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  1. Question on building my first tube preamp power supply
  2. 6SN7 preamp advice
  3. Sy, ever have any LED current hogging with RLD?
  4. Opinion on schematic
  5. Zenith 5G29 Tone Controls
  6. Problem - SE Class A with toroidal OT ?
  7. Please recommend a valve are-amp kit
  8. Stressed Poseidon board?
  9. Yaqin MC-10L biasing current
  10. smelly tube amp
  11. Choosing OT for triode stage
  12. Dual mono power supply/single driver tube wiring
  13. 12DW7 (actually 4HC7) preamp ideas?
  14. 26 Linestage Without ICs
  15. Transmitter Rectifier vs. TV Damper
  16. Single stage push pulll?
  17. Tube Adapters
  18. Audio Research D150
  19. need advice on presto 3 channel mixer power supply
  20. Am i at the right track? Will this work?
  21. Sanity check RQ for new amp build
  22. P-P 8236s
  23. What about a pass band feedback in SET amplifier
  24. New amp design: PL-177 single-ended
  25. SSRP amp Gain control pot placement.
  26. Help with Budget SET amp for Klipsch Cornwalls
  27. used all tubes in Yaqin
  28. Dukane 1A775 amps?
  29. What project?
  30. What output transformers ?
  31. Aikido SE driver
  32. P-P Load Resistance vs AB1 vs AB2
  33. Will an oversize output transformer improve the sound? Wright PP2C amp.
  34. EL84 Amp Question
  35. Tube Preamp
  36. What are the limits for a 500va variac?
  37. Rogue audio tempest ii scary sounds behaviour
  38. Help me understand Allen Wright balanced amp input, please!
  39. Philips 4C35 and Valvo 5C22 radioactivity?
  40. Need expertise for my first project, 6SN7-6SJ7-6V6
  41. Music angel minix3
  42. VTL tt25
  43. Seek advice on tranformer usage
  44. Counterpoint SA 5.1 Hum Problem.
  45. Tube manufacturers... all you need to know
  46. Optimizing twisted pairs for heaters and other AC wires
  47. Modeling Piezo
  48. RCA hum cancelling OPT feedback
  49. volume control location
  50. ST70 EL34 PPP?
  51. ISO fc-30-3.5 transformer
  52. Trying to understand 12ax7 stages in this baxandall type circuit
  53. 6KV6A
  54. Soliciting advice for my first design (push-pull 6973)
  55. ISO: Scott 272 Schematic (Not on the web)
  56. Direct-Coupled Amplifier with Cathode Follower by R. H. Bates
  57. Regulated ST-70 Output Stage
  58. Zenith K731 Knob Removal
  59. Stereo Class A monoblock smoothing cap grounds
  60. Transformer Taking a Fall
  61. Welborne Labs Manuals are now available online
  62. Transformer coupled cathode follower power?
  63. The BSTRD - Class A Tube Pre and PSU with Eagle Project Files
  64. GE ECC88/6DJ8
  65. Rogue Audio M120 magnums schematics
  66. RCA Receiving Tube Manual
  67. 300B SET Integrated Amp
  68. Help needed - screen regulation (mosfet/zeners) for Eico ST-70
  69. Active Bax Preamp - review request
  70. help to find the diagram Fisher PR-66 phono preamp
  71. KT120 SET build
  72. Repair on potted transformer
  73. EL34 SE Build
  74. Tube Tester in Ohio
  75. Melody SP3 Tube Replacement and Bias Assistance
  76. 12AU7, zeroing in on operating points and circuits to minimize noise and distortion.
  77. Shuguang EL34-B
  78. space charge tube preamp
  79. RS-177F Tube Amp Rebuild
  80. 12SC7 as a phase splitter?
