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  1. el34 power loss in right channel
  2. Ei Silver Plate 12AX7 cathode color ?
  3. Does parafeed really improve sound?
  4. Can I use this choke
  5. Calculating 6922/E88CC/ECC88 cathode follower for 90V anode
  6. ST70 coupling caps eyelet location on PC-3?
  7. Some help with PCL86 Headphone amp Project
  8. Top (sound) quality valve phono stage
  9. Calculating cathode follower using 12AU7 for 90V supply
  10. Cathode resistor
  11. Help with an old Capitol
  12. Cathode bypass cap
  13. balanced post-OT line output?
  14. Blown SE mono, troubleshoot
  15. What is this circuit for?
  16. Siemens EL 86 NOS?
  17. Valve Operational Amplifiers
  18. What will be the best drive to 211 tube?
  19. Dual 845 SE A2 questions
  20. Harman Kardon Citation I, II, & III (Special thanks to Jim McShane and Eli Duttman!)
  21. Heater rewiring from 6N2 to 12AX7 with 6.3VAC
  22. heater bias value
  23. the hum or is it a siliconray kit
  24. DC Automatic Bias Control - Auto fixed bias
  25. What makes an OT a good OT for audiophile and need suggestion.
  26. The totally capless DHT SET amp - 300B or others
  27. Angled Socket brackets?
  28. Octal or loctal tubes as cathode follower?
  29. Used int amp please help to figured out?
  30. Rod Coleman heat sink question
  31. Tubelab SE + Fostex fe206en vs room size! suggestions needed please!
  32. ef86 pentode/triode switch: voltage rating?
  33. Input to pre-amp
  34. EML 300B
  35. Need suggestion in building a stereo power amp
  36. VALVO EL84 and ECC83 TELEFUNKEN ID?
  37. Bogen E-75 tube amp
  38. Quad II amplifier needed for parts
  39. Low voltage 6N1P RIAA?
  40. Does anybody collect vacuum tube ADV
  41. HDMI connection causes hum on Quad 303
  42. ECC81/12AT7 "sweet spot"
  43. Phono Preamp Hum
  44. Benefits of high voltage source for preamp
  45. Auto Bias
  46. Thomas Mayer Sound Processor pics
  47. Have you used the 15A6 pentode as an audio output tube ?
  48. Can I use a 5 volts tap for 6SN7 heaters?
  49. Any opinions about this tube amp kit ?
  50. 300B odd behaviour
  51. Aikido starter help requested
  52. 10Y FILAMENT VOLTAGE MARGIN
  53. Wiring a multitap transformer. Help needed
  54. A directly heated pentode folded cascode
  55. Zener Power Supply Clamp
  56. SPICE Simulator Giving Negative Gain
  57. SE 811 amp schematic...
  58. Philco Labled 12AU7A black-plate 45' halo getter- Raytheon??
  59. My FrankenAmp
  60. Panel Meter Install
  61. New Amp With Hum...
  62. EF184-6j51p Load by CCS or Resitor
  63. Slew rate.. Something doesn't make sense to me.
  64. HK Citation V question
  65. Modifying a tube regulator
  66. 6BG6 Push Pull Parallel Amp Build
  67. adapting a FU32 Tube amp for QQE 03/20 tubes?
  68. audio innovations 500 one channel down?
  69. Questions about found Mullard xf1's
  70. SE 6BL7
  71. Sound Valves M60 schematics needed
  72. el34 class a mod advice please
  73. 12AU7 Genuine or remarked
  74. MIT, Triode amp cathode resistor load line
  75. Marry tube preamplifier with 2-Band Wien bridge equalizer
  76. Oddball tube question
  77. Guitar amp screen resistor selection
  78. 6H2n-EB Strange Codes??
  79. Triode Dick's KT88 PP Amp.
  80. Curves to EL 502 and EL 300
  81. Input level 1/2 ECC83 + EL84
  82. SMPS for valve design
  83. Cincinatti Mac Amps
  84. ss rectifier filter recommendate
  85. Determining plate current with non-standard screen grid voltages
  86. allnic hpa-5000
  87. Hodgepodge build
  88. Power Transformer weirdness/wiring problem
  89. Question trafo for Broskie Janus PSU
  90. Copland CVA-306 tube and output capacitor replacement
  91. Choice of Output Transformer
  92. Jumping in with both feet
  93. Large 9pin socket needed
  94. Line-up of old and currently produced RIAA Stages with tubes wanted (like EAR-834)
  95. Question about 6P31S
  96. 6N16B Aikido Cathode Resistors
  97. 1KV umbilical cords.... and other HV issues
  98. 300b Bewitch Amp Blows Fuses
  99. Dynaco ST-70
  100. Front-end topologies for PP
  101. tranformers
  102. How many LesBox units exist out there?
  103. Old Sylvania black-plate bent getter 12au7s
  104. Phono / pre amp section schematic suggestions
  105. 4P1L in parallel Single Ended
  106. Pair of Ampex 620 amps
  107. My SE 6S4S
  108. chinese ebay 12au7 + 6dj8 white cathode follower preamp boards?
  109. "chirp" when power up amplifier
  110. Modified Dynaco PAS Phono
  111. Filter Chokes wired for CMR
  112. Capacitors / K12G Tube Amp
  113. Sansui SM-30
  114. RCA Phono Preamplifier with 12ax7
  115. separate filament transformer for 5u4g?
