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Sep 19, 2026 | 0 comments

2A3 and 300B Push-Pull Output Transformers: A Practical S...

PUBLISHED BY IWISTAO · Tube Amplifier Engineering Plate-to-plate impedance, DC balance and full-power bandwidth for directly heated triode amplifiers. A useful specification for a 2A3 or 300B push-pull output transformer...

Shuguang 274B Rectifier Tube 1 Piece Full-Wave High Vacuum 5V for 300B 2A3 Tube Amplifier HIFI Audio DIY

Sep 14, 2026 | 0 comments

274A vs. 274B vs. 5U4G vs. 5R4GY vs. 5AR4/GZ34: Rectifier...

PUBLISHED BY IWISTAO · Vacuum Tubes · Technical Guide · V2.1 Voltage drop, current capability, first-capacitor conditions and their practical effects on a 300B power supply. The 274A and 274B...

Sep 11, 2026 | 0 comments

Vacuum Tube Matching: What Matters and How to Choose a Ma...

Published by iwistao · Tube Audio · Technical Guide What to match in preamp and power tubes—with 12AX7 and EL34 examples and the consequences of mismatch. Contents What Does Tube...

Sep 08, 2026 | 0 comments

HA12016 FM Stereo Decoder: How It Works and What Its Spec...

PUBLISHED BY IWISTAO · FM Radio Technology Pilot-tone decoding, measured specifications, careful alignment, and a three-way comparison with LA3401 and Toshiba TA7343AP. Contents What the HA12016 does Inside the FM...

Sep 07, 2026 | 0 comments

Tang Band W8-1772: Specifications, Enclosure Design and S...

Published by iwistao · Loudspeaker Engineering A practical guide to this 8-inch full-range driver, the official SUG1-19 horn, IWISTAO’s 27 L empty cabinet and system matching. Contents What is the...

Sep 06, 2026 | 0 comments

Musical Fidelity MX-Stream: A Practical Guide to USB Netw...

Published by IWISTAO · Digital Audio Connections, Roon integration, bit-perfect playback and the checks that matter when pairing a streamer with your DAC. The Musical Fidelity MX-Stream is a network...

Sep 05, 2026 | 0 comments

FM Radio Tuning: Air Variable Capacitors vs. Electronic T...

September 5, 2026 · Radio Engineering How mechanical tuning, varactors, and PLL synthesis work—and what they can tell you about reception and sound. Contents What tuning changes in an FM...

Sep 03, 2026 | 0 comments

2SA970 and 2SC2240 Are Obsolete: How to Choose Safe Moder...

September 4, 2026 · Audio Electronics · Version 2.1 KSA992 and KSC1845 are practical starting points for many low-noise audio stages, but current rating, gain, pinout, bias, and circuit function...

Sep 02, 2026 | 0 comments

The Western Electric 755A: Anatomy of an 8-Inch Full-Rang...

PUBLISHED BY IWISTAO · Loudspeaker Drivers Why a 1947 voice-reinforcement driver became one of the most coveted full-range units in high-fidelity history — and how to get the best from...

Aug 31, 2026 | 0 comments

Rogers AB1 Bass Extender: The Engineering Behind the Lege...

Published by IWISTAO | Vintage Hi-Fi | LS3/5A Engineering Few loudspeakers have achieved the legendary status of the BBC LS3/5A. Its extraordinarily natural midrange, precise stereo imaging and ability to...

Aug 30, 2026 | 0 comments

Carlsson Speakers: The Ortho-Acoustic Idea That Made the ...

A practical history of Stig Carlsson's Ortho-Acoustic loudspeakers, from the Sonab OA-5 and OD-11 to the wall-coupled OA-50, OA-51, and OA-52.

Aug 18, 2026 | 0 comments

Full-Range Speaker Notch Filters: Correct Topologies, Mea...

published by iwistao · Audio Engineering An LCR network can correct a narrow response peak, but only when the complete source, filter, and driver circuit is designed together. A full-range...

Aug 09, 2026 | 0 comments

How Driver Parameters Determine Full-Range Speaker Dimens...

Published by iwistao · DIY Audio The nominal diameter is only a size category. Actual frame, cutout, mounting, and depth dimensions determine whether the driver fits the baffle; Thiele/Small parameters,...

Aug 07, 2026 | 0 comments

Building a JBL 2420 External Wooden Horn for 12- and 15-I...

Learn how to build and integrate a JBL 2420 wooden horn module with 12- or 15-inch full-range speakers — covering inspection, crossover, placement, and measurement.

Jul 31, 2026 | 0 comments

JBL Control 328C: From Commercial Ceiling Speaker to DIY ...

Published by iwistao · DIY Audio What makes this 8-inch coaxial compression-driver system unusual, why it attracts Ojas-inspired builders, and what to verify before designing a cabinet. Table of Contents...

Jul 29, 2026 | 0 comments

How to Choose the Right Vacuum Tube Amplifier Output Tran...

PUBLISHED BY IWISTAO · TUBE AUDIO ENGINEERING Selecting an output transformer (OPT) is one of the most consequential decisions in a vacuum-tube power amplifier. The OPT reflects the loudspeaker load...

Jul 27, 2026 | 0 comments

Parallel-Feed (Parafeed) Output Transformers: A Practical...

Published by iwistao · Tube Audio Engineering How splitting DC and audio current across two magnetic parts changes the trade-offs of single-ended tube amplifier design. In a single-ended (SE) vacuum-tube...

Jul 22, 2026 | 0 comments

CSR (Qualcomm) Bluetooth Chips and Their Bluetooth Versio...

PUBLISHED BY IWISTAO · Technology / Wireless Audio From the BlueCore era to the Qualcomm QCC and Snapdragon Sound platforms — which Bluetooth specification each CSR / Qualcomm chip implements,...