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  1. ECC40 Voltage Question
  2. Question re DC coupling vs RC coupling (AC)
  3. Measuring ripple in filament supply (coleman reg)
  4. What about use largest possible capacitor as interstage decoupling ( 1 or 2uf)
  5. replace 6N3 tube preamp with mullard E555L
  6. Preamp to Poweramp tube proximity/spacing?
  7. List of Tube Noise Measurements - please nominate lowest noise tubes
  8. Just for interest
  9. Time to build the big one.
  10. Opinion? Would the input/driver from a HK-5 be good to replace original Mk3 ft. end??
  11. Has anyone built this kit?
  12. mu-follower with output transformer?
  13. ECC81 double triode tubes flashed brightly when switched on.
  14. pre amp with tone controll
  15. Making own hifi tube amp from scratch!!
  16. Pentode CCS as a load for long tailed pair?
  17. E88CC & 6N23P plate voltage range?
  18. First pre phono design [newbie]
  19. Struggling with LTspice - How to use .inc to get a tube to appear
  20. Eico St 40
  21. ECC88 Input/driverstage for F4 amp
  22. Tube headphone amp
  23. Acquired free brand new Jolida 302a
  24. Help with restoration of Audio Research equipment
  25. Grommes 103gt tuner
  26. Frank’s 6SN7 pre & regulated supply
  27. Sleeping giant
  28. hum by mounting powertransformer and tubes on same chassis
  29. Rectifier tube overheating
  30. "World's Best Technical Master Craftsmen"
  31. OPT for 2A3
  32. getting rid of pre amp in a tube amp
  33. A question on OPT and no loads.
  34. Auto-Bias vs Manual bias vs EFB
  35. Russian receiving tubes and foreign equivalents
  36. B+ delay timer module
  37. Testing DIY triodes
  38. Adding a dummy load to prevent amp from being damaged by having no load?
  39. 30 watt class A chopper controlled bias with 6 EL84
  40. Input resistor (What are purposes?)
  41. Posted new 300B push-pull amp design
  42. Help me source a pair of OPT for Knight KG-240 tube amp
  43. Help Pick Transformers for EICO HF-87
  44. PreAmp
  45. Original price of the Conrad Johnson PV-5
  46. balance pots in Williamson driver stage
  47. Another Question on Tektronix Transformers
  48. Philco K1629 Upgrade Options
  49. My return to tubes, via headphones - what circuit would you recommend?
  50. High Quality EL84 UL SE Amplifier
  51. regulated supply to CCS plate load
  52. Twin Audio Sinfonia Preamp
  53. ecll800 schematic confusion
  54. 6L6 recommendations
  55. tube 100th
  56. Luxman OY15-5k OPT?
  57. Has anyone had experience with Russian 5C8S and 5C9S?
  58. New Here looking for info on rare SVIKO russian made 6KG6 monoblocks
  59. EL 84 pp amp - simple regulated circuit sought
  60. Any tube amp to drive B&W 802D?
  61. New to valve amplifiers
  62. SE 6GW8 output transformer with 5 wires.
  63. Mr.Curwen's single ended adventures
  64. Tube magic eye with em84-sensitivity?!
  65. Tube test
  66. Brimar 6V6 USSR
  67. World Design KT88 Kit
  68. Opinions appreciated: Lafayette LA 224b vs. McIntosh 225
  69. Clone X10D problems distortion / saturation ... help!
  70. 12DW7 or 12AU7+12AX7 if stereo?
  71. First preamp and gain control
  72. Tube life..
  73. Berman 76 preamplifier, I need some advice please
  74. Old Tube amp missing tubes. HELP
  75. Going to Berlin, looking for electronics diy shops
  76. 6SJ7 Vs 6Ж8 - Can the russian tube be considered an equivalent tube ?
  77. 6L6G Tung-Sol reissue: sweet sound and delicious night sight, but...
