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  1. I can buy some 6U9's cheap - are they any good, and what could I build?
  2. K8011/K8010 PCB build thread
  3. Choosing an op point when using a tube 'off label'
  4. Choke inputs
  5. Unbalanced In > Balanced Out line amp - How To Do It?
  6. 6146b output transformer. I'm new and I need help.
  7. Your first DiY Low Cost/Low Voltage tube AMP
  8. Need some advice on OPT for kt88/6l6
  9. 1:1:1 transformers
  10. Output transformer in the cathode?
  11. Popping DC
  12. Power transformer wiring issues
  13. easy question - Magnavox 86-01 owners...
  14. What's the Best Way to Reduce Gain in a Preamp
  15. safety with high voltage input capacitor ?
  16. SE EL84 amp - reducing 100Hz hum
  17. Photos of large DHT preamps? (Or large amps in general)
  18. Minimum pin length (noval)
  19. Biasing of KT120
  20. SE to balanced transformer
  21. Decoupling Cap value - How Much?
  22. Cathode bypass Cap vs. No Bypass Cap
  23. Interesting circuit I thought.
  24. Yet another K12G thread
  25. 6N3 tube preamp question
  26. Driver vs Power tube
  27. Help in Bias tube amp for Adis Devy 7
  28. Tubes and HT
  29. HiFiMan EF-2A schematic sought
  30. Please, help with a WE91 project on behalf of a friend
  31. Proposed Headphone Amp Overhaul?
  32. protection of downstream line amp
  33. Is the 6E6P suitable for audio?
  34. me clone proto EL/PL 504
  35. Improving headphone amplifier
  36. 5902 LSTPICE Model
  37. Canary CA-301 PSU
  38. 3B28 oscilator
  39. A lot of schematics
  40. V8 amp
  41. market by Jac music
  42. 6P3C-1 SE ? .
  43. Cary slp70: Worth to upgrade?
  44. Adding NFB makes headphone amp sound AWFUL!!!
  45. Filaments hard wired to B+ on EZ81 base
  46. What the bird is OS 18/600?
  47. ccs 10m90s what is wrong?
  48. Topology for balanced preamp
  49. 6v6 vs. 6l6 vs. 807 soundwise..
  50. Opinions/Advice on Triode Strap method
  51. Something like a Miniwatt N3 or APPJ PA0901A
  52. Extraordinary harmonics. Type 47 # tube amp.
  53. Made a new tube amp, 6J5 +27 +45
  54. Anyone ever play around with a GU-72?
  55. Possibility of using a UTC LMI-500 transformer...
  56. Aikido transformer
  57. Can someone explain why you need to re-adjust the balance on a tube amp every time
  58. Which factory made these tubes ?
  59. 813 and gm70
  60. 13E1 Push Pull
  61. dump find.
  62. ...6SN7GT operating points tube help.......
  63. 6L6 6SJ7 Amp please pick faults if any
  64. Updated DIY EL34B 6SJ7 SE Amp
  65. 6C18 x 6C33
  66. Vintage tube amp find
  67. any benefit to screen-grid drive a 6V6?
  68. Brown face Scott LK72
  69. Pilot 1060 integrated - make it better!
  70. Should I ground my K12G or my Bugle 2?
  71. 6c33 amp convert to 6c41
  72. STA-LEVEL thumbs problem
  73. Amp motorboating at power up
  74. Spice models for AL4 and RS242 tubes
  75. Mains Switch
  76. Suggestions for big output stage needed
  77. Very Good (or best?) 12B4 schematic?
  78. Amplifier for active bookshelf speakers
  79. Olson AM-240 schematic needed
  80. Valve amp - maintenance
  81. Your opinion about Rotel 930AX to hyrbid mod
  82. Tube circuit sim software for free?
  83. 6v6 family tubes
  84. Troublesome bias resistor, cathodyne stage
  85. 6AQ5 excellent for line stage?
