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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. 6H2n-EB Strange Codes??
  63. Triode Dick's KT88 PP Amp.
  64. Curves to EL 502 and EL 300
  65. Input level 1/2 ECC83 + EL84
  66. Cincinatti Mac Amps
  67. ss rectifier filter recommendate
  68. Determining plate current with non-standard screen grid voltages
  69. allnic hpa-5000
  70. Hodgepodge build
  71. Power Transformer weirdness/wiring problem
  72. Question trafo for Broskie Janus PSU
  73. Copland CVA-306 tube and output capacitor replacement
  74. Choice of Output Transformer
  75. Jumping in with both feet
  76. Large 9pin socket needed
  77. Line-up of old and currently produced RIAA Stages with tubes wanted (like EAR-834)
  78. Question about 6P31S
  79. 6N16B Aikido Cathode Resistors
  80. 1KV umbilical cords.... and other HV issues
  81. 300b Bewitch Amp Blows Fuses
  82. Dynaco ST-70
  83. Front-end topologies for PP
  84. tranformers
  85. How many LesBox units exist out there?
  86. Old Sylvania black-plate bent getter 12au7s
  87. Phono / pre amp section schematic suggestions
  88. 4P1L in parallel Single Ended
  89. Pair of Ampex 620 amps
  90. My SE 6S4S
  91. chinese ebay 12au7 + 6dj8 white cathode follower preamp boards?
  92. "chirp" when power up amplifier
  93. Modified Dynaco PAS Phono
  94. Filter Chokes wired for CMR
  95. Capacitors / K12G Tube Amp
  96. Sansui SM-30
  97. RCA Phono Preamplifier with 12ax7
  98. separate filament transformer for 5u4g?
  99. EL34 Triode strapped amplifier
  100. Testing emission without risk
  101. Anyone Build the Borbely 15W 6C33C SE?
  102. Cheap and upgradable preamp
  103. Source for least expensive tubes.
  104. 5 Pin Tube Socket Suggestions Please
  105. UXCV-11 plates?
  106. Top 5 Most Popular Tube Base
  107. 6C33C and Computer PSU
  108. Output transformer impedance for a 4P1L PSE
  109. Specs of old output transformer
  110. altec 1570b
  111. Mixed tube and ss stages grounding. Best practice?
  112. Any news from Tribute?
  113. What are this....a tube or lamp or etc?
  114. duff tube? Little Bear P1
  115. Opinion on amp build
  116. K12G For Mom & Dad
  117. RIAA Network Position
  118. 6k5GT - Good Tube Curves?
  119. 5902 pentode datasheet confusion
  120. Hum in one channel on Headphone Amp
  121. KT24 datasheet, help !!!
  122. Chicago Standard Transformer Company OPT's
  123. Help on repairing messed up AMC CVT3030
  124. Anyone traced triode curves for the 6CZ5?
  125. anthem pre-1
  126. split supply for tubes
  127. Rufus p. Turner AC-DC amp
  128. 1937 Philco Radio Amp - Build Thread
  129. Transformers for valve headphone amps
  130. Help with negative feedback
  131. Silicon Diode Measurement Confusion
  132. grommet against vibrations
  133. Help with a Moscode 300
  134. Help Identifying Valve Amplifier
  135. capacitors
  136. Questions about console parts salvaging
  137. Regarding EDCOR Transformer Data
  138. PYE mozart
  139. Tube swapping with my Condensor Mic
  140. found amp - identity unknown
  141. how to low the gain
  142. VTL TL-2 tube preamp
  143. Need Advice for Bi-amping
  144. Baldwin organ amp
  145. Octal Aikido with gain/buffer switch?
  146. Harman Kardon Stereo Tube Amp Oscillator Help!
  147. Electro-Harmonex 6973 Question
  148. Power and plate current in a SE amp
  149. 6883B for use as a audio output tube
  150. "Distortionless" Tube Oscillator -Cutting Edge Technology
  151. Feedback RH84 6v6
  152. copper wire from socket bolts to exhaust tip?
