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  1. SE to balanced transformer
  2. Decoupling Cap value - How Much?
  3. Cathode bypass Cap vs. No Bypass Cap
  4. Interesting circuit I thought.
  5. Yet another K12G thread
  6. 6N3 tube preamp question
  7. Driver vs Power tube
  8. Help in Bias tube amp for Adis Devy 7
  9. Tubes and HT
  10. HiFiMan EF-2A schematic sought
  11. Please, help with a WE91 project on behalf of a friend
  12. Proposed Headphone Amp Overhaul?
  13. protection of downstream line amp
  14. Is the 6E6P suitable for audio?
  15. me clone proto EL/PL 504
  16. Improving headphone amplifier
  17. 5902 LSTPICE Model
  18. Canary CA-301 PSU
  19. 3B28 oscilator
  20. A lot of schematics
  21. V8 amp
  22. market by Jac music
  23. 6P3C-1 SE ? .
  24. Cary slp70: Worth to upgrade?
  25. Hickok 123B tube tester
  26. Adding NFB makes headphone amp sound AWFUL!!!
  27. Filaments hard wired to B+ on EZ81 base
  28. What the bird is OS 18/600?
  29. ccs 10m90s what is wrong?
  30. Topology for balanced preamp
  31. 6v6 vs. 6l6 vs. 807 soundwise..
  32. Opinions/Advice on Triode Strap method
  33. Something like a Miniwatt N3 or APPJ PA0901A
  34. Extraordinary harmonics. Type 47 # tube amp.
  35. Made a new tube amp, 6J5 +27 +45
  36. Anyone ever play around with a GU-72?
  37. Possibility of using a UTC LMI-500 transformer...
  38. Aikido transformer
  39. Can someone explain why you need to re-adjust the balance on a tube amp every time
  40. Which factory made these tubes ?
  41. 813 and gm70
  42. 13E1 Push Pull
  43. dump find.
  44. ...6SN7GT operating points tube help.......
  45. 6L6 6SJ7 Amp please pick faults if any
  46. Updated DIY EL34B 6SJ7 SE Amp
  47. 6C18 x 6C33
  48. Vintage tube amp find
  49. any benefit to screen-grid drive a 6V6?
  50. Brown face Scott LK72
  51. Pilot 1060 integrated - make it better!
  52. Should I ground my K12G or my Bugle 2?
  53. 6c33 amp convert to 6c41
  54. STA-LEVEL thumbs problem
  55. Amp motorboating at power up
  56. Spice models for AL4 and RS242 tubes
  57. Mains Switch
  58. Suggestions for big output stage needed
  59. Very Good (or best?) 12B4 schematic?
  60. Amplifier for active bookshelf speakers
  61. Olson AM-240 schematic needed
  62. Valve amp - maintenance
  63. Your opinion about Rotel 930AX to hyrbid mod
  64. Weston Tube Tester 774-5
  65. Tube circuit sim software for free?
  66. 6v6 family tubes
  67. Troublesome bias resistor, cathodyne stage
  68. 6AQ5 excellent for line stage?
  69. Datasheet 6P42s and 6P45C
  70. Quad / Cyrus impedance matching
  71. Zobel network at primary audio trafo?
  72. ECL86 question
  73. 500c buzzing power transformer
  74. LM4702+6L6GB/807
  75. TubeAudio Mixer Blog
  76. Finally started on my 6L6 amp. Need tube suggestions.
  77. Just another Scott thread
  78. Design for overdriven output stage
  79. Seeking Articals On Audio Transformer Design & Construction.
  80. Bias el34 pp
  81. Photo Gallery.
  82. Precision S35
  83. 6L6WGB
  84. 6BQ7A Driver
  85. Advise for Simpson 340 signal generator problem
  86. Armaco TTHF or Calrad AP 15 What to do What to do?...
  87. Screen Power and Warmup
  88. Wanting copies of Prof. Alexander Bereskin's transformer winding pictures.
  89. what's the brand of this capacitor sounds great ?
