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  1. Bewitch 6550 Balance Issue
  2. ground hum issues in an old peak st-100
  3. Need an APPJ PA0901A Mini Amp Output Transformer.
  4. VTL Tiny Triode Schematics?
  5. A question of dynamics: Amplifier design?
  6. Rechargeable battery for cathode bias: open discussion
  7. High quality tube socket for 4P1L tube ?
  8. VTL Schematic needed
  9. Diode rating for filament voltage doubler
  10. SE vs PP for SET amps
  11. Use "mu output" from depletion mode MOSFET load?
  12. GM70 SE mov rectifiers
  13. First Preamp build
  14. Fisher KX-200 driving a pair of ESL from the plates
  15. Disadvantages of unbalanced tube
  16. The anatomy of a vacuum toob
  17. Valve Amplification Company CLA1 mkii help
  18. leak stereo 20 channel imbalance
  19. Mains powered 20W submin bridge amp
  20. SS rectification ST70
  21. K-12g ultra fast diode mod UF4007
  22. WE46c..
  23. 10 Pin B10A socket
  24. RIAA network adjustment
  25. audio research sp16
  26. Visiting Japan
  27. "up-rating" power filter chokes
  28. Differential pair gain/ where to apply feedback
  29. EL84 ECC83 SE Amp schematic
  30. high B+ voltage drop
  31. Volume control chip
  32. Signal Ground
  33. New to 6DJ8 tube
  34. EL91 Max ratings ? help
  35. I need a distraction!
  36. 300B amp project
  37. "bevois valley" in triode
  38. Strange problem wit a 3 tube preamplifier
  39. JJ Tesla vs. Electro Harmonix for Hi-Fi EL84 SE?
  40. This Tube CB make
  41. tubecad el84 powersupply ps4 question
  42. ART Tube MP studio V3 problems
  43. Calculating Cathode Bias w/o tube curves?
  44. Cathode follower PA Driver in a cathode biased amp
  45. I have my first Valve Amp, help me not blow it up!
  46. Unison Research SR-1 schematic/service manual
  47. Mega Tube DIY project
  48. very very simple single ended 300b valve amp schematic?
  49. 300b with single stage driver, c3m or?
  50. Cap upgrade for SVP RIAA stage
  51. Quick Q about JC's upside down front end.
  52. Bogen beasts again
  53. I thought this was a joke...but..
  54. Black pollution
  55. Difference between 6N1P and 6N23P?
  56. low voltage AC umbilical advice
  57. RCA MI-4288J Amplifier - Any info?
  58. 3.5k OPT for 45 type tube?
  59. DIY/OOTB upgrade? PP/SE?
  60. Sansui AU70
  61. Moody 496 Schematic Wanted
  62. Center-tapped Plate Choke vs. OPT for PP plate loads
  63. Help sourcing some resistors with very special values for a project
  64. Power Transformer Rating?
  65. KT120 x 4 / 240W Push Pull TUBE AMP MONOBLOCKS
  66. How Much Wiring??
  67. Schematic request for Meixing Mingda MC-211
  68. 300B SE with an interstage
  69. 211/845 tubes in a 805 based amp ?
