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  1. Anyone need a 5U4 ?
  2. Help in identify manufacturer (chicken feet?)
  3. g1 grid stoppers
  4. Lot of tubes needs a new home.....
  5. Differential Bias
  6. British Vacuum Cleaner £ Eng Co Ltd - Goblin
  7. output cap and stepped vol advice. Cary SLP50
  8. Sony TC-500 Gives Its All
  9. Another 211 monobloc
  10. 6N1P-EV Voskhod or Anod manufactured better sounding?
  11. help with long tail pair bandwidth
  12. Anyone have both an Eico HF-81 and Akai M-8?
  13. Sylvania Engineering Sample 12ax7
  14. Diy toroid transformers for 5E3 guitar amp?
  15. Between 5AR4/GZ34, 6CH3/6CJ3 and 6D22S anode resistance
  16. One-tube simple amplifier sound experiment
  17. CK1006 ignition voltage?
  18. First build- dual mono octal linestage
  19. schematic for Baldwin 3 chan organ amp
  20. output transformer inquiry.
  21. 807 triode strapped amp - few questions
  22. HV power supply with filament bias
  23. newbie with oldie! (klemt m40 valve amp)
  24. too high voltage supply HELP
  25. 6Y6G Triode Curves
  26. A Tube buffer question from a Tube newbie
  27. Marantz 7c Question - HELP !
  28. Western Electric 555 receiver (Horn Driver)
  29. Getter heater & B+ sequencing ?
  30. Tube Amplifier with 30P1S SE
  31. Little OTL / Class " A "
  32. ATC SEMITEC DIODE, CURRENT REGULATOR
  33. seperate heater transformer advice please
  34. MQ 420-SL OTs
  35. Frequency Response of Williamson Amplifier in LTspice
  36. Edcor transformer upgrade for K12G tube amp?
  37. Transformers placement under PCB
  38. OT PP Hashimoto HW-100-5 tube amp?
  39. Winding an output transformer for headphones ? Some questions
  40. Push Pull OPT Primary Impedance
  41. Tube compliment substitution question. 6gw8 to ?
  42. Watts or Db/watt ?
  43. A question about the OPT Design Assistant software and Impedance matching
  44. XF86
  45. GM70 OTL ???
  46. Output transformer impedance matching
  47. Distortion in 1 channel
  48. HV Electrolytic Caps Question
  49. need to know operating voltage for 6f6 tube amp
  50. The 2A3 build is in dream state
  51. Alembic F2B clone hum & noise
  52. Spice Question
  53. Are large SE amps like 211/845 viable!
  54. Power transformer & heater wiring questions
  55. Parallel KT88 SET Amp
  56. Why people keep talking about using pentodes in triode mode for power amp?
  57. Mono series attenuators vs. PEC for balance control?
  58. TubeTech e813cc Pair for sale on eBay.
  59. Help with new pp kt77
  60. Is 5 Watts enough?
  61. First amp advice for a Newbie
  62. Tube/valve stuff in Tokyo
  63. Advice for a neophyte
  64. EML300B reliability
  65. User's Manual Golden Tube SEP1
  66. DIY to compete with commercial
  67. Ferrite Core vs. Laminations for 2 watt OPT
  68. generating burst waveform in OrCAD® Capture program
  69. O.T. with Litz wire
  70. Valve upgrade T.A.C. 34MK
  71. Another KT88 SE Abdellah with bias issues
  72. Lowering plate dissipation
  73. A helping hand with a diyed 5687 pre, anyone?
  74. Curtis Mathes Royal Dane
  75. Buzzing decreasing with volume
  76. Fluro Ballast as DIY choke?
  77. 5R4GA ws 5R4WGB
  78. Vintage Webcor Reel to Reel Cap Value Replacement
  79. Coupling Capacitor question
  80. Aikido preamp: 12AU7 or 6CF7/6FQ7 ???