  116. EL34 Triode strapped amplifier
  117. Testing emission without risk
  118. Anyone Build the Borbely 15W 6C33C SE?
  119. Cheap and upgradable preamp
  120. Source for least expensive tubes.
  121. 5 Pin Tube Socket Suggestions Please
  122. UXCV-11 plates?
  123. Top 5 Most Popular Tube Base
  124. 6C33C and Computer PSU
  125. Output transformer impedance for a 4P1L PSE
  126. Specs of old output transformer
  127. altec 1570b
  128. Mixed tube and ss stages grounding. Best practice?
  129. Any news from Tribute?
  130. What are this....a tube or lamp or etc?
  131. duff tube? Little Bear P1
  132. Opinion on amp build
  133. K12G For Mom & Dad
  134. RIAA Network Position
  135. 6k5GT - Good Tube Curves?
  136. 5902 pentode datasheet confusion
  137. Hum in one channel on Headphone Amp
  138. KT24 datasheet, help !!!
  139. Chicago Standard Transformer Company OPT's
  140. Help on repairing messed up AMC CVT3030
  141. Anyone traced triode curves for the 6CZ5?
  142. anthem pre-1
  143. split supply for tubes
  144. Rufus p. Turner AC-DC amp
  145. 1937 Philco Radio Amp - Build Thread
  146. Transformers for valve headphone amps
  147. Help with negative feedback
  148. Silicon Diode Measurement Confusion
  149. grommet against vibrations
  150. Help with a Moscode 300
  151. Help Identifying Valve Amplifier
  152. capacitors
  153. Questions about console parts salvaging
  154. Regarding EDCOR Transformer Data
  155. PYE mozart
  156. Tube swapping with my Condensor Mic
  157. found amp - identity unknown
  158. how to low the gain
  159. VTL TL-2 tube preamp
  160. Need Advice for Bi-amping
  161. Baldwin organ amp
  162. Octal Aikido with gain/buffer switch?
  163. Harman Kardon Stereo Tube Amp Oscillator Help!
  164. Electro-Harmonex 6973 Question
  165. Power and plate current in a SE amp
  166. 6883B for use as a audio output tube
  167. "Distortionless" Tube Oscillator -Cutting Edge Technology
  168. Feedback RH84 6v6
  169. copper wire from socket bolts to exhaust tip?
  170. What KT88 brands can handle high B+ triode connected?
  171. Williamson-style circuit with Schade feedback using pentode driver stage?
  172. potentiometer for blackface deluxe reverb
  173. GM70 tube copper vs graphite plate???
  174. +/-floating tube PSU for guitar ?! Schematic error ?
  175. About Dark Heater Tubes.
  176. Sylvania 5692 Black base tubes
  177. Tube Tester in Montreal
  178. tubelab.com's super tube SE
  179. Unsual use of triode?
  180. What the hell is Class A3 ?
  181. High voltage triodes (true triodes)
  182. Ceramic Filter Selection
  183. Eagle library for CMC teflon 9-pin tube socket?
  184. Power supply mosfet vs choke filter
  185. Capacitors used in Conrad Johnson PV7
  186. HH Scott 299A center out to subwoofer
  187. PP Amplifier Advice Sought: EL34/KT88 UL/Triode
  188. Search for StepUp 12V->142V @ 6mA
  189. Magnavox 8802 upgrade suggestions?
  190. filament supply using two bridges
  191. 6N2P-EV gain factor ??
  192. Talking tube replacements
  193. Audi Institute VR70E amp
  194. Share Fixed Bias using Diodes
  195. Finished my Tube DI/Preamp
  196. Arcturus Blue Tubes
  197. share your experience on sound of hybrid amps
  198. ideas for a simple ECL82/86 p-p amp?
  199. Tube replacements or substitution
  200. 12ax7 / 12au7
  201. Triode/Pentode Loadline Calculator
  202. Troubleshooting a Fender Champion 600
  203. High Voltage Derived Bias Supply
  204. Universal hybrid triode-mosfet input/drive stage
  205. IT coupled 1624 or 807 amp
  206. Raytheon / Western Electric JW-5755 / 420A
  207. Calculate unknown operating point from known cathode resistor
  208. 5763 triode curves
  209. HICKOK 539a QUESTION
  210. Constant current heaters
  211. max G2 voltage 1624 tube (Tabor)
  212. Need reference for Dynaco MKIV amp build
  213. Biasing Valve on Bipolar Power Supply
  214. Tubelab sse choke input 6v6
  215. $1800 tube amp
  216. Testing a 6N3 5670 etc on a B&K 600 tester
  217. Could anyone shed any light on this amp for me?
  218. Translation Russian EL84SE design please?
  219. Determining plate and screen voltage
  220. I Don't want to set the forum on fire . . .
  221. Valab Ultra Low Noise Regulatible
  222. Westinghouse 6973 Tube
  223. Which is worth burning or keeping
  224. OPT position
  225. Remove volume pot
  226. Headphone amp ideas?
  227. Good Looking 6SN7
  228. UTC Transformer
  229. Cap substitution help
  230. Edcor replacement for w5m peerless opt
  231. Audyn True copper caps.
  232. No Feedback Balanced Line Design
  233. KT120 PP - "low power" baptized Vitruvian amplifier
  234. Senior Design Project
  235. Hovland Sapphire guidance needed
  236. Question about specialized OPT
  237. My first build tubelab SE
  238. k16ls tube amp on/off switch?
  239. SY Tube Phono Improvements?
  240. Tube newbie, anyone familar with s-5 k-502? Help needed please
  241. TVA-1 Michaelson & Austin with problems
  242. New to HIFI tube need advice
  243. Crosstalk between Triodes in Dual Triode Tubes
  244. 6L6GC instead of EL34
  245. Schade feedback and CFB
  246. Sansui AU-70 - Help Needed
  247. Pentode C.F, where to connect the suppressor grid ?
  248. Separate PSU for PP EL34 / 6SN7GT integrated amp
  249. Simple SE driver with mosfet (6sn7/307A) IRF820
  250. Is it safe to run pentode w/ no screen voltage for a min?

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