  70. Grid leak bias, how does it work?
  71. Melos Sha Gold Reference
  72. Tube Amp for MTM
  73. Dynaco ST-70 Series III
  74. #27 + 6N8S Mu-Follower: Vhk Max Question
  75. Tube Mic preamp with compressor - any ideas?
  76. Counterpoint Sa-5000 and Klimo Kent - needed service manuals
  77. Drawing loadline using interstage / choosing interstage
  78. My New Iron for Single Ended 2a3
  79. GU-50 push pull amplifier
  80. 12SL7GT vs 12SN7GT
  81. DIY power amp and speakers
  82. KT88 SE
  83. Building a 6bq5 set amp
  84. OPT DC question
  85. Suitable speakers for a Leak Stereo 20
  86. Need advice on tube record player power jack.
  87. 12a_7 or 6SN7 phono preamp suggestions
  88. ECC99 as input stage for 300B?
  89. Drawbacks to over-speccing filament trannies?
  90. Thoughts on Western Electric amp redesign
  91. Adding choke to a power supply
  92. Broskie unbalancer and Aikido Help
  93. Mounting output tran and filter choke together
  94. Capacitors for tube amp rebuild
  95. Diving in, few questions
  96. SET Current Drop- Lack of Power, Saturation or Headroom?
  97. Power tubes: which is the maximum wire lenght for the cathode resistor to ground?
  98. Center Tapped Mains Transformer as Parafeed Plate Choke
  99. A tube newbie's review of the VTA ST-120
  100. Help Identifying Ebay Finds
  101. Led biasing or fixed biasing?
  102. diy vt-52 pushpull AMP
  103. Aikido Cathode Follower HUM Problem
  104. Superhet set HMV 438 Schematic help pls
  105. Output transformer for 100Hz and up
  106. Output transformers in series to simulate center-tap for push pull
  107. LED Biasing
  108. assembling a LITE LS-69 Hybrid Balance pre-amp
  109. Question about hifi power stage design
  110. Help with Magnavox EL84 Console restore
  111. Triode Loadline Simulator for dummies tutorial?
  112. Stromberg Carlson AP-54 schematic LTSPICE
  113. Resistor in series with S.E. O.T. ?
  114. Audio Valve Eklipse volume pot value?
  115. 47 driving 300B questions
  116. 6T9 Amp
  117. Eico HF-32 PEC Loudness Circuit
  118. MV-100B tubes running extremely hot
  119. PCL 86 parafeed?
  120. Hammond 370FX
  121. Question about tube in Little Bear P8 - 6N5P
  122. Mini Pentode tube testing in Triode mode?
  123. Sencore Pr57 Iso Trans, Power Conditioner for amp?
  124. Is hot bias really sonic preferable versus cold bias ?
  125. Aikido Problem - B+ dropping too much
  126. Klemt Echolette M40 Schematic
  127. My S.E.T remade again - the DOS
  128. I need help to recognize these two vacuum tubes
  129. found a box...
  130. Advice on triode connecting a 'JZ6 tube
  131. Beard P100 pcb disassembly
  132. LM317 Heater 12ax7 ...not working
  133. 2A3 se amp power consumption
  134. "JJ" Tubes Vs other brands
  135. playing tube amps through a generator
  136. Need help with a preamp board I bought on eBay
  137. Question on Tube Rectifier..help please.
  138. 2A3 Hum Problems in SE (Please Help!)
  139. 240v to 110v for Sun Valley JB-300B
  140. Tubelab SPP Schematic
  141. SE output transformer
  142. single-ended.com annoyance
  143. A cheapo decent splitter
  144. Lightbulb Base Failure
  145. Madison Fielding Rcvr -- Filament Trick
  146. Converting from UL to Triode: Is this correct?
  147. white follower for driving mosfets.
  148. Distance between two audio input valves
  149. Series Caps on Power Supply
  150. Most expensive parts in DIY tube amp
  151. Filter Choke Selection
  152. 6072A as DAC outputstage
  153. adapting line level to suitcase record player
  154. Aikido Noval Stereo Questions
  155. 100K 2CH Volume pot recommendation
  156. Another Daft Idea
  157. Allen Model 75 user feedback needed
  158. My perfect 6550 PP amp :)
  159. Marantz 8b power transformer - open winding
  160. Chassis Grounding/ Comment on Chinese Schematic SRK-09
  161. Mini Carver Silver Seven?
  162. Using EL34 for allen wright's pp-2c
  163. Ampex 6973 mono blocks
  164. Antique Sound Lab AQ 2001 preamp issues
  165. Quad II hums
  166. Musical Fidelity XCAN V1
  167. Cathode Follower high power class B grid driver
  168. McIntosh MC 60 bias/voltage problem
  169. how to add a sub amp in parallel to S5-12G tube amplifier
  170. 5U4GB (rectifier) Arcing - What to think?
  171. I found these ripped pieces of paper..
  172. chassis grounding questions
  173. motorola ecl82 3 channel amp?
  174. Parallel Push Pull Circuit?
  175. Older valve amps chassis grounding
  176. Just about settled on building my first amp.
  177. 6L6 Triode AB Push/Pull Pout
  178. Schade and CFB exactly equivalent
  179. need some advice on updating this one
  180. Abdellah KT88 cathode follower addition?
  181. Where to buy vacuum tubes in Hong Kong city?
  182. Help needed on restoring a Bogen AP-200 amp
  183. Two driver options for 300B push pull
  184. Heath Williamson type W-3M
  185. 6n3c 12ax7 amplifier
  186. HELP needed to design/build DRD 6C33C SET
  187. k12g left channel is out
  188. Yaqin MC-100B... anyone modded for tape loop?
  189. Simple Se build, Which tube?
  190. Re-thinking Hybrid!
  191. History of RIAA standards
  192. GU48/833A medium power SET
  193. Bass control causing hum + no bass from left channel
  194. bad PX4? dark blue glow
  195. Soft Start/bucking transformer For Marantz 9 Monoblocks
  196. Direct coupling with CCS
  197. 407A/B Preamp
  198. Bad 845 tube? (video link)
  199. Dynaco PAS 4
  200. OTL Amplifier in 1990 Glass Audio Magazine
  201. Volume drop when playing and hiss noise at turning off from one channel
  202. OPT in or near loudspeaker?
  203. Soft start for tube amplifier
  204. Transformer Sizing, etc
  205. 4P1L filament oscillation
  206. Toroidal power transformers in a tube amp
  207. No left channel output
  208. Conrad Johnson PV-10 squeal!
  209. Need expert help on EL34 SE tube amplifier.
  210. 12pin/compactron tube socket
  211. Aikido audio problem w/ mains voltage fluctuations
  212. Radford STA-12
  213. New popping sound from my amp
  214. Line stage experiments with 6sn7
  215. simple SE headphone amp
  216. Aesthetix Metis Linestage
  217. Problem with Antique Sounds Pre Amp
  218. Output coupling capacitor question
  219. Screen Voltage present without B+
  220. jolida jd3000b preamp
  221. Need help on output transformer wiring alternatives
  222. Hi-End Push-Pull universal driver
  223. schematic for pentode 42 SE
  224. 6L6 / EL34 / EL84 / 6V6 frequency response curves?
  225. cheap and dirty supply
  226. EL84 SET red plating problem
  227. Using Aikido Topology to make Phono Preamp and Power Supply
  228. 5687 & OB2 as an excellent HT regulator
  229. 6S45P-E questions
  230. Extreme hybrid, a 100W with the vacuum tube sound
  231. Test Settings for a EL33/6AG6/6M6 on Eico 628 tester
  232. Chinook (Baby Amp II)
  233. Einstein Amplifier Input and Driver Section
  234. Tube System for Symphony/Jazz
  235. What is the purpose of C3 & C4?
  236. Yes, I'm the one who bought it...
  237. Capacitor Values
  238. Parks Audio / Triode ST35 kit?
  239. noob question.
  240. First stereo amp "Newbie" questions
  241. Newbie tries to design an amp
  242. Help - analysis on an output KT88 PP amp
  243. 12T10 triode connection - similar "real" triode to compare to?
  244. Recommendations for tube preamp (vinyl playback)
  245. Magnavox 8802 refurb boutique or standard parts.
  246. Allen model 75 organ amplifiers modifications
  247. Capacitance of rectifier tubes/valves near V=0??
  248. Volume/selector switch
  249. Auto Bias w/ LM317
  250. Volume drops and then comes back - anyone recognizes the sympthom?

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