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  1. What is Simplest and Best 6550 PP What is Simplest and Best 6L6 PP circuit? (PK)
  2. My tube differential amplifier
  3. Helping a friend build a tube headphone amp.
  4. Tango XE-20S, tube option
  5. -follower with mosfet... how stable ?
  6. 5k or 2.5k for 6s45p
  7. minor hum problem
  8. Help to choose budget Tube Amp....
  9. Vao
  10. Help with tube-rolling 300b Ming-Da amp?
  11. EF184 pins 1 and 3
  12. aikido pre (5687 all in one) HUMM!!
  13. Question about tube datasheets
  14. EL84 "typical" amplifier
  15. Packing heat.
  16. Current rating for power transformer.
  17. Pentode Odd Behavior
  18. Lower Screen Voltage KT88, choke input + Cap input supply
  19. tannoy line trans
  20. Hi Gain Inverter for a PP amp
  21. Help looking for a project
  22. Dynaco MkIII bias flutter/stability...
  23. grid leak resistor?
  24. 16LS Stereo Tube Amplifier and how to connect to Baxandall Tube stereo tone control
  25. Fisher 800-C blown fuse
  26. testing 300B on Hickok 539B/C
  27. cathode bias imbalance
  28. DIY M60 OTL Power Amplifiers
  29. Invisible gain...Aikido content
  30. Vacuum Tube SPICE Models
  31. Tamura interstages
  32. Jolida 502/302b power transformer.
  33. Bogen mo-200
  34. Phono Circuit Noise Factor
  35. Input impedance of this headphone amplifier ?
  36. D3a preamp.
  37. Newbie needs advice about DIY project please!
  38. PSUD and Off load Voltage
  39. Help! AVO CT-160 Meltdown
  40. Groovewatt-Valve RIAA Phono Preamp?
  41. Mullard EL84 Reissue?
  42. Push Pull amp power supply question
  43. Aikido all in one 5687 tube pre / louder in right Channel
  44. AUDIO RESEARCH SP-6B TUBE AMPLIFIER
  45. Tube Amp
  46. Preamp Pentode Screen Voltage and Gain
  47. AUDIBLE iLLUSION m3A
  48. What "Class" amp is this?
  49. DC coupling
  50. DuKane 1A831
  51. Thump sound at turn off of a power amp
  52. DHT AC heating 120hz phase canceling
  53. REVOX Model 40 amp. Need some hand holding please.
  54. heater imbalance fixable?
