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  1. Feedback lead/lag compensation
  2. ASC Metal Polypropylene Caps
  3. help with Signature Technology mono amp
  4. 7591
  5. EL34 integrated amp power loss
  6. Use treble or bass amp for midrange?
  7. Question about a SET 2A3/45
  8. western electric 124 amplifier
  9. el34 power loss in right channel
  10. Ei Silver Plate 12AX7 cathode color ?
  11. Does parafeed really improve sound?
  12. Can I use this choke
  13. Calculating 6922/E88CC/ECC88 cathode follower for 90V anode
  14. ST70 coupling caps eyelet location on PC-3?
  15. Some help with PCL86 Headphone amp Project
  16. Top (sound) quality valve phono stage
  17. Calculating cathode follower using 12AU7 for 90V supply
  18. Cathode resistor
  19. Help with an old Capitol
  20. Cathode bypass cap
  21. balanced post-OT line output?
  22. Blown SE mono, troubleshoot
  23. What is this circuit for?
  24. Siemens EL 86 NOS?
  25. Valve Operational Amplifiers
  26. What will be the best drive to 211 tube?
  27. Dual 845 SE A2 questions
  28. Harman Kardon Citation I, II, & III (Special thanks to Jim McShane and Eli Duttman!)
  29. Heater rewiring from 6N2 to 12AX7 with 6.3VAC
  30. heater bias value
  31. the hum or is it a siliconray kit
  32. DC Automatic Bias Control - Auto fixed bias
  33. What makes an OT a good OT for audiophile and need suggestion.
  34. The totally capless DHT SET amp - 300B or others
  35. Angled Socket brackets?
  36. Octal or loctal tubes as cathode follower?
  37. Used int amp please help to figured out?
  38. Rod Coleman heat sink question
  39. Tubelab SE + Fostex fe206en vs room size! suggestions needed please!
  40. ef86 pentode/triode switch: voltage rating?
  41. Input to pre-amp
  42. EML 300B
  43. Need suggestion in building a stereo power amp
  44. VALVO EL84 and ECC83 TELEFUNKEN ID?
  45. Bogen E-75 tube amp
  46. Quad II amplifier needed for parts
  47. Low voltage 6N1P RIAA?
  48. Does anybody collect vacuum tube ADV
  49. HDMI connection causes hum on Quad 303
  50. ECC81/12AT7 "sweet spot"
  51. Phono Preamp Hum
  52. Benefits of high voltage source for preamp
  53. Auto Bias
  54. Thomas Mayer Sound Processor pics
  55. Have you used the 15A6 pentode as an audio output tube ?
  56. Can I use a 5 volts tap for 6SN7 heaters?
  57. Any opinions about this tube amp kit ?
  58. 300B odd behaviour
  59. Aikido starter help requested
  60. 10Y FILAMENT VOLTAGE MARGIN
  61. Wiring a multitap transformer. Help needed
  62. A directly heated pentode folded cascode
  63. Zener Power Supply Clamp
  64. SPICE Simulator Giving Negative Gain
  65. SE 811 amp schematic...
  66. Philco Labled 12AU7A black-plate 45' halo getter- Raytheon??
  67. My FrankenAmp
  68. Panel Meter Install
  69. New Amp With Hum...
  70. EF184-6j51p Load by CCS or Resitor
  71. Slew rate.. Something doesn't make sense to me.
  72. HK Citation V question
  73. Modifying a tube regulator
  74. 6BG6 Push Pull Parallel Amp Build
  75. adapting a FU32 Tube amp for QQE 03/20 tubes?
  76. audio innovations 500 one channel down?
  77. Questions about found Mullard xf1's
  78. SE 6BL7
  79. Sound Valves M60 schematics needed
  80. el34 class a mod advice please
  81. 12AU7 Genuine or remarked
  82. MIT, Triode amp cathode resistor load line
  83. Marry tube preamplifier with 2-Band Wien bridge equalizer
  84. Oddball tube question
  85. Guitar amp screen resistor selection
  86. 6H2n-EB Strange Codes??
  87. Triode Dick's KT88 PP Amp.
  88. Curves to EL 502 and EL 300
  89. Input level 1/2 ECC83 + EL84
  90. SMPS for valve design
  91. Cincinatti Mac Amps
  92. ss rectifier filter recommendate
  93. Determining plate current with non-standard screen grid voltages
  94. allnic hpa-5000
  95. Hodgepodge build
  96. Power Transformer weirdness/wiring problem
  97. Question trafo for Broskie Janus PSU
  98. Copland CVA-306 tube and output capacitor replacement
  99. Choice of Output Transformer
  100. Jumping in with both feet
  101. Large 9pin socket needed
  102. Line-up of old and currently produced RIAA Stages with tubes wanted (like EAR-834)
  103. Question about 6P31S
  104. 6N16B Aikido Cathode Resistors
  105. 1KV umbilical cords.... and other HV issues
  106. 300b Bewitch Amp Blows Fuses
  107. Dynaco ST-70
  108. Front-end topologies for PP
  109. tranformers
  110. How many LesBox units exist out there?
  111. Old Sylvania black-plate bent getter 12au7s
  112. Phono / pre amp section schematic suggestions
  113. 4P1L in parallel Single Ended
  114. Pair of Ampex 620 amps
  115. My SE 6S4S
  116. chinese ebay 12au7 + 6dj8 white cathode follower preamp boards?
  117. "chirp" when power up amplifier
  118. Modified Dynaco PAS Phono
  119. Filter Chokes wired for CMR
  120. Capacitors / K12G Tube Amp
  121. Sansui SM-30
  122. RCA Phono Preamplifier with 12ax7
  123. separate filament transformer for 5u4g?
