[Magic77]

HeadRoom Little (Newest Version)

Manufacturer: HeadRoom Corp., www.headphone.com

Power Supply: Regulated Wall Wart(grounded) hard wired directly into amp with 6ft. cord. Power Supply made by; Elpac Power Systems.

One set of RCA inputs, One headphone jack output:1/4 inch.

Audio Image Processor switch and High Pass Filter switch on front panel.

2 green LED power indicator lights on front panel.

No ON/Off switch.

Upgrades: Can be upgraded with the Little More Power Supply, which must be done at HeadRoom Corp.

There are no specifications available for this amp; but it uses Burr-Brown OPA-604 Op-Amps. Check out www.burrbrown.com for the OPA-604 specs.

HeadRoom does not specify the type of Potentiometer used on the new Little, but I beleive it is a Clarostat Pot.

Price: $259

 

[shivohum]

SUGDEN HEADMASTER

Picture of amp (both a full-size image and a 70x70 pixel image)

download below (only the full-size is included)

Amp manufacturer: J.E. Sugden and Co.
Amp name/model: Sugden Headmaster
In production? (yes/no) yes
List price (final list price if no longer in production): $900
Current "street" price (used only if no longer in production): $850
Type of amp (solid state/tube/hybrid): solid state
Stock tubes (only if tubed)
Crossfeed? (yes/no, how many levels) no
Other processors? (yes/no, type, details) no
Portable? (yes/no) no
Power supply (batteries/AC) AC
Detachable power cord? (only if AC, yes/no) ??
Number of headphone jacks: 1 switched headphone socket
Jack impedance (per jack, if more than one) ??
Jack output (per jack, if more than one -- include @ #Ohms) ??
Jack type (mini, 1/4", per jack if more than one) 1/4"
Inputs (line, etc., how many) 3
Other outputs (line, pre-amp, speaker, etc., how many): Attenuated Pre Amp out Tape-out
Speaker output rating (only if speaker out -- include @ #Ohms)
Possible upgrades/upgrade path (tubes, power supply, electronics, etc.) Power cable, if it's detachable
Housing material (plastic, steel, aluminum, etc.) aluminum
Size (dimensions) 230mm x 265mm x 82mm
Weight 3.5 kg

Other Available Info:
Inputs: Three stereo pairs.
Input Impedance: 50K
Input sensitivity: 150mv in for 1volt output
Output Impedance: 4Ohms to 56kOhms
Power output: 5.5volts at onset of clipping
Bandwidth: -3dB points 10Hz & 270kHz
Frequency response: +-0.3dB 20Hz-25kHz
Signal to noise: > 90dB

 

[jbannow]

Amp manufacturer - Audio Technica Japan
Amp name/model - ATH-HA2002
In production? (yes/no) - Yes
List price (final list price if no longer in production) - Yen140,000 (~USD$1080)
Current "street" price (used only if no longer in production) - NA
Type of amp (solid state/tube/hybrid) - solid state (Class A)
Stock tubes (only if tubed) - NA
Crossfeed? (yes/no, how many levels) - No
Other processors? (yes/no, type, details) - No
Portable? (yes/no) - No
Power supply (batteries/AC) - AC (100V 50/60Hz)
Detachable power cord? (only if AC, yes/no) - Yes
Number of headphone jacks - 2 ( Both can be used simultaneously)
Jack impedance (per jack, if more than one) - 16 Ohms - 600 Ohms (???)
Jack output (per jack, if more than one -- include @ #Ohms) - 2400mW @ 16 Ohms; 65mW @ 600 Ohms
Jack type (mini, 1/4", per jack if more than one) - 1/4", 1/4"
Inputs (line, etc., how many) - 2 pair RCA inputs, 1 DC Direct, 1 AC Coupled (Both cannot be used simultaneously)
Other outputs (line, pre-amp, speaker, etc., how many) - None
Speaker output rating (only if speaker out -- include @ #Ohms) - None
Possible upgrades/upgrade path (tubes, power supply, electronics, etc.) - None
Housing material (plastic, steel, aluminum, etc.) - Cherry faceplate (Echizen lacquered) w/ metal body (???)
Size (dimensions) - H93 × W270 × D240mm
Weight - 5.0kg

These headphones are specifically designed to work with the ATH-W2002 headphones (though they should work with any headphones I would think). The website is http://www.audio-technica.co.jp/prod...at-ha2002.html. You can translate this with http://babelfish.altavista.com/.

