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  1. Valve upgrade T.A.C. 34MK
  2. Another KT88 SE Abdellah with bias issues
  3. Lowering plate dissipation
  4. A helping hand with a diyed 5687 pre, anyone?
  5. Curtis Mathes Royal Dane
  6. Buzzing decreasing with volume
  7. Fluro Ballast as DIY choke?
  8. 5R4GA ws 5R4WGB
  9. Vintage Webcor Reel to Reel Cap Value Replacement
  10. Coupling Capacitor question
  11. Aikido preamp: 12AU7 or 6CF7/6FQ7 ???
  12. Help needed to identify this Knight Mono Integrated Amp
  13. Winding my own OT
  14. Need a scope screenshot/photo of a Tube clipping
  15. isolating tube sockets
  16. tube cathode bias question: resistor / diode
  17. Silicon Chip mag "Currawong" amp
  18. Vibration spec of 6L6GC ?
  19. Output Transformer Question
  20. 6V6/6l6/EL34/KT66/KT77/6550/KT88 Primaries/ input/loads
  21. Question about HK Citation V schematics
  22. Multi-purpose Tube Preamp - need some help
  23. Vacuum Tube Workshop
  24. Constant Current Heater Source
  25. Tube amp channel loading
  26. Sexy Westra loudspeakers looking for a match
  27. KT90 parallel push pull design
  28. Beard P100 mk1 owners? And some questions.
  29. Hybrid OTL amplifier
  30. heater issue?
  31. negative bias supply
  32. The hardest part about a DIY tube amp is.....
  33. 6N2P-EV driving 6C33
  34. DIY THD Tube Tester / Analyzer
  35. 2.3 watt x 4 or 5 watt x2 SET amplifier using DECWARE Zkit1 and Zkit4 schematics
  36. Cathode follower topology
  37. Line level connected direct to split phase on EL34 PPP?
  38. 13E1 Stereo Single Ended Amp
  39. Apex PA94 Opamp Power Tube Driver
  40. STEM Amplifier Final Pre-Build Checkpoint
  41. thoriated tungsten triodes tetrodes pentodes
  42. BAT-VK 60 Pls help need repair ;(
  43. Switching on an old amplifier?
  44. elevated filament voltages
  45. Opinnions on Gold Lion KT77
  46. DIY Tube amplifier, Transformer question.
  47. Pro reverb AA165 circuit low output from vibrato channel
  48. EF42 for audio applications
  49. strange Tungsram tube
  50. Schematics TVA Mentmore M100 M200
  51. A Thordarson amp project
  52. Help: Tubes for my amp
  53. McIntosh mc40 power transformer
  54. Counterpoint SA-1 preamp schematics?
  55. What would a larger OPT get me?
  56. National VP-311C Tubescope help...
  57. 12AU7 - 12.6V DC heater wiring - noob
  58. I bought a box of tubes at an estate sale today
  59. Thermistors to prevent heater current inrush?
  60. can SE bass be as good as PP ?
  61. 2A3 cathode resistor/cap question
  62. class a output ct basic question
  63. Recent popularity of Leak TL-12
  64. bleeder resistor placement w/ power supply choke
  65. cd burner hum w tube stereo
  66. Clipping - Saturation or Mismatching Impedance?
  67. Transformer for K12g tube amp
  68. PowerTrannyHeatRemovalViaHeatSinkRadiatorPassive
  69. "Novel" push pull driver circuit
  70. Feedback lead/lag compensation
  71. ASC Metal Polypropylene Caps
  72. help with Signature Technology mono amp
  73. 7591
  74. EL34 integrated amp power loss
  75. Use treble or bass amp for midrange?
  76. Question about a SET 2A3/45
  77. western electric 124 amplifier
  78. el34 power loss in right channel
  79. Ei Silver Plate 12AX7 cathode color ?
  80. Does parafeed really improve sound?
  81. Can I use this choke
  82. Calculating 6922/E88CC/ECC88 cathode follower for 90V anode
  83. ST70 coupling caps eyelet location on PC-3?
  84. Some help with PCL86 Headphone amp Project
  85. Top (sound) quality valve phono stage
  86. Calculating cathode follower using 12AU7 for 90V supply
  87. Cathode resistor
  88. Help with an old Capitol
  89. Cathode bypass cap
  90. balanced post-OT line output?
