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  1. Output Transformer Question
  2. 6V6/6l6/EL34/KT66/KT77/6550/KT88 Primaries/ input/loads
  3. Question about HK Citation V schematics
  4. Multi-purpose Tube Preamp - need some help
  5. Vacuum Tube Workshop
  6. Constant Current Heater Source
  7. Tube amp channel loading
  8. Sexy Westra loudspeakers looking for a match
  9. KT90 parallel push pull design
  10. Beard P100 mk1 owners? And some questions.
  11. Hybrid OTL amplifier
  12. heater issue?
  13. negative bias supply
  14. The hardest part about a DIY tube amp is.....
  15. 6N2P-EV driving 6C33
  16. DIY THD Tube Tester / Analyzer
  17. 2.3 watt x 4 or 5 watt x2 SET amplifier using DECWARE Zkit1 and Zkit4 schematics
  18. Cathode follower topology
  19. Line level connected direct to split phase on EL34 PPP?
  20. 13E1 Stereo Single Ended Amp
  21. Apex PA94 Opamp Power Tube Driver
  22. STEM Amplifier Final Pre-Build Checkpoint
  23. thoriated tungsten triodes tetrodes pentodes
  24. BAT-VK 60 Pls help need repair ;(
  25. Switching on an old amplifier?
  26. elevated filament voltages
  27. Opinnions on Gold Lion KT77
  28. DIY Tube amplifier, Transformer question.
  29. Pro reverb AA165 circuit low output from vibrato channel
  30. EF42 for audio applications
  31. strange Tungsram tube
  32. Schematics TVA Mentmore M100 M200
  33. A Thordarson amp project
  34. Help: Tubes for my amp
  35. McIntosh mc40 power transformer
  36. Counterpoint SA-1 preamp schematics?
  37. What would a larger OPT get me?
  38. National VP-311C Tubescope help...
  39. 12AU7 - 12.6V DC heater wiring - noob
  40. I bought a box of tubes at an estate sale today
  41. Thermistors to prevent heater current inrush?
  42. can SE bass be as good as PP ?
  43. 2A3 cathode resistor/cap question
  44. class a output ct basic question
  45. Recent popularity of Leak TL-12
  46. bleeder resistor placement w/ power supply choke
  47. cd burner hum w tube stereo
  48. Clipping - Saturation or Mismatching Impedance?
  49. Transformer for K12g tube amp
  50. PowerTrannyHeatRemovalViaHeatSinkRadiatorPassive
  51. "Novel" push pull driver circuit
  52. Feedback lead/lag compensation
  53. ASC Metal Polypropylene Caps
  54. help with Signature Technology mono amp
  55. 7591
  56. EL34 integrated amp power loss
  57. Use treble or bass amp for midrange?
  58. Question about a SET 2A3/45
  59. western electric 124 amplifier
  60. el34 power loss in right channel
  61. Ei Silver Plate 12AX7 cathode color ?
  62. Does parafeed really improve sound?
  63. Can I use this choke
  64. Calculating 6922/E88CC/ECC88 cathode follower for 90V anode
  65. ST70 coupling caps eyelet location on PC-3?
  66. Some help with PCL86 Headphone amp Project
  67. Top (sound) quality valve phono stage
  68. Calculating cathode follower using 12AU7 for 90V supply
  69. Cathode resistor
  70. Help with an old Capitol
  71. Cathode bypass cap
  72. balanced post-OT line output?
