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The PEARL Archive of Vacuum Tube, Loudspeaker & Solid State

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The PEARL Archive of Vacuum Tube, Loudspeaker & Solid State Web: http://www.pearl-hifi.com 86008, 2106 33 Ave. SW, Calgary, AB; CAN T2T 1Z6 E-mail: [email protected] Ph: +.1.403.244.4434 Fx: +.1.403.245.4456 Inc. Perkins Electro-Acoustic Research Lab, Inc. ❦ Engineering and Intuition Serving the Soul of Music The PEARL Archive of Vacuum Tube, Loudspeaker & Solid State Audio Technology Updated approximately monthly; this is Ver. 1.10, May 1, 2014. To obtain the most recent version of this document click here Click on blue text in the Volume/Section listings to be taken directly to the web page where the articles can be downloaded. HE FOLLOWING IS A COMPLETE INDEX of the arti- Titles of presently downloadable articles are Tcles contained in the P EARL Archive of Vacuum shown in blue text, clicking on which will take you to Tube, Loudspeaker and Solid State Audio Technology. the relevant page on our site. Presentl spanning 16 volumes that cover a wide range of topics, the ‘Archive is a collection of approxi- This latest release is expanded from the original mately 1,200 articles that chronicle the implementation intent back in the late 1980s to provide an extensive of vacuum tubes in the audio-reproduction chain from archive of only vacuum tube technology as imple- the late 1920s through to the present day. mented in audio to include the very large amount of While we might at some point make the entire col- information amassed up the present; early 2014. lection available on DVD, the scanning, page-by-page reconstruction and conversion to OCR-d PDF of at least 5,000 pages is a very time consuming project that will not be completed for some time. In the meantime articles can be downloaded indi- vidually and as Section and/or Volume compilations. Because it will take some three years at least to process and upload the entire Archive, we will update this document as we go. VOLUME 1: POWER AMPLIFIERS VOLUME 1: COMPILATION DOWNLOAD — 57 ARTICLES 505 Pgs. SECTION 1: AMPLIFIER BASICS — 16 ARTICLES 001 Volume 1; Section 1 — Compilation download 81 Pgs. 002 Puzzled About Amplifiers? Norman H. Crowhurst 4 Pgs. 003 Amplifiers Edgar M. Villchur 6 Pgs. 005 High-Power Audio Amplifiers M. Horowitz 4 Pgs. 010 Push Pull in Hi Fi M. Horowitz 4 Pgs. 015 Simplified Push-pull Theory—Parts 1 & 2 Julius Postal 8 Pgs. 020 Push-pull Audio Frequency Amplifiers K. R. Sturley 6 Pgs. 025 Circuit Features of High Fidelity Power Amplifiers Robert F. Scott 3 Pgs. 030 Circuit Features in Hi-Fi Power Amplifiers Robert F. Scott 3 Pgs. 035 Why Do Amps Sound Different? Norman H. Crowhurst 3 Pgs. 040 High-Power vs. Low-Power Amps Norman H. Crowhurst 4 Pgs. 044 Adequate Audio Power in the Home James Moir 5 Pgs. 045 Audio Power Requirements and Statistics C. Nicholas Pryor 3 Pgs. 050 Energy Distribution in Music John P. Overly 4 Pgs. ♦ AN 0.3 - Page 1 ♦ 055 Audio Designer’s Handbook—Parts 1 & 2 David Saslaw 11 Pgs. 060 Thoughts on Amplifier Design Stewart Hegeman 2 Pgs. 065 System Design Factors for Audio Amps M. V. Kiebert 16 