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  1. Which factory made these tubes ?
  2. 813 and gm70
  3. 13E1 Push Pull
  4. dump find.
  5. ...6SN7GT operating points tube help.......
  6. 6L6 6SJ7 Amp please pick faults if any
  7. Updated DIY EL34B 6SJ7 SE Amp
  8. 6C18 x 6C33
  9. Vintage tube amp find
  10. any benefit to screen-grid drive a 6V6?
  11. Brown face Scott LK72
  12. Pilot 1060 integrated - make it better!
  13. Should I ground my K12G or my Bugle 2?
  14. 6c33 amp convert to 6c41
  15. STA-LEVEL thumbs problem
  16. Amp motorboating at power up
  17. Spice models for AL4 and RS242 tubes
  18. Mains Switch
  19. Suggestions for big output stage needed
  20. Very Good (or best?) 12B4 schematic?
  21. Amplifier for active bookshelf speakers
  22. Olson AM-240 schematic needed
  23. Valve amp - maintenance
  24. Your opinion about Rotel 930AX to hyrbid mod
  25. Weston Tube Tester 774-5
  26. Tube circuit sim software for free?
  27. 6v6 family tubes
  28. Troublesome bias resistor, cathodyne stage
  29. 6AQ5 excellent for line stage?
  30. Datasheet 6P42s and 6P45C
  31. Quad / Cyrus impedance matching
  32. Zobel network at primary audio trafo?
  33. ECL86 question
  34. 500c buzzing power transformer
  35. LM4702+6L6GB/807
  36. TubeAudio Mixer Blog
  37. Finally started on my 6L6 amp. Need tube suggestions.
  38. Just another Scott thread
  39. Design for overdriven output stage
  40. Seeking Articals On Audio Transformer Design & Construction.
  41. Bias el34 pp
  42. Photo Gallery.
  43. Precision S35
  44. 6L6WGB
  45. 6BQ7A Driver
  46. Advise for Simpson 340 signal generator problem
  47. Armaco TTHF or Calrad AP 15 What to do What to do?...
  48. Screen Power and Warmup
  49. Wanting copies of Prof. Alexander Bereskin's transformer winding pictures.
  50. what's the brand of this capacitor sounds great ?
  51. Edcor CXSE25-8-3.2K or Transcendar TT-017-OT?
  52. PP 2A3 Fixed Bias
  53. RL12P35 convert to el34
  54. Statistical regulator from VA 4rd edition
  55. Matching Impedances (the Math behind it) Please Advise if you have a grasp. Xfmrs etc
  56. Help 6AQ5 pushpull
  57. HV Logic Control Approach
  58. Valve heater question
  59. Phase inverter adjustment - Fisher 80AZ
  60. Repurposing a Bogen CHB-35A
  61. SMPS
  62. Interstage and bias failure
  63. Grid 2 current for GU19-1
  64. 6x5 tube
  65. IT coupled 6BG6GA
  66. Mystery noise has got me baffled
  67. Dynaco PAS: too much liposuction?
  68. LP Tape Noise
  69. YAKOV ARONOV MA-100
  70. Help for balance-tone control-mode selector bypass
  71. Opinions please: seeking a first class DIY SET amp design
  72. PSU for 6N6P
  73. HOT B+ capacitors!
  74. Analog meter monitoring HT supply
  75. Lamm LL2.1 DC Offset problem
  76. 6L6GT/6SJ7 Valve Amp DIY
  77. BHExchange for BottleHead's
  78. 6BY5GA elevated heater question
  79. Tone controls
  80. EL84 "IP" questions
  81. KIT Single ended KT88
  82. HELP needed - LEAK Varislope 2 Stereo + Stereo 20 with pictures...
  83. All tube cap tube amp?
  84. 12AX7 preamp for DAC
  85. Grid resistors -> GND
  86. OTL headphone amp distorting & clipping: weak power supply?
  87. Broken bias resistors (Yaqin MC-10L)
  88. Tube Enclosure suggestion from Europe.
  89. Benefit/SQ of tube stage at the input of ss power amp
  90. Is 6907 and QQV03-20A tubes are same?
  91. Found some chokes
  92. 6SN7 at low plate currents
  93. 12AU7, 12BH7, Darker Less Bright Option
  94. Heater current effects
  95. Not using all the sections on multi-section cap
  96. DC heater supply dies on me
  97. 1972 Leak Varislope 2 Stereo
  98. OPT secondary ground, stacked supplies
  99. OTL for HeaPhone
  100. Voltage doubler and filament supply
  101. Please suggest me a 6V6 class AB amp
  102. Need Review of wiring up of this SRPP 6AS7 tube amp
  103. Hum in a triode 1H6G...help !
  104. 40w Class A PP KT66?