 

[Hirsch]

Amp manufacturer: Moretto, likely a distributor for Radii Audio in China
Amp name/model: HAP-03
In production? yes
List price: sold on ebay, reserve set at $349
Type of amp: OTL tube
Stock tubes: 1 x 12AU7, 2 x 6DJ8, according to Radii audio. Tubes with the amp from Moretto were washed clean.
Crossfeed? no
Other processors? yes, an external processor is available from Radii Audio (HAP-04) which will allow use of lower impedance headphones.
Portable? no
Power supply: AC, power supply is separate from amp and attached by included umbilical cord.
Detachable power cord? yes
Number of headphone jacks: one
Jack impedance: 150 Ohms (cannot drive lower impedance headphone)
Jack output:
Jack type (mini, 1/4", per jack if more than one)
Inputs" one line imput
Other outputs: none
Possible upgrades/upgrade path: HAP-04 processor
Housing material: steel
Size: small
Weight: light

 

[shorton]

Single ended Class A1 - 3 watt stereo amp:
3 watts per channel integrated stereo amplifier with front panel volume control and 3 input selector switch. Single-ended class A1 no feedback DC coupled design.
Output Tubes Not Included.

Price: $1995
In production: yes

CHASSIS: Zinc plated 18 gauge cold rolled steel.
Top and bottom are 18 gauge cold rolled steel,
brass plaque logo on top plate.
The chassis is satin Iron Glimmer powder coat.
Black wrinkle powder coat on top and bottom.
Machined aluminum feet with rubber inserts.
Glass port holes are Pyrex glass with machined
aluminum rings.
OUTPUT TRANSFORMERS: Manufactured by
Electra-Print Audio Company
User selectable: 2,4,8 & 16 Ohms.
TUBES: Output optional.
One 5AR4 Rectifier Tube "Sino"
Pair 6SL7 "Sovtek"
LINE CORD: 16 gauge, 3 conductor IEC cord.
VOLUME CONTROL: Alps potentiometer.
SELECTOR SWITCH: Three input with coin silver contacts.
POWER OUTPUT: 3 watts, 5% THD @ 1kHz.
TOTAL HARMONIC DISTORTION: Less than 1%
40 - 20 kHz @ 1 watt.
POWER SUPPLY: Is a low-flux leakage design using
R.C.L.C.R.C. design.
FREQUENCY RESPONSE: (-3dB points at 1 watt)
5Hz - 32 kHz.
INPUT SENSITIVITY: 500 mV for 1 watt out
INPUT IMPEDANCE: 100 K ohms.
OUTPUT: 2,4,8 & 16 ohms. User select.
CARDAS: Speaker jacks.
Hand wired point to point for all signal circuits.
OVERALL NEGATIVE FEEDBACK: None
HUM & NOISE: .15 mV full bandwidth.
TEST MEASUREMENTS: Made with KR2A3
output tubes.
POWER REQUIREMENTS: 110 - 125 VAC 60Hz
(210 - 250 VAC 50Hz) 75 Watts
DIMENSIONS: 4" H x 14 1/4" W x 15 ½" L
WEIGHT: 40 Lbs.
HEADPHONE RECOMMENDATIONS: Sennheiser
HD600,
RECOMMENDED SPEAKER SENSITIVITY : 96 dB
or better.
WARRANTY: All components carry a 3 year parts and
labor warranty. Tubes carry the manufacturers'
warranties. Shipping and handling is not included.