  55. Headphone amp
  56. Speech Amp for Modulator
  57. 2.1 channel el84 amp help
  58. Identify PC board in little amp...
  59. dcpp vs sse vs spp? First build
  60. Spice model for GU50 (LT-Spice)
  61. Need schematic of Preamplifier AM 1065
  62. My Journey to build Tube power amplifier B300 SE
  63. Kondo M77
  64. tube datasheet gm
  65. xiang sheng best valves
  66. 6CN6/EL38 Replacement
  67. 4P55
  68. Possible or way to complicated?
  69. Jeff korneff SET 45
  70. Hickok 536 Calibration Procedure?
  71. P2p layout
  72. Heating tubes off mains voltage
  73. EL84 as preamp tube?
  74. Claus Byrith 4-30 PP with KT66
  75. biasing confusion
  76. Bogen HE-10 question
  77. Golden Tube Audio SE-100
  78. Nearing Conclusion of Line/Phono Project
  79. Bias Supply For Citation V?
  80. Tube Integrated Amp
  81. Help needed about a quad FM2 RF
  82. 21jv6 tube datasheet
  83. Interstage transformer theoretical phase change?
  84. Bootstrapping a high pass filter
  85. Help with hybrid Aikido amp! Suggestions please
  86. Need help with a Curcio Daniel 1
  87. Audio Tubes used in Industrial equipment?
  88. Hammond H1 Amp
  89. CCS assisted small signal UL pentode
  90. Dynaco ST35 B+
  91. Simple Tube Amp
  92. Portable tube amplifier
  93. Using the heater supply to get a DC source
  94. phono/aux switching problem
  95. What is the best EF86 in production at the moment
  96. 12AX7 / 12AT7 Mu Follower Phono
  97. Kreisler Stereo 6 speaker impedance
  98. A serviceable life.....
  99. TV 7 DU Tube info
  100. Twinings Tea Transformer Covers
  101. ECC88 with 12V heaters
  102. CXhange opa 627ap for an audio gd moon ?
  103. PP-EL34/6550/EL-PL504 or KT88 Bal. innput
  104. fatman itube mk1 sounds bad
  105. Chinese FD-71 tube is the russian GK-71 ?
  106. Leak stereo 20 diagnosis
  107. VTL
  108. Looking for tubed MC pre-pre
  109. Correct wiring types
  110. Couplates
  111. Op-Amp Like Line Preamp
  112. SE GU-50/6CB6 Pentode Design
  113. Pioneer SX34
  114. About metal film resistor in a tube tuner
  115. Looking for 52dBs or more MM phono
  116. Winter is coming... Time to start GM70 SE parafeed amp
  117. Doug Self: Wireless World Magazine Article Archive
  118. Relay short circuit
  119. EL34 PP oscillating
  120. Dynaco switchable diode/tube rec and driver tube mode
  121. CCS into a VR with Interstage question
  122. 6SN7-6V6x2 DC coupled 2 stage with stacked supplies
  123. Rectifier and DC filtering relationship question
  124. Class A2 6JD5 Curves
  125. Motorola HS-839 Amp problem
  126. Active valve monitors?
  127. Did I get this load calculation right?
  128. Convergent SL1 original schematic
  129. Bleed down resistor
  130. How do I calculate resistor value in this schematic?
  131. Easy question about tube data sheet
  132. Tube regulator question
  133. Tube amp build for an 1st timer.
  134. Full music 101d input tube/valve
  135. EZ80 Voltage Question
  136. What the heck is this? Bulb?
  137. Audio Note Kit 1 Upgrade
  138. Will this work? (EL34 PP)
  139. Anthem 1 intergrated amp
  140. Tubes and the sun?
  141. Two triodes cascaded cathode follower?
  142. HIRAGA PREAMP PHONO + line
  143. OB2WA Radioactive???
  144. 9 pin tube socket pcb boards with screw terminals
  145. Hai I need a little help on designing a power supply
  146. Tesla E83CC Frame Grid Tube Purchase - Legitimate Production or Fakes?
  147. Cleaning Up the Noise + Selector Switch Anomalie
  148. first tube preamp
  149. Rescuing a vessel : 1964 HICKOK 539C tube tester
  150. Dynaco Feedback
  151. Mundorf Silver Oil in hot 300B tube amplifier !!
  152. MULLARD 5-20 build with mods
  153. Choke loaded driver with small opt?
  154. Preamp Tube Bias and feedback
  155. New EL84 SE Amp PCB: The u-SE
  156. Question about Amp Theory
  157. Help needed for modifying DAC-opamp-tube circuit
  158. best way to start with tube amps
  159. Damper diode between C1 and L1
  160. Question about 'near' zero volt bias for low level stages
  161. Filmosound 179 - Should I even bother?
  162. Newbie question
  163. I think I know how it works, but can I get some help? (OddWatt PP)
  164. kt150
  165. As anyone considered black oxide???
  166. OTL question
  167. Headphone amp/preamp project.
  168. Comments or suggestions on this schematic?
  169. Twin Conn Organ 7868 Rebuild
  170. Favorite PP 6550 schematic?
  171. DECWARE Z BOX SCHEMATIC
  172. 6V6
  173. Need suggestion for eliminating noise from aluminum cover
  174. Kuba Serenade Stereo Console question.
  175. Help with tube interchangeability
  176. 6sn7(12au7)-6v6-300b
  177. Westinghouse tube amp MODEL V2508, conversion
  178. Voltage on the chassis, bad xformer?
  179. TubeCad blues...
  180. OPT as PSU filter???
  181. Tube Plate Voltage Timing
  182. Transformer grounding
  183. Two questions concerning bleed resistors
  184. Choke ratings and resistor values in choke input supply?
  185. Novar Spud :: A $200 sweep tube Spud with PCB
  186. Mid 50s 250/500/1000W Valve amp needs some repairs......
  187. I want to learn tubes and set up a workstation
  188. Pre amp wire up__new
  189. allied knight / rauland borg schematic needed
  190. Rollable Tubes
  191. n00b - Leave out the LEDs??
  192. Aikido 5687 all in one kit
  193. 6P13S - WHAT TO DO WITH
  194. el84 set amp for 90db-8ohm speaker?
  195. My first cap coupled 2 stage
  196. Dodd Buffer Tube Rolling?
  197. Lowest THD Tube Design Possible? (Need for a class, I realize it doesn't matter)
  198. Olson-Morgan 6F6 Amplifier Info's needed.
  199. Newbie, Help with datasheet
  200. Conrad Johnson MV55 again - and Hi from a newb
  201. Interesting one piece EL34 PP tube amp diy pcb on ebay
  202. Low power stereo (dual mono) tube headphone amp
  203. 6EJ7's vs. 6JC6A
  204. EL34s Frying in my Cayin A50-T
  205. Grid Leak Amplifier with Unexpected Heater Resistor
  206. 7617 tube data
  207. preamplifier with huge amplification
  208. Counterpoint Amp Output
  209. Phase inverter Gremlins in Philips EL6431 amp
  210. Russian to English Translation needed
  211. Concertina type Phase inverters?
  212. Double C-Core output transformers
  213. Amplifier slew rate and DSD playback
  214. Bypassing volume pot on Cayin integrated tube amp
  215. Distortion when change into ecc83
  216. Mighty Midget Problem (One channel is louder)
  217. Mullard ECL86 3W Economical Amplifier
  218. Building a Baby Huey EL84 amp - might need some pointers
  219. Tranformer Choice
  220. Heathkit WM-5
  221. Aikido preamp power supply
  222. identify this traffo
  223. transformers
  224. parallel tube amplifier.
  225. What to do with a 12" x 8" enclosure?
  226. Odd filament winding
  227. transformers
  228. tube choices for an ST70
  229. "Arabella" - 6EM7 amplifier on Acacia
  230. CDE acquisition of Orange Drop Brand
  231. What is this inductor?
  232. Counterpoint SA-5000 upgrade
  233. Homebrew tube preamp noise
  234. Cathode follower with 12ax7
  235. CPC Japanese Tubes ?
  236. Cary SLA-70 with KT88 - worth building?
  237. Opinions or comments on schematic please
  238. Is this a tie point or a diode?
  239. Pushing EL36 ??
  240. Power Supply Chokes Question ?
  241. First Post, Viking/T Eaton co Tube Amp Issues! *Pictures*
  242. Knight 40 W Amp. tubes correct? Location?
  243. Push-Pull Output Transformer with Cathode Feedback Winding?
  244. 300b amp help
  245. Help with Dynaco value
  246. INTERSTAGE 2A3/211
  247. TCJ Push Pull Amp Calculator question
  248. winter project KT88 PP
  249. En Vogue Darling SRPP SE SRPP tube amp will this work?
  250. Shunt regulation for HT

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