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  1. New tube seemed fine then low emission
  2. Tube LTSpice Model
  3. Bellari RP533 Question
  4. Deleted tube amp article?
  5. 300B Recommendations
  6. JJ vs Gold Lion KT77
  7. Rectifier tube kills power transformer?
  8. 300b 845 amp project
  9. 60W With Sweep Tubes, Different Topology
  10. Where can I find cheap power transformers for EZ81?
  11. 8102 Tube data
  12. Weird amp ideas with TV tubes and old mains transformers.
  13. Ultra linear 33% vs 43%?
  14. Best "minimal" amplifier circuit
  15. Tube Amp Hiss Puzzle
  16. Need recommendation...
  17. Frankenstein Dynaco MK VI
  18. 12AX7 SE baby amp
  19. Time to move on from the Antitriode
  20. Pye Mozart HF10 input impedance?
  21. Fab Four: 4 x KT150 monoblock
  22. Pictures worth lots of words, but how does it sound??
  23. Plate-Grid vs. Plate-Cathode local NFB - Is it the same?
  24. Electrostatic screen in OPT. Is there any benefit?
  25. 12AU7 (pre) burned out my amp
  26. One blown 6550C out of four- how many to replace?
  27. current mirrors in LTPs
  28. to amorphous or not traffo discussions
  29. Nature of the Audio Research LS5 MKII
  30. EL34/KT66/6L6 push pull pair monoblock project
  31. Common Cathode Choke discussion
  32. so we agree that to a very good approximation air core xfmr are linear
  33. EL156
  34. yaqin MC-13S
  35. Does anyone know Ian Cunningham?
  36. Balanced circuit topology
  37. Tony's TABOR amp clone build log.....
  38. Hammond 193A, 200H @ 40mA choke
  39. Heater question: connecting indirectly heated with directly heated
  40. More on Output Stage Local Feedback
  41. 12au7 info needed
  42. Filament transformer center taps
  43. Counterpoint SA-5000 Power Supply Problem
  44. Sonic Frontiers OTs
  45. Grundig 4085, rebuild starting
  46. Testing Power Tubes in the Lab / Tung-Sol 7591A Data
  47. Tube DIY project recommendations
  48. Quietest 6BQ5 or EL84 Tubes
  49. Parmeko opt transformers
  50. Changing Gain in Two-Stage Tube Circuit
  51. Crosstalk / grounding in dual mono
  52. Adding passive tone control??
  53. EL802 tube giving strange noise.
  54. Amp Popping, Very Hot Resistors?
  55. Novarria transformer help (TU-27)
  56. Please recommend tube amp repair/modification services in Nederlands
  57. Chassis Hum
  58. Rickard Berglund 845 driver (Sound Practices 94/95)
  59. New Build: Triode connected PP KT88/6550
  60. best load 211 PSET with low impedace speakers
  61. Basic Question: Lightning inside 6550
  62. Tube push-pull amp with deficient frequency response
  63. Choosing an UL output transformer
  64. Battery valve AF amp - feedback to one end of filament.
  65. odd tube
  66. 12au7 identification
  67. Modeling 300B SETs with LTSpice
  68. UX-226 ltspice model
  69. Counterpoint SA-5
  70. 6CB6 vs 6C9
  71. UTC ratings
  72. Need help to determine 3 12AX7 tubes for my vincent amplifier
  73. 212E amp
  74. High Power Tube Amplifier
  75. I need help with a Dynaco SCA 35 project, please
  76. P-P with EL34/KT120
  77. Push pull EL34 need help on parameters.
  78. vacuum tube power amplifier 2 x 50 W
  79. Columbia 6L6GB Amp - I do not understand this circuit
  80. Need help identifying a power transformer windings
  81. A bit OT: what was your diploma project?
  82. West Sacramento tube amp help
  83. Umbilical Suggestions
  84. Interferences between amplifier and network player
  85. ELL80 tube amp
  86. Is it a good idea to delay the HT?
  87. Merlin RIAA Preamp
  88. Taking apart a 6AU6a
  89. Woodworker seeking Tube amp builder.