  105. My new small amp EL84 SE Triode
  106. tube preamp output impedance
  107. pete millet 807 amp
  108. Lost Negative Bias-Fixed Bias
  109. Aikido ('dead quiet') output impedance
  110. Looking for lineamp buffer schematics
  111. Nagra VPA 845
  112. How to match 6C45?
  113. Yet another question about cathode bias (led+pnp)
  114. Ideal System for 1960?
  115. What replaces an IN541 diode?
  116. Bottlehead Eros or Tube4Hifi PH16
  117. Psvane 2a3 T Mk II reliable vender
  118. Odd Wima cap markings
  119. Chinese Amp kit experience
  120. Considerations about headph. OCL
  121. Trying to solve a Plate Follower Problem
  122. Nichicon Caps
  123. Footprint Noval ECC83 Altium
  124. Interference in hybrid amp
  125. wiring DHT filaments with center tapped secondaries
  126. B+ of Curcio Daniel II
  127. Stepped Attenuators Questions
  128. Noisy Ground? (Probably not a loop)
  129. New Production Telefunken
  130. Tube horizontal mounting position
  131. "Ask Jan First" parts website in Germany
  132. EZ215 Stereo 5881 Amp Project
  133. CCS help dn2540 send 340v to the chassis
  134. That's What She Said RH84 Build Log
  135. Help figuring out this output transformer.
  136. 5881 PPP Cathode Bias B+
  137. Measuring DHT filament V with minimal effect.
  138. 100hz hum with Audio Research vs-55
  139. Volume potentiometer
  140. Driver for 2A3C
  141. Regulated B+ sounds worse?
  142. Sylvania console amp rebuild...
  143. E130L Micron
  144. Question Re: Ground Loop Breakers
  145. Source for D3A/7721?
  146. ID a salvaged choke
  147. Magnetwire gauge size converted to metric
  148. ccs what is the best way
  149. parafeed test/measurement setup question.
  150. how do balance pots work?
  151. Issue with parafeed in SPICE
  152. GU-50 Dissected
  153. Need help on ground wiring for Scott 222-B
  154. Heathkit A9-C Mod
  155. Need a 240v, 5vac - 6-10A rectifier transformer
  156. Free Canadian Westinghouse Receiver #101: Super Heterodyne
  157. 6AS7 SET amp discussion from Photo Gallery
  158. DHT 100hz hum
  159. HP 8903B and Pete Millett's Software Problem ?
  160. How to identify an ARC D70 version ?
  161. Valve amp first build - questions
  162. Transfrmer Impedance Question
  163. Disappointing results from RH84
  164. Anyone Loose a Counterpoint SA-5000?
  165. Installing a 610 in to a B&K 500
  166. My first tube preamp (4S)....
  167. Recycling old iron with stiff wires.
  168. 6EM7 as driver... help !!!
  169. changing R1 value in SE amp
  170. Heater CCS makes for low voltage
  171. DHT & Indirect on same line?
  172. Which tube preamplifier kit for LM3886 amplifier?
  173. budgie pre-amp
  174. ecl82 class A pp, need schematic
  175. Input low pass preferred method
  176. cary SLP50A
  177. se output options for single/balanced tda1541
  178. FM noise in Fisher 90-T in FM mode
  179. ST Triodes?
  180. TUBECAD SE.
  181. RH84 build with SS recto and voltage doubler (any input?)
  182. Tube identification
  183. Brand new cap overheating - argh
  184. High Power Valves
  185. Tubelab SSE B+ and cathode resistor questions
  186. HIFI world 6080 se
  187. EF86 triode question
  188. Connecting a Headphone Jack to a Preamp
  189. PSE 300B "French connexion"
  190. Making a custom tube characteristic graph
  191. 300B DRD power supply
  192. Insanely High Common Mode Voltage Shunt Measurement
  193. Heathkit AA-151 troubles
  194. Tube Power supply question...
  195. Noob question on power transformer primary input voltage
  196. Dynaco ST35 testing for a blown power transformer
  197. 6n6p tube buffer
  198. Welborne Labs
  199. GU-50 triode
  200. Help track down noise in gyrator
  201. Earphone Amp Improvements
  202. Protecting Wire
  203. 45 SET : tubelab vs get*set*go vs ?
  204. 6SL7 in Maggy 175 amp...
  205. Heater soft start for series-connected preamp valves
  206. low/no gain follower
  207. Data for 6BD2A or 6BD2
  208. isolation test
  209. Western Electric 437A preamp
  210. solid-state rectrification
  211. Class AB
  212. push-pull
  213. Need help ID tango-lookalike transformers
  214. TV Valves blast from the past..
  215. Tubes suggestions for parafeed headphones amp ?
  216. CCS Loadline
  217. Universal pover supply for ECC85 EL84
  218. Conversion Project
  219. Dynaco PAS I/O PCB Grounding
  220. CCS for anode load
  221. OTL Power Supply: Halfwave vs Virtual Ground
  222. Can NOS tubes have emission staining on the glass?
  223. Pentode pre/compressor (warning nube attempt at circuit drafting) --suppressor grid
  224. Capacitor Drain for Tube Bench Power Supply ?
  225. Diodes, diodes, diodes...
  226. Grid leak resistors and dc-coupling
  227. Output transformer at speaker?
  228. Newbie just wondering if this PP amp looks ok
  229. 6P36S push pull HiFi amp
  230. Another Output Transformer Wiring Question
  231. Cathode bias for EL84 PPP
  232. Output Transformer Wiring Question
  233. NJ7P Tube Database
  234. solving my old radiogram sound issues - help
  235. 6H9c Idle Current.
  236. 12E1 SE amp suggestions.
  237. Direct Coupled Output Stage, DC Bias Balance
  238. Pre-amp tube suggestions for 2A3 output tube
  239. AirTight ATM-1 Schematic
  240. Counterpoint SA 5000 Service manual and PSU
  241. Rectifier tube ? - Berman 76 preamp
  242. Cathode feedback (SE amp)
  243. Will anybody interest in stamp size ccs module?
  244. Fairchild voltage questions
  245. Help with a Sylvania 7695 Project
  246. Flicker Noise dominates triode noise in audio (AES)
  247. A tube for SE with 1k-1k5 load
  248. scott stereomaster 233 restoration
  249. Homebrew Dynaco MkIII Problems - PLEASE HELP!
  250. What to do with C3g tubes

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