  153. What KT88 brands can handle high B+ triode connected?
  154. Williamson-style circuit with Schade feedback using pentode driver stage?
  155. GM70 tube copper vs graphite plate???
  156. About Dark Heater Tubes.
  157. Sylvania 5692 Black base tubes
  158. Tube Tester in Montreal
  159. Unsual use of triode?
  160. What the hell is Class A3 ?
  161. High voltage triodes (true triodes)
  162. Ceramic Filter Selection
  163. Power supply mosfet vs choke filter
  164. Capacitors used in Conrad Johnson PV7
  165. HH Scott 299A center out to subwoofer
  166. PP Amplifier Advice Sought: EL34/KT88 UL/Triode
  167. Search for StepUp 12V->142V @ 6mA
  168. Magnavox 8802 upgrade suggestions?
  169. filament supply using two bridges
  170. 6N2P-EV gain factor ??
  171. Talking tube replacements
  172. Audi Institute VR70E amp
  173. Share Fixed Bias using Diodes
  174. Arcturus Blue Tubes
  175. share your experience on sound of hybrid amps
  176. ideas for a simple ECL82/86 p-p amp?
  177. Tube replacements or substitution
  178. 12ax7 / 12au7
  179. Triode/Pentode Loadline Calculator
  180. High Voltage Derived Bias Supply
  181. Universal hybrid triode-mosfet input/drive stage
  182. IT coupled 1624 or 807 amp
  183. Raytheon / Western Electric JW-5755 / 420A
  184. Calculate unknown operating point from known cathode resistor
  185. 5763 triode curves
  186. Constant current heaters
  187. max G2 voltage 1624 tube (Tabor)
  188. Need reference for Dynaco MKIV amp build
  189. Biasing Valve on Bipolar Power Supply
  190. $1800 tube amp
  191. Testing a 6N3 5670 etc on a B&K 600 tester
  192. Could anyone shed any light on this amp for me?
  193. Translation Russian EL84SE design please?
  194. Determining plate and screen voltage
  195. I Don't want to set the forum on fire . . .
  196. Valab Ultra Low Noise Regulatible
  197. Westinghouse 6973 Tube
  198. Which is worth burning or keeping
  199. OPT position
  200. Remove volume pot
  201. Headphone amp ideas?
  202. Good Looking 6SN7
  203. UTC Transformer
  204. Cap substitution help
  205. Edcor replacement for w5m peerless opt
  206. No Feedback Balanced Line Design
  207. KT120 PP - "low power" baptized Vitruvian amplifier
  208. Hovland Sapphire guidance needed
  209. Question about specialized OPT
  210. k16ls tube amp on/off switch?
  211. SY Tube Phono Improvements?
  212. Tube newbie, anyone familar with s-5 k-502? Help needed please
  213. TVA-1 Michaelson & Austin with problems
  214. New to HIFI tube need advice
  215. Crosstalk between Triodes in Dual Triode Tubes
  216. 6L6GC instead of EL34
  217. Schade feedback and CFB
  218. Sansui AU-70 - Help Needed
  219. Pentode C.F, where to connect the suppressor grid ?
  220. Separate PSU for PP EL34 / 6SN7GT integrated amp
  221. Simple SE driver with mosfet (6sn7/307A) IRF820
  222. Is it safe to run pentode w/ no screen voltage for a min?
  223. Low B+ and CCS question
  224. Has anyone ever used slate in audio?
  225. Semi-Fixed Bias?
  226. Transformers MIC and Phono
  227. 6L6GC...More Voltage...or More Current?
  228. help me
  229. Anybody built/heard Melquiades amp
  230. Elevated grid bias
  231. Oscillation found in Luxman LX33
  232. RCA phono amp project
  233. Test of 45 Triode with EICO 625?
  234. Standard Silicon Diode Rectifier's VS Ultra Fast
  235. Output Transformer for L3 pre Audio Note
  236. "Boosted" Triode operation?
  237. 6HB6 UL push pull amp
  238. Interstage transformer ratio, spacecharge tubes in PP
  239. 6N6P line stage
  240. Revamping Tube Amp Monoblock - capacitor grounding concern
  241. 845 set bias.
  242. How to improve on a working Hybrid Amp: 832A Tube with MOSFETs
  243. tube outputs
  244. Coupling Cap Consistency
  245. Volume adjustment on 8ch at once
  246. Sub minature tube gain stage question.
  247. DHT PSE 2A3
  248. Plate voltage mic pre
  249. Estimating load for Duncan Amps PSU tool HOWTO?
  250. Shuguang Treasure Series 300B-Z not satisfactory!

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