KT88 6550 KT66 6L6 The Audio Beam tetrode review di Pasquale Russo

La prima guida al mondo sui tetrodi a fascio, dalla 6L6 fino alla KT88, passando per tutti i modelli intermedi.
Per ogni valvola sono indicate:
- le caratteristiche
- i valori
- i caratteri differenziali
il tutto corredato da moltissime foto a colori esplicative e dettagliate.
La guida è scritta in inglese, peraltro facilmente comprensibile.
330 pagine,oltre 300 immagini

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INDICE

Generality
History of the beam power tetrode 7
The tetrode 9
The internal structure of a true screen grid tetrode 9
The beam tetrode 12
The pentode 15
The harmonic and inter-modulation distortion 17
Valve characteristic curves
18
• The 6L6 Family
6L6 by RCA 24
6L6s by Others 42
VT-115 45
1614 46
1622 52
6L6G 55
6L6G branded by European makers 60
6L6GX 67
6L6GT 68
6L6GTY 69
VT-115A 70
CV1286 72
CV1947 73
Notes about the CV codes 75
6L6GA 79
6L6GAY 86
6L6WGA / 5932 87
6L6GB 95
6L6WGB / 5881 113
5881, a new beam power tube by C.E. Atkins 124
7581 133
6L6GC 148
7581A 163
350A 175
350B 176
6L6 Family: Ratings comparison 187
Summary of the 6L6 Family 190
Suffixes used in 6L6 Family 193
Notes about US makers codes 194
RCA date codes 195
Tung-Sol date codes 199
Sylvania date codes 199
GE date codes 201
Ken-Rad date codes
205
• KT66
GEC story 207
The early KT66 208
MOV/GEC KT66 1940-1950's 209
MOV/GEC KT66 1950's 210
Marconi KT66 211
MOV/GEC KT66 1960's 211
MOV/GEC KT66 1970-1980's 212
MOV / GEC factory codes 238
MOV / GEC date codes 239
CV1075 by GEC 241
CV1075 by Cossor 243
VT-75
244
• 6550
6550 by Tung-Sol 245
- Black plate period 246
• 1.th version 247
• 2.nd version 247
• 3.th version 248
- Solid grey plate period 248
- Three hole-grey plate period 249
6550 by Sylvania 251
Notes about Tung-Sol 6550s
253
• KT88
KT88 by GEC / MOV 263
• Early version 264
• 2.nd version 265
• 3.th version 266
• 4.th version 267
• 5.th version 268
Notes about GEC codes 269
Notes about GEC/MOV made in China 270
CV5220 288
The getter mirror question in GEC/MOV KT88s
289
• 6550 A
6550A by GE 291
• GE 6550A welded plates 292
• GE 6550A stapled plates 293
• JAN GE 6550A 294
• MPD GE 6550A 295
• 6550A / 6550 by Sylvania
Sylvania 6550A 305
Sylvania 6550 (Coke Bottle)
306
• 6550 – KT88 – 6550A ratings comparison 307
• Other KT88s
KT88 by Tesla 309
• Early version 310
• Late version (KT88S) 311
• RE 40 AK 312
KR – AVVT – New Emission Labs KT88s 313
KT88 by EAT 313
KT88 by JJ 314
KT88 by Sovtek 315
KT88 by Svetlana 316
KT88 by Svetlana winged "C" logo (SED) 317
KT88 by Svetlana "S" logo (New Sensor) 318
KT88 by Electro-Harmonics 319
KT88s made in China 320
KT88SC by Penta Labs
320
Alphabetical Index 322
References 327