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Tuesday, November 25, 2014

300B Tube Amplifier

J&K Audio Design 300B Tube Amplifier

Here's another lovely 300B tube monoblock amplifier that we've made for a local audio enthusiasts. As what we always do, our designs are always extraordinary and is not done elsewhere. This is a very unique design that fully maximizes the capability of the 300B tubes that uses 5687 as pre-amplification stage and Telefunken EL803S as driver. Here are some highlights:

  • Telefunken EL803S driver for tone and control
  • Low noise LT1083 300B DC filament supply with soft-start function for absolute quietness and safety
  • High torque, critically damped, tube rectified pseudo choke input B+ power supply for excellent low frequency response and driver control
  • Stepped attenuator with Dale resistors - super accurate and stable imaging
  • Grid choke application for pre to driver stage - wide bandwidth low frequency extension
  • Carefully selected high grade components - optimized tone and body
  • Special tweaks at mains input for low noise operation - super dark clean background
  • Z11 overspec power transformer and Z11 choke - super dark clean background
  • Cobalt SiFE 40W double C core output transformer - tuned for optimized mids to low bass response
  • Teflon and high grade ceramic tube sockets
  • 5X4G and 5U4G interchangeable tube rectification
  • 3MM turret board for component mounting - absolute vibration control for components
  • Full aluminum, rigid chassis - non-magnetic and rust proof with 5MM front plate
  • J&K proprietary grounding scheme - zero hum and noise even if ear is placed near high sensitivity speakers (ex: Zu Audio Soul Superfly with 100dB/w/m sensitivity)
  • J&K proprietary tuning for mid to low frequency resolution and extension 

300B Direct Heated Triode Amplifier
300B Monoblock Tube Amplifier
300B Monoblocks
300B Triode Amplifier
300B Class A Amplifier
Low noise 300B DC filament supply with soft start
Genalex 300B Tube
Telefunken EL803S
Telefunken Pentode
300B Amplifier Construction

J&K Audio Design
25/11/2014

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* Finished amplifiers, DACs, audio gadgets, upgrades and repairs - this is not our core business and we do it out of passion. We do not have fixed models, fixed price and we customize for each individuals. The sky is limit of creativity.  
* Our product lines are always improving and increasing. If you do not see what you want, contact us!  
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Level 0: link 1

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Level 3: depends on type, size and complexity. Email us for details.

Iso-trans: link 1, link 2

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* Finished amplifiers, DACs, audio gadgets, upgrades and repairs - this is not our core business and we do it out of passion. We do not have fixed models, fixed price and we customize for each individuals. The sky is limit of creativity.

* Our product lines are always improving and increasing. If you do not see what you want, contact us!

* Please email for volume discounts, distributor and OEM pricing.

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