 

[Hirsch]

Amp manufacturer: Joseph Grado Signature Products
Amp name/model: HPA-1
In production? (yes/no) no
List price (final list price if no longer in production): $795
Current "street" price (used only if no longer in production): ???
Type of amp (solid state/tube/hybrid): solid state
Stock tubes (only if tubed)
Crossfeed? (yes/no, how many levels) no
Other processors? (yes/no, type, details) no
Portable? (yes/no) yes, but awkwardly
Power supply (batteries/AC) both
Detachable power cord? (only if AC, yes/no) in a way: power cord is part of HP P/S-1 power supply, and is Grado Ultra-High Bandwidth Reference cable
Number of headphone jacks: 1
Jack impedance (per jack, if more than one) ??
Jack output (per jack, if more than one -- include @ #Ohms) ??
Jack type (mini, 1/4", per jack if more than one) 1/4" (1/8" adapter included)
Inputs (line, etc., how many) 1
Other outputs (line, pre-amp, speaker, etc., how many): 0
Possible upgrades/upgrade path (tubes, power supply, electronics, etc.) HP P/S-1 regulated power supply
Housing material (plastic, steel, aluminum, etc.) steel
Size (dimensions): approx 6 x 3 x 8 in.
Weight: 5 lb

 

[JMT]

Amp manufacturer: Antique Sound Labs
Amp name/model: SR Head
In production? (yes/no) Yes
List price (final list price if no longer in production): $199
Current "street" price (used only if no longer in production): ???
Type of amp (solid state/tube/hybrid): Solid State
Stock tubes (only if tubed)
Crossfeed? (yes/no, how many levels) No
Other processors? (yes/no, type, details) DSP Surround
Portable? (yes/no) No
Power supply (batteries/AC) AC
Detachable power cord? (only if AC, yes/no) No, seperate power supply unit.
Number of headphone jacks: 1
Jack impedance (per jack, if more than one) ??
Jack output (per jack, if more than one -- include @ #Ohms) ??
Jack type (mini, 1/4", per jack if more than one) 1/4"
Inputs (line, etc., how many) 1
Other outputs (line, pre-amp, speaker, etc., how many): 0
Possible upgrades/upgrade path (tubes, power supply, electronics, etc.)
Housing material (plastic, steel, aluminum, etc.) Steel
Size (dimensions): approx 5"W x 4"D x 1.5"H (amp only)
Weight: Approx. 2 lbs. (amp only)

 

[eric343]

META42:
Manufacturer: JMT, Tangent, Me, Anyone else with a soldering iron
In production: Yes
List price (final list price if no longer in production): $170-$400
Current "street" price (used only if no longer in production): n/a
Type of amp (solid state/tube/hybrid): Solid State
Stock tubes (only if tubed)
Crossfeed? (yes/no, how many levels) Default No
Other processors? (yes/no, type, details) No
Portable? (yes/no) Depends
Power supply (batteries/AC) Both
Detachable power cord? (only if AC, yes/no) yes, seperate power supply unit.
Number of headphone jacks: 1-2
Jack impedance (per jack, if more than one) Varies
Jack output (per jack, if more than one -- include @ #Ohms) ??
Jack type (mini, 1/4", per jack if more than one) Whatever you want
Inputs (line, etc., how many) Default 1
Other outputs (line, pre-amp, speaker, etc., how many): 0
Possible upgrades/upgrade path (tubes, power supply, electronics, etc.) Lots
Housing material (plastic, steel, aluminum, etc.) Varies
Size (dimensions): Anywhere from pocket-size to desktop to rackmount
Weight: Anywhere from palm-pilotish to boat anchor

 

[Dave-O]

SHURE SA-1:
Manufacturer: Shure Brothers, Inc.
In Production? No (late 60's-early 70's)
List Price? Unknown
Current Street Price (If out of Production)? >$100
Type of Amp(solid state/tube/hybrid)-Solid State
Stock Tubes (If tubed)
Crossfeed? No
Other processors? No
Portable? No
Power Supply? AC (internal PS)
Detachable Power Cord? No
Number of Headphone Jacks-2 (1/4")
Jack Impedance (per jack)4-200 ohms (for optimum results, use earphones of 4-16 ohm impedance)
Input Impedance: Phono-47 kilohms, tuner- 250 kilohms
Jack type: Phono- RCA, Tuner -RCA
Channel Separation: 40dB min from 50-20,000Hz
THD: >1% driving both channels simultaneously to 8-ohm load @ 100mV level
Other outputs-no
Possible Upgrades/Upgrade Path-no
Housing Material: Steel (with satin walnut simulated wood vinyl coating)
Size (dimensions) 3 9/16"(H)X10 1/4"(W)X3"(D)
Weight: 1-1.5 lb