  81. Help needed to identify this Knight Mono Integrated Amp
  82. Winding my own OT
  83. Need a scope screenshot/photo of a Tube clipping
  84. isolating tube sockets
  85. tube cathode bias question: resistor / diode
  86. Silicon Chip mag "Currawong" amp
  87. Vibration spec of 6L6GC ?
  88. Output Transformer Question
  89. 6V6/6l6/EL34/KT66/KT77/6550/KT88 Primaries/ input/loads
  90. Question about HK Citation V schematics
  91. Multi-purpose Tube Preamp - need some help
  92. Vacuum Tube Workshop
  93. Constant Current Heater Source
  94. Tube amp channel loading
  95. Sexy Westra loudspeakers looking for a match
  96. KT90 parallel push pull design
  97. Beard P100 mk1 owners? And some questions.
  98. Hybrid OTL amplifier
  99. heater issue?
  100. negative bias supply
  101. The hardest part about a DIY tube amp is.....
  102. 6N2P-EV driving 6C33
  103. DIY THD Tube Tester / Analyzer
  104. 2.3 watt x 4 or 5 watt x2 SET amplifier using DECWARE Zkit1 and Zkit4 schematics
  105. Cathode follower topology
  106. Line level connected direct to split phase on EL34 PPP?
  107. 13E1 Stereo Single Ended Amp
  108. Apex PA94 Opamp Power Tube Driver
  109. STEM Amplifier Final Pre-Build Checkpoint
  110. thoriated tungsten triodes tetrodes pentodes
  111. BAT-VK 60 Pls help need repair ;(
  112. Switching on an old amplifier?
  113. elevated filament voltages
  114. Opinnions on Gold Lion KT77
  115. DIY Tube amplifier, Transformer question.
  116. Pro reverb AA165 circuit low output from vibrato channel
  117. EF42 for audio applications
  118. strange Tungsram tube
  119. Schematics TVA Mentmore M100 M200
  120. A Thordarson amp project
  121. Help: Tubes for my amp
  122. McIntosh mc40 power transformer
  123. Counterpoint SA-1 preamp schematics?
  124. What would a larger OPT get me?
  125. National VP-311C Tubescope help...
  126. 12AU7 - 12.6V DC heater wiring - noob
  127. I bought a box of tubes at an estate sale today
  128. Thermistors to prevent heater current inrush?
  129. can SE bass be as good as PP ?
  130. 2A3 cathode resistor/cap question
  131. class a output ct basic question
  132. Recent popularity of Leak TL-12
  133. bleeder resistor placement w/ power supply choke
  134. cd burner hum w tube stereo
  135. Clipping - Saturation or Mismatching Impedance?
  136. Transformer for K12g tube amp
  137. PowerTrannyHeatRemovalViaHeatSinkRadiatorPassive
  138. "Novel" push pull driver circuit
  139. Feedback lead/lag compensation
  140. ASC Metal Polypropylene Caps
  141. help with Signature Technology mono amp
  142. 7591
  143. EL34 integrated amp power loss
  144. Use treble or bass amp for midrange?
  145. Question about a SET 2A3/45
  146. western electric 124 amplifier
  147. el34 power loss in right channel
  148. Ei Silver Plate 12AX7 cathode color ?
  149. Does parafeed really improve sound?
  150. Can I use this choke
  151. Calculating 6922/E88CC/ECC88 cathode follower for 90V anode
  152. ST70 coupling caps eyelet location on PC-3?
  153. Some help with PCL86 Headphone amp Project
  154. Top (sound) quality valve phono stage
  155. Calculating cathode follower using 12AU7 for 90V supply
  156. Cathode resistor
  157. Help with an old Capitol
  158. Cathode bypass cap
  159. balanced post-OT line output?