Pgs. SECTION 2: ULTRA-LINEAR AMPLIFIERS — 24 ARTICLES 070 Volume 1; Section 2 — Compilation download 315 Pgs. 071 UK and US Ultra-linear Predecessor Patents Alan Dower Blumlein 9 Pgs. 072 Keroes Basic Output Transformer Patent H. Keroes 5 Pgs. 073 Keroes and Hafler Ultra-linear Amplifier Patent H. Keroes & D. Hafler 5 Pgs. 074 Keroes Ultra-linear Transformer Patent H. Keroes 5 Pgs. 075 An Ultra-linear Amplifier H. Keroes & D. Hafler 3 Pgs. 076 David Hafler Ultra-linear Amplifier Patent David Hafler 5 Pgs. 080 Ultra-linear Amplifiers: Parts 1 thru 3 Fritz Langford-Smith 15 Pgs 081 Ultra-linear Amplifiers: Parts 1 thru 3 with References Fritz Langford-Smith, et al. 68 Pgs 085 Ultra-linear Amplifiers Wireless Engineer 2 Pgs. 086 The Ultra-linear Power Amplifier Rudolf Moers 52 Pgs. 087 Optimized Electron Stream Web Pages Dennis Grimwood 105 Pgs. 090 Tetrodes with Screen Feedback Author Unknown 3 Pgs. 095 Amplifiers and Superlatives D. T. Williamson & P. Walker 5 Pgs. 100 Determining Screen Grid Dissipation in Ultra-linear Amps. Leonard Kaplan 2 Pgs. 105 Ultra-linear Operation of the Williamson Amplifier D Hafler & H. Keroes 3 Pgs. 115 Designing an Ultra-linear Amplifier Edward S. Miller 2 Pgs. 125 High-Quality Circuits John K. Frieborn 3 Pgs. 135 Adapting the Ultra-linear Williamson to 6550 Operation Herbert I. Keroes 4 Pgs. 140 A 50 Watt Power Amplifier David Hafler 5 Pgs. 145 120 Watts of Hi-Fi Power David Hafler 3 Pgs. 150 U. L. Operation of 6V6 Tubes David Hafler 4 Pgs. 155 New 25 Watt Power Amplifier Norman Kramer 2 Pgs. 160 A 60 Watt Ultra-linear Amplifier Author Unknown 4 Pgs. 165 The Ultra-linear II Author Unknown 2 Pgs. 170 40 or 60 Watt Hi-Fi Amp with Tertiary Feedback Thomas F. Burroughs 4 Pgs. SECTION 3: THE MCINTOSH UNITY-COUPLED AMPLIFIER — 15 ARTICLES 171 Volume 1; Section 3 — Compilation download; article 205 excluded 77 Pgs. 175 Description & Analysis of a New 50 Watt Amplifier Circuit F. Mcintosh & G. Gow 5 Pgs. 180 A New 30 Watt Power Amplifier S. Corderman & F. Mcintosh 6 Pgs. 181 Wideband Amp Coupling Circuits — US Patent; 12-1949 Frank H. McIntosh 12 Pgs. 182 Wideband Transformer — US Patent; 12-1949 Frank H. McIntosh 9 Pgs. 183 Wideband Amplifier — US Patent; 06-1949 Frank H. McIntosh 7 Pgs. 184 Amplifiers — US Patent; 05-1953 Frank H. McIntosh 7 Pgs 185 Making Electron Discharge Devices — US Patent; 10-1943 Frank H. McIntosh 9 Pgs. 186 Dome Loudspeaker — US Patent; 01-1975 Frank H. McIntosh 5 Pgs. 187 Compilation of Frank H. McIntosh US Patents Frank H. McIntosh 49 Pgs. 189 Realistic Audio Engineering Philosophy Norman H. Crowhurst 11 Pgs. 190 Hi-Fi at Low Cost with Twin-Coupled Amplifier Norman H. Crowhurst 6 Pgs. 195 Radio Electronics Twin Coupled Amplifier Norman H. Crowhurst 6 Pgs. 200 Updating the R-E Twin-Coupled Amplifier Norman H. Crowhurst 3 Pgs. 205 High Efficiency, High Quality AF Power Amplifier Alexander B. Bereskin 13 Pgs. 206 High Efficiency, High Quality AF Power Amplifier — w/Refs Alexander B. Bereskin et al. 40 Pgs. ♦ AN 0.3 - Page 2 ♦ SECTION 4: TRIODE-CONNECTED TETRODES — 4 ARTICLES 207 Volume 1; Section 4 — Compilation download 13 Pgs. 210 Triode Operation of KT88s R. M. Voss & R. Ellis 3 Pgs. 214 Pentode & Tetrode Operating Modes in Push-pull Outputs Renato Tancino 5 Pgs. 215 High-Power Triode Amplifier W. T. Selsted & R. H. Snyder 3 Pgs. 216 Pentodes & Tetrodes Operating as Triodes C. C. McCallum 2 Pgs. SECTION 5: CONSTANT-CURRENT OUTPUT STAGES — 4 ARTICLES 217 Volume 1; Section 5 — Compilation download 18 Pgs. 220 Constant-current Operation of Power Amplifiers H. T. Sterling & A. Sobel 6 Pgs. 225 Constant-current Audio Power Amplifiers H. T. Sterling & A. Sobel 4 Pgs. 226 Tube Applications in Amplifier Design H. T. Sterling 6 Pgs. 230 Constant-current D-C Amplifier Donald McDonald 2 Pgs. SECTION 6: THE WILLIAMSON AMPLIFIER — 4 ARTICLES 231 Volume 1; Section 6 — Compilation download 52 Pgs. 235 Wireless World Williamson Amplifier Reprints D. T. N. Williamson, et. al 43 Pgs. 239 Modernize Your Williamson Amplifier David Hafler 3 Pgs. 240 Improving the Williamson Amplifier Talbot M. Wright 3 Pgs. 241 The “Williamson Type” Amplifier Brought Up to Date M. V. Kiebert 3 Pgs. VOLUME 2: POWER AMPLIFIERS — CONTINUED SECTION 7: MISC. CONSTRUCTORS’ POWER AMPLIFIERS & DESIGNS — 19 ARTICLES 242 Volume 2; Section 7 — Compilation download 217 Pgs. 243 Building the Williamson Amplifier Herbert I. Keroes 3 Pgs. 245 Heathkit W-series Williamson Amplifier Assembly Manuals Heathkit Co. 114 Pgs. 247 Med-Power Tetrode Amplifier with Stabilized Screen Suppl Cullen H. MacPherson 2 Pgs. 248 McIntosh Unity-coupled Amp with Trifilar Output Xfrmr Hugh A. Lockhart 29 Pgs. 250 A Stable, High Quality Power Amplifie E. J . Miller 2 Pgs. 255 Universal Feedback Amplifier Circui Arnold J. Kauder 3 Pgs. 260 High-stability Feedback Amplifie Arnold J. Kauder 6 Pgs. 265 The 88-50: A Low-distortion 50 Watt Amplifie W. I. Heath & G. R. Woodville 4 Pgs. 270 A High Power Amplifier with Minimum Distortio Bruce DePalma 4 Pgs. 275 60 Watt Amplifier with a Silicon Rectifier Power Supp L. B. Dalzell 4 Pgs. 280 Another Power Amplifier R. A. Greiner 4 Pgs. 285 An Amplifier for $20.0 Arnold J. Gassan 3 Pgs. 290 Junior Golden Ear Amplifie Joseph Marshall 3 Pgs. 294 The Musician’s Williamson D. Sarser & M. Sprinkle 4 Pgs. 295 The Maestro: A POWER Amplifie D. Sarser & M. Sprinkle 4 Pgs. 300 40 dB Feedback Audio Amplifie B. Drisko & R. Darrell 3 Pgs. 305 Multiple-Feedback Audio Amplifie Joseph M. Diamond 2 Pgs. 310 The White Powrtron Amplifie Stanley White 3 Pgs. 315 Transformer Design for “Zero Impedance” Amplifier N. R. Grossner 5 Pgs. 320 Zero-Impedance Output Stage Raymond G. Anthes 2 Pgs. ♦ AN 0.3 - Page 3 ♦ SECTION 8: OUTPUT TRANSFORMERLESS POWER AMPLIFIERS — 6 ARTICLES 321 Volume 2; Section 8 — Compilation download 32 Pgs. 325 An Output-transformerless Amplifie -Speaker System Curtiss R. Schafer 4 Pgs. 330 OTL Vacuum Tube Amplifie M. W. P. Strandberg 4 Pgs. 335 Ultra-stable OTL Hi-Fi Amplifie Julius Futterman 5 Pgs. 340 A New Transformerless Amplifier Circui Kerim Onder 4 Pgs. 345 The OTL Amplifie V. Brociner & G. Shirley 4 Pg. 349 An Output Transformerless Power Amplifier — Oct 1954 Julius Futterman 5 Pgs. 350 An Output Transformerless Power Amplifier — Oct 1956 Julius Futterman 5 Pgs. 351 Transformerless 25 Watt Amplifie The Radio Handbook 1 Pg.
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