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  1. tube cathode bias question: resistor / diode
  2. Silicon Chip mag "Currawong" amp
  3. Vibration spec of 6L6GC ?
  4. Output Transformer Question
  5. 6V6/6l6/EL34/KT66/KT77/6550/KT88 Primaries/ input/loads
  6. Question about HK Citation V schematics
  7. Multi-purpose Tube Preamp - need some help
  8. Vacuum Tube Workshop
  9. Constant Current Heater Source
  10. Tube amp channel loading
  11. Sexy Westra loudspeakers looking for a match
  12. KT90 parallel push pull design
  13. Beard P100 mk1 owners? And some questions.
  14. Hybrid OTL amplifier
  15. heater issue?
  16. negative bias supply
  17. The hardest part about a DIY tube amp is.....
  18. 6N2P-EV driving 6C33
  19. DIY THD Tube Tester / Analyzer
  20. 2.3 watt x 4 or 5 watt x2 SET amplifier using DECWARE Zkit1 and Zkit4 schematics
  21. Cathode follower topology
  22. Line level connected direct to split phase on EL34 PPP?
  23. 13E1 Stereo Single Ended Amp
  24. Apex PA94 Opamp Power Tube Driver
  25. STEM Amplifier Final Pre-Build Checkpoint
  26. thoriated tungsten triodes tetrodes pentodes
  27. BAT-VK 60 Pls help need repair ;(
  28. Switching on an old amplifier?
  29. elevated filament voltages
  30. Opinnions on Gold Lion KT77
  31. DIY Tube amplifier, Transformer question.
  32. Pro reverb AA165 circuit low output from vibrato channel
  33. EF42 for audio applications
  34. strange Tungsram tube
  35. Schematics TVA Mentmore M100 M200
  36. A Thordarson amp project
  37. Help: Tubes for my amp
  38. McIntosh mc40 power transformer
  39. Counterpoint SA-1 preamp schematics?
  40. What would a larger OPT get me?
  41. National VP-311C Tubescope help...
  42. 12AU7 - 12.6V DC heater wiring - noob
  43. I bought a box of tubes at an estate sale today
  44. Thermistors to prevent heater current inrush?
  45. can SE bass be as good as PP ?
  46. 2A3 cathode resistor/cap question
  47. class a output ct basic question
  48. Recent popularity of Leak TL-12
  49. bleeder resistor placement w/ power supply choke
  50. cd burner hum w tube stereo
  51. Clipping - Saturation or Mismatching Impedance?
  52. Transformer for K12g tube amp
  53. PowerTrannyHeatRemovalViaHeatSinkRadiatorPassive
  54. "Novel" push pull driver circuit
  55. Feedback lead/lag compensation
  56. ASC Metal Polypropylene Caps
  57. help with Signature Technology mono amp
  58. 7591
  59. EL34 integrated amp power loss
  60. Use treble or bass amp for midrange?
  61. Question about a SET 2A3/45
  62. western electric 124 amplifier
  63. el34 power loss in right channel
  64. Ei Silver Plate 12AX7 cathode color ?
  65. Does parafeed really improve sound?
  66. Can I use this choke
  67. Calculating 6922/E88CC/ECC88 cathode follower for 90V anode
  68. ST70 coupling caps eyelet location on PC-3?
  69. Some help with PCL86 Headphone amp Project
  70. Top (sound) quality valve phono stage
  71. Calculating cathode follower using 12AU7 for 90V supply
  72. Cathode resistor
  73. Help with an old Capitol
  74. Cathode bypass cap
  75. balanced post-OT line output?