  160. Blown SE mono, troubleshoot
  161. What is this circuit for?
  162. Siemens EL 86 NOS?
  163. Valve Operational Amplifiers
  164. What will be the best drive to 211 tube?
  165. Dual 845 SE A2 questions
  166. Harman Kardon Citation I, II, & III (Special thanks to Jim McShane and Eli Duttman!)
  167. Heater rewiring from 6N2 to 12AX7 with 6.3VAC
  168. heater bias value
  169. the hum or is it a siliconray kit
  170. DC Automatic Bias Control - Auto fixed bias
  171. What makes an OT a good OT for audiophile and need suggestion.
  172. The totally capless DHT SET amp - 300B or others
  173. Angled Socket brackets?
  174. Octal or loctal tubes as cathode follower?
  175. Used int amp please help to figured out?
  176. Rod Coleman heat sink question
  177. Tubelab SE + Fostex fe206en vs room size! suggestions needed please!
  178. ef86 pentode/triode switch: voltage rating?
  179. Input to pre-amp
  180. EML 300B
  181. Need suggestion in building a stereo power amp
  182. VALVO EL84 and ECC83 TELEFUNKEN ID?
  183. Bogen E-75 tube amp
  184. Quad II amplifier needed for parts
  185. Low voltage 6N1P RIAA?
  186. Does anybody collect vacuum tube ADV
  187. HDMI connection causes hum on Quad 303
  188. ECC81/12AT7 "sweet spot"
  189. Phono Preamp Hum
  190. Benefits of high voltage source for preamp
  191. Auto Bias
  192. Thomas Mayer Sound Processor pics
  193. Have you used the 15A6 pentode as an audio output tube ?
  194. Can I use a 5 volts tap for 6SN7 heaters?
  195. Any opinions about this tube amp kit ?
  196. 300B odd behaviour
  197. Aikido starter help requested
  198. 10Y FILAMENT VOLTAGE MARGIN
  199. Wiring a multitap transformer. Help needed
  200. A directly heated pentode folded cascode
  201. Zener Power Supply Clamp
  202. SPICE Simulator Giving Negative Gain
  203. SE 811 amp schematic...
  204. Philco Labled 12AU7A black-plate 45' halo getter- Raytheon??
  205. My FrankenAmp
  206. Panel Meter Install
  207. New Amp With Hum...
  208. EF184-6j51p Load by CCS or Resitor
  209. Slew rate.. Something doesn't make sense to me.
  210. HK Citation V question
  211. Modifying a tube regulator
  212. 6BG6 Push Pull Parallel Amp Build
  213. adapting a FU32 Tube amp for QQE 03/20 tubes?
  214. audio innovations 500 one channel down?
  215. Questions about found Mullard xf1's
  216. SE 6BL7
  217. Sound Valves M60 schematics needed
  218. el34 class a mod advice please
  219. 12AU7 Genuine or remarked
  220. MIT, Triode amp cathode resistor load line
  221. Marry tube preamplifier with 2-Band Wien bridge equalizer
  222. Oddball tube question
  223. Guitar amp screen resistor selection
  224. 6H2n-EB Strange Codes??
  225. Triode Dick's KT88 PP Amp.
  226. Curves to EL 502 and EL 300
  227. Input level 1/2 ECC83 + EL84
  228. SMPS for valve design
  229. Cincinatti Mac Amps
  230. ss rectifier filter recommendate
  231. Determining plate current with non-standard screen grid voltages
  232. allnic hpa-5000
  233. Hodgepodge build
  234. Power Transformer weirdness/wiring problem
  235. Question trafo for Broskie Janus PSU
  236. Copland CVA-306 tube and output capacitor replacement
  237. Choice of Output Transformer
  238. Jumping in with both feet
  239. Large 9pin socket needed
  240. Line-up of old and currently produced RIAA Stages with tubes wanted (like EAR-834)
  241. Question about 6P31S
  242. 6N16B Aikido Cathode Resistors
  243. 1KV umbilical cords.... and other HV issues
  244. 300b Bewitch Amp Blows Fuses
  245. Dynaco ST-70
  246. Front-end topologies for PP
  247. tranformers
  248. How many LesBox units exist out there?
  249. Old Sylvania black-plate bent getter 12au7s
  250. Phono / pre amp section schematic suggestions

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