scelta pre-amp

chiederei un consiglio al volo......quale fra i 3 pre-amp?


WA3 Headphone and Pre Amplifier[/b]:
Technical Specifications:
Headphones impedance : 30-600 Ohms
Input impedance: 100 Kilo-Ohms
Frequency response: 8 Hz - 100 KHz -3dB
Signal/Noise: 95 dB
THD: <= 0.08%
Pre-amp Gain: 10 dB
Voltage: AC 110/220V, 50/60 Hz
External dimension: 6"(H), 5½"(W), 13"(D)
Weight: 10 lbs
Standard Features:
Point-to-Point wiring
One 6AS7 / 6080 [PDF] power tube
Two 6922 / 6DJ8 [PDF] drive tubes
One RCA input
One pre-amplifier output
1/4" (6.3mm) stereo headphone jack
Full aluminum die-cast chassis, anodized finish
Whole aluminum volume knob and power switch button
80 watts specially made toroidal transformer
Gold-pin tube sockets
Gold-plate RCA
Alps potentiometer and power switch
Silver-plated hook-up wires in Telfon jacket



Little Dot MK II MK 2 Tube Headphone Amplifier / Pre-amplifier[/b]

Technical Specifications:
SEPP (Singled-ended Push Pull) OTL in Class-A
Input: Gold-Plated Unbalanced Phono (RCA) Jacks
Output: 1/4" Gold-Plated Stereo Headphone out
Driver Tubes: 6JI
Power Tubes: 6N6
Frequency Response: 20HZ - 50KHz (-1dB)
THD+N: 0.1% (50mW into 300 ohms)
Suitable Headphone Impedance: 32 - 600 ohms
Input Impedance: 50K ohms
Pre-Amplifier Output Impedance: 600 ohms
Pre-Amplifier Gain: 3-10x (also controlled via gain switches)
Pre-Amplifier Voltage: 10V RMS
Pre-Amplification circuit includes both driver and power tubes
Power Output:
300mW into 300 ohms
200mW into 120 ohms
100mW into 32 ohms
Power Consumption: 28W (228V x 0.124A)
Metric: 210mm (length) by 110mm (width) by 130mm (height)
English: 8.26 inches (length) by 4.33 inches (width) by 4.18 inches (height)
Weight: 2.5 kg or 5.5 lbs.
1 Year Little Dot Warranty




Little Dot MK III 3 Headphone Tube Amplifier/Pre-Amp
SEPP (Singled-ended Push Pull) OTL in Class-A
Frequency response: 12 hz~100 Khz (-1dB)
THD+N: 0.15% (80 mW @300 ohm)
Power Output:
350 mW @ 300/600 ohm
300 mW @ 120 ohm
100 mW @ 32 ohm
Power Consumption: 30W (228V x 0.130A)
Variable Gain: 3,4,5, or 10x
Recommended Load Impedance:&nbsp;&nbsp; 32 ohm~600 ohm
Input Impedance: 50K ohms
Pre-Amplifier Output Impedance: 600 ohm
Pre-Amplifier Gain: 3-10x (also controlled via gain switches)
Pre-Amplifier Voltage: 10V RMS
Pre-Amplification circuit includes both driver and power tubes
Driver Tubes: 2x 5654 (included)
Power Tubes: 2x Soviet 6H6n (6H6PI) (included)
High quality aluminum chassis
Dimensions (Metric): 270mm deep by 175mm wide by 123mm high
Dimensions (English): 10.6 inches deep by 6.9 inches wide by 4.8 inches
Weight: 3 Kg or 6.6 lbs
110-120V or 220-240V depending on your country
1 Year Little Dot Warranty


il primo costa di più non capisco se la differenza vale qualcosa in termini di qualità;

fra il 2 e il 3 ho scritto al produttore che ha fatto un copia e incolla ma mi ha risposto:

"The Little Dot MK II and MK III are based on the same design, but the Little Dot MK III has a bit better components and comes with better tubes. It's really up to you but we generally recommend the MK III as the best price/performance value. I hope this helps a bit and if you have any other questions, please let me know!
Best Regards,
David
- davidzhezhe"



Here we are! thanks!