Head-Fi Amp Guide -- Submissions

[KtoEto]

Rudistor RP4.1
Rudistor, Trieste, Italy
RP4.1
In production
List price 550 Euros
Type of amp hybrid
Stock tubes double triode 12AU7
Crossfeed No
Other processors No
Portable No
Power supply AC
Detachable power cord Yes
Number of headphone jacks 1
Jack output impedance 32-600 Ohm
Jack output 450 mW max
Jack type 1/4"
Inputs line in 2 RCA
Housing material aluminum
Size (dimensions) 242W*80H*282L mm
Weight 5.5 Kg

[mikeymad]

Specifications
MG Head DT / OTL MK III Headphone Amp

Tubes (included)
2 x SOVTEK EL84/6BQ5
1 x electro-harmonix 12AX7EH

Output power:
240mW (33 Ohm)
110mW (120 Ohm)
70mW (300 Ohm)
Frequency response: 25 Hz - 40 KHz +- 1dB
Distortion: 0.60% at full power
S/N Ratio: 83dB (0.15mV)
Input impedance: 100K
Output impedance: 13 Ohm
Input sensitivity: 1V
Power consumption: 21 W
Dimensions: amp 7.1" wide, 7.5" deep, 6.3" high; power supply 7.1" wide, 3.8" deep, 3.5" high
Net weight: 10 lbs.
Current List: $395.00

[digicom_t1]

See Manufacturer's Site for More Pix: http://www.wooaudio.com/products/wooaudio3.html


Amp manufacturer: WooAudio
Amp name/model: WooAudio 3
In production? Yes
List price: $460
Type of amp: Single Ended Class A Tube Headphone & Pre Amplifier

Stock tubes: 1 x 6080/6AS7, 2 x 6922/6DJ6 All gold pin tube sockets.
Crossfeed? No
Other processors? No
Portable? No

Power Supply: AC 110 V, 50/60 Hz (220 V available. Specify when order)
100 watts specially made toroidal transformer.
Detachable power cord? Yes (not provided)

Number of headphone jacks: One
Headphone Impedance: 30-600 Ohms
Jack type: 1/4"
Input impedance: 100 Kilo-Ohms
Frequency response: 8 Hz - 100 KHz +/-3dB
Pre-amp Gain: 10 dB
Signal/Noise: 90 dB
THD: <= 0.08%
Power output: 2 Watts per channel
Inputs: One, Gold-plate RCA
Other outputs: One (Pre Amp) Gold-plate RCA

Possible upgrades: Tube rolling within the family of tubes listed above.
Ling to HeadFi DYI Mods: http://www4.head-fi.org/forums/showthread.php?t=96731

Construction Material: Heavy duty full aluminum die-cast chassis with 1/4" Face Plate, black anodized or satin brushed silver - other colors (red, blue and champagne may be available soon), large aluminum volume knob & push button power switch.

Other notes on Electrical:
All Point to point hand wired.
Alps potentiometer and power switch
ELNA and WIMA capacitors
High precision resistors
Teflon wires

Size: 5-5/8 "(L), 13 "(W), 6"(D)
Weight: approx. 9 lbs.

User Notes: This amp pairs very well with Senn 650s and Sony SA5Ks!

[robo7]

In production? yes
price : 778 $
Type of amp : Solid State
Portable? no
Power supply : Internal
Number of headphone jacks : 2
Jack type : 1/4"
output : 200mW/300ohm 400mw/60ohm
Distortion: 0.001% 6mw/300ohm
Inputs : 1 / 47K
Gain : 0db, 10db, 20db
Consumption: 5W
Size : WxHxD 110 x 44 x 280mm
Weight : 1.5 Kg

[MartinP]

Originally Posted by kuma

Amp manufacturer : Naim Audio
Amp name/model : Headline 2
In production? : YES
List price: 550$/Headline2
450$/NAPSC power supply 1,000$/FlatCap2 power supply 1,750$/HiCap2 power supply
Type of amp: Solid State
Power output ( into 8 Ohms ): 560mW/channel
Crossfeed? : NO
Portable?: NO
Power supply : Yes. AC type. Must be used with external power supply. Optional Flat-Cap 2 or Hi-Cap maybe used in place of NAPSC
Detachable power cord? : YES
Number of headphone jacks : 1
Jack output impedance: 8 Ohms to 2 KOhms but prefer to drive high impedance headphones per company's published specs.
Jack type: 1/4"
Inputs: 1

Possible upgrades/upgrade path:
• FlatCap2 or HiCap power supply or for real crazies Super-Cap2
• install a chassis mounted DIN connector instead of a provided captive lead for a possible cable rolling
Housing material: Aluminum chassis
Size: 57 x 121 x 187 mm


• Naim Headline2 vs. Gilmore V2 with Grado RS1

It's worth pointing out than Naim now have a cheaper PSU for the headline, the "iSupply".

