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  1. Differential Bias
  2. British Vacuum Cleaner £ Eng Co Ltd - Goblin
  3. output cap and stepped vol advice. Cary SLP50
  4. Sony TC-500 Gives Its All
  5. Another 211 monobloc
  6. 6N1P-EV Voskhod or Anod manufactured better sounding?
  7. help with long tail pair bandwidth
  8. Anyone have both an Eico HF-81 and Akai M-8?
  9. Sylvania Engineering Sample 12ax7
  10. Diy toroid transformers for 5E3 guitar amp?
  11. Between 5AR4/GZ34, 6CH3/6CJ3 and 6D22S anode resistance
  12. One-tube simple amplifier sound experiment
  13. CK1006 ignition voltage?
  14. First build- dual mono octal linestage
  15. schematic for Baldwin 3 chan organ amp
  16. output transformer inquiry.
  17. 807 triode strapped amp - few questions
  18. HV power supply with filament bias
  19. newbie with oldie! (klemt m40 valve amp)
  20. too high voltage supply HELP
  21. 6Y6G Triode Curves
  22. A Tube buffer question from a Tube newbie
  23. Marantz 7c Question - HELP !
  24. Western Electric 555 receiver (Horn Driver)
  25. Getter heater & B+ sequencing ?
  26. Tube Amplifier with 30P1S SE
  27. Little OTL / Class " A "
  28. ATC SEMITEC DIODE, CURRENT REGULATOR
  29. seperate heater transformer advice please
  30. MQ 420-SL OTs
  31. Frequency Response of Williamson Amplifier in LTspice
  32. Edcor transformer upgrade for K12G tube amp?
  33. Transformers placement under PCB
  34. OT PP Hashimoto HW-100-5 tube amp?
  35. Winding an output transformer for headphones ? Some questions
  36. Push Pull OPT Primary Impedance
  37. Tube compliment substitution question. 6gw8 to ?
  38. Watts or Db/watt ?
  39. A question about the OPT Design Assistant software and Impedance matching
  40. XF86
  41. GM70 OTL ???
  42. Output transformer impedance matching
  43. Distortion in 1 channel
  44. HV Electrolytic Caps Question
  45. need to know operating voltage for 6f6 tube amp
  46. The 2A3 build is in dream state
  47. Alembic F2B clone hum & noise
  48. Spice Question
  49. Are large SE amps like 211/845 viable!
  50. Power transformer & heater wiring questions
  51. Parallel KT88 SET Amp
  52. Why people keep talking about using pentodes in triode mode for power amp?
  53. Mono series attenuators vs. PEC for balance control?
  54. TubeTech e813cc Pair for sale on eBay.
  55. Help with new pp kt77
  56. Is 5 Watts enough?
  57. First amp advice for a Newbie
  58. Tube/valve stuff in Tokyo
  59. Advice for a neophyte
  60. EML300B reliability
  61. User's Manual Golden Tube SEP1
  62. DIY to compete with commercial
  63. Ferrite Core vs. Laminations for 2 watt OPT
  64. generating burst waveform in OrCAD® Capture program
  65. O.T. with Litz wire
  66. Valve upgrade T.A.C. 34MK
  67. Another KT88 SE Abdellah with bias issues
  68. Lowering plate dissipation
  69. A helping hand with a diyed 5687 pre, anyone?
  70. Curtis Mathes Royal Dane
  71. Buzzing decreasing with volume
  72. Fluro Ballast as DIY choke?
  73. 5R4GA ws 5R4WGB
  74. Vintage Webcor Reel to Reel Cap Value Replacement
  75. Coupling Capacitor question
  76. Aikido preamp: 12AU7 or 6CF7/6FQ7 ???
  77. Help needed to identify this Knight Mono Integrated Amp
  78. Winding my own OT
  79. Need a scope screenshot/photo of a Tube clipping
  80. isolating tube sockets
  81. tube cathode bias question: resistor / diode
  82. Silicon Chip mag "Currawong" amp
  83. Vibration spec of 6L6GC ?
  84. Output Transformer Question
  85. 6V6/6l6/EL34/KT66/KT77/6550/KT88 Primaries/ input/loads
  86. Question about HK Citation V schematics
  87. Multi-purpose Tube Preamp - need some help
  88. Vacuum Tube Workshop
  89. Constant Current Heater Source
  90. Tube amp channel loading
  91. Sexy Westra loudspeakers looking for a match
  92. KT90 parallel push pull design
  93. Beard P100 mk1 owners? And some questions.
  94. Hybrid OTL amplifier
  95. heater issue?