  76. Blown SE mono, troubleshoot
  77. What is this circuit for?
  78. Siemens EL 86 NOS?
  79. Valve Operational Amplifiers
  80. What will be the best drive to 211 tube?
  81. Dual 845 SE A2 questions
  82. Harman Kardon Citation I, II, & III (Special thanks to Jim McShane and Eli Duttman!)
  83. Heater rewiring from 6N2 to 12AX7 with 6.3VAC
  84. heater bias value
  85. the hum or is it a siliconray kit
  86. DC Automatic Bias Control - Auto fixed bias
  87. What makes an OT a good OT for audiophile and need suggestion.
  88. The totally capless DHT SET amp - 300B or others
  89. Angled Socket brackets?
  90. Octal or loctal tubes as cathode follower?
  91. Used int amp please help to figured out?
  92. Rod Coleman heat sink question
  93. Tubelab SE + Fostex fe206en vs room size! suggestions needed please!
  94. ef86 pentode/triode switch: voltage rating?
  95. Input to pre-amp
  96. EML 300B
  97. Need suggestion in building a stereo power amp
  98. VALVO EL84 and ECC83 TELEFUNKEN ID?
  99. Bogen E-75 tube amp
  100. Quad II amplifier needed for parts
  101. Low voltage 6N1P RIAA?
  102. Does anybody collect vacuum tube ADV
  103. HDMI connection causes hum on Quad 303
  104. ECC81/12AT7 "sweet spot"
  105. Phono Preamp Hum
  106. Benefits of high voltage source for preamp
  107. Auto Bias
  108. Thomas Mayer Sound Processor pics
  109. Have you used the 15A6 pentode as an audio output tube ?
  110. Can I use a 5 volts tap for 6SN7 heaters?
  111. Any opinions about this tube amp kit ?
  112. 300B odd behaviour
  113. Aikido starter help requested
  114. 10Y FILAMENT VOLTAGE MARGIN
  115. Wiring a multitap transformer. Help needed
  116. A directly heated pentode folded cascode
  117. Zener Power Supply Clamp
  118. SPICE Simulator Giving Negative Gain
  119. SE 811 amp schematic...
  120. Philco Labled 12AU7A black-plate 45' halo getter- Raytheon??
  121. My FrankenAmp
  122. Panel Meter Install
  123. New Amp With Hum...
  124. EF184-6j51p Load by CCS or Resitor
  125. Slew rate.. Something doesn't make sense to me.
  126. HK Citation V question
  127. Modifying a tube regulator
  128. 6BG6 Push Pull Parallel Amp Build
  129. adapting a FU32 Tube amp for QQE 03/20 tubes?
  130. audio innovations 500 one channel down?
  131. Questions about found Mullard xf1's
  132. SE 6BL7
  133. Sound Valves M60 schematics needed
  134. el34 class a mod advice please
  135. 12AU7 Genuine or remarked
  136. MIT, Triode amp cathode resistor load line
  137. Marry tube preamplifier with 2-Band Wien bridge equalizer
  138. Oddball tube question
  139. Guitar amp screen resistor selection
  140. 6H2n-EB Strange Codes??
  141. Triode Dick's KT88 PP Amp.
  142. Curves to EL 502 and EL 300
  143. Input level 1/2 ECC83 + EL84
  144. SMPS for valve design
  145. Cincinatti Mac Amps
  146. ss rectifier filter recommendate
  147. Determining plate current with non-standard screen grid voltages
  148. allnic hpa-5000
  149. Hodgepodge build
  150. Power Transformer weirdness/wiring problem
  151. Question trafo for Broskie Janus PSU
  152. Copland CVA-306 tube and output capacitor replacement
  153. Choice of Output Transformer
  154. Jumping in with both feet
  155. Large 9pin socket needed
  156. Line-up of old and currently produced RIAA Stages with tubes wanted (like EAR-834)
  157. Question about 6P31S
  158. 6N16B Aikido Cathode Resistors
  159. 1KV umbilical cords.... and other HV issues
  160. 300b Bewitch Amp Blows Fuses
  161. Dynaco ST-70
  162. Front-end topologies for PP
  163. tranformers
  164. How many LesBox units exist out there?
  165. Old Sylvania black-plate bent getter 12au7s
  166. Phono / pre amp section schematic suggestions
  167. 4P1L in parallel Single Ended
  168. Pair of Ampex 620 amps
  169. My SE 6S4S
  170. chinese ebay 12au7 + 6dj8 white cathode follower preamp boards?
