the novice DIY.

Note: We also have the cheaper version of this all in one machine, instead of Lundahl output transformer, we use the z11 core from Japan and custom build the transformer in China. On top of that, we added bluetooth feature in the cheaper version so it’s more versatile. If anyone is interested in this product, please email us and let us know.