  73. Blown SE mono, troubleshoot
  74. What is this circuit for?
  75. Siemens EL 86 NOS?
  76. Valve Operational Amplifiers
  77. What will be the best drive to 211 tube?
  78. Dual 845 SE A2 questions
  79. Harman Kardon Citation I, II, & III (Special thanks to Jim McShane and Eli Duttman!)
  80. Heater rewiring from 6N2 to 12AX7 with 6.3VAC
  81. heater bias value
  82. the hum or is it a siliconray kit
  83. DC Automatic Bias Control - Auto fixed bias
  84. What makes an OT a good OT for audiophile and need suggestion.
  85. The totally capless DHT SET amp - 300B or others
  86. Angled Socket brackets?
  87. Octal or loctal tubes as cathode follower?
  88. Used int amp please help to figured out?
  89. Rod Coleman heat sink question
  90. Tubelab SE + Fostex fe206en vs room size! suggestions needed please!
  91. ef86 pentode/triode switch: voltage rating?
  92. Input to pre-amp
  93. EML 300B
  94. Need suggestion in building a stereo power amp
  95. VALVO EL84 and ECC83 TELEFUNKEN ID?
  96. Bogen E-75 tube amp
  97. Quad II amplifier needed for parts
  98. Low voltage 6N1P RIAA?
  99. Does anybody collect vacuum tube ADV
  100. HDMI connection causes hum on Quad 303
  101. ECC81/12AT7 "sweet spot"
  102. Phono Preamp Hum
  103. Benefits of high voltage source for preamp
  104. Auto Bias
  105. Thomas Mayer Sound Processor pics
  106. Have you used the 15A6 pentode as an audio output tube ?
  107. Can I use a 5 volts tap for 6SN7 heaters?
  108. Any opinions about this tube amp kit ?
  109. 300B odd behaviour
  110. Aikido starter help requested
  111. 10Y FILAMENT VOLTAGE MARGIN
  112. Wiring a multitap transformer. Help needed
  113. A directly heated pentode folded cascode
  114. Zener Power Supply Clamp
  115. SPICE Simulator Giving Negative Gain
  116. SE 811 amp schematic...
  117. Philco Labled 12AU7A black-plate 45' halo getter- Raytheon??
  118. My FrankenAmp
  119. Panel Meter Install
  120. New Amp With Hum...
  121. EF184-6j51p Load by CCS or Resitor
  122. Slew rate.. Something doesn't make sense to me.
  123. HK Citation V question
  124. Modifying a tube regulator
  125. 6BG6 Push Pull Parallel Amp Build
  126. adapting a FU32 Tube amp for QQE 03/20 tubes?
  127. audio innovations 500 one channel down?
  128. Questions about found Mullard xf1's
  129. SE 6BL7
  130. Sound Valves M60 schematics needed
  131. el34 class a mod advice please
  132. 12AU7 Genuine or remarked
  133. MIT, Triode amp cathode resistor load line
  134. Marry tube preamplifier with 2-Band Wien bridge equalizer
  135. Oddball tube question
  136. Guitar amp screen resistor selection
  137. 6H2n-EB Strange Codes??
  138. Triode Dick's KT88 PP Amp.
  139. Curves to EL 502 and EL 300
  140. Input level 1/2 ECC83 + EL84
  141. SMPS for valve design
  142. Cincinatti Mac Amps
  143. ss rectifier filter recommendate
  144. Determining plate current with non-standard screen grid voltages
  145. allnic hpa-5000
  146. Hodgepodge build
  147. Power Transformer weirdness/wiring problem
  148. Question trafo for Broskie Janus PSU
  149. Copland CVA-306 tube and output capacitor replacement
  150. Choice of Output Transformer
  151. Jumping in with both feet
  152. Large 9pin socket needed
  153. Line-up of old and currently produced RIAA Stages with tubes wanted (like EAR-834)
  154. Question about 6P31S
  155. 6N16B Aikido Cathode Resistors
  156. 1KV umbilical cords.... and other HV issues
  157. 300b Bewitch Amp Blows Fuses
  158. Dynaco ST-70
  159. Front-end topologies for PP
  160. tranformers
  161. How many LesBox units exist out there?
  162. Old Sylvania black-plate bent getter 12au7s
  163. Phono / pre amp section schematic suggestions
  164. 4P1L in parallel Single Ended
  165. Pair of Ampex 620 amps
  166. My SE 6S4S
  167. chinese ebay 12au7 + 6dj8 white cathode follower preamp boards?
