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  1. Single Tube Amp
  2. Antique radio info
  3. Alps & Panasonic pots (what's the dael? :: pics)
  4. Vintage GE Tube Amp
  5. Troubleshooting BIG hum problem. CJ CAV-50
  6. Impedance multiplier hybrid parafeed
  7. peavey heritage 212
  8. Crosley 68CR restore
  9. Question for EU diyaudio members
  10. need advises tweaking PSE 300B
  11. CounterPoint SA-12
  12. Bleeder Resistor for Choke Input Supply
  13. Large tube anode connections caps.
  14. Gyrators
  15. newbie questions about 300B tube amp
  16. EL84 SE advice for a beginner
  17. Re: Buffer with tube PCC88
  18. Transformer impedance calcs from windings
  19. Anyone came across AirTight ATM-2 schematic?
  20. Transmitter tube hybrid - Because why not?
  21. where is the output capacitor?
  22. Clarifications on role of pre VS power
  23. My poor man version of the Raven Preamplifier.
  24. GSG problem
  25. Transformer selection/brands
  26. Newbie DC heater help
  27. HF oscillation bursts at low ( < 40Hz) frequencies
  28. Why the GZ34 Rectifiers are so expensive!
  29. OPT designing?
  30. Looking for a DIY repair guy near Toledo or Ft. Wayne
  31. beginner: which DIY kit will go well with these drivers?
  32. Xindak MT-3
  33. Loudness controls
  34. Advice on replacing Yaqin MC-10L
  35. Converting Eico HF-81 to a simple PP EL84 (pics incl.)
  36. 12at7 dc coupled to 12at7 cathodyne to drive EL34
  37. First Tube Help
  38. ampex 6793 stereo
  39. RCA Victrola 8V91
  40. what to do with these tubes? (6AQ5/6AR5)
  41. Sylvania 45C14M advice
  42. Re-designing 6DJ8 circuit for the 6CG7
  43. Hi fi kits
  44. bias capacitor
  45. Question re: Signal Ground versus HT ground
  46. Schematic to a friend
  47. Newbie question about transformers
  48. Request for suggestions. Akai M8 mono amp schematic validation.
  49. Rectifier
  50. Source for transformer parts?
  51. odd order harmonic squelching?
  52. Best Current Production 6550 / KT88
  53. Wharfedale W12 output transformers
  54. Are we committing suicide?! (Asbestos in vaccum tube base)
  55. Help me to Identify this Tube
  56. GU50 socket blues
  57. New 18W build el84/12ax7
  58. Why a follower in a parafeed triodeamp?
  59. Heads up for Australian tube amp diyers
  60. build new amp from 2 vintage tube amps?
  61. Sansui AU-111 rebuild and need some help
  62. Interstage/Input Transformer
  63. VALVEKING ROYAL8 with 6p14p-EV
  64. Ergo Ella PP Amplifier Wiring
  65. 6DX8/ECL84/6F3P Baby Huey
  66. Old tube amp info?
  67. MEIXING MING DA MC 2006 Phonostage schematics
  68. Problem with a Peavey Classic 50
  69. Just what the world needs - another EL84 amp
  70. Help me pick el34b tubes
  71. heathkit SA2
  72. Need help on RIAA
  73. GU50 plate curves
  74. What tube is this?
  75. Help with GZ34
  76. Need help in modifying Roberts 770 monoblocks
  77. PP and PPP
  78. ECL82 Single Tube Amp
  79. circuit idea
  80. Need Telefunken Hymnus 5438 Dial Glass
  81. Bias probes/Am I getting true readings
  82. How to measure output power
  83. Oddblock Wooden Case
  84. Amplifier Quandary
  85. Fuse blows instantly
  86. Looking for a fairly simple Hi gain tube pre amp project
  87. Best 2a3 PP OPT.
  88. Sharing cathode resistor and capacitor
  89. Power tubes in cascode for output section?
  90. good tube service tech in Los Angeles?
  91. Proposal for a new sticky thread
  92. The History of the EL-34 and other Pentodes and Beam Tetrodes.
  93. PCF what?
  94. stupid question about heater wire to ground
  95. OTL All American Five? (or Ten)
  96. Scored a very nice H H Scott 272!
  97. Simple DIY Stereo Tube Amp with around 20W
  98. Maton Amp
  99. New Tech
  100. LS8 pre kit as an output stage for DAC?
  101. Japanese Valves
  102. B+ delay for DHT amp
  103. QQV03-20A/CV2799
  104. 0,22 0,33 0,47.....uF
  105. Most powerful SE DIY design?
  106. 420vdc supply for a tube amp
  107. PSE 2a3 operating points?
  108. Ju-Jutsu: The Ultimate Monoblock
  109. Looking for Phono Stage ...
  110. Finished my Fisher 460t-thanks
  111. Datasheet Cpk values
  112. Eico635 tester
  113. 6p3s...
  114. Help with Amp Salvage
  115. 808 SE Build
  116. how to bias my rebuilt dynaco st 70
  117. Want help - RCA Tube Manual RIAA Phono Stage
  118. Tube Pre-amp for both CD and Phono inputs
  119. Cascode Driver Oscillation
  120. 872b or 6gj5a for a homebrew bass amp
  121. how does it sound and perform?
