audioXpress: September 2004, vol.35, No.9

12" DUAL VOICE COIL SERVO SUBWOOFER SYSTEM 
Update & construction details of the author`s servo sub with dual voice coil driver. By D L Ferguson

SAGA OF A OTL AMP 
Revising a classic amp with power supply and amp circuit mods for today`s use. By Glen Orr

FILAMENT AND HIGH VOLTAGE POWER 
Moew interesting data about filatments, heaters and high voltage power provision. By A J Van Doom

ROOM CORRECTION, PART II 
How speaker placement and listener positioning affect response. By R Aleksandersen

THE "MCUTRACER", PART II 
this tube/transistor curve tracer offers lots of flexibility to analyze the characteristic curves of tubes and transistors. By J Walton & M Hebel

SELECTRONICS GRAND MOS SILVER DESIGN AMPLIFIER 
By Charles Hansen.

LISTENING TESTS: SELECTRONIC TRIPHON II QUAD AMPLIFIER 
By J and S Schubel

NEW CHIP ON THE BLOCK
The Silonex Audiohm by C Hansen

BOOK REVIEW
Sound Recording Advice

• KEY TOPICS
• 12" voice coil sub
• OTL mods
• Filament & high volts power
• Tube/transistor tracer
• Room correction
• Selectronic Grand Mos amp
• BOOK SPECIFICATION
• paperback
• black and white print
• 72 pages
• 205mm x 267mm
• 170g

Price; £5.50 +vat +p&p