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  1. Siemens EL 86 NOS?
  2. Valve Operational Amplifiers
  3. What will be the best drive to 211 tube?
  4. Dual 845 SE A2 questions
  5. Harman Kardon Citation I, II, & III (Special thanks to Jim McShane and Eli Duttman!)
  6. Heater rewiring from 6N2 to 12AX7 with 6.3VAC
  7. heater bias value
  8. the hum or is it a siliconray kit
  9. DC Automatic Bias Control - Auto fixed bias
  10. What makes an OT a good OT for audiophile and need suggestion.
  11. The totally capless DHT SET amp - 300B or others
  12. Angled Socket brackets?
  13. Octal or loctal tubes as cathode follower?
  14. Used int amp please help to figured out?
  15. Rod Coleman heat sink question
  16. Tubelab SE + Fostex fe206en vs room size! suggestions needed please!
  17. ef86 pentode/triode switch: voltage rating?
  18. Input to pre-amp
  19. EML 300B
  20. Need suggestion in building a stereo power amp
  21. VALVO EL84 and ECC83 TELEFUNKEN ID?
  22. Bogen E-75 tube amp
  23. Quad II amplifier needed for parts
  24. Low voltage 6N1P RIAA?
  25. Does anybody collect vacuum tube ADV
  26. HDMI connection causes hum on Quad 303
  27. ECC81/12AT7 "sweet spot"
  28. Phono Preamp Hum
  29. Benefits of high voltage source for preamp
  30. Auto Bias
  31. Thomas Mayer Sound Processor pics
  32. Have you used the 15A6 pentode as an audio output tube ?
  33. Can I use a 5 volts tap for 6SN7 heaters?
  34. Any opinions about this tube amp kit ?
  35. 300B odd behaviour
  36. Aikido starter help requested
  37. 10Y FILAMENT VOLTAGE MARGIN
  38. Wiring a multitap transformer. Help needed
  39. A directly heated pentode folded cascode
  40. Zener Power Supply Clamp
  41. SPICE Simulator Giving Negative Gain
  42. SE 811 amp schematic...
  43. Philco Labled 12AU7A black-plate 45' halo getter- Raytheon??
  44. My FrankenAmp
  45. Panel Meter Install
  46. New Amp With Hum...
  47. EF184-6j51p Load by CCS or Resitor
  48. Slew rate.. Something doesn't make sense to me.
  49. HK Citation V question
  50. Modifying a tube regulator
  51. 6BG6 Push Pull Parallel Amp Build
  52. adapting a FU32 Tube amp for QQE 03/20 tubes?
  53. audio innovations 500 one channel down?
  54. Questions about found Mullard xf1's
  55. SE 6BL7
  56. Sound Valves M60 schematics needed
  57. el34 class a mod advice please
  58. 12AU7 Genuine or remarked
  59. MIT, Triode amp cathode resistor load line
  60. Marry tube preamplifier with 2-Band Wien bridge equalizer
  61. Oddball tube question
  62. Guitar amp screen resistor selection
  63. 6H2n-EB Strange Codes??
  64. Triode Dick's KT88 PP Amp.
  65. Curves to EL 502 and EL 300
  66. Input level 1/2 ECC83 + EL84
  67. SMPS for valve design
  68. Cincinatti Mac Amps
  69. ss rectifier filter recommendate
  70. Determining plate current with non-standard screen grid voltages
  71. allnic hpa-5000
  72. Hodgepodge build
  73. Power Transformer weirdness/wiring problem
  74. Question trafo for Broskie Janus PSU
  75. Copland CVA-306 tube and output capacitor replacement
  76. Choice of Output Transformer
  77. Jumping in with both feet
  78. Large 9pin socket needed
  79. Line-up of old and currently produced RIAA Stages with tubes wanted (like EAR-834)
  80. Question about 6P31S
  81. 6N16B Aikido Cathode Resistors
  82. 1KV umbilical cords.... and other HV issues
  83. 300b Bewitch Amp Blows Fuses
  84. Dynaco ST-70
  85. Front-end topologies for PP
  86. tranformers
  87. How many LesBox units exist out there?
  88. Old Sylvania black-plate bent getter 12au7s
  89. Phono / pre amp section schematic suggestions
  90. 4P1L in parallel Single Ended
  91. Pair of Ampex 620 amps
  92. My SE 6S4S
  93. chinese ebay 12au7 + 6dj8 white cathode follower preamp boards?
  94. "chirp" when power up amplifier
  95. Modified Dynaco PAS Phono
  96. Filter Chokes wired for CMR
  97. Capacitors / K12G Tube Amp
  98. Sansui SM-30
  99. RCA Phono Preamplifier with 12ax7
  100. separate filament transformer for 5u4g?
  101. EL34 Triode strapped amplifier
  102. Testing emission without risk
  103. Anyone Build the Borbely 15W 6C33C SE?
  104. Cheap and upgradable preamp
  105. Source for least expensive tubes.
  106. 5 Pin Tube Socket Suggestions Please
  107. UXCV-11 plates?
  108. Top 5 Most Popular Tube Base
  109. 6C33C and Computer PSU
  110. Output transformer impedance for a 4P1L PSE
  111. Specs of old output transformer
  112. altec 1570b
  113. Mixed tube and ss stages grounding. Best practice?
  114. Any news from Tribute?
  115. What are this....a tube or lamp or etc?
  116. duff tube? Little Bear P1
  117. Opinion on amp build
  118. K12G For Mom & Dad
  119. RIAA Network Position
  120. 6k5GT - Good Tube Curves?