  90. My take on OTL OCL headpone amp
  91. Parallel 01a line stage
  92. Anyone with a tube tester near Charlotte, NC?
  93. EICO HF-81 front-end question
  94. KORA Mercury Schematic Diagram - LORLIN Rotary Switch replace by ELMA 04
  95. How to size an SE OT with CCS plate load?
  96. 1958 Pioneer SM-c800 Hiss Trouble Shooting
  97. Cary 300b SEI help
  98. Audio innovations 500 capacitor replacement
  99. CCS on Loftin White driver?
  100. Any guesses on this tube
  101. Current best DIY preamp?
  102. Left my amp on without speaker for hours
  103. Sphinx Projekt Four Tube preamp schematic
  104. Question on interstage transformer with class D drive
  105. Success or problems with ferrite beads / rings as stoppers?
  106. turn an OPamp design into a tube one
  107. Troubleshooting Sansui AU-70 preamp hum
  108. Soviet 6V6 tube question
  109. Battery powered Subminiature tube amp for high Z headphones
  110. Build Log: P Millett's DCPP "Engineer's Amp"
  111. Pilot Preamp
  112. SS->Vacuum Tube Hybrid Test - Insane but worked
  113. I hope this is the right forum... big amp with output xformers
  114. Aikido PH-1 Phono Stage and PS-1 Project.
  115. I need someone with a tube-tester in the Greater Boston area...
  116. Why is this a buffer?
  117. Looking for schematic: Radii Audio MPP6BM8S
  118. Dual 9-pin Triode 12ax7 and 12au7
  119. Power supply for a limited bandwith SE amp
  120. Using a relay to protect the output valve if grid bias supply fails
  121. Yuan jing 6n3 tube preamplifier - silly blue lights / leds
  122. Push Pull Class A OPT design
  123. attenuator for negative feedback help
  124. Cary Audio 300b se amp
  125. Inductor coupled Preamp
  126. Johan Potgieter's Hallé
  127. My adventures with shunt regulators
  128. Luxman MQ68C tube substitution - potential for Screen Drive?
  129. Antique Sound Lab AQ-1001DT woes
  130. Mystery tubes?
  131. QE08/200-D3a Se-ClassA-Triode connected
  132. Bias servo for class AB
  133. Shine7 E88CC Tube Preamp
  134. El Cheapo Amp Power Supply Questions
  135. Sub 8068 for 807 in series pass
  136. Bias trim calculation spreadsheet
  137. SHAX project - the true flea-power... though a true PP Amp too
  138. KT120 producers: only TUNG SOL?
  139. How to reduce Gain? 1st stage Triode
  140. SS voltage regulator kit
  141. Tube circuit drawing software ?
  142. How to connect a pentode in tetrode mode?
  143. weird centertap connection
  144. Loss 4.5dB at DC coupling RIAA filter
  145. Help with drawing load lines for 45 output stage
  146. Tubes glowing pulsing. is this a problem?
  147. Can I convert self bias to Fixed?
  148. Floating ground dual class amplification A + B/C/D/etc...
  149. Misty- SE 1625 Triode Strapped- Newest Build
  150. Identification of Amperex 12AX7A ECC83
  151. EL34 plate voltage & biasing current.
  152. Douk Audio U202 headphone amplifier - real or fake tube amplification?
  153. 2A3 vs 300B Stuck at a fork in the road.
  154. New tube DIY'er with an HK A300
  155. 2 Half Wave Rectifiers vs 1 Full Wave Rec
  156. JE Labs 76 6sn7
  157. Audioramy 828A/FU29 still mains hum after ground lift
  158. The ISO-Tango transformers reborn in ISO Transformers
  159. 6922/6DJ8 Operating Point???
  160. VTV Octal (6SN7) Line Stage Build --> Mod
  161. TL10/KT61
  162. Anyone recognize this transformer manufacturer?
  163. A look at some Electrophoresis HV power supplies
  164. What wire to use for top caps (plate voltage)?
  165. Help with class A hybrid headphone amp project
  166. 6P1P, LM317 CCS cathode bias weird issue.
