[size=x-small](AMB prototype shown, actual appearances vary depending on case used)[/size]
DIY design developed by
AMB.
Inquire about having one prebuilt by
MisterX or
thrice.
Assembled and tested circuit board modules are also available from
SFT.
-Amp name/model: β22 ("beta 22")
-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, all-discrete fully complementary, JFET input stage, BJT voltage amplification stage, high current MOSFET output stage. All stages dynamically cascoded. 2-channel passive ground, 3-channel active ground or 4-channel fully balanced options.
-Stock tubes: n/a
-Crossfeed: None
-Other processors: None
-Portable? No
-Power supply: Companion
σ22 ("sigma 22") all-discrete, complementary dual rail tracking regulated PSU, ±24V to ±30VDC.
-Detachable power cord? Yes
-Number of headphone jacks: 1 or more
-Jack output impedance (per jack, if more than one): < 0.01Ω
-Jack output (per jack, if more than one -- include @ #Ohms) n/a
-Jack type: 1/4" phone (unbalanced) or dual XLR (balanced)
-Inputs: Line in (unbalanced RCA or balanced XLR)
-Other outputs: Speaker output (optional)
-Output power (unbalanced): 18Wrms/ch into 8Ω, 5.6Wrms/ch into 32Ω, 0.75Wrms/ch into 300Ω
-Output power (balanced): >50Wrms/ch into 8Ω
-Possible upgrades/upgrade path: See websites
-Input Sensitivity: n/a
-Maximum Gain: 8 (20.8db) default, can be built to other gain settings
-Input Impedance: 47.6KΩ (depends on volume pot/attenuator used)
-Output Impedance: < 0.01Ω 20Hz - 20KHz
-Total Harmonic Distortion: 0.0010% (RMAA)
-Intermodulation Distortion: 0.0072% (RMAA)
-Frequency Response: 0Hz - 2.5MHz, +0, -3dB
-Slew rate: 198V/µS @ 43Vp-p output, 100KHz square wave
-Rise time: 175nS 10%-90%, 100KHz square wave
-Signal to Noise Ratio: 90dBA (RMAA)
-Stereo Crosstalk: -86dB (RMAA)
-Housing material: Various choices
-Size (dimensions): Various choices
-Weight: n/a