  86. Datasheet 6P42s and 6P45C
  87. Quad / Cyrus impedance matching
  88. Zobel network at primary audio trafo?
  89. ECL86 question
  90. 500c buzzing power transformer
  91. LM4702+6L6GB/807
  92. Finally started on my 6L6 amp. Need tube suggestions.
  93. Just another Scott thread
  94. Seeking Articals On Audio Transformer Design & Construction.
  95. Bias el34 pp
  96. Photo Gallery.
  97. Precision S35
  98. 6L6WGB
  99. 6BQ7A Driver
  100. Advise for Simpson 340 signal generator problem
  101. Armaco TTHF or Calrad AP 15 What to do What to do?...
  102. Screen Power and Warmup
  103. Wanting copies of Prof. Alexander Bereskin's transformer winding pictures.
  104. Edcor CXSE25-8-3.2K or Transcendar TT-017-OT?
  105. PP 2A3 Fixed Bias
  106. RL12P35 convert to el34
  107. Statistical regulator from VA 4rd edition
  108. Matching Impedances (the Math behind it) Please Advise if you have a grasp. Xfmrs etc
  109. Help 6AQ5 pushpull
  110. Valve heater question
  111. Phase inverter adjustment - Fisher 80AZ
  112. Repurposing a Bogen CHB-35A
  113. SMPS
  114. Interstage and bias failure
  115. Grid 2 current for GU19-1
  116. 6x5 tube
  117. IT coupled 6BG6GA
  118. Mystery noise has got me baffled
  119. Dynaco PAS: too much liposuction?
  120. LP Tape Noise
  121. YAKOV ARONOV MA-100
  122. Help for balance-tone control-mode selector bypass
  123. Design of transformers for valve amplifiers
  124. Opinions please: seeking a first class DIY SET amp design
  125. PSU for 6N6P
  126. HOT B+ capacitors!
  127. Analog meter monitoring HT supply
  128. Lamm LL2.1 DC Offset problem
  129. 6L6GT/6SJ7 Valve Amp DIY
  130. BHExchange for BottleHead's
  131. 6BY5GA elevated heater question
  132. Tone controls
  133. EL84 "IP" questions
  134. KIT Single ended KT88
  135. HELP needed - LEAK Varislope 2 Stereo + Stereo 20 with pictures...
  136. All tube cap tube amp?
  137. 12AX7 preamp for DAC
  138. Grid resistors -> GND
  139. OTL headphone amp distorting & clipping: weak power supply?
  140. Broken bias resistors (Yaqin MC-10L)
  141. Tube Enclosure suggestion from Europe.
  142. Benefit/SQ of tube stage at the input of ss power amp
  143. Is 6907 and QQV03-20A tubes are same?
  144. Found some chokes
  145. 6SN7 at low plate currents
  146. 12AU7, 12BH7, Darker Less Bright Option
  147. Heater current effects
  148. Not using all the sections on multi-section cap
  149. DC heater supply dies on me
  150. 1972 Leak Varislope 2 Stereo
  151. OPT secondary ground, stacked supplies
  152. OTL for HeaPhone
  153. Voltage doubler and filament supply
  154. Please suggest me a 6V6 class AB amp
  155. Need Review of wiring up of this SRPP 6AS7 tube amp
  156. Hum in a triode 1H6G...help !
  157. 40w Class A PP KT66?
  158. My new small amp EL84 SE Triode
  159. tube preamp output impedance
  160. pete millet 807 amp
  161. Lost Negative Bias-Fixed Bias
  162. Aikido ('dead quiet') output impedance
  163. Looking for lineamp buffer schematics
  164. Nagra VPA 845
  165. How to match 6C45?
  166. Yet another question about cathode bias (led+pnp)
  167. What replaces an IN541 diode?
  168. Bottlehead Eros or Tube4Hifi PH16
  169. Psvane 2a3 T Mk II reliable vender
  170. Odd Wima cap markings
  171. Chinese Amp kit experience
  172. Considerations about headph. OCL
  173. Trying to solve a Plate Follower Problem
  174. Footprint Noval ECC83 Altium
  175. Interference in hybrid amp
  176. wiring DHT filaments with center tapped secondaries
  177. B+ of Curcio Daniel II
  178. Stepped Attenuators Questions
  179. Noisy Ground? (Probably not a loop)
  180. New Production Telefunken
  181. Tube horizontal mounting position
  182. "Ask Jan First" parts website in Germany
  183. EZ215 Stereo 5881 Amp Project
  184. CCS help dn2540 send 340v to the chassis
  185. That's What She Said RH84 Build Log
  186. Help figuring out this output transformer.
  187. 5881 PPP Cathode Bias B+
  188. Measuring DHT filament V with minimal effect.
  189. 100hz hum with Audio Research vs-55
  190. Volume potentiometer
  191. Driver for 2A3C
  192. Regulated B+ sounds worse?
  193. Sylvania console amp rebuild...
  194. E130L Micron
  195. Question Re: Ground Loop Breakers
  196. Source for D3A/7721?
  197. ID a salvaged choke
  198. Magnetwire gauge size converted to metric
  199. ccs what is the best way
  200. parafeed test/measurement setup question.
  201. how do balance pots work?
  202. Issue with parafeed in SPICE
  203. GU-50 Dissected
  204. Need help on ground wiring for Scott 222-B
  205. Heathkit A9-C Mod
  206. Need a 240v, 5vac - 6-10A rectifier transformer
  207. Free Canadian Westinghouse Receiver #101: Super Heterodyne
  208. 6AS7 SET amp discussion from Photo Gallery
  209. DHT 100hz hum
  210. How to identify an ARC D70 version ?
  211. Valve amp first build - questions
  212. Transfrmer Impedance Question
  213. Disappointing results from RH84
  214. Anyone Loose a Counterpoint SA-5000?
  215. Installing a 610 in to a B&K 500
  216. My first tube preamp (4S)....
  217. Recycling old iron with stiff wires.
  218. 6EM7 as driver... help !!!
  219. changing R1 value in SE amp
  220. Heater CCS makes for low voltage
  221. DHT & Indirect on same line?
  222. Which tube preamplifier kit for LM3886 amplifier?
  223. budgie pre-amp
  224. ecl82 class A pp, need schematic
  225. Input low pass preferred method
  226. cary SLP50A
  227. se output options for single/balanced tda1541
  228. FM noise in Fisher 90-T in FM mode
  229. ST Triodes?
  230. TUBECAD SE.
  231. RH84 build with SS recto and voltage doubler (any input?)
  232. Tube identification
  233. Brand new cap overheating - argh
  234. High Power Valves
  235. HIFI world 6080 se
  236. EF86 triode question
  237. Connecting a Headphone Jack to a Preamp
  238. PSE 300B "French connexion"
  239. Making a custom tube characteristic graph
  240. 300B DRD power supply
  241. Insanely High Common Mode Voltage Shunt Measurement
  242. Heathkit AA-151 troubles
  243. Tube Power supply question...
  244. Noob question on power transformer primary input voltage
  245. Dynaco ST35 testing for a blown power transformer
  246. 6n6p tube buffer
  247. Welborne Labs
  248. GU-50 triode
  249. Help track down noise in gyrator
  250. Earphone Amp Improvements

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