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View Full Version : Tubes / Valves


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  1. Photo of a JJ 300B Filaments!! Please! :)
  2. Super FU-29
  3. Questions about Tim Mellow 6C33C OTL
  4. James or Silk for EL36SE?
  5. Dead KT88
  6. MS 110B KT88 INTEGRATED AMPLIFIER
  7. The Mighty 6550...
  8. recomend me some EL34 PLEASE
  9. Adding tone controls
  10. TJ Full Music 2A3/CNE
  11. groove tubes for headphone amp
  12. IXYS LTSpice Models (or something equivalent?)
  13. Soviet 6p3s/6p3s-e
  14. A case of direct coupled cathode follower
  15. SE45 schematic monoblock to stereo help
  16. Heathkit Schematics & Manuals
  17. 211 tube amp problem Help
  18. Department of inapprehensible schematics
  19. How low can you go...?
  20. EL34/6L6 Screen reistors...
  21. 809, anyone played around with them?
  22. Skinny OTL
  23. Adjust drive and output level with one knob
  24. Help me rack some Gates Program Amps
  25. Switch Mode Heater Supply
  26. Pre Ampje
  27. Maida Regulator Digital Control
  28. Worried by 110v reading on 6.3v tap....
  29. Safety Alert - UK Yaqin users
  30. 27> EL34 (triode) > 300B
  31. Rockola juke box amp - unusual features
  32. 3.5 watt ECL82 Amp
  33. 12BH7 Headphone Amp
  34. White Cathode Follower Quandary
  35. help in aikido for sennheiser hd580
  36. Home brew more economical than an ST-35
  37. Modeling Pull-Push transformer in LTspice
  38. The Fisher 400-C "Fixer-upper"
  39. Power Transformer question/concern
  40. Nice little schematic drawing app w/ tube symbols
  41. best budget diy kit?
  42. Transconductance amplifier for headphones.
  43. El Cheapo information?
  44. Aikido 9-Pin Configuration
  45. Strange motorboating issue
  46. Lumley M120 Monoblocks - Need Manual, schematic or anything !!!
  47. Substituting higher wattage resistors
  48. cap coupling to interstage transformer or direct coupling?
  49. A question of feedback..
  50. Two Monoblocks "Dying" Within Days Of Each Other
  51. Russian 1Zh24B Pentods / design assistance.
  52. What Tubes for 5.8k PP transformers
  53. Problem with a power transformer.
  54. 300B OTL Preamp/Headphone Amp
  55. tantalum resistors
  56. 6BM8 in STC mode
  57. My Moscode again: What is the bias current?
  58. OTL WCF headphone amp build + awesome prototype material
  59. Type 42 single ended ideas
  60. Help with my Moscode 300 amp
  61. Thoughts on this volume potentiometer?
  62. Optimum load impedance for PCL85?
  63. Croatian triode Festival 2014.
  64. Old ekco tv transformers
  65. vacuum tube score.. what to do with
  66. Valve based disco mixer.
  67. Webcor ceramic phono input circuitry suggestions?
  68. Position of OPT windings
  69. sd2 seven pin??
  70. Help design a Small 250VDC PSU for tube preamp
  71. Bright Driver Tubes 12AU7, 12BH7, 5814...
  72. Question about using tube socket center hole for star ground
  73. Heathkit UA-2 clone project
  74. Schematic CAD Program
  75. Latest on the RH amps..
  76. Transformer design program
  77. 807 "Musicians Amplifier" help
  78. J.E. LABS PP2A3 POWER SUPPLY ?
  79. Mono Block Building Project
  80. EL34 CCS ideas
  81. Magnavox 8601-20
  82. wood/metal vs all-metal chassis
  83. Design data on dry battery tubes
  84. Differential tube with a gain stage 1178
  85. 6C4C tube ...Good to buy ?
  86. Including a C- winding on a filament transformer
  87. CINEMAG 15B TRANSFORMERS balanced>unbalanced
  88. Rebuilt Heathkit AA32 with hum on MAG PHONO input
  89. Electrolytic cap question
  90. Tube Socket ID
  91. JJ 5Y3S is too tall...need smaller tube
  92. Uniamp 2A3
  93. buzz noise from paraphase circuit
  94. Benefits of Enhanced Triode Connection
  95. Working out a valves load resistance?
  96. 813 Alternatives
  97. Help 6N6T pinout
  98. Very large parafeed cap
  99. Bright purple flash 6N1P
  100. Harman Kardon Citation II - rebuild questions
  101. Stoetkit junior mk2
  102. 1619 Push pull output stage
  103. Tube getter
  104. The sensation of the 21st Century. Galvanic SUPER HIGH END PP power for all types of
  105. Audible Illusions and 6922
  106. quick access tube amp protection
  107. Identifying Genalex KT66 matched pair question
  108. Hunting 100Hz noise in SRPP+ stage
  109. JJ ECC83S Biasing conditions
  110. Audiophiletalk - Dirt Cheap SE
  111. 12AL8 Head-Amp with UTC Output Transformer
  112. SET monoblocks?
  113. EL84 Push Pull design from left over parts
  114. Strange UL Transformers
  115. Stabilization balanced currents in the PP stage.
  116. Current mirror stage in PP
  117. EL34 SE ultralinear schematic
  118. Question: Acceptable DC current in push-pull output transformer due to tube mismatch?
  119. Toroid Power Transformer For GM-70 845 211 1000V
  120. Building the "Crystal Palace" Amp
  121. Improved Sound Card Interface - Ideas and Suggestions?
  122. Upgrading OPTs in production amp? (Yaquin MC-10L)
  123. any good Triode 6H8C preamp schematics out there???