  96. negative bias supply
  97. The hardest part about a DIY tube amp is.....
  98. 6N2P-EV driving 6C33
  99. DIY THD Tube Tester / Analyzer
  100. 2.3 watt x 4 or 5 watt x2 SET amplifier using DECWARE Zkit1 and Zkit4 schematics
  101. Cathode follower topology
  102. Line level connected direct to split phase on EL34 PPP?
  103. 13E1 Stereo Single Ended Amp
  104. Apex PA94 Opamp Power Tube Driver
  105. STEM Amplifier Final Pre-Build Checkpoint
  106. thoriated tungsten triodes tetrodes pentodes
  107. BAT-VK 60 Pls help need repair ;(
  108. Switching on an old amplifier?
  109. elevated filament voltages
  110. Opinnions on Gold Lion KT77
  111. DIY Tube amplifier, Transformer question.
  112. Pro reverb AA165 circuit low output from vibrato channel
  113. EF42 for audio applications
  114. strange Tungsram tube
  115. Schematics TVA Mentmore M100 M200
  116. A Thordarson amp project
  117. Help: Tubes for my amp
  118. McIntosh mc40 power transformer
  119. Counterpoint SA-1 preamp schematics?
  120. What would a larger OPT get me?
  121. National VP-311C Tubescope help...
  122. 12AU7 - 12.6V DC heater wiring - noob
  123. I bought a box of tubes at an estate sale today
  124. Thermistors to prevent heater current inrush?
  125. can SE bass be as good as PP ?
  126. 2A3 cathode resistor/cap question
  127. class a output ct basic question
  128. Recent popularity of Leak TL-12
  129. bleeder resistor placement w/ power supply choke
  130. cd burner hum w tube stereo
  131. Clipping - Saturation or Mismatching Impedance?
  132. Transformer for K12g tube amp
  133. PowerTrannyHeatRemovalViaHeatSinkRadiatorPassive
  134. "Novel" push pull driver circuit
  135. Feedback lead/lag compensation
  136. ASC Metal Polypropylene Caps
  137. help with Signature Technology mono amp
  138. 7591
  139. EL34 integrated amp power loss
  140. Use treble or bass amp for midrange?
  141. Question about a SET 2A3/45
  142. western electric 124 amplifier
  143. el34 power loss in right channel
  144. Ei Silver Plate 12AX7 cathode color ?
  145. Does parafeed really improve sound?
  146. Can I use this choke
  147. Calculating 6922/E88CC/ECC88 cathode follower for 90V anode
  148. ST70 coupling caps eyelet location on PC-3?
  149. Some help with PCL86 Headphone amp Project
  150. Top (sound) quality valve phono stage
  151. Calculating cathode follower using 12AU7 for 90V supply
  152. Cathode resistor
  153. Help with an old Capitol
  154. Cathode bypass cap
  155. balanced post-OT line output?
  156. Blown SE mono, troubleshoot
  157. What is this circuit for?
  158. Siemens EL 86 NOS?
  159. Valve Operational Amplifiers
  160. What will be the best drive to 211 tube?
  161. Dual 845 SE A2 questions
  162. Harman Kardon Citation I, II, & III (Special thanks to Jim McShane and Eli Duttman!)
  163. Heater rewiring from 6N2 to 12AX7 with 6.3VAC
  164. heater bias value
  165. the hum or is it a siliconray kit
  166. DC Automatic Bias Control - Auto fixed bias
  167. What makes an OT a good OT for audiophile and need suggestion.
  168. The totally capless DHT SET amp - 300B or others
  169. Angled Socket brackets?
  170. Octal or loctal tubes as cathode follower?
  171. Used int amp please help to figured out?
  172. Rod Coleman heat sink question
  173. Tubelab SE + Fostex fe206en vs room size! suggestions needed please!
  174. ef86 pentode/triode switch: voltage rating?