  124. EL34 Triode strapped amplifier
  125. Testing emission without risk
  126. Anyone Build the Borbely 15W 6C33C SE?
  127. Cheap and upgradable preamp
  128. Source for least expensive tubes.
  129. 5 Pin Tube Socket Suggestions Please
  130. UXCV-11 plates?
  131. Top 5 Most Popular Tube Base
  132. 6C33C and Computer PSU
  133. Output transformer impedance for a 4P1L PSE
  134. Specs of old output transformer
  135. altec 1570b
  136. Mixed tube and ss stages grounding. Best practice?
  137. Any news from Tribute?
  138. What are this....a tube or lamp or etc?
  139. duff tube? Little Bear P1
  140. Opinion on amp build
  141. K12G For Mom & Dad
  142. RIAA Network Position
  143. 6k5GT - Good Tube Curves?
  144. 5902 pentode datasheet confusion
  145. Hum in one channel on Headphone Amp
  146. KT24 datasheet, help !!!
  147. Chicago Standard Transformer Company OPT's
  148. Help on repairing messed up AMC CVT3030
  149. Anyone traced triode curves for the 6CZ5?
  150. anthem pre-1
  151. split supply for tubes
  152. Rufus p. Turner AC-DC amp
  153. 1937 Philco Radio Amp - Build Thread
  154. Transformers for valve headphone amps
  155. Help with negative feedback
  156. Silicon Diode Measurement Confusion
  157. grommet against vibrations
  158. Help with a Moscode 300
  159. Help Identifying Valve Amplifier
  160. capacitors
  161. Questions about console parts salvaging
  162. Regarding EDCOR Transformer Data
  163. PYE mozart
  164. Tube swapping with my Condensor Mic
  165. found amp - identity unknown
  166. how to low the gain
  167. VTL TL-2 tube preamp
  168. Need Advice for Bi-amping
  169. Baldwin organ amp
  170. Octal Aikido with gain/buffer switch?
  171. Harman Kardon Stereo Tube Amp Oscillator Help!
  172. Electro-Harmonex 6973 Question
  173. Power and plate current in a SE amp
  174. 6883B for use as a audio output tube
  175. "Distortionless" Tube Oscillator -Cutting Edge Technology
  176. Feedback RH84 6v6
  177. copper wire from socket bolts to exhaust tip?
  178. What KT88 brands can handle high B+ triode connected?
  179. Williamson-style circuit with Schade feedback using pentode driver stage?
  180. GM70 tube copper vs graphite plate???
  181. About Dark Heater Tubes.
  182. Sylvania 5692 Black base tubes
  183. Tube Tester in Montreal
  184. tubelab.com's super tube SE
  185. Unsual use of triode?
  186. What the hell is Class A3 ?
  187. High voltage triodes (true triodes)
  188. Ceramic Filter Selection
  189. Eagle library for CMC teflon 9-pin tube socket?
  190. Power supply mosfet vs choke filter
  191. Capacitors used in Conrad Johnson PV7
  192. HH Scott 299A center out to subwoofer
  193. PP Amplifier Advice Sought: EL34/KT88 UL/Triode
  194. Search for StepUp 12V->142V @ 6mA
  195. Magnavox 8802 upgrade suggestions?
  196. filament supply using two bridges
  197. 6N2P-EV gain factor ??
  198. Talking tube replacements
  199. Audi Institute VR70E amp
  200. Share Fixed Bias using Diodes
  201. Finished my Tube DI/Preamp
  202. Arcturus Blue Tubes
  203. share your experience on sound of hybrid amps
  204. ideas for a simple ECL82/86 p-p amp?
  205. Tube replacements or substitution
  206. 12ax7 / 12au7
  207. Triode/Pentode Loadline Calculator
  208. High Voltage Derived Bias Supply
  209. Universal hybrid triode-mosfet input/drive stage
  210. IT coupled 1624 or 807 amp
  211. Raytheon / Western Electric JW-5755 / 420A
  212. Calculate unknown operating point from known cathode resistor
  213. 5763 triode curves
  214. HICKOK 539a QUESTION
  215. Constant current heaters
  216. max G2 voltage 1624 tube (Tabor)
  217. Need reference for Dynaco MKIV amp build
  218. Biasing Valve on Bipolar Power Supply
  219. Tubelab sse choke input 6v6
  220. $1800 tube amp
  221. Testing a 6N3 5670 etc on a B&K 600 tester
  222. Could anyone shed any light on this amp for me?
  223. Translation Russian EL84SE design please?
  224. Determining plate and screen voltage
  225. I Don't want to set the forum on fire . . .
  226. Valab Ultra Low Noise Regulatible
  227. Westinghouse 6973 Tube
  228. Which is worth burning or keeping
  229. OPT position
  230. Remove volume pot
  231. Headphone amp ideas?
  232. Good Looking 6SN7
  233. UTC Transformer
  234. Cap substitution help
  235. Edcor replacement for w5m peerless opt
  236. Audyn True copper caps.
  237. No Feedback Balanced Line Design
  238. KT120 PP - "low power" baptized Vitruvian amplifier
  239. Senior Design Project
  240. Hovland Sapphire guidance needed
  241. Question about specialized OPT
  242. My first build tubelab SE
  243. k16ls tube amp on/off switch?
  244. SY Tube Phono Improvements?
  245. Tube newbie, anyone familar with s-5 k-502? Help needed please
  246. TVA-1 Michaelson & Austin with problems
  247. New to HIFI tube need advice
  248. Crosstalk between Triodes in Dual Triode Tubes
  249. 6L6GC instead of EL34
  250. Schade feedback and CFB

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