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  1. Adding tone controls
  2. TJ Full Music 2A3/CNE
  3. groove tubes for headphone amp
  4. IXYS LTSpice Models (or something equivalent?)
  5. Soviet 6p3s/6p3s-e
  6. A case of direct coupled cathode follower
  7. SE45 schematic monoblock to stereo help
  8. Heathkit Schematics & Manuals
  9. 211 tube amp problem Help
  10. Department of inapprehensible schematics
  11. How low can you go...?
  12. EL34/6L6 Screen reistors...
  13. 809, anyone played around with them?
  14. Skinny OTL
  15. Adjust drive and output level with one knob
  16. Help me rack some Gates Program Amps
  17. Switch Mode Heater Supply
  18. Pre Ampje
  19. Maida Regulator Digital Control
  20. Worried by 110v reading on 6.3v tap....
  21. Safety Alert - UK Yaqin users
  22. 27> EL34 (triode) > 300B
  23. Rockola juke box amp - unusual features
  24. 3.5 watt ECL82 Amp
  25. 12BH7 Headphone Amp
  26. White Cathode Follower Quandary
  27. help in aikido for sennheiser hd580
  28. Home brew more economical than an ST-35
  29. Modeling Pull-Push transformer in LTspice
  30. The Fisher 400-C "Fixer-upper"
  31. Power Transformer question/concern
  32. Nice little schematic drawing app w/ tube symbols
  33. best budget diy kit?
  34. Transconductance amplifier for headphones.
  35. El Cheapo information?
  36. Aikido 9-Pin Configuration
  37. Strange motorboating issue
  38. Lumley M120 Monoblocks - Need Manual, schematic or anything !!!
  39. Substituting higher wattage resistors
  40. cap coupling to interstage transformer or direct coupling?
  41. A question of feedback..
  42. Two Monoblocks "Dying" Within Days Of Each Other
  43. Russian 1Zh24B Pentods / design assistance.
  44. What Tubes for 5.8k PP transformers
  45. Problem with a power transformer.
  46. 300B OTL Preamp/Headphone Amp
  47. tantalum resistors
  48. 6BM8 in STC mode
  49. My Moscode again: What is the bias current?
  50. OTL WCF headphone amp build + awesome prototype material
  51. Type 42 single ended ideas
  52. Help with my Moscode 300 amp
  53. Thoughts on this volume potentiometer?
  54. Optimum load impedance for PCL85?
  55. Croatian triode Festival 2014.
  56. Old ekco tv transformers
  57. vacuum tube score.. what to do with
  58. Valve based disco mixer.
  59. Webcor ceramic phono input circuitry suggestions?
  60. Position of OPT windings
  61. sd2 seven pin??
  62. Help design a Small 250VDC PSU for tube preamp
  63. Bright Driver Tubes 12AU7, 12BH7, 5814...
  64. Question about using tube socket center hole for star ground
  65. Heathkit UA-2 clone project
  66. Schematic CAD Program
  67. Latest on the RH amps..
  68. Transformer design program
  69. 807 "Musicians Amplifier" help
  70. J.E. LABS PP2A3 POWER SUPPLY ?
  71. Mono Block Building Project
  72. EL34 CCS ideas
  73. Magnavox 8601-20
  74. wood/metal vs all-metal chassis
  75. Design data on dry battery tubes
  76. Differential tube with a gain stage 1178
  77. 6C4C tube ...Good to buy ?
  78. Including a C- winding on a filament transformer
  79. CINEMAG 15B TRANSFORMERS balanced>unbalanced
  80. Rebuilt Heathkit AA32 with hum on MAG PHONO input
  81. Tube Socket ID
  82. JJ 5Y3S is too tall...need smaller tube
  83. Uniamp 2A3
  84. buzz noise from paraphase circuit
  85. Benefits of Enhanced Triode Connection
  86. Working out a valves load resistance?
  87. 813 Alternatives
  88. Help 6N6T pinout
  89. Very large parafeed cap
  90. Bright purple flash 6N1P
  91. Harman Kardon Citation II - rebuild questions
  92. Stoetkit junior mk2
  93. 1619 Push pull output stage
  94. Tube getter
  95. The sensation of the 21st Century. Galvanic SUPER HIGH END PP power for all types of
  96. Audible Illusions and 6922
  97. quick access tube amp protection
  98. Identifying Genalex KT66 matched pair question
  99. Hunting 100Hz noise in SRPP+ stage
  100. JJ ECC83S Biasing conditions
  101. Audiophiletalk - Dirt Cheap SE
  102. 12AL8 Head-Amp with UTC Output Transformer
  103. SET monoblocks?
  104. EL84 Push Pull design from left over parts
  105. Strange UL Transformers
  106. Stabilization balanced currents in the PP stage.
  107. Current mirror stage in PP
  108. EL34 SE ultralinear schematic
  109. Question: Acceptable DC current in push-pull output transformer due to tube mismatch?
  110. Toroid Power Transformer For GM-70 845 211 1000V
  111. Building the "Crystal Palace" Amp
  112. Improved Sound Card Interface - Ideas and Suggestions?
  113. Upgrading OPTs in production amp? (Yaquin MC-10L)
  114. any good Triode 6H8C preamp schematics out there???
  115. pushpull 6aq5 distortion
  116. Mr. Lian 845 SET more kit rather than commercial product.
  117. Opinion for otl ocl headphone amp
  118. Tube-newby wanting to make a good tube amp
  119. Anyone used a voltage tripler PS?
  120. Audioromy 828A / FU-29 tube layout
  121. Choosing Cathode Bypass Capacitor
  122. Ground loop gremlins
  123. Crackling Amp after Accident
  124. New CCS/ depletion mode MOSFETs available... experience anyone?
  125. Mengyue Mini
  126. Parafeed quest
  127. Determining linearity - differential gain stage
  128. 6HB6 - Any pratical experience?