  91. Blown SE mono, troubleshoot
  92. What is this circuit for?
  93. Siemens EL 86 NOS?
  94. Valve Operational Amplifiers
  95. What will be the best drive to 211 tube?
  96. Dual 845 SE A2 questions
  97. Harman Kardon Citation I, II, & III (Special thanks to Jim McShane and Eli Duttman!)
  98. Heater rewiring from 6N2 to 12AX7 with 6.3VAC
  99. heater bias value
  100. the hum or is it a siliconray kit
  101. DC Automatic Bias Control - Auto fixed bias
  102. What makes an OT a good OT for audiophile and need suggestion.
  103. The totally capless DHT SET amp - 300B or others
  104. Angled Socket brackets?
  105. Octal or loctal tubes as cathode follower?
  106. Used int amp please help to figured out?
  107. Rod Coleman heat sink question
  108. Tubelab SE + Fostex fe206en vs room size! suggestions needed please!
  109. ef86 pentode/triode switch: voltage rating?
  110. Input to pre-amp
  111. EML 300B
  112. Need suggestion in building a stereo power amp
  113. VALVO EL84 and ECC83 TELEFUNKEN ID?
  114. Bogen E-75 tube amp
  115. Quad II amplifier needed for parts
  116. Low voltage 6N1P RIAA?
  117. Does anybody collect vacuum tube ADV
  118. HDMI connection causes hum on Quad 303
  119. ECC81/12AT7 "sweet spot"
  120. Phono Preamp Hum
  121. Benefits of high voltage source for preamp
  122. Auto Bias
  123. Thomas Mayer Sound Processor pics
  124. Have you used the 15A6 pentode as an audio output tube ?
  125. Can I use a 5 volts tap for 6SN7 heaters?
  126. Any opinions about this tube amp kit ?
  127. 300B odd behaviour
  128. Aikido starter help requested
  129. 10Y FILAMENT VOLTAGE MARGIN
  130. Wiring a multitap transformer. Help needed
  131. A directly heated pentode folded cascode
  132. Zener Power Supply Clamp
  133. SPICE Simulator Giving Negative Gain
  134. SE 811 amp schematic...
  135. Philco Labled 12AU7A black-plate 45' halo getter- Raytheon??
  136. My FrankenAmp
  137. Panel Meter Install
  138. New Amp With Hum...
  139. EF184-6j51p Load by CCS or Resitor
  140. Slew rate.. Something doesn't make sense to me.
  141. HK Citation V question
  142. Modifying a tube regulator
  143. 6BG6 Push Pull Parallel Amp Build
  144. adapting a FU32 Tube amp for QQE 03/20 tubes?
  145. audio innovations 500 one channel down?
  146. Questions about found Mullard xf1's
  147. SE 6BL7
  148. Sound Valves M60 schematics needed
  149. el34 class a mod advice please
  150. 12AU7 Genuine or remarked
  151. MIT, Triode amp cathode resistor load line
  152. Marry tube preamplifier with 2-Band Wien bridge equalizer
  153. Oddball tube question
  154. Guitar amp screen resistor selection
  155. 6H2n-EB Strange Codes??