  168. "chirp" when power up amplifier
  169. Modified Dynaco PAS Phono
  170. Filter Chokes wired for CMR
  171. Capacitors / K12G Tube Amp
  172. Sansui SM-30
  173. RCA Phono Preamplifier with 12ax7
  174. separate filament transformer for 5u4g?
  175. EL34 Triode strapped amplifier
  176. Testing emission without risk
  177. Anyone Build the Borbely 15W 6C33C SE?
  178. Cheap and upgradable preamp
  179. Source for least expensive tubes.
  180. 5 Pin Tube Socket Suggestions Please
  181. UXCV-11 plates?
  182. Top 5 Most Popular Tube Base
  183. 6C33C and Computer PSU
  184. Output transformer impedance for a 4P1L PSE
  185. Specs of old output transformer
  186. altec 1570b
  187. Mixed tube and ss stages grounding. Best practice?
  188. Any news from Tribute?
  189. What are this....a tube or lamp or etc?
  190. duff tube? Little Bear P1
  191. Opinion on amp build
  192. K12G For Mom & Dad
  193. RIAA Network Position
  194. 6k5GT - Good Tube Curves?
  195. 5902 pentode datasheet confusion
  196. Hum in one channel on Headphone Amp
  197. KT24 datasheet, help !!!
  198. Chicago Standard Transformer Company OPT's
  199. Help on repairing messed up AMC CVT3030
  200. Anyone traced triode curves for the 6CZ5?
  201. anthem pre-1
  202. split supply for tubes
  203. Rufus p. Turner AC-DC amp
  204. 1937 Philco Radio Amp - Build Thread
  205. Transformers for valve headphone amps
  206. Help with negative feedback
  207. Silicon Diode Measurement Confusion
  208. grommet against vibrations
  209. Help with a Moscode 300
  210. Help Identifying Valve Amplifier
  211. capacitors
  212. Questions about console parts salvaging
  213. Regarding EDCOR Transformer Data
  214. PYE mozart
  215. Tube swapping with my Condensor Mic
  216. found amp - identity unknown
  217. how to low the gain
  218. VTL TL-2 tube preamp
  219. Need Advice for Bi-amping
  220. Baldwin organ amp
  221. Octal Aikido with gain/buffer switch?
  222. Harman Kardon Stereo Tube Amp Oscillator Help!
  223. Electro-Harmonex 6973 Question
  224. Power and plate current in a SE amp
  225. 6883B for use as a audio output tube
  226. "Distortionless" Tube Oscillator -Cutting Edge Technology
  227. Feedback RH84 6v6
  228. copper wire from socket bolts to exhaust tip?
  229. What KT88 brands can handle high B+ triode connected?
  230. Williamson-style circuit with Schade feedback using pentode driver stage?
  231. potentiometer for blackface deluxe reverb
  232. GM70 tube copper vs graphite plate???
  233. +/-floating tube PSU for guitar ?! Schematic error ?
  234. About Dark Heater Tubes.
  235. Sylvania 5692 Black base tubes
  236. Tube Tester in Montreal
  237. tubelab.com's super tube SE
  238. Unsual use of triode?
  239. What the hell is Class A3 ?
  240. High voltage triodes (true triodes)
  241. Ceramic Filter Selection
  242. Eagle library for CMC teflon 9-pin tube socket?
  243. Power supply mosfet vs choke filter
  244. Capacitors used in Conrad Johnson PV7
  245. HH Scott 299A center out to subwoofer
  246. PP Amplifier Advice Sought: EL34/KT88 UL/Triode
  247. Search for StepUp 12V->142V @ 6mA
  248. Magnavox 8802 upgrade suggestions?
  249. filament supply using two bridges
  250. 6N2P-EV gain factor ??

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