Edit 2/17/03: Pics added by Hirsch

 

[Dave-O]

pic

 

[zzz]

Picture of amp:

(inside)

Amp manufacturer: Esoteric Audio Research/Yoshino LTD
Amp name/model: HP4
In production: yes
List price: about 2100 euro + tax in Europe, something ridiculous (3595+ USD) in North America
Type of amp: tube
Stock tubes: Sovtek 6SL7GT
Crossfeed: no
Other processors: no
Portable: no
Power supply: AC
Detachable power cord: yes
Number of headphone jacks: 4
Input impedance: 40K
Jack impedance: 2 ohms
Jack output: up to 1W
Jack type: 1/4"
Inputs: balanced and unbalanced with a selector switch
Other outputs: balanced and unbalanced line outs
Possible upgrades/upgrade path: (DIY only) pot, tubes (not recommended by Tim)
Housing material: steel
Size: WxDxH : 245mm x 320mm x 95mm
Weight: 6kg

 

[robo7]

Manufacturer: World Audio Design (HiFi world)

Amp name/model : HD83
In production? yes
List price : 175 UKP (kit)
Type of amp : Tube
Stock tubes : ECL83
Power supply (AC)
Number of headphone jacks : 1
Jack impedance : 16-50 50-125 125-250 & 300 ohm - (pre selected)
output : 1 Watt
Jack type (1/4")
Inputs : line
Housing material : Steel
Size 7"(W) x 3.5"(H) x 12"(D)

 

[robo7]

Manufacturer: GSP Audio

Model : Solo
In production? yes
List price : 400 UKP / 795 US$
Type of amp : solid state (AD IC's)
Power supply : external 12VA (included)
Number of headphone jacks : 1
Jack impedance : 20-600 ohm
Jack type : 1/4"
Inputs : 2 line (30k)
Housing material : aluminum
Size : 44mm (H)

 

[Lloyd Peppard]

Amp manufacturer: Mapletree Audio Design www.mapletreeaudio.com
Amp name/models: Ear+ Purist/Ear+ Purist HD/Ear++
List prices (May/04): Ear+ Purist kit $335. Assembled $395. Ear+ Purist HD kit $540. Assembled $620. Ear++ kit $395. Assembled $475.
Type of amp: tube
Stock tubes: 2x12B4A+5751 (Ear+) 2x12B4A+5751+12BH7A (Ear++)
Crossfeed? no
Power supply: AC
Detachable power cord? Yes
Number of headphone jacks: 1 (1/4")
Jack output impedance: 7 Ohms (headphones)/500 Ohms (line output for Ear++)
Inputs: 1 line (Ear++ has 3 line inputs)
Other outputs: Ear++ has 1 line output
ossible upgrades: Pemium capacitor options, power supply options. Ear+ Purist HD50 is a limitied production (4 units) of the Purist HD with two line inputs, dual headphone output jacks, switchable headphone impedance, and magic eye tube monitor tubes.
Housing material: aluminum/steel
Size: 8" x 12" x 4" overall
Weight: 8 lb

 

[Lloyd Peppard]

This passive switch box is intended to permit simple switching of one of 4 source signals to either a headphone amplifier or to the main system amplification path. It can also be used to increase the number or switchable source inputs to an independent headphone amplifier.

Switches are plastic encapsulated with phosphor-bronze contacts. All wiring is silver-plated stranded copper with Teflon insulation. I/O jacks are RCA gold-plated. The chassis is 9" x 5" x 2" and matches the other Mapletree Audio products.

Price: $120 assembled. Custom I/O labeling is offered at $10 additional.