  175. Input to pre-amp
  176. EML 300B
  177. Need suggestion in building a stereo power amp
  178. VALVO EL84 and ECC83 TELEFUNKEN ID?
  179. Bogen E-75 tube amp
  180. Quad II amplifier needed for parts
  181. Low voltage 6N1P RIAA?
  182. Does anybody collect vacuum tube ADV
  183. HDMI connection causes hum on Quad 303
  184. ECC81/12AT7 "sweet spot"
  185. Phono Preamp Hum
  186. Benefits of high voltage source for preamp
  187. Auto Bias
  188. Thomas Mayer Sound Processor pics
  189. Have you used the 15A6 pentode as an audio output tube ?
  190. Can I use a 5 volts tap for 6SN7 heaters?
  191. Any opinions about this tube amp kit ?
  192. 300B odd behaviour
  193. Aikido starter help requested
  194. 10Y FILAMENT VOLTAGE MARGIN
  195. Wiring a multitap transformer. Help needed
  196. A directly heated pentode folded cascode
  197. Zener Power Supply Clamp
  198. SPICE Simulator Giving Negative Gain
  199. SE 811 amp schematic...
  200. Philco Labled 12AU7A black-plate 45' halo getter- Raytheon??
  201. My FrankenAmp
  202. Panel Meter Install
  203. New Amp With Hum...
  204. EF184-6j51p Load by CCS or Resitor
  205. Slew rate.. Something doesn't make sense to me.
  206. HK Citation V question
  207. Modifying a tube regulator
  208. 6BG6 Push Pull Parallel Amp Build
  209. adapting a FU32 Tube amp for QQE 03/20 tubes?
  210. audio innovations 500 one channel down?
  211. Questions about found Mullard xf1's
  212. SE 6BL7
  213. Sound Valves M60 schematics needed
  214. el34 class a mod advice please
  215. 12AU7 Genuine or remarked
  216. MIT, Triode amp cathode resistor load line
  217. Marry tube preamplifier with 2-Band Wien bridge equalizer
  218. Oddball tube question
  219. Guitar amp screen resistor selection
  220. 6H2n-EB Strange Codes??
  221. Triode Dick's KT88 PP Amp.
  222. Curves to EL 502 and EL 300
  223. Input level 1/2 ECC83 + EL84
  224. SMPS for valve design
  225. Cincinatti Mac Amps
  226. ss rectifier filter recommendate
  227. Determining plate current with non-standard screen grid voltages
  228. allnic hpa-5000
  229. Hodgepodge build
  230. Power Transformer weirdness/wiring problem
  231. Question trafo for Broskie Janus PSU
  232. Copland CVA-306 tube and output capacitor replacement
  233. Choice of Output Transformer
  234. Jumping in with both feet
  235. Large 9pin socket needed
  236. Line-up of old and currently produced RIAA Stages with tubes wanted (like EAR-834)
  237. Question about 6P31S
  238. 6N16B Aikido Cathode Resistors
  239. 1KV umbilical cords.... and other HV issues
  240. 300b Bewitch Amp Blows Fuses
  241. Dynaco ST-70
  242. Front-end topologies for PP
  243. tranformers
  244. How many LesBox units exist out there?
  245. Old Sylvania black-plate bent getter 12au7s
  246. Phono / pre amp section schematic suggestions
  247. 4P1L in parallel Single Ended
  248. Pair of Ampex 620 amps
  249. My SE 6S4S
  250. chinese ebay 12au7 + 6dj8 white cathode follower preamp boards?

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