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
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| 300B Direct Heated Triode Amplifier |
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| 300B Monoblock Tube Amplifier |
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| 300B Monoblocks |
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| 300B Triode Amplifier |
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| 300B Class A Amplifier |
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| Low noise 300B DC filament supply with soft start |
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| Genalex 300B Tube |
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| Telefunken EL803S |
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| Telefunken Pentode |
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| 300B Amplifier Construction |
J&K Audio Design
25/11/2014
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