  167. Newb question on Cathodyne Phase Inverter
  168. 6080 regulator
  169. Reworking 6SN7 Line Stage Preamp
  170. Copper belly belt on SE OPT
  171. The Tube Fates Have Smiled Upon Me
  172. 25DN6 Magnet
  173. Driver tube recommendation
  174. HF-87 Rebuild help
  175. Odd Watt Audio Alpha Build and initial review
  176. Need Help by e80cc tube premp
  177. scott 299d phono tubes
  178. Bare bones first tube "build"
  179. Theory of Western Electric Harmonic Balancer explained
  180. Telefunken EB III
  181. Odd issue with first turn-on
  182. help for new project
  183. Identifying Svetlana KT88 tubes
  184. Life span of 6AU4GTA?
  185. K-12G Edcor Power Trans. upgrade issue
  186. Help about tube
  187. Mod 805 based amp without anode cap
  188. 6MD8 triple triode utilizing separate bias
  189. Help find a valve power amp project
  190. Capable Electronics Advice required please
  191. 813 Filament Question
  192. Aikido LV: Wall wart ripple & rc filter
  193. Solid state current limiters instead of screen resistors
  194. Opinions wanted…..
  195. A Bit of Confusion Over Berning EA 230 Output Transformers/6JN6 Push-Pull
  196. Antenna Lead Directly to Plate of Detector Tube
  197. Amplion Amplifier
  198. Tube ID
  199. Heathkit Transformers for 7591 Amp, opinions wanted
  200. Noise and oscillation problem ECC802S pre
  201. Mains transformer Secondary 0v grounding
  202. dirty sound
  203. Toroid.pl SE transformers any good?
  204. Filament tap for 5y3
  205. 6SN7 Linestage with 6EM7 Regulation
  206. Beginner looking for first build- 4x EL34/12ax7
  207. Cayin SC-10
  208. How to apply local feedback
  209. Haltron 6V6GT who made these?
  210. Conjunctive filter question.
  211. Audio reserach ref 3 hiss and pops/Lampizator
  212. crossover distortion and other questions (first timer)
  213. Peters Mighty Midget tube amp
  214. Electro/Mechanical Volume Switch
  215. 6L6 quad push pull monoblock project
  216. Advice on 6550's
  217. Question on OPT secondary impedance selectors
  218. New Tube Amp Problem (help plz!)
  219. Sansui 500a. Restore or?
  220. 3B28 DC filament current?
  221. AMC CVT-3030 shooting from speakers, blowing fuse
  222. Linkwitz transform w. tubes?
  223. 6SL7 in SRPP w/o heater elevation
  224. McIntosh C20 Volume pot help
  225. Audio Research Classic 150 mono-bloc
  226. 300B filament outage
  227. Lab mains transformer?
  228. Differential amplifier with DH tubes
  229. My CJ PV2AR pre - why did they sub these transistor diodes in ?
  230. PS Transformer Wiring: Aikido PH-1 + PS-1
  231. SE807 Triode Dick Amplifier Questions
  232. Is it sufficient. voltage source vs tranny model in LTSpice??
  233. HV tube for A1 low mA
  234. Audio Research D150 hardwiring
  235. Pi Filter before Shunt Regulator?
  236. Improvements in this riaa tube
  237. SRPP preamp - Rk calculation
  238. SE output with PP transformer
  239. External CCS
  240. Testing tubes some simple way?
  241. Is ECC86/6GM8 a Direct Plug-In Swap for ECC88/6DJ8 (@ 30
  242. 8106 Tubes
  243. using old tubes first time
  244. A reasonable way to use these bits and pieces?
  245. Engineer's Amplifier transformers
  246. Yaqin MC100B Dead, need help
  247. Question on tube substitution
  248. Reaching max Rect. Current and amp needs more gain.
  249. HELP: Converting amp to accommodate 12AU7 and 6CG7
  250. Need Assistance with Carver Classic Tube Preamp

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