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2 x 10 Watt 300B Class A Power Amplifier
Features:
- Toshiba 6CG7 for the transformer-coupled circuit driving PSVAN 300B ended-tube optimally
- Specially designed non-feedback amplifier by adopting triode tubes in all stages
- Output transformer and inter-stage transformer made by LUNDAHL in Sweden
- Two independent power choke transformers
- Specifically designed to decreasing noise
- Rectifier tube 5R4G which does not generate a switching noise in principle against a high voltage power supply
- Rectifier circuits composing of choke transformers
- 300B heaters directly driven by DC power supplies
Specifications:
| Product | 300B Single-Ended Monaural Power Amplifier |
| Input impedance | 47k ohms |
| Gain | 26dB |
| Residual noise | 200µV or less : A-NET |
| Rated output | 10W or more (THD：5%) |
| Frequency characteristics | 10 – 40kHz (+0,-3dB) |
| Output impedance | 4 ohms, 8 ohms |
| Power consumption | 100W (100VAC 50～60Hz) |
| External dimensions (mm) | 245 (W)×226(H)×427(D) |
| Weight | 16ｋｇ |
| Accessories | AC power cable |
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Complete with all original packaging retails for £5495 selling for £4495
• KT170 Valves
• Remote Control
• Large OLED display
• Blue Velvet ALPS motorized potentiometer
• Connectivity and extendibility through I/O Upgrade Modules
• Sophisticated protection and bias monitoring system
• No feedback design
• SRSG® implementation
• Gold plated Teflon RCA connectors
• Gold plated tube sockets
• 5mm aluminum face panel with luxury painting
• Five years guarantee
Ex-Dem Pass Labs XP-22 Preamplifier
The new design uses double-shielded low noise toroidal transformers in external supply
The new design uses double-shielded low noise toroidal transformers in an external supply connected via aviation-grade circular connectors using silver over oxygen-free copper. The power supply is dual mono with two transformers with lower radiated and mechanical noise. Noise is the most prominent part of THD+N at low levels, so by lowering noise we get better resolution and dynamics.
The gain circuitry continues to use our favorite transistors from Toshiba but has a larger, higher biased, output stage like the Xs Preamp, and includes auto bias.
The larger output stage makes longer, and multiple cable runs easier to drive and gives us the advantage of simplifying our single-ended output circuitry while increasing performance.
The volume control is a single stage instead of two stages and has more range; it is quieter and more accurate. This is the same volume control as used in the XP-30.
Overall this makes for a quieter, more neutral, musical, and versatile control center for your system.
The XP-22 measures spectacularly well — but it really stands out sonically.
Ex-Dem Thivan Labs 211 Gold Swan Integrated Amplifier
- 1 unit ex-dem
- Please enquire for shipping cost if outside the UK
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First Watt F7 Power Amplifier
The F7 is a very unique power amplifier.
Aa two-stage push-pull JFET/MOSFET topology with fewer parts than any First Watt amplifier to date and incorporating a very interesting balance of very low negative voltage feedback and a little bit of positive current feedback to give an astonishing measure of control over reactive loudspeaker loads.
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The previous three designs used Silicon Carbide to make a custom vertical power Jfet with a low impedance Drain whose character nicely emulated a power Triode tube, but directly operating at the current and voltage that would drive loudspeakers without the requirement for an output transformer.
SITs lend themselves to high quality audio performance with very simple Class A circuits with little or no dependence on other active circuit elements or negative feedback.
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