  78. Help with Eico ST70
  79. Class-D and Tube buffer/preamp off same 12V SLA?
  80. Gu50 or 1624 PP amp first trials
  81. cathode follower driver A2
  82. High Pass Filter for OTL headphone Amp
  83. Bewitch 6550 Balance Issue
  84. ground hum issues in an old peak st-100
  85. Need an APPJ PA0901A Mini Amp Output Transformer.
  86. VTL Tiny Triode Schematics?
  87. A question of dynamics: Amplifier design?
  88. Rechargeable battery for cathode bias: open discussion
  89. High quality tube socket for 4P1L tube ?
  90. VTL Schematic needed
  91. Diode rating for filament voltage doubler
  92. SE vs PP for SET amps
  93. Use "mu output" from depletion mode MOSFET load?
  94. GM70 SE mov rectifiers
  95. First Preamp build
  96. Fisher KX-200 driving a pair of ESL from the plates
  97. Disadvantages of unbalanced tube
  98. The anatomy of a vacuum toob
  99. Valve Amplification Company CLA1 mkii help
  100. leak stereo 20 channel imbalance
  101. Mains powered 20W submin bridge amp
  102. SS rectification ST70
  103. K-12g ultra fast diode mod UF4007
  104. WE46c..
  105. 10 Pin B10A socket
  106. RIAA network adjustment
  107. audio research sp16
  108. Visiting Japan
  109. "up-rating" power filter chokes
  110. Differential pair gain/ where to apply feedback
  111. EL84 ECC83 SE Amp schematic
  112. high B+ voltage drop
  113. Volume control chip
  114. Signal Ground
  115. New to 6DJ8 tube
  116. EL91 Max ratings ? help
  117. I need a distraction!
  118. 300B amp project
  119. "bevois valley" in triode
  120. Strange problem wit a 3 tube preamplifier
  121. JJ Tesla vs. Electro Harmonix for Hi-Fi EL84 SE?
  122. This Tube CB make
  123. tubecad el84 powersupply ps4 question
  124. ART Tube MP studio V3 problems
  125. Calculating Cathode Bias w/o tube curves?
  126. Cathode follower PA Driver in a cathode biased amp
  127. I have my first Valve Amp, help me not blow it up!
  128. Unison Research SR-1 schematic/service manual
  129. Mega Tube DIY project
  130. very very simple single ended 300b valve amp schematic?
  131. 300b with single stage driver, c3m or?
  132. Cap upgrade for SVP RIAA stage
  133. Quick Q about JC's upside down front end.
  134. Bogen beasts again
  135. I thought this was a joke...but..
  136. Black pollution
  137. Difference between 6N1P and 6N23P?
  138. low voltage AC umbilical advice
  139. RCA MI-4288J Amplifier - Any info?
  140. 3.5k OPT for 45 type tube?
  141. DIY/OOTB upgrade? PP/SE?
  142. Sansui AU70
  143. Moody 496 Schematic Wanted
  144. Center-tapped Plate Choke vs. OPT for PP plate loads
  145. Help sourcing some resistors with very special values for a project
  146. Power Transformer Rating?
  147. KT120 x 4 / 240W Push Pull TUBE AMP MONOBLOCKS
  148. How Much Wiring??
  149. Schematic request for Meixing Mingda MC-211
  150. 300B SE with an interstage
  151. 211/845 tubes in a 805 based amp ?
