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  1. Designing an OTL / Circlotron
  2. Cayin A55t or AudioSpace AS-8i Mk.III
  3. filament voltage question
  4. 7236 vs 6AS7 ?
  5. Bias Circuit Calculation
  6. 6V6 Hum Issues
  7. Crossover co-axial
  8. Wurlitzer 6420 to audio amplifiers
  9. Advice on Parafeed Output Transformer
  10. mingda mc34ab mods?
  11. small and cheap OTL schematic needed
  12. ecl82 or ecl86 amplifier decision
  13. Well Here Goes... K16LS in Dynaco Chassis?
  14. Not too often you see one of those
  15. Sweet Peach vs Meng Yue EL84
  16. Attempt at giving back: 6L6GC SE amplifier
  17. Best Complete KT88 Amp Kit under $1K?
  18. Webcor Musicale OT puzzle
  19. Audio Research SP3a
  20. Preamp Conordīs with some malfunctioning
  21. Oscillating PSU above certain voltage
  22. B+ voltage load line question
  23. ming da tube amp smell
  24. Rebuilding my amp, would like some input.
  25. do any of these cv4024s seem genuine to you?
  26. Stupid question: EL34 tubes.
  27. PP with Unbalanced concertina = 2nd H?
  28. harmonic distortion
  29. Enhanced Tube's performance
  30. New GU50 SE: SRRP or Cascode for driver?
  31. Hivac XN11 tubes
  32. Conrad Johnson PV-10a hum. Any advice?
  33. Bob Carver's eye candy on eBay
  34. MFA Lumi started "motor-boating" today
  35. New GM70 tube with problem
  36. Interested in building together a 300B tube amp?
  37. cayin a-55t want to use el34
  38. Mc240
  39. Dht ?
  40. too much output impedance?
  41. College-proofing an ST-70 (aka autobias+ST-70)
  42. reverse polarity of the chinese goods?
  43. 6bg6 and 8k opt power amp project
  44. Need some calculation assist for a psu
  45. Baldwin Transformer Swap
  46. THD, s/n and IM noisy measurements
  47. Little dot 2+, got spark
  48. (INDIA) urgent - high-quality amp builders/techs in Delhi?
  49. What causes saturation in tubes?
  50. Plug and Play Power Supply
  51. GE 5814 and 12AUCIFTE
  52. Amplifier oscillates - advice sought
  53. 50s Amplifier
  54. power supply design question 832A amp
  55. Klimo power supply advice
  56. Earth Not Connected
  57. DC heater supply for phono pre
  58. Audio Note P2SE problem
  59. Aikido Transformers - Good Choice?
  60. Caps before or after MOSFET V-regulator
  61. Which capacitors should I replace?
  62. Testing Amplifiers
  63. Choosing choke valuein pre amp tube
  64. Supertriode with PNP transistors
  65. too much gain
  66. Lloyd's Vintage High Fidelity Audio Devices - both Tube and Solid State
  67. Cheap eBay "zoe_tsan" tube kits - worth anything?
  68. Bell Vintage High Fidelity Audio Devices - both Tube and Solid State
  69. Small Tube Amp with Hum
  70. tube rectifier question
  71. Unison Research S6 schematics
  72. vacuum tube amplifiers should be produced like this?
  73. 6d22s to 6cj3
  74. pot in tube preamp
  75. Mable Audio vs. Suppo audio sound quality
  76. swdfasdfsdf
  77. measuring heater voltage
  78. Need a circuit around these tubes.
  79. Single-Ended 13E1 amplifier
  80. Whats' the max allowable / reasonable ripple in SE amp?
  81. What amp kits are out there?
  82. ECC84/6N14P for audio
  83. PSU ignorant
  84. How to define a quality OT?
  85. Looking for some build advice
  86. ASC oil caps vs M-tube cap for ps
  87. SS CCS and distortion
  88. the valve with no markings
  89. Pentode AB1 design school???
  90. Capability of Sony/Tamradio SE Output Transformers
  91. my CELLINI triode amp
  92. 45-based SET -> Pass Labs F4
  93. Testing Amplifiers - Speaker or dummy load
  94. Quiet amp hums with signal source or input directly tied to star earth??
  95. amp output testing
  96. S5 Amp Comparison?
  97. How to Ground a Preamp PCB Board?
  98. RH807 / 6L6GC g2 issues
  99. 2010: Replacement for Black Gate WKZ 100uF+100uF 500V
  100. sunn solarus guitar amp
  101. Converting Dynaco ST70 Power Transformer for 12.6V
  102. Simple CF with 5687/6900/E182CC
  103. World Audio Design 5881 Schematic needed
  104. PP triode transformer load
  105. 6V6 PP load line
  106. Need help to under stand this 6n3 Kit from ebay
  107. Help:ampeg svt 2 pro 100v>>240v
  108. Blown left channel
  109. Tube preamp build help-heaters
  110. Medium Power SET, EL156 based
  111. Concertina Splitter question - Need help
  112. 6V6 amp - schematic options
  113. Lectron pa50+jh50
  114. 4pr60b valve
  115. Transformer phase splitter
  116. Help! ground hum
  117. Question regarding Leak Stereo 20 and 6SN7 line stage preamp
  118. Recommended upgrades for Yaqin Tube Buffer ?
  119. 6J5 or 6S4 mic amp?
  120. ST-70 build, ideas and advice
  121. Yaqin MC-100B Help Needed!
  122. Preamp Aikido : 6ax5GT,12au7,2c51
  123. Heater of tube
  124. R-Core Winders
  125. 1946 philco amp, tuner, record player
  126. otions for drawing tube schematics on Mac..?