  124. pushpull 6aq5 distortion
  125. Mr. Lian 845 SET more kit rather than commercial product.
  126. Opinion for otl ocl headphone amp
  127. Tube-newby wanting to make a good tube amp
  128. Anyone used a voltage tripler PS?
  129. Audioromy 828A / FU-29 tube layout
  130. Choosing Cathode Bypass Capacitor
  131. Ground loop gremlins
  132. Crackling Amp after Accident
  133. New CCS/ depletion mode MOSFETs available... experience anyone?
  134. Mengyue Mini
  135. Parafeed quest
  136. Determining linearity - differential gain stage
  137. 6HB6 - Any pratical experience?
  138. 27 Tube Preamp design questions
  139. Output Transformers Mount Position
  140. Critique please: Fixed bias 7591 SE
  141. Coupling Cap Improvements?
  142. RL 12T 15
  143. Tube instead of anode resistor
  144. HELP!! Terrible 50Hz hum in Mullard 10W DIY amp
  145. My New 45 SET (choke-loaded 6SN7, direct-coupled)
  146. Hf31 fidelity valve type
  147. Design of transformers for valve amplifiers.Part2
  148. Harman Kardon ta5000X alignment/manual
  149. Help with an analog meter hack
  150. dirkwright phono
  151. Zener Voltage Regulator
  152. Fisher X-101-B Substitute for 7591
  153. UNU-pnono riaa mm preamp
  154. My old amps
  155. Switching regulator on Kickstarter
  156. my yaqin 100b will not bias on v1 v3
  157. Zenith model B835R
  158. Want to build 2a3 amp for old radio
  159. Preamp Advice
  160. simple 5687 pre amp help
  161. Pulling TV From 61 Maggie Imperial Console?
  162. I can buy some 6U9's cheap - are they any good, and what could I build?
  163. K8011/K8010 PCB build thread
  164. Choosing an op point when using a tube 'off label'
  165. Choke inputs
  166. Unbalanced In > Balanced Out line amp - How To Do It?
  167. 6146b output transformer. I'm new and I need help.
  168. Your first DiY Low Cost/Low Voltage tube AMP
  169. Need some advice on OPT for kt88/6l6
  170. 1:1:1 transformers
  171. Output transformer in the cathode?
  172. Popping DC
  173. Power transformer wiring issues
  174. easy question - Magnavox 86-01 owners...
  175. Mic preamp input transformer alternative?
  176. What's the Best Way to Reduce Gain in a Preamp
  177. safety with high voltage input capacitor ?
  178. SE EL84 amp - reducing 100Hz hum
  179. Photos of large DHT preamps? (Or large amps in general)
  180. Minimum pin length (noval)
  181. Biasing of KT120
  182. SE to balanced transformer
  183. Decoupling Cap value - How Much?
  184. Cathode bypass Cap vs. No Bypass Cap
  185. Interesting circuit I thought.
  186. Yet another K12G thread
  187. 6N3 tube preamp question
  188. Driver vs Power tube
  189. Help in Bias tube amp for Adis Devy 7
  190. Tubes and HT
  191. HiFiMan EF-2A schematic sought
  192. Please, help with a WE91 project on behalf of a friend
  193. Proposed Headphone Amp Overhaul?
  194. protection of downstream line amp
  195. Is the 6E6P suitable for audio?
  196. me clone proto EL/PL 504
  197. Improving headphone amplifier
  198. 5902 LSTPICE Model
  199. Canary CA-301 PSU
  200. 3B28 oscilator
  201. A lot of schematics
  202. V8 amp
  203. market by Jac music
  204. 6P3C-1 SE ? .
  205. Cary slp70: Worth to upgrade?
  206. Hickok 123B tube tester
  207. Adding NFB makes headphone amp sound AWFUL!!!
  208. Filaments hard wired to B+ on EZ81 base
  209. What the bird is OS 18/600?
  210. ccs 10m90s what is wrong?
  211. Topology for balanced preamp
  212. 6v6 vs. 6l6 vs. 807 soundwise..
  213. Opinions/Advice on Triode Strap method
  214. Something like a Miniwatt N3 or APPJ PA0901A
  215. Extraordinary harmonics. Type 47 # tube amp.
  216. Made a new tube amp, 6J5 +27 +45
  217. Anyone ever play around with a GU-72?
  218. Possibility of using a UTC LMI-500 transformer...
  219. Aikido transformer
  220. Can someone explain why you need to re-adjust the balance on a tube amp every time
  221. Which factory made these tubes ?
  222. 813 and gm70
  223. 13E1 Push Pull
  224. dump find.
  225. ...6SN7GT operating points tube help.......
  226. 6L6 6SJ7 Amp please pick faults if any
  227. Updated DIY EL34B 6SJ7 SE Amp
  228. 6C18 x 6C33
  229. Vintage tube amp find
  230. any benefit to screen-grid drive a 6V6?
  231. Brown face Scott LK72
  232. Pilot 1060 integrated - make it better!
  233. Should I ground my K12G or my Bugle 2?
  234. 6c33 amp convert to 6c41
  235. STA-LEVEL thumbs problem
  236. Amp motorboating at power up
  237. Spice models for AL4 and RS242 tubes
  238. Mains Switch
  239. Suggestions for big output stage needed
  240. Very Good (or best?) 12B4 schematic?
  241. Amplifier for active bookshelf speakers
  242. Olson AM-240 schematic needed
  243. Valve amp - maintenance
  244. Your opinion about Rotel 930AX to hyrbid mod
  245. Weston Tube Tester 774-5
  246. Tube circuit sim software for free?
  247. 6v6 family tubes
  248. Troublesome bias resistor, cathodyne stage
  249. 6AQ5 excellent for line stage?
  250. Datasheet 6P42s and 6P45C

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