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  1. elevated filament voltages
  2. Opinnions on Gold Lion KT77
  3. DIY Tube amplifier, Transformer question.
  4. Pro reverb AA165 circuit low output from vibrato channel
  5. EF42 for audio applications
  6. strange Tungsram tube
  7. Schematics TVA Mentmore M100 M200
  8. A Thordarson amp project
  9. Help: Tubes for my amp
  10. McIntosh mc40 power transformer
  11. Counterpoint SA-1 preamp schematics?
  12. What would a larger OPT get me?
  13. National VP-311C Tubescope help...
  14. 12AU7 - 12.6V DC heater wiring - noob
  15. I bought a box of tubes at an estate sale today
  16. Thermistors to prevent heater current inrush?
  17. can SE bass be as good as PP ?
  18. 2A3 cathode resistor/cap question
  19. class a output ct basic question
  20. Recent popularity of Leak TL-12
  21. bleeder resistor placement w/ power supply choke
  22. cd burner hum w tube stereo
  23. Clipping - Saturation or Mismatching Impedance?
  24. Transformer for K12g tube amp
  25. PowerTrannyHeatRemovalViaHeatSinkRadiatorPassive
  26. "Novel" push pull driver circuit
  27. Feedback lead/lag compensation
  28. ASC Metal Polypropylene Caps
  29. help with Signature Technology mono amp
  30. 7591
  31. EL34 integrated amp power loss
  32. Use treble or bass amp for midrange?
  33. Question about a SET 2A3/45
  34. western electric 124 amplifier
  35. el34 power loss in right channel
  36. Ei Silver Plate 12AX7 cathode color ?
  37. Does parafeed really improve sound?
  38. Can I use this choke
  39. Calculating 6922/E88CC/ECC88 cathode follower for 90V anode
  40. ST70 coupling caps eyelet location on PC-3?
  41. Some help with PCL86 Headphone amp Project
  42. Top (sound) quality valve phono stage
  43. Calculating cathode follower using 12AU7 for 90V supply
  44. Cathode resistor
  45. Help with an old Capitol
  46. Cathode bypass cap
  47. balanced post-OT line output?
  48. Blown SE mono, troubleshoot
  49. What is this circuit for?
  50. Siemens EL 86 NOS?
  51. Valve Operational Amplifiers
  52. What will be the best drive to 211 tube?
  53. Dual 845 SE A2 questions
  54. Harman Kardon Citation I, II, & III (Special thanks to Jim McShane and Eli Duttman!)
  55. Heater rewiring from 6N2 to 12AX7 with 6.3VAC
  56. heater bias value
  57. the hum or is it a siliconray kit
  58. DC Automatic Bias Control - Auto fixed bias
  59. What makes an OT a good OT for audiophile and need suggestion.
  60. The totally capless DHT SET amp - 300B or others
  61. Angled Socket brackets?
  62. Octal or loctal tubes as cathode follower?
  63. Used int amp please help to figured out?
  64. Rod Coleman heat sink question
  65. Tubelab SE + Fostex fe206en vs room size! suggestions needed please!
  66. ef86 pentode/triode switch: voltage rating?
  67. Input to pre-amp
  68. EML 300B
  69. Need suggestion in building a stereo power amp
  70. VALVO EL84 and ECC83 TELEFUNKEN ID?
  71. Bogen E-75 tube amp
  72. Quad II amplifier needed for parts
  73. Low voltage 6N1P RIAA?
  74. Does anybody collect vacuum tube ADV
  75. HDMI connection causes hum on Quad 303
  76. ECC81/12AT7 "sweet spot"
  77. Phono Preamp Hum
  78. Benefits of high voltage source for preamp
  79. Auto Bias
  80. Thomas Mayer Sound Processor pics
  81. Have you used the 15A6 pentode as an audio output tube ?
  82. Can I use a 5 volts tap for 6SN7 heaters?
  83. Any opinions about this tube amp kit ?
  84. 300B odd behaviour
  85. Aikido starter help requested
  86. 10Y FILAMENT VOLTAGE MARGIN
  87. Wiring a multitap transformer. Help needed
  88. A directly heated pentode folded cascode
  89. Zener Power Supply Clamp
  90. SPICE Simulator Giving Negative Gain
  91. SE 811 amp schematic...
  92. Philco Labled 12AU7A black-plate 45' halo getter- Raytheon??
  93. My FrankenAmp
  94. Panel Meter Install
  95. New Amp With Hum...
  96. EF184-6j51p Load by CCS or Resitor
  97. Slew rate.. Something doesn't make sense to me.
  98. HK Citation V question
  99. Modifying a tube regulator
  100. 6BG6 Push Pull Parallel Amp Build
  101. adapting a FU32 Tube amp for QQE 03/20 tubes?
  102. audio innovations 500 one channel down?
  103. Questions about found Mullard xf1's
  104. SE 6BL7
  105. Sound Valves M60 schematics needed
  106. el34 class a mod advice please
  107. 12AU7 Genuine or remarked
  108. MIT, Triode amp cathode resistor load line
  109. Marry tube preamplifier with 2-Band Wien bridge equalizer
  110. Oddball tube question
  111. Guitar amp screen resistor selection
  112. 6H2n-EB Strange Codes??
