Amplifier No.2320

300B Monoblock Amplifier No.2320 is a fully balanced directly heated triode designed in collaboration with Don Sachs and Lynn Olson (under license). 

Ordering

• Made-to-order 
• 90 Day construction lead time 
• $30,000 USD per pair 
• Pairs with Preamplifier No.2310
• Optional front face material (Hardwood or powder coated aluminum)
  • Various wood species available (Walnut, birch, cherry)
  • Various powder coat metallic colors available (Charcoal, Black, Silver, Forest Green etc.) 
  • Custom decal colors 
    • Black metallic with yellow or white letters 
    • Brushed aluminum with black letters 

Sound Characteristics 

• Lifelike presentation of instruments and vocals (Sound signature of the NOS 2P29L Russian Radio Tubes)
• Extremely low noise floor (achieved with fully balanced true differential architecture)
• Expressive dynamics especially in the vocal region (all stages are discretely powered and directly heated) 

Features 

• Zero feedback design 
• Class A
• Transformer coupled (no capacitors in the signal path)
• Directly heated regulated filament supply 
• Proprietary output transformers
• Naked foil resistors (click here)
  

Specifications

• 22wpc (1kHz sine tone before clipping) 
• Frequency Response: 18Hz - 30kHz +/- 0.5dB
• XLR: 1 Input 
• RCA: 1 input 

Physical 

• 460mm wide x 285mm tall x 373mm deep 
• (18.11" x 11.22" x 14.68")
• 25Kg (55 lbs) 

 Further Details

* The 2320 uses the most linear components in the most linear circuit, combined with state of the art power supplies.

* How do we do it? Every amplification stage operates in fully balanced Class A, the lowest inherent distortion circuit, combined with the lowest distortion tubes ever made. Not by accident, this is the same circuit Western Electric used in the 1920's for their Long Lines telephone service.

* Specialized transformers re-balance the audio signal at every stage, which prevents unbalanced distortion terms from building up. Stage-to-stage balance is created by passive, stable means, instead of active phase inverters.

* The audio signal travels in a straight path of direct-heated vacuum tubes, point-to-point wire, and custom transformers. Nothing else. There is no feedback, local or global. What you hear is the sound of the vacuum tubes themselves, unencumbered by secondary circuits.

* The transformers are state of the art, ultra wideband Monolith output and high-level transformers, with Cinemag input and low-level interstage transformers.

* The audio chassis is a solid copper Faraday cage, forming a quiet ground plane for the point-to-point wiring of the audio circuit.

* An amplifier this transparent requires uncoloured, ultra-low-noise power supplies that do not interact with each other. There are separate, isolated supplies for input+driver, and output sections. Output clipping, or brief Class A2 or AB2 operation, has no effect on the input or driver stages.

* Durability is important too. The power supplies gently ramp up voltages, avoiding turn-on shock and start-up transients. The servo bias for the driver and output tubes maintains precise DC balance for the life of the tube, and prevents tube runaway if a tube is below specification or develops a fault.