  81. Understanding load lines
  82. Quad 22 tone control
  83. KBD - Kick Back Diode
  84. Suggestions needed for troubleshooting Eico ST-70
  85. Berning EA-2100 Distortion- Why?
  86. Parallel Tube Rectifier Diodes
  87. Pete's DCPP - pre-build questions
  88. Service manual for Counterpoint NPS 200
  89. WAD KLP1 preamp
  90. Finishing a C3M-300B
  91. Recommendations For Which Aikido Line Stage?
  92. Transcendent Sound T16 OTL Amp Schematic ?
  93. Jolida JD3000A mono
  94. Nouveau Ancien
  95. Sharing completed newbie build KT88 Williamson
  96. GE ECC88 fake or real?
  97. KT88 Build By Total Newbie
  98. Have real problem SMPS
  99. Precision Fidelity C8 pre
  100. Hammond or Edcor transformer
  101. Tube amp for Wilson Audio wp
  102. RH84 CCS Problem?
  103. 5GH8A
  104. 6l6GC schematic amp
  105. Locating materials to wind my own output transformers
  106. Desktop Tube Amp Suggestion
  107. any one can verify this label ?
  108. Weird failure with cheap Shugang KT88
  109. Amplifier opinions
  110. Is it common to have different gain in same envelope?
  111. 6L6GC-EH re-visit
  112. 6n6p advice
  113. Help with a valve amp setup (1/4 inch jack out)
  114. 6CB5 Plate Load
  115. A good cheap power amp for a Dyna PAS 3X ?
  116. What Does 1/2 mean in a 1/2 6N1P Tube?
  117. Preamp Servo Filter
  118. Lowest V at which damper diode tubes work
  119. My 1st tube amp build thread (and lots of questions)
  120. Filament power switch.
  121. HV Shunt Regulator - Advice needed
  122. how much space for cooling a tube amp?
