Class AB amplifiers recently swept the board in the What Hi-Fi? 2016 Awards1 ‘Best Stereo Amplifier’ category:
What Hi-Fi? 2016 Awards: Best Stereo Amplifier
|Rega Elicit-R||Over £1,000 category|
|Rega Elex-R||£700 – £1,000|
|Cambridge CXA60||£300 – £700|
|Onkyo A-9010||Under £300|
We at Profusion were very proud to discover that the above all use Sanken Power Transistors in their output. This will come as no surprise to any engineer who has used Sanken power transistors, as they are designed for the best possible audio performance. Every transistor they offer has excellent linearity (hfe vs Ic), very low distortion and superb reliability. In general, the published figures are conservative, so expect better than rated performance.
To meet the more demanding applications, a number of additional technologies are employed.
Sanken’s proprietary LAPT and Base Island topology are used to prevent hot spots and current tunnelling (secondary breakdown). As a result, the transistors’ power ratings do not suffer with voltage, and they offer a wide area of safe operation.
Backthinning the wafer draws the heat away from the active junction more effectively, thus lowering the thermal impedance and increasing the power rating.
Thermal tracking diodes are included in the STD range, so that biasing can be thermally compensated, and distortion is minimised across the operating range.
For matching transistors to the right application, please see the table below.
|2SC4382||2SA1668||200V||2A||60||25W||Insulated package driver transistor|
|2SD2390||2SB1560||150V||10A||30,000||100W||Best for budget amplifiers|
|2SC3519||2SA1386||160V||15A||130||130W||Great linearity for mid performance|
|STD03N||STD03P||160V||15A||8,000||160W||Thermal tracking and thin die technology – best for high fidelity amplifiers|
|2SC3263||2SA1294||230V||15A||50||130W||Best for install and PA amplifiers|
|2SC6145A||2SA2223A||260V||15A||50||160W||High power, thin die technology – best for very high power class G & H designs|
|2SA3264||2SA1295||230V||17A||50||200W||Twin fixing with internal copper slug|
Value Added Services
For high end applications, Profusion can perform additional selection of transistors, to offer precise matching or higher voltage selections. For closer matched transistors, lower value emitter resistors can be used, which reduces output impedance.
Please contact us to discuss your requirements