  127. Push/Pull Plate Load Choke - how to figure Inductance?
  128. 6aw8-a tube question
  129. Newbie needs a point in the right direction
  130. Minimalist PL519 OTL?
  131. Telefunken schematics
  132. parallel pp EL84
  133. AD1 Operating Question
  134. 6П3С-Е Russian NOS: Gas Problem
  135. Favourite EL34 circuit
  136. Medium power SET with parallel OP tubes
  137. sds labs into Pas3
  138. Low voltage 6922 preamp...wanting a schematic
  139. Voltage Gain on Long Tailed Drivers
  140. Purpose of 5842 tube?!?
  141. MA XDSE KT88 vs YAQIN MC-100B KT88
  142. JBL Amplifier story
  143. Fender tweed pro-amp clone
  144. Recommended spacing for multiple 5AR4's
  145. Cap choices coupling
  146. Output transformer for PP EL34 source
  147. mini max pre
  148. use 2 ohm speakers
  149. Ask tube rect 5u4c and JJ caps
  150. Adding caps to prevent oscilation in AF 5687
  151. Williamson on EL84. Is it worth doing?
  152. CCS and regulated B+
  153. Garter cross-coupled feedback
  154. soundcard protection Z ???
  155. Using a CCS on SE Output Stage
  156. First amp build... help please!
  157. multiple independent grid biasing from 1 mosfet
  158. Eico HF-81 modification opinion
  159. 4K or 5K Output Transformer
  160. Noisy input on Michaelson & Austin TVA-1
  161. Precision Electronics S-35 help,
  162. Rogers Cadet 3 Problem
  163. Triode Electronics VS Hammond
  164. TRIODE OPERATION USING THE SCREEN GRIDS AS THE CONTROL GRID - this work ?
  165. Start up delay needed???
  166. Connecting a stereo amp as a mono-block
  167. HQ-DHT (All tube DHT amli) 26-45-2A3
  168. 24A tube in triode mode, help !!!
  169. Amperite Ballast
  170. Need super quiet 6.3V filament supply schematic
  171. (Sound Space)Houston 2A3 Power Amplifier
  172. James Burgess 2A3 Monoblocks
  173. Funny tube tale from southamerica
  174. RCA 7189 Black Plates
  175. Preamp nasty noise and hum
  176. EDCOR VS One Electron
  177. Parallel output tubes/valves in push pull. Advantages/disadvantages?
  178. Robinhood output transformers?
  179. looking for help diagnosing volume loss on tube amplified reel to reel player
  180. Question about power consumption Hagerman Cornet Octal
  181. valve rectifier in PSUD
  182. Can you explain what this is ?
  183. volume rise with frequency problem
  184. 1 + 1 = 3 :)
  185. What would the perfect multi-way speaker for a tube amp look like?
  186. GU50 compared with EL84
  187. 200- 500 watt Tube Amp project
  188. Counterpoint SA-4 manual and schematics
  189. Ever heard of a Valvo 16ECC ?
  190. the Reversal SRPP
  191. Want to build a C3G linestage
  192. 30A5 tubes
  193. Good speakers to match a K-12
  194. Driving Long Cables, how much current?
  195. twin triode question
  196. Am I going to blow up my 7189s
  197. How is wattage calculated when only using a single section?
  198. Counterpoint SA5 problems and a question.
  199. Headphone Amplifier 6922EH
  200. Fuse Clip for Small Plate Cap Use
  201. Advice sought on medium power triode for tube headphone amplifier
  202. Not the 111M; A Precise 116 Tube Tester
  203. Input stage
  204. Does anyone have any FFT plots from real Class-AB tube amps?
  205. Testing for a Damaged Output Trafo
  206. What has happened to WE Huntsville lately?
  207. Output Transformers Sun HCT 1003 KT
  208. Plexiglass case for small tubes?
  209. 100 Best Sound Tubes
  210. Input tube bias
  211. Build MARANTZ 7 line amp
  212. eschematic amplifier sinle end 12at7 6av6 6bq5
  213. Wiring - Audio Note Transformer Parallel Single-Ended 300B
  214. HV using zener diode
  215. Akai M8 rebuild up and running!
  216. Best current production 2a3
  217. what happens when plugging a stereo source into mono jack on a tube amp?
  218. Transformer coupled Gainclone idea.
  219. Audio Research VT100
  220. output transformer turns per volt
  221. valves and metal cones= bad mating?
  222. Why do you need a grid to ground resistor on a line stage?
  223. Need some help with RIAA Preamp
  224. Swapping transformer cores
  225. got hold of a bunch of tubes...
  226. output transformer secondary configuration
  227. WE/Ultrapath B+ Where?
  228. Blending 12ax7 parallel gain stages
  229. Sudden spark.
  230. Priboj Reborn
  231. Misunderstand of sijosae schematic
  232. 12AX7 Identification
  233. GM70 Datasheet Error!!
  234. Using old Hammond iron
  235. Need confirmation on LED bias for circuit
  236. Tone control problems
  237. Tube Parameter "Attenuation, Harmonic" What is it?
  238. Bias adjust on '65 Twin Reverb Reissue AB763 - 2004?
  239. Need HELP on Randall RGT100ES 6L6 to EL34
  240. Tube amp with Dual Triode
  241. Fisher X-101-C bias question
  242. DC Current-Regulated 300B filaments?
  243. Anyone ever use DC to heat rectifier tubes?
  244. Tantalum Resistor Watt?
  245. Help Choosing Power Supply Voltage Regulator Aikido Phono Amp
  246. Best sounding remote control volume
  247. plate and screen voltage
  248. 12AT7 plate voltage
  249. Latest LTspice giving crazy FFT results
  250. Dynakit PC-3A as a balance pre?