  123. 7716 Tube Data
  124. Current sense cathode resistor blow up
  125. Resistor ratings for a small tube circuit?
  126. power tube for 6SN7 for 10 6SN7 in parallel psu
  127. Recommend an ECL82 SE Schematic?
  128. Rose RV-23 preamp valves. 4xECC82, or 2xECC82 + 2xECC83?
  129. rogue audio bias selector knob help
  130. Help a Solid State idiot
  131. Problem With 01A Preamp (Losing Rectifiers)
  132. Do your very worst
  133. Small hum in Transcendent Sound phono clone
  134. Shuguang Treasure CV181-Z Review
  135. Question about type 52 tube
  136. Angela 91 300B Monoblocks with 6C6 Pentode-
  137. Audioromy M828A > peep
  138. Need suggestions for CCS and parallel feed OT implementation
  139. Transcendent Sound Ground Grid
  140. Issue with 211 amplifier
  141. Questions about tetrodes for specialists
  142. Fisher X100-C amp restoration help please
  143. Noise from Ceramic Coupling Capacitors?
  144. PX4 SET amp Project
  145. valve
  146. What about adding a slight "presence" boost RC network fixed in the amplifier.
  147. Needing OT for SE ECL82/6BM8 amplfier
  148. 6X4 negative cathode voltage schem needed
  149. 300B 5V DC filament supply from 5V AC windings
  150. KR Audio Marconi R Valve linestage help
  151. How to calculate current rating of choke?
  152. Hum when ground connected
  153. Western Electric 142A Capacitors - Need advice
  154. Need help for ECL86 SE amp feedback
  155. Newbie wanting to replace a power transformer
  156. Tube Design Idea (Lifespan Extension)
  157. Almost All DHT System Advice
  158. Suggestions needed on buying 7868 tubes
  159. Question
  160. Treble circuit in Tone Control
  161. Quadrature/Coincidence FM Demodulation
  162. Headphones on Trancendent Grounded Grid preamp.
  163. 6sn7/300b
  164. Right channel too quiet in stereo console
  165. White cathode follower analysis and design
  166. SP14
  167. 6BQ5 triode driver stage operating point
  168. Did I draw this parafeed correctly???
  169. AutoBIAS (tentlabs) module
  170. PP 300b project (3 stage)
  171. Ideal THD vs Frequency for SET
  172. DigiBIAS incl. delay
  173. 6U8 input stage question
  174. PP amp E88CC - 6N8S - 6GB8
  175. Strange 45 behavior, Gas?
  176. PP UL amp: ECC83 + 6SN7 + KT88
  177. Simple trick to change UL from 40% to 60% ?!
  178. JJ 12AY7 for EL34 SE ?
  179. IT stage microphony
  180. first amplifier question
  181. 5687 tube 6.3VDC heater pins connection
  182. Preamp Power Supply - HV, filament & chassis earth - question
  183. Hybrid with a difference?
  184. Need Schematic for 6C5 Linestage
  185. KT88 PS Caps?
  186. Jolida 102B ALPS RK27 Install Tricks
  187. Yet another CCS
  188. Heater cathode potential
  189. Preamp HV and coupling cap question
  190. I am looking for the circuit from a tube amp (description and photo attached)
  191. Tube surround sound/hafler home theater build
  192. Looking at more preamps........
  193. Help me to improve my 6n6p/El34 UL...CCS/AnodeChoke/Transformer ?
  194. Darkvoice 336 tubes
  195. GU-50 opt in europe
  196. OPT on Ebay, any one know or use this?
  197. VTA M-125 mono block kit.
  198. 6V6 Regulator Issue
  199. Tube phono stage build
  200. First valve amplifier, tunings!
  201. Looking for 7N7 preamp schematic
  202. Line Magnetic LM-216 -- Annoying Hum
  203. Anthem Pre2L Special Edition...tubes?
  204. 6550 tube compatibles?
  205. Dynaco VTA ST-120.
  206. Tube amp help
  207. Transmitting tubes eg; 805 datasheet, Rp, gm, mu?
  208. 300b selectable ac or dc filament supply?
  209. Russian 6J43P-E(6Ж43ПE) Dual anode pentode....
  210. suitable 1:2 opt for a headphone amp
  211. Primary impedance, which tube?
  212. Dual-control, sharp-cutoff pentode
  213. Big transformer for little project?
  214. Entry in to DIY Tube world with 300B SET Kit
  215. Dynaco ST-70, Original or Mod?
  216. Damper diode as delay
  217. Thoughts on this design......
  218. Output Transformer Question
  219. Feedback on Andrea Ciuffoli's Extreme Hi-End Hybrid Amplifier
  220. Help troubleshooting oscillation
  221. Audio Research VS110
  222. Re-activate getter/save gassy tube
  223. What does 40% screen tap mean for UL OPT?
  224. Which pentode mode is this?
  225. ST-70 Power supply questions
  226. 3 stage DC - any thoughts?
  227. Help to choose the right EL34 schematic
  228. Russian tubes - Classification of various brands?
  229. hot bias- actually hot?
  230. POT between EAR834 phono and power amp
  231. Matching 100 tubes ECC803S
  232. EL34 Single-ended Class A tube amplifier KIT
  233. Help to de-bug a 6AH9/mosfet concertina driver
  234. More Ruminations on Screen Drive/Crazy Drive
  235. How is this possible??
  236. 10k power tube load
  237. Phonola Record Player TK 2146
  238. Anode Bootstrapping
  239. basic line stage testing
  240. Question about power transformer choice.
  241. Separating power supply with SET amps
  242. Weird EL84 and 6p14p-k tubes
  243. genuine 6P14P-EB?
  244. Power Transformer for OTL Headphone Amp
  245. Magnetic relay to drive with small-signal tube
  246. rj6 coaxial cable to wire the input connections to the input/driver tubes?
  247. Noob question: one channel is dead; safe to swap tubes to troubleshoot?
  248. Little 6BQ5 am squealing....HELP
  249. output trans for input trans
  250. Emulating Ultra Linear Mode

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