  129. 27 Tube Preamp design questions
  130. Output Transformers Mount Position
  131. Critique please: Fixed bias 7591 SE
  132. Coupling Cap Improvements?
  133. RL 12T 15
  134. Tube instead of anode resistor
  135. HELP!! Terrible 50Hz hum in Mullard 10W DIY amp
  136. My New 45 SET (choke-loaded 6SN7, direct-coupled)
  137. Hf31 fidelity valve type
  138. Design of transformers for valve amplifiers.Part2
  139. Harman Kardon ta5000X alignment/manual
  140. Help with an analog meter hack
  141. dirkwright phono
  142. Zener Voltage Regulator
  143. Fisher X-101-B Substitute for 7591
  144. UNU-pnono riaa mm preamp
  145. My old amps
  146. Switching regulator on Kickstarter
  147. my yaqin 100b will not bias on v1 v3
  148. Zenith model B835R
  149. Want to build 2a3 amp for old radio
  150. Preamp Advice
  151. simple 5687 pre amp help
  152. Pulling TV From 61 Maggie Imperial Console?
  153. I can buy some 6U9's cheap - are they any good, and what could I build?
  154. K8011/K8010 PCB build thread
  155. Choosing an op point when using a tube 'off label'
  156. Choke inputs
  157. Unbalanced In > Balanced Out line amp - How To Do It?
  158. 6146b output transformer. I'm new and I need help.
  159. Your first DiY Low Cost/Low Voltage tube AMP
  160. Need some advice on OPT for kt88/6l6
  161. 1:1:1 transformers
  162. Output transformer in the cathode?
  163. Popping DC
  164. Power transformer wiring issues
  165. easy question - Magnavox 86-01 owners...
  166. Mic preamp input transformer alternative?
  167. What's the Best Way to Reduce Gain in a Preamp
  168. safety with high voltage input capacitor ?
  169. SE EL84 amp - reducing 100Hz hum
  170. Photos of large DHT preamps? (Or large amps in general)
  171. Minimum pin length (noval)
  172. Biasing of KT120
  173. SE to balanced transformer
  174. Decoupling Cap value - How Much?
  175. Cathode bypass Cap vs. No Bypass Cap
  176. Interesting circuit I thought.
  177. Yet another K12G thread
  178. 6N3 tube preamp question
  179. Driver vs Power tube
  180. Help in Bias tube amp for Adis Devy 7
  181. Tubes and HT
  182. HiFiMan EF-2A schematic sought
  183. Please, help with a WE91 project on behalf of a friend
  184. Proposed Headphone Amp Overhaul?
  185. protection of downstream line amp
  186. Is the 6E6P suitable for audio?
  187. me clone proto EL/PL 504
  188. Improving headphone amplifier
  189. 5902 LSTPICE Model
  190. Canary CA-301 PSU
  191. 3B28 oscilator
  192. A lot of schematics
  193. V8 amp
  194. market by Jac music
  195. 6P3C-1 SE ? .
  196. Cary slp70: Worth to upgrade?
  197. Hickok 123B tube tester
  198. Adding NFB makes headphone amp sound AWFUL!!!
  199. Filaments hard wired to B+ on EZ81 base
  200. What the bird is OS 18/600?
  201. ccs 10m90s what is wrong?
  202. Topology for balanced preamp
  203. 6v6 vs. 6l6 vs. 807 soundwise..
  204. Opinions/Advice on Triode Strap method
  205. Something like a Miniwatt N3 or APPJ PA0901A
  206. Extraordinary harmonics. Type 47 # tube amp.
  207. Made a new tube amp, 6J5 +27 +45
  208. Anyone ever play around with a GU-72?
  209. Possibility of using a UTC LMI-500 transformer...
  210. Aikido transformer
  211. Can someone explain why you need to re-adjust the balance on a tube amp every time
  212. Which factory made these tubes ?
  213. 813 and gm70
  214. 13E1 Push Pull
  215. dump find.
  216. ...6SN7GT operating points tube help.......
  217. 6L6 6SJ7 Amp please pick faults if any
  218. Updated DIY EL34B 6SJ7 SE Amp
  219. 6C18 x 6C33
  220. Vintage tube amp find
  221. any benefit to screen-grid drive a 6V6?
  222. Brown face Scott LK72
  223. Pilot 1060 integrated - make it better!
  224. Should I ground my K12G or my Bugle 2?
  225. 6c33 amp convert to 6c41
  226. STA-LEVEL thumbs problem
  227. Amp motorboating at power up
  228. Spice models for AL4 and RS242 tubes
  229. Mains Switch
  230. Suggestions for big output stage needed
  231. Very Good (or best?) 12B4 schematic?
  232. Amplifier for active bookshelf speakers
  233. Olson AM-240 schematic needed
  234. Valve amp - maintenance
  235. Your opinion about Rotel 930AX to hyrbid mod
  236. Weston Tube Tester 774-5
  237. Tube circuit sim software for free?
  238. 6v6 family tubes
  239. Troublesome bias resistor, cathodyne stage
  240. 6AQ5 excellent for line stage?
  241. Datasheet 6P42s and 6P45C
  242. Quad / Cyrus impedance matching
  243. Zobel network at primary audio trafo?
  244. ECL86 question
  245. 500c buzzing power transformer
  246. LM4702+6L6GB/807
  247. TubeAudio Mixer Blog
  248. Finally started on my 6L6 amp. Need tube suggestions.
  249. Just another Scott thread
  250. Design for overdriven output stage

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