  122. Bootstrapped long tail
  123. Thorens TEM 3200 clone
  124. Identifying this RCA Transformer
  125. Tube burning
  126. Add Standby Directly after Rectifier, or After First Filter Stage?
  127. Help with some tube ID
  128. CCS power amp bias
  129. this is EL34 tube of what model?
  130. Looking for constructive criticism on my first design
  131. Audio note kit 1 vs Meishu
  132. Tube Amp Gain V.S. RF Gain
  133. Kool-mu material for building audio transformer
  134. Buzz/Hum in Matrix amplifier
  135. Optimation PA-250AC Lab-Grade Audio Amplifier
  136. RS1003 in SE triode-UL monoblocks
  137. Bypass capacitors in Tube amps
  138. Basic question re: gNFB around 3 stages
  139. James PP Audio Transformers, any good?
  140. Seeking advice for tube amp kit on,seems to be, chinese site
  141. Tube pricing from 1981
  142. 6e5p WCF headphone amp with no cap!
  143. "How it's made" vacuum tubes..
  144. Citation I and IV phono schematic query
  145. GS-4V High-mu russian triode for RIAA preamp
  146. good source for amp chassis in europe?
  147. Help identify and replacement of ? resistor
  148. New tube amp diy kit required power?
  149. Decoupling DC heater supply between valves..benefit?
  150. The Aikido Comedy: Straight Talk
  151. Recapping tube preamp questions
  152. A tube amp that's actually a tesla coil.
  153. Tube "Orientation"
  154. 18 watt tremolo vvr
  155. Pre amp output, would this work?
  156. Aikido Power Amp.....Possible??
  157. 12AX7 questions
  158. 6550 PUSH-PULL
  159. CCS at plate? Unknown schematic part
  160. Most odd grid choke behaviour.
  161. Spec for Altec TP-404 Transformer
  162. why do wimpy drivers for 2A3 work as well as they do?
  163. Seeking advice on Tube buffer / pre-amp
  164. 8x Push-pull KT88 class A in triode mode
  165. Tube Pre dull into Tube Amp - cause ?
  166. FINALLY I can start building my GM70
  167. Russian triodes ГИ-15Б arriving in a few days
  168. Cap or resistor
  169. KT88/PP driver confusion
  170. Simple SE GU-50
  171. Darling 1626
  172. 01a DHT Preamp
  173. Suitable tubes for Gomes output
  174. phono line stage project
  175. Whats wrong with this circuit?
  176. Any Newcomb Gurus.?
  177. Preamp Tube MU Level?
  178. SRPP Paraccordion topology ?
  179. Replacing 6922 with 6FQ7 in Conrad Johnson ET3 preamp
  180. Modification of a Chinese KT90 PP amplifier
  181. Tricky Headphone Amp design for AK4396
  182. How to know voltage bias adjustmentwith this data?
  183. Strange Stability Enhancement Trick
  184. has anyone bought tubes from http://www.tangotubes.com/
  185. “Earmax / G3 / Morgan Jones / Cavalli” Headphone Amp Reissue with 6SN7 Steroids
  186. Ever heard of British transofmer company "Ro"?
  187. A friend gave me some random tubes...
  188. Replacement for 6e2 without vu
  189. PP GU50 triode strapped project
  190. Tube VAS stage questions???
  191. OT impedance help: 9.8 vs 8k
  192. popping & crackling noise from restored valve AM radio
  193. Choosing 6550 PP Output Transformer
  194. Reversing Interstage Transformer
  195. Aikido 9 pin All in One Build
  196. KT88 PP UL Design Help Needed
  197. Cayin A-300B schematic needed
  198. Please Recommend a Preamp!
  199. Which Antek transforms to use
  200. Integrated Amp as Preamp and Subwoofer amp
  201. Uses for 715C Pulse Tetrode
  202. PP KT-88 w/866A MV HT Supply
  203. EC88 (6DL4) NOS Mullard - any use at all?
  204. Advice sought on thermionic headphone amp
  205. Eico HF-81: Input Selector bypass
  206. 12b4 bass rolloff problem
  207. No Right ch sound on yaqin mc10l
  208. tester causing bias to rise?
  209. Heaters & Filaments: AC vs. DC
  210. Old HP power transformers... need some wiring advice!
  211. Old HP power transformers... need some wiring advice!
  212. RCA RS177H just dosen't sound right! Caps?
  213. silicon or tube rectifier in an EL34 SE
  214. Help original 300G LEGACY
  215. 813 Tube-Steak!
  216. Basic 12AU7 heatrr question
  217. Shipping a vacuum tube to China
  218. 6DJ8/ECC88-SRPP Tube Preamplifier
  219. Help needed: hum noise in Eimac 250TL driven by 75TL Single End Amplifier
  220. Found tons of Tubes,and many other parts
  221. Ampeg B15 Heritage Clone Help
  222. EZ80 Data Sheets, R-Lim and Max Cap
  223. Filament Voltages CT vs Non-CT
  224. Troubleshooting help needