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  1. Extra power,higher DF,lower distortion from SE pentodes
  2. Looking for the best SQ Phono LCR schematic
  3. Completed 300B-C3M SET (pictures)
  4. 12av5ga variations!
  5. Replacing caps in signal path - 300B SET
  6. New 45/2A3 amp power supply question
  7. Power tubes won't bias properly
  8. Balanced active tone control
  9. Modifying a Schema - 832A
  10. Dynamic ST-500 el84 amp
  11. James Audio JS-6113HS vs 6113H
  12. Scott 299c restoration help
  13. Advice for Vu meter
  14. Dual supply for plate current, grounding?
  15. Is output tube cathode bypass mandatory in stereo amps?
  16. Choose tube for opt headphone amp
  17. Advice on improving this headphone amp design
  18. Small signal diode for 12AX7 bias
  19. HK A500 rebuild issues
  20. 50W monoblock "Engineers Amp"
  21. GU32 Push Pull amplifier Troubleshooting
  22. First tube amplifier build suggestions
  23. 55V DC at output of CAP in cathode follower
  24. Wiring a multi filament transformer?
  25. Direct driving a 300b
  26. Tampa Bay Area HELP!!!!!
  27. My 6E5P amps (SPUD)
  28. Is this a good phono preamp circuit to build?
  29. Parallel SE amp question
  30. Sharing Meter with Switch
  31. Elevating heaters in separate channels together
  32. 6DJ8 hybrid headphone amp
  33. cascode distortion Spectrum.
  34. voltmeter causes errata on scope when touching plate of V1
  35. Opto to bias triode?
  36. 6ж52п 6Z52P triode curves anyone?
  37. 815 tube in PSE
  38. Stromberg ASR-880 Biasing
  39. 6FM7 pp amp
  40. Power transformer general question
  41. Needs new 845 tubes for SET AMP
  42. Output voltage query
  43. 6BF6 Possibilities?
  44. using "wrong" primary PT
  45. Audio Innovations 500 output transformer
  46. Figuring out Heathkit T-4 OPT 51-31 turns ratio and repurpose
  47. Ask the dust ... an amp with the mighty 801A
  48. SE with low distorsion
  49. Zenith 7D31 / Magnavox 9300 amp - Thoughts and questions
  50. A300 6L6/6V6 modified Harmon Kardan A300 (XAM)
  51. Hi End Tube Amp Kit
  52. Cathode follower interstage power amp
  53. Roberts preamp & APH 1100
  54. Newbie looking for DIY Tube Pre-Amp Kit
  55. Switching of B+ and HT to lesser-used phono stage
  56. Picking operating voltage for a 5814/12AU7
  57. A well Engineered amplifier
  58. SRPP vs. transformer ratio
  59. Mosfet concertina - a better, more simple to design power amp?
  60. Current draw of different wiring/tap alternatives
  61. Which EL34/KT88 PP projects should I consider?
  62. Matching KT 88 Tubes?
  63. Hifiandaudio.com
  64. Pentode as inverted triode
  65. 300B in a EL34 PP amp via adaptor possible ?
  66. KT88 SE advice sought
  67. male42 RIAA Preamp Discussion
  68. Please advise a few decent EL34 P-P OPT.
  69. Tube swapping questions
  70. Integrated Tube Amp with tube Phono Pre-Amp
  71. EL34 PP Amplifier - would like some advice about two designs
  72. What preamp tube for a 2.5K/600 ohm OPT
  73. Question on building my first tube preamp power supply
  74. 6SN7 preamp advice
  75. Sy, ever have any LED current hogging with RLD?
  76. Opinion on schematic
  77. Zenith 5G29 Tone Controls
  78. Problem - SE Class A with toroidal OT ?
  79. Please recommend a valve are-amp kit
  80. Stressed Poseidon board?
  81. Yaqin MC-10L biasing current
  82. smelly tube amp
  83. Choosing OT for triode stage
  84. Dual mono power supply/single driver tube wiring
  85. 12DW7 (actually 4HC7) preamp ideas?
  86. 26 Linestage Without ICs
  87. Transmitter Rectifier vs. TV Damper
  88. Single stage push pulll?
  89. Tube Adapters
  90. Audio Research D150
  91. need advice on presto 3 channel mixer power supply
  92. Am i at the right track? Will this work?
  93. Sanity check RQ for new amp build
  94. P-P 8236s
  95. What about a pass band feedback in SET amplifier
  96. New amp design: PL-177 single-ended
  97. SSRP amp Gain control pot placement.
  98. Help with Budget SET amp for Klipsch Cornwalls
  99. used all tubes in Yaqin
  100. Dukane 1A775 amps?
  101. What project?
  102. What output transformers ?
  103. Aikido SE driver
  104. P-P Load Resistance vs AB1 vs AB2
  105. Will an oversize output transformer improve the sound? Wright PP2C amp.
  106. EL84 Amp Question
  107. Tube Preamp
  108. What are the limits for a 500va variac?
  109. Rogue audio tempest ii scary sounds behaviour
  110. Help me understand Allen Wright balanced amp input, please!
  111. Philips 4C35 and Valvo 5C22 radioactivity?
  112. Need expertise for my first project, 6SN7-6SJ7-6V6
  113. Music angel minix3
  114. VTL tt25
  115. Seek advice on tranformer usage
  116. Counterpoint SA 5.1 Hum Problem.
  117. Tube manufacturers... all you need to know
  118. Optimizing twisted pairs for heaters and other AC wires
  119. Modeling Piezo
  120. RCA hum cancelling OPT feedback
  121. volume control location
  122. ST70 EL34 PPP?
  123. ISO fc-30-3.5 transformer
  124. Trying to understand 12ax7 stages in this baxandall type circuit
  125. 6KV6A
  126. Soliciting advice for my first design (push-pull 6973)
  127. ISO: Scott 272 Schematic (Not on the web)
  128. Direct-Coupled Amplifier with Cathode Follower by R. H. Bates
  129. Regulated ST-70 Output Stage
  130. Zenith K731 Knob Removal
  131. Stereo Class A monoblock smoothing cap grounds
  132. Transformer Taking a Fall
  133. Welborne Labs Manuals are now available online
  134. Transformer coupled cathode follower power?
  135. The BSTRD - Class A Tube Pre and PSU with Eagle Project Files
  136. GE ECC88/6DJ8
  137. Rogue Audio M120 magnums schematics
  138. RCA Receiving Tube Manual
  139. 300B SET Integrated Amp
  140. Help needed - screen regulation (mosfet/zeners) for Eico ST-70
  141. Active Bax Preamp - review request
  142. help to find the diagram Fisher PR-66 phono preamp
  143. KT120 SET build
  144. Repair on potted transformer
  145. EL34 SE Build
  146. Tube Tester in Ohio
  147. Melody SP3 Tube Replacement and Bias Assistance
  148. 12AU7, zeroing in on operating points and circuits to minimize noise and distortion.
  149. Shuguang EL34-B
  150. space charge tube preamp
  151. RS-177F Tube Amp Rebuild
  152. 12SC7 as a phase splitter?
  153. Understanding load lines
  154. Quad 22 tone control
  155. KBD - Kick Back Diode
  156. Suggestions needed for troubleshooting Eico ST-70
  157. Berning EA-2100 Distortion- Why?
  158. Parallel Tube Rectifier Diodes
  159. Pete's DCPP - pre-build questions
  160. Service manual for Counterpoint NPS 200
  161. WAD KLP1 preamp
  162. Finishing a C3M-300B
  163. Recommendations For Which Aikido Line Stage?
  164. Transcendent Sound T16 OTL Amp Schematic ?
  165. Jolida JD3000A mono
  166. Nouveau Ancien
  167. Sharing completed newbie build KT88 Williamson
  168. GE ECC88 fake or real?
  169. KT88 Build By Total Newbie
  170. Have real problem SMPS
  171. Precision Fidelity C8 pre
  172. Hammond or Edcor transformer
  173. Tube amp for Wilson Audio wp
  174. RH84 CCS Problem?
  175. 5GH8A
  176. 6l6GC schematic amp
  177. Locating materials to wind my own output transformers
  178. Desktop Tube Amp Suggestion
  179. any one can verify this label ?