  113. Triode Dick's KT88 PP Amp.
  114. Curves to EL 502 and EL 300
  115. Input level 1/2 ECC83 + EL84
  116. SMPS for valve design
  117. Cincinatti Mac Amps
  118. ss rectifier filter recommendate
  119. Determining plate current with non-standard screen grid voltages
  120. allnic hpa-5000
  121. Hodgepodge build
  122. Power Transformer weirdness/wiring problem
  123. Question trafo for Broskie Janus PSU
  124. Copland CVA-306 tube and output capacitor replacement
  125. Choice of Output Transformer
  126. Jumping in with both feet
  127. Large 9pin socket needed
  128. Line-up of old and currently produced RIAA Stages with tubes wanted (like EAR-834)
  129. Question about 6P31S
  130. 6N16B Aikido Cathode Resistors
  131. 1KV umbilical cords.... and other HV issues
  132. 300b Bewitch Amp Blows Fuses
  133. Dynaco ST-70
  134. Front-end topologies for PP
  135. tranformers
  136. How many LesBox units exist out there?
  137. Old Sylvania black-plate bent getter 12au7s
  138. Phono / pre amp section schematic suggestions
  139. 4P1L in parallel Single Ended
  140. Pair of Ampex 620 amps
  141. My SE 6S4S
  142. chinese ebay 12au7 + 6dj8 white cathode follower preamp boards?
  143. "chirp" when power up amplifier
  144. Modified Dynaco PAS Phono
  145. Filter Chokes wired for CMR
  146. Capacitors / K12G Tube Amp
  147. Sansui SM-30
  148. RCA Phono Preamplifier with 12ax7
  149. separate filament transformer for 5u4g?
  150. EL34 Triode strapped amplifier
  151. Testing emission without risk
  152. Anyone Build the Borbely 15W 6C33C SE?
  153. Cheap and upgradable preamp
  154. Source for least expensive tubes.
  155. 5 Pin Tube Socket Suggestions Please
  156. UXCV-11 plates?
  157. Top 5 Most Popular Tube Base
  158. 6C33C and Computer PSU
  159. Output transformer impedance for a 4P1L PSE
  160. Specs of old output transformer
  161. altec 1570b
  162. Mixed tube and ss stages grounding. Best practice?
  163. Any news from Tribute?
  164. What are this....a tube or lamp or etc?
  165. duff tube? Little Bear P1
  166. Opinion on amp build
  167. K12G For Mom & Dad
  168. RIAA Network Position
  169. 6k5GT - Good Tube Curves?
  170. 5902 pentode datasheet confusion
  171. Hum in one channel on Headphone Amp
  172. KT24 datasheet, help !!!
  173. Chicago Standard Transformer Company OPT's
  174. Help on repairing messed up AMC CVT3030
  175. Anyone traced triode curves for the 6CZ5?
  176. anthem pre-1
  177. split supply for tubes
  178. Rufus p. Turner AC-DC amp
  179. 1937 Philco Radio Amp - Build Thread
  180. Transformers for valve headphone amps
  181. Help with negative feedback
  182. Silicon Diode Measurement Confusion
  183. grommet against vibrations
  184. Help with a Moscode 300
  185. Help Identifying Valve Amplifier
  186. capacitors
  187. Questions about console parts salvaging
  188. Regarding EDCOR Transformer Data
  189. PYE mozart
  190. Tube swapping with my Condensor Mic
  191. found amp - identity unknown
  192. how to low the gain
  193. VTL TL-2 tube preamp
  194. Need Advice for Bi-amping
  195. Baldwin organ amp
  196. Octal Aikido with gain/buffer switch?
  197. Harman Kardon Stereo Tube Amp Oscillator Help!
  198. Electro-Harmonex 6973 Question
  199. Power and plate current in a SE amp
  200. 6883B for use as a audio output tube
  201. "Distortionless" Tube Oscillator -Cutting Edge Technology
  202. Feedback RH84 6v6
  203. copper wire from socket bolts to exhaust tip?
  204. What KT88 brands can handle high B+ triode connected?
  205. Williamson-style circuit with Schade feedback using pentode driver stage?
  206. potentiometer for blackface deluxe reverb
  207. GM70 tube copper vs graphite plate???
  208. +/-floating tube PSU for guitar ?! Schematic error ?
  209. About Dark Heater Tubes.
  210. Sylvania 5692 Black base tubes
  211. Tube Tester in Montreal
  212. tubelab.com's super tube SE
  213. Unsual use of triode?
  214. What the hell is Class A3 ?
  215. High voltage triodes (true triodes)
  216. Ceramic Filter Selection
  217. Eagle library for CMC teflon 9-pin tube socket?
  218. Power supply mosfet vs choke filter
  219. Capacitors used in Conrad Johnson PV7
  220. HH Scott 299A center out to subwoofer
  221. PP Amplifier Advice Sought: EL34/KT88 UL/Triode
  222. Search for StepUp 12V->142V @ 6mA
  223. Magnavox 8802 upgrade suggestions?
  224. filament supply using two bridges
  225. 6N2P-EV gain factor ??
  226. Talking tube replacements
  227. Audi Institute VR70E amp
  228. Share Fixed Bias using Diodes
  229. Finished my Tube DI/Preamp
  230. Arcturus Blue Tubes
  231. share your experience on sound of hybrid amps
  232. ideas for a simple ECL82/86 p-p amp?
  233. Tube replacements or substitution
  234. 12ax7 / 12au7
  235. Triode/Pentode Loadline Calculator
  236. Troubleshooting a Fender Champion 600
  237. High Voltage Derived Bias Supply
  238. Universal hybrid triode-mosfet input/drive stage
  239. IT coupled 1624 or 807 amp
  240. Raytheon / Western Electric JW-5755 / 420A
  241. Calculate unknown operating point from known cathode resistor
  242. 5763 triode curves
  243. HICKOK 539a QUESTION
  244. Constant current heaters
  245. max G2 voltage 1624 tube (Tabor)
  246. Need reference for Dynaco MKIV amp build
  247. Biasing Valve on Bipolar Power Supply
  248. Tubelab sse choke input 6v6
  249. $1800 tube amp
  250. Testing a 6N3 5670 etc on a B&K 600 tester

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