  121. 5902 pentode datasheet confusion
  122. Hum in one channel on Headphone Amp
  123. KT24 datasheet, help !!!
  124. Chicago Standard Transformer Company OPT's
  125. Help on repairing messed up AMC CVT3030
  126. Anyone traced triode curves for the 6CZ5?
  127. anthem pre-1
  128. split supply for tubes
  129. Rufus p. Turner AC-DC amp
  130. 1937 Philco Radio Amp - Build Thread
  131. Transformers for valve headphone amps
  132. Help with negative feedback
  133. Silicon Diode Measurement Confusion
  134. grommet against vibrations
  135. Help with a Moscode 300
  136. Help Identifying Valve Amplifier
  137. capacitors
  138. Questions about console parts salvaging
  139. Regarding EDCOR Transformer Data
  140. PYE mozart
  141. Tube swapping with my Condensor Mic
  142. found amp - identity unknown
  143. how to low the gain
  144. VTL TL-2 tube preamp
  145. Need Advice for Bi-amping
  146. Baldwin organ amp
  147. Octal Aikido with gain/buffer switch?
  148. Harman Kardon Stereo Tube Amp Oscillator Help!
  149. Electro-Harmonex 6973 Question
  150. Power and plate current in a SE amp
  151. 6883B for use as a audio output tube
  152. "Distortionless" Tube Oscillator -Cutting Edge Technology
  153. Feedback RH84 6v6
  154. copper wire from socket bolts to exhaust tip?
  155. What KT88 brands can handle high B+ triode connected?
  156. Williamson-style circuit with Schade feedback using pentode driver stage?
  157. potentiometer for blackface deluxe reverb
  158. GM70 tube copper vs graphite plate???
  159. +/-floating tube PSU for guitar ?! Schematic error ?
  160. About Dark Heater Tubes.
  161. Sylvania 5692 Black base tubes
  162. Tube Tester in Montreal
  163. tubelab.com's super tube SE
  164. Unsual use of triode?
  165. What the hell is Class A3 ?
  166. High voltage triodes (true triodes)
  167. Ceramic Filter Selection
  168. Eagle library for CMC teflon 9-pin tube socket?
  169. Power supply mosfet vs choke filter
  170. Capacitors used in Conrad Johnson PV7
  171. HH Scott 299A center out to subwoofer
  172. PP Amplifier Advice Sought: EL34/KT88 UL/Triode
  173. Search for StepUp 12V->142V @ 6mA
  174. Magnavox 8802 upgrade suggestions?
  175. filament supply using two bridges
  176. 6N2P-EV gain factor ??
  177. Talking tube replacements
  178. Audi Institute VR70E amp
  179. Share Fixed Bias using Diodes
  180. Finished my Tube DI/Preamp
  181. Arcturus Blue Tubes
  182. share your experience on sound of hybrid amps
  183. ideas for a simple ECL82/86 p-p amp?
  184. Tube replacements or substitution
  185. 12ax7 / 12au7
  186. Triode/Pentode Loadline Calculator
  187. Troubleshooting a Fender Champion 600
  188. High Voltage Derived Bias Supply
  189. Universal hybrid triode-mosfet input/drive stage
  190. IT coupled 1624 or 807 amp
  191. Raytheon / Western Electric JW-5755 / 420A
  192. Calculate unknown operating point from known cathode resistor
  193. 5763 triode curves
  194. HICKOK 539a QUESTION
  195. Constant current heaters
  196. max G2 voltage 1624 tube (Tabor)
  197. Need reference for Dynaco MKIV amp build
  198. Biasing Valve on Bipolar Power Supply
  199. Tubelab sse choke input 6v6
  200. $1800 tube amp
  201. Testing a 6N3 5670 etc on a B&K 600 tester
  202. Could anyone shed any light on this amp for me?
  203. Translation Russian EL84SE design please?
  204. Determining plate and screen voltage
  205. I Don't want to set the forum on fire . . .
  206. Valab Ultra Low Noise Regulatible
  207. Westinghouse 6973 Tube
  208. Which is worth burning or keeping
  209. OPT position
  210. Remove volume pot
  211. Headphone amp ideas?
  212. Good Looking 6SN7
  213. UTC Transformer
  214. Cap substitution help
  215. Edcor replacement for w5m peerless opt
  216. Audyn True copper caps.
  217. No Feedback Balanced Line Design
  218. KT120 PP - "low power" baptized Vitruvian amplifier
  219. Senior Design Project
  220. Hovland Sapphire guidance needed
  221. Question about specialized OPT
  222. My first build tubelab SE
  223. k16ls tube amp on/off switch?
  224. SY Tube Phono Improvements?
  225. Tube newbie, anyone familar with s-5 k-502? Help needed please
  226. TVA-1 Michaelson & Austin with problems
  227. New to HIFI tube need advice
  228. Crosstalk between Triodes in Dual Triode Tubes
  229. 6L6GC instead of EL34
  230. Schade feedback and CFB
  231. Sansui AU-70 - Help Needed
  232. Pentode C.F, where to connect the suppressor grid ?
  233. Separate PSU for PP EL34 / 6SN7GT integrated amp
  234. Simple SE driver with mosfet (6sn7/307A) IRF820
  235. Is it safe to run pentode w/ no screen voltage for a min?
  236. Low B+ and CCS question
  237. Has anyone ever used slate in audio?
  238. Semi-Fixed Bias?
  239. Transformers MIC and Phono
  240. Russian capacitor markings
  241. 6L6GC...More Voltage...or More Current?
  242. help me
  243. Anybody built/heard Melquiades amp
  244. Elevated grid bias
  245. Oscillation found in Luxman LX33
  246. RCA phono amp project
  247. Test of 45 Triode with EICO 625?
  248. Standard Silicon Diode Rectifier's VS Ultra Fast
  249. Output Transformer for L3 pre Audio Note
  250. "Boosted" Triode operation?

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