  180. Weird failure with cheap Shugang KT88
  181. Amplifier opinions
  182. Is it common to have different gain in same envelope?
  183. 6L6GC-EH re-visit
  184. 6n6p advice
  185. Help with a valve amp setup (1/4 inch jack out)
  186. 6CB5 Plate Load
  187. A good cheap power amp for a Dyna PAS 3X ?
  188. What Does 1/2 mean in a 1/2 6N1P Tube?
  189. Preamp Servo Filter
  190. Lowest V at which damper diode tubes work
  191. My 1st tube amp build thread (and lots of questions)
  192. Filament power switch.
  193. HV Shunt Regulator - Advice needed
  194. how much space for cooling a tube amp?
  195. 7716 Tube Data
  196. Current sense cathode resistor blow up
  197. Resistor ratings for a small tube circuit?
  198. power tube for 6SN7 for 10 6SN7 in parallel psu
  199. Recommend an ECL82 SE Schematic?
  200. Rose RV-23 preamp valves. 4xECC82, or 2xECC82 + 2xECC83?
  201. rogue audio bias selector knob help
  202. Help a Solid State idiot
  203. Problem With 01A Preamp (Losing Rectifiers)
  204. Do your very worst
  205. Small hum in Transcendent Sound phono clone
  206. Shuguang Treasure CV181-Z Review
  207. Question about type 52 tube
  208. Angela 91 300B Monoblocks with 6C6 Pentode-
  209. Audioromy M828A > peep
  210. Need suggestions for CCS and parallel feed OT implementation
  211. Transcendent Sound Ground Grid
  212. Issue with 211 amplifier
  213. Questions about tetrodes for specialists
  214. Fisher X100-C amp restoration help please
  215. Noise from Ceramic Coupling Capacitors?
  216. PX4 SET amp Project
  217. valve
  218. What about adding a slight "presence" boost RC network fixed in the amplifier.
  219. Needing OT for SE ECL82/6BM8 amplfier
  220. 6X4 negative cathode voltage schem needed
  221. 300B 5V DC filament supply from 5V AC windings
  222. KR Audio Marconi R Valve linestage help
  223. How to calculate current rating of choke?
  224. Hum when ground connected
  225. Western Electric 142A Capacitors - Need advice
  226. Need help for ECL86 SE amp feedback
  227. Newbie wanting to replace a power transformer
  228. Tube Design Idea (Lifespan Extension)
  229. Almost All DHT System Advice
  230. Suggestions needed on buying 7868 tubes
  231. Question
  232. Treble circuit in Tone Control
  233. Quadrature/Coincidence FM Demodulation
  234. Headphones on Trancendent Grounded Grid preamp.
  235. 6sn7/300b
  236. Right channel too quiet in stereo console
  237. White cathode follower analysis and design
  238. SP14
  239. 6BQ5 triode driver stage operating point
  240. Did I draw this parafeed correctly???
  241. AutoBIAS (tentlabs) module
  242. PP 300b project (3 stage)
  243. Ideal THD vs Frequency for SET
  244. DigiBIAS incl. delay
  245. 6U8 input stage question
  246. PP amp E88CC - 6N8S - 6GB8
  247. Strange 45 behavior, Gas?
  248. PP UL amp: ECC83 + 6SN7 + KT88
  249. Simple trick to change UL from 40% to 60% ?!
  250. JJ 12AY7 for EL34 SE ?

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