  152. Grid leak bias, how does it work?
  153. Melos Sha Gold Reference
  154. Tube Amp for MTM
  155. Dynaco ST-70 Series III
  156. #27 + 6N8S Mu-Follower: Vhk Max Question
  157. Counterpoint Sa-5000 and Klimo Kent - needed service manuals
  158. Drawing loadline using interstage / choosing interstage
  159. My New Iron for Single Ended 2a3
  160. GU-50 push pull amplifier
  161. 12SL7GT vs 12SN7GT
  162. DIY power amp and speakers
  163. KT88 SE
  164. Building a 6bq5 set amp
  165. OPT DC question
  166. Suitable speakers for a Leak Stereo 20
  167. Need advice on tube record player power jack.
  168. 12a_7 or 6SN7 phono preamp suggestions
  169. ECC99 as input stage for 300B?
  170. Drawbacks to over-speccing filament trannies?
  171. Thoughts on Western Electric amp redesign
  172. Adding choke to a power supply
  173. Broskie unbalancer and Aikido Help
  174. Mounting output tran and filter choke together
  175. Capacitors for tube amp rebuild
  176. Diving in, few questions
  177. SET Current Drop- Lack of Power, Saturation or Headroom?
  178. Power tubes: which is the maximum wire lenght for the cathode resistor to ground?
  179. Center Tapped Mains Transformer as Parafeed Plate Choke
  180. A tube newbie's review of the VTA ST-120
  181. Help Identifying Ebay Finds
  182. Led biasing or fixed biasing?
  183. diy vt-52 pushpull AMP
  184. Aikido Cathode Follower HUM Problem
  185. Superhet set HMV 438 Schematic help pls
  186. Output transformer for 100Hz and up
  187. Output transformers in series to simulate center-tap for push pull
  188. LED Biasing
  189. assembling a LITE LS-69 Hybrid Balance pre-amp
  190. Question about hifi power stage design
  191. Help with Magnavox EL84 Console restore
  192. Triode Loadline Simulator for dummies tutorial?
  193. Stromberg Carlson AP-54 schematic LTSPICE
  194. Resistor in series with S.E. O.T. ?
  195. Audio Valve Eklipse volume pot value?
  196. 47 driving 300B questions
  197. 6T9 Amp
  198. Eico HF-32 PEC Loudness Circuit
  199. MV-100B tubes running extremely hot
  200. PCL 86 parafeed?
  201. Hammond 370FX
  202. Question about tube in Little Bear P8 - 6N5P
  203. Mini Pentode tube testing in Triode mode?
  204. Sencore Pr57 Iso Trans, Power Conditioner for amp?
  205. Is hot bias really sonic preferable versus cold bias ?
  206. Aikido Problem - B+ dropping too much
  207. My S.E.T remade again - the DOS
  208. I need help to recognize these two vacuum tubes
  209. found a box...
  210. Advice on triode connecting a 'JZ6 tube
  211. Beard P100 pcb disassembly
  212. LM317 Heater 12ax7 ...not working
  213. 2A3 se amp power consumption
  214. "JJ" Tubes Vs other brands
  215. Need help with a preamp board I bought on eBay
  216. Question on Tube Rectifier..help please.
  217. 2A3 Hum Problems in SE (Please Help!)
  218. 240v to 110v for Sun Valley JB-300B
  219. SE output transformer
  220. single-ended.com annoyance
  221. A cheapo decent splitter
  222. Lightbulb Base Failure
  223. Madison Fielding Rcvr -- Filament Trick
  224. Converting from UL to Triode: Is this correct?
  225. white follower for driving mosfets.
  226. Distance between two audio input valves
  227. Series Caps on Power Supply
  228. Most expensive parts in DIY tube amp
  229. Filter Choke Selection
  230. 6072A as DAC outputstage
  231. adapting line level to suitcase record player
  232. Aikido Noval Stereo Questions
  233. 100K 2CH Volume pot recommendation
  234. Another Daft Idea
  235. Allen Model 75 user feedback needed
  236. My perfect 6550 PP amp :)
  237. Marantz 8b power transformer - open winding
  238. Chassis Grounding/ Comment on Chinese Schematic SRK-09
  239. Mini Carver Silver Seven?
  240. Using EL34 for allen wright's pp-2c
  241. Ampex 6973 mono blocks
  242. Antique Sound Lab AQ 2001 preamp issues
  243. Quad II hums
  244. Musical Fidelity XCAN V1
  245. Cathode Follower high power class B grid driver
  246. McIntosh MC 60 bias/voltage problem
  247. how to add a sub amp in parallel to S5-12G tube amplifier
  248. 5U4GB (rectifier) Arcing - What to think?
  249. I found these ripped pieces of paper..
  250. chassis grounding questions

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