  156. Triode Dick's KT88 PP Amp.
  157. Curves to EL 502 and EL 300
  158. Input level 1/2 ECC83 + EL84
  159. SMPS for valve design
  160. Cincinatti Mac Amps
  161. ss rectifier filter recommendate
  162. Determining plate current with non-standard screen grid voltages
  163. allnic hpa-5000
  164. Hodgepodge build
  165. Power Transformer weirdness/wiring problem
  166. Question trafo for Broskie Janus PSU
  167. Copland CVA-306 tube and output capacitor replacement
  168. Choice of Output Transformer
  169. Jumping in with both feet
  170. Large 9pin socket needed
  171. Line-up of old and currently produced RIAA Stages with tubes wanted (like EAR-834)
  172. Question about 6P31S
  173. 6N16B Aikido Cathode Resistors
  174. 1KV umbilical cords.... and other HV issues
  175. 300b Bewitch Amp Blows Fuses
  176. Dynaco ST-70
  177. Front-end topologies for PP
  178. tranformers
  179. How many LesBox units exist out there?
  180. Old Sylvania black-plate bent getter 12au7s
  181. Phono / pre amp section schematic suggestions
  182. 4P1L in parallel Single Ended
  183. Pair of Ampex 620 amps
  184. My SE 6S4S
  185. chinese ebay 12au7 + 6dj8 white cathode follower preamp boards?
  186. "chirp" when power up amplifier
  187. Modified Dynaco PAS Phono
  188. Filter Chokes wired for CMR
  189. Capacitors / K12G Tube Amp
  190. Sansui SM-30
  191. RCA Phono Preamplifier with 12ax7
  192. separate filament transformer for 5u4g?
  193. EL34 Triode strapped amplifier
  194. Testing emission without risk
  195. Anyone Build the Borbely 15W 6C33C SE?
  196. Cheap and upgradable preamp
  197. Source for least expensive tubes.
  198. 5 Pin Tube Socket Suggestions Please
  199. UXCV-11 plates?
  200. Top 5 Most Popular Tube Base
  201. 6C33C and Computer PSU
  202. Output transformer impedance for a 4P1L PSE
  203. Specs of old output transformer
  204. altec 1570b
  205. Mixed tube and ss stages grounding. Best practice?
  206. Any news from Tribute?
  207. What are this....a tube or lamp or etc?
  208. duff tube? Little Bear P1
  209. Opinion on amp build
  210. K12G For Mom & Dad
  211. RIAA Network Position
  212. 6k5GT - Good Tube Curves?
  213. 5902 pentode datasheet confusion
  214. Hum in one channel on Headphone Amp
  215. KT24 datasheet, help !!!
  216. Chicago Standard Transformer Company OPT's
  217. Help on repairing messed up AMC CVT3030
  218. Anyone traced triode curves for the 6CZ5?
  219. anthem pre-1
  220. split supply for tubes
  221. Rufus p. Turner AC-DC amp
  222. 1937 Philco Radio Amp - Build Thread
  223. Transformers for valve headphone amps
  224. Help with negative feedback
  225. Silicon Diode Measurement Confusion
  226. grommet against vibrations
  227. Help with a Moscode 300
  228. Help Identifying Valve Amplifier
  229. capacitors
  230. Questions about console parts salvaging
  231. Regarding EDCOR Transformer Data
  232. PYE mozart
  233. Tube swapping with my Condensor Mic
  234. found amp - identity unknown
  235. how to low the gain
  236. VTL TL-2 tube preamp
  237. Need Advice for Bi-amping
  238. Baldwin organ amp
  239. Octal Aikido with gain/buffer switch?
  240. Harman Kardon Stereo Tube Amp Oscillator Help!
  241. Electro-Harmonex 6973 Question
  242. Power and plate current in a SE amp
  243. 6883B for use as a audio output tube
  244. "Distortionless" Tube Oscillator -Cutting Edge Technology
  245. Feedback RH84 6v6
  246. copper wire from socket bolts to exhaust tip?
  247. What KT88 brands can handle high B+ triode connected?
  248. Williamson-style circuit with Schade feedback using pentode driver stage?
  249. potentiometer for blackface deluxe reverb
  250. GM70 tube copper vs graphite plate???

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