  90. Edcor CXSE25-8-3.2K or Transcendar TT-017-OT?
  91. PP 2A3 Fixed Bias
  92. RL12P35 convert to el34
  93. Statistical regulator from VA 4rd edition
  94. Matching Impedances (the Math behind it) Please Advise if you have a grasp. Xfmrs etc
  95. Help 6AQ5 pushpull
  96. HV Logic Control Approach
  97. Valve heater question
  98. Phase inverter adjustment - Fisher 80AZ
  99. Repurposing a Bogen CHB-35A
  100. SMPS
  101. Interstage and bias failure
  102. Grid 2 current for GU19-1
  103. 6x5 tube
  104. IT coupled 6BG6GA
  105. Mystery noise has got me baffled
  106. Dynaco PAS: too much liposuction?
  107. LP Tape Noise
  108. YAKOV ARONOV MA-100
  109. Help for balance-tone control-mode selector bypass
  110. Design of transformers for valve amplifiers
  111. Opinions please: seeking a first class DIY SET amp design
  112. PSU for 6N6P
  113. HOT B+ capacitors!
  114. Analog meter monitoring HT supply
  115. Lamm LL2.1 DC Offset problem
  116. 6L6GT/6SJ7 Valve Amp DIY
  117. BHExchange for BottleHead's
  118. 6BY5GA elevated heater question
  119. Tone controls
  120. EL84 "IP" questions
  121. KIT Single ended KT88
  122. HELP needed - LEAK Varislope 2 Stereo + Stereo 20 with pictures...
  123. All tube cap tube amp?
  124. 12AX7 preamp for DAC
  125. Grid resistors -> GND
  126. OTL headphone amp distorting & clipping: weak power supply?
  127. Broken bias resistors (Yaqin MC-10L)
  128. Tube Enclosure suggestion from Europe.
  129. Benefit/SQ of tube stage at the input of ss power amp
  130. Is 6907 and QQV03-20A tubes are same?
  131. Found some chokes
  132. 6SN7 at low plate currents
  133. 12AU7, 12BH7, Darker Less Bright Option
  134. Heater current effects
  135. Not using all the sections on multi-section cap
  136. DC heater supply dies on me
  137. 1972 Leak Varislope 2 Stereo
  138. OPT secondary ground, stacked supplies
  139. OTL for HeaPhone
  140. Voltage doubler and filament supply
  141. Please suggest me a 6V6 class AB amp
  142. Need Review of wiring up of this SRPP 6AS7 tube amp
  143. Hum in a triode 1H6G...help !
  144. 40w Class A PP KT66?
  145. My new small amp EL84 SE Triode
  146. tube preamp output impedance
  147. pete millet 807 amp
  148. Lost Negative Bias-Fixed Bias
  149. Aikido ('dead quiet') output impedance
  150. Looking for lineamp buffer schematics
  151. Nagra VPA 845
  152. How to match 6C45?
  153. Yet another question about cathode bias (led+pnp)
  154. Ideal System for 1960?
  155. What replaces an IN541 diode?
  156. Bottlehead Eros or Tube4Hifi PH16
  157. Psvane 2a3 T Mk II reliable vender
  158. Odd Wima cap markings
  159. Chinese Amp kit experience
  160. Considerations about headph. OCL
  161. Trying to solve a Plate Follower Problem
  162. Nichicon Caps
  163. Footprint Noval ECC83 Altium
  164. Interference in hybrid amp
  165. wiring DHT filaments with center tapped secondaries
  166. B+ of Curcio Daniel II
  167. Stepped Attenuators Questions
  168. Noisy Ground? (Probably not a loop)
  169. New Production Telefunken
  170. Tube horizontal mounting position
  171. "Ask Jan First" parts website in Germany
  172. EZ215 Stereo 5881 Amp Project
  173. CCS help dn2540 send 340v to the chassis
  174. That's What She Said RH84 Build Log
  175. Help figuring out this output transformer.
  176. 5881 PPP Cathode Bias B+
  177. Measuring DHT filament V with minimal effect.
  178. 100hz hum with Audio Research vs-55
  179. Volume potentiometer
  180. Driver for 2A3C
  181. Regulated B+ sounds worse?
  182. Sylvania console amp rebuild...
  183. E130L Micron
  184. Question Re: Ground Loop Breakers
  185. Source for D3A/7721?
  186. ID a salvaged choke
  187. Magnetwire gauge size converted to metric
  188. ccs what is the best way
  189. parafeed test/measurement setup question.
  190. how do balance pots work?
  191. Issue with parafeed in SPICE
  192. GU-50 Dissected
  193. Need help on ground wiring for Scott 222-B
  194. Heathkit A9-C Mod
  195. Need a 240v, 5vac - 6-10A rectifier transformer
  196. Free Canadian Westinghouse Receiver #101: Super Heterodyne
  197. 6AS7 SET amp discussion from Photo Gallery
  198. DHT 100hz hum
  199. HP 8903B and Pete Millett's Software Problem ?
  200. How to identify an ARC D70 version ?
  201. Valve amp first build - questions
  202. Transfrmer Impedance Question
  203. Disappointing results from RH84
  204. Anyone Loose a Counterpoint SA-5000?
  205. Installing a 610 in to a B&K 500
  206. My first tube preamp (4S)....
  207. Recycling old iron with stiff wires.
  208. 6EM7 as driver... help !!!
  209. changing R1 value in SE amp
  210. Heater CCS makes for low voltage
  211. DHT & Indirect on same line?
  212. Which tube preamplifier kit for LM3886 amplifier?
  213. budgie pre-amp
  214. ecl82 class A pp, need schematic
  215. Input low pass preferred method
  216. cary SLP50A
  217. Bottlehead Crack - Illustrated write-up
  218. se output options for single/balanced tda1541
  219. FM noise in Fisher 90-T in FM mode
  220. ST Triodes?
  221. TUBECAD SE.
  222. RH84 build with SS recto and voltage doubler (any input?)
  223. Tube identification
  224. Brand new cap overheating - argh
  225. High Power Valves
  226. Tubelab SSE B+ and cathode resistor questions
  227. HIFI world 6080 se
  228. EF86 triode question
  229. Connecting a Headphone Jack to a Preamp
  230. PSE 300B "French connexion"
  231. Making a custom tube characteristic graph
  232. 300B DRD power supply
  233. Insanely High Common Mode Voltage Shunt Measurement
  234. Heathkit AA-151 troubles
  235. Tube Power supply question...
  236. Noob question on power transformer primary input voltage
  237. Dynaco ST35 testing for a blown power transformer
  238. 6n6p tube buffer
  239. Welborne Labs
  240. GU-50 triode
  241. Help track down noise in gyrator
  242. Earphone Amp Improvements
  243. Protecting Wire
  244. 45 SET : tubelab vs get*set*go vs ?
  245. 6SL7 in Maggy 175 amp...
  246. Heater soft start for series-connected preamp valves
  247. low/no gain follower
  248. Data for 6BD2A or 6BD2
  249. isolation test
  250. Western Electric 437A preamp

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