  171. "chirp" when power up amplifier
  172. Modified Dynaco PAS Phono
  173. Filter Chokes wired for CMR
  174. Capacitors / K12G Tube Amp
  175. Sansui SM-30
  176. RCA Phono Preamplifier with 12ax7
  177. separate filament transformer for 5u4g?
  178. EL34 Triode strapped amplifier
  179. Testing emission without risk
  180. Anyone Build the Borbely 15W 6C33C SE?
  181. Cheap and upgradable preamp
  182. Source for least expensive tubes.
  183. 5 Pin Tube Socket Suggestions Please
  184. UXCV-11 plates?
  185. Top 5 Most Popular Tube Base
  186. 6C33C and Computer PSU
  187. Output transformer impedance for a 4P1L PSE
  188. Specs of old output transformer
  189. altec 1570b
  190. Mixed tube and ss stages grounding. Best practice?
  191. Any news from Tribute?
  192. What are this....a tube or lamp or etc?
  193. duff tube? Little Bear P1
  194. Opinion on amp build
  195. K12G For Mom & Dad
  196. RIAA Network Position
  197. 6k5GT - Good Tube Curves?
  198. 5902 pentode datasheet confusion
  199. Hum in one channel on Headphone Amp
  200. KT24 datasheet, help !!!
  201. Chicago Standard Transformer Company OPT's
  202. Help on repairing messed up AMC CVT3030
  203. Anyone traced triode curves for the 6CZ5?
  204. anthem pre-1
  205. split supply for tubes
  206. Rufus p. Turner AC-DC amp
  207. 1937 Philco Radio Amp - Build Thread
  208. Transformers for valve headphone amps
  209. Help with negative feedback
  210. Silicon Diode Measurement Confusion
  211. grommet against vibrations
  212. Help with a Moscode 300
  213. Help Identifying Valve Amplifier
  214. capacitors
  215. Questions about console parts salvaging
  216. Regarding EDCOR Transformer Data
  217. PYE mozart
  218. Tube swapping with my Condensor Mic
  219. found amp - identity unknown
  220. how to low the gain
  221. VTL TL-2 tube preamp
  222. Need Advice for Bi-amping
  223. Baldwin organ amp
  224. Octal Aikido with gain/buffer switch?
  225. Harman Kardon Stereo Tube Amp Oscillator Help!
  226. Electro-Harmonex 6973 Question
  227. Power and plate current in a SE amp
  228. 6883B for use as a audio output tube
  229. "Distortionless" Tube Oscillator -Cutting Edge Technology
  230. Feedback RH84 6v6
  231. copper wire from socket bolts to exhaust tip?
  232. What KT88 brands can handle high B+ triode connected?
  233. Williamson-style circuit with Schade feedback using pentode driver stage?
  234. potentiometer for blackface deluxe reverb
  235. GM70 tube copper vs graphite plate???
  236. +/-floating tube PSU for guitar ?! Schematic error ?
  237. About Dark Heater Tubes.
  238. Sylvania 5692 Black base tubes
  239. Tube Tester in Montreal
  240. tubelab.com's super tube SE
  241. Unsual use of triode?
  242. What the hell is Class A3 ?
  243. High voltage triodes (true triodes)
  244. Ceramic Filter Selection
  245. Eagle library for CMC teflon 9-pin tube socket?
  246. Power supply mosfet vs choke filter
  247. Capacitors used in Conrad Johnson PV7
  248. HH Scott 299A center out to subwoofer
  249. PP Amplifier Advice Sought: EL34/KT88 UL/Triode
  250. Search for StepUp 12V->142V @ 6mA

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