US price is $165, nearly $300 cheaper than the previous cheapest option, the PSC2.

BTW, with a different adapter, the iSupply can power an iPod for improved performance. Only one item at a time, though.

cheers, Martin

[Gaffer74]

In production? no
final list price? £250 (GBP)
Current "street" price? About £60-£100 dependant on shop
Type of amp? Hybrid Triode Valve amp
Stock tubes? Philips JAN 6922 tubes
Crossfeed? no?
Portable? no
Power supply? external 12V AC 500mA
Detachable power cord? yes
Number of headphone jacks? 1
Jack output? 100mW into 40 Ohm (>100mW for loads >40 Ohm)
Jack type? 1/4"
Inputs? 1 line
Other outputs? 1 line
Speaker output rating? 100mW into 40 Ohm (>100mW for loads >40 Ohm)
Possible upgrades/upgrade path? not officially but could replace stock tubes with others for a different sound
Housing material? aluminium
Size? 110 x 110 x 220 (W x H x D) width and height include feet (mm)
Weight? ~3.5kg

PS Here it is with modifications inc. holes in upper casing to improve airflow ventilation over the hot tubes inside:

[kuma]

Originally Posted by MartinP

It's worth pointing out than Naim now have a cheaper PSU for the headline, the "iSupply".

US price is $165, nearly $300 cheaper than the previous cheapest option, the PSC2.

BTW, with a different adapter, the iSupply can power an iPod for improved performance. Only one item at a time, though.

Thanks Martin!

The listing now is updated.

[dusty_v]

Amp manufacturer: Channel Islands Audio (CIAudio)
Amp name/model: VHP•1
In production: yes
List price: $349
Type of amp: solid state
Crossfeed: no
Other processors: high/low gain switch
Portable: no
Power supply: AC adapter
Detachable power cord? yes
Number of headphone jacks: 1
Jack output impedance: 30~700 ohms
Jack output: 2 watts @ 32 ohms
Inputs: 1
Other outputs: 1 loop through
Upgrades: VAC•1 High Current Power Supply ($159)
Housing material: extruded aluminum with machined aluminum panels, knobs
Size: 4.40"w x 2.65"h x 4.40"d
Weight: 4 lbs

[amb]

(AMB prototype shown, actual appearances vary depending on case used)

DIY design developed by AMB and Morsel
Also available prebuilt from MisterX, thrice and SFT.

-Amp name/model: M³ (pronounced "M cubed", sometimes written as "MMM", "M3" or "M^3")
-In production? Yes
-List price: DIY: varies; Prebuilt: contact builders for pricing info
-Current "street" price: n/a
-Type of amp: Solid state class A, 3-channel topology with active ground, High current MOSFET outputs, AD8610, OPA627 or other opamp voltage gain stage.
-Stock tubes: n/a
-Crossfeed: None, can be optionally added
-Other processors: Bass boost, continuously variable or switched (optional)
-Portable? No
-Power supply: 24VDC - 40VDC external, regulated
-Detachable power cord? Yes
-Number of headphone jacks: 1 or more
-Jack output impedance (per jack, if more than one): < 0.05 ohm
-Jack output (per jack, if more than one -- include @ #Ohms) n/a
-Jack type: 1/4" phone or others
-Inputs: Line in (two unbalanced RCA)
-Other outputs: Speaker output (optional)
-Speaker output rating: 6Wrms/ch into 8 ohms (with 36VDC 3A PSU)
-Possible upgrades/upgrade path: See websites
-Input Sensitivity: n/a
-Maximum Gain: 11 (20.8db) default, can be built to other gain settings
-Input Impedance: 47.6K ohms
-Output Impedance: < 0.05 ohm
-Total Harmonic Distortion: 0.0009% (RMAA)
-Intermodulation Distortion: 0.0051% (RMAA)
-Frequency Response: 0Hz - 1.5MHz, +0, -3dB
-Signal to Noise Ratio: 97dBA (RMAA)
-Stereo Crosstalk: -95dB (RMAA)
-Housing material: Various choices
-Size (dimensions): Various choices
-Weight: n/a

[Stridbeck]

The Ear-90 Headphone Amplifier

Amp manufacturer: Harmony Design
Amp name/model: Ear 90
In production: Yes
List price: Unbalanced $500, balanced $600
Type of amp: Solid state
Crossfeed: No
Portable: No
Power supply: AC 230/115V
Detachable power cord: Yes
Number of headphone jacks: 2
Jack type: 1/4"
Inputs: One balanced or one unbalanced
Possible upgrade: Elma level control
Housing material: Steel + stainless steel + aluminium.
Size: H 50, W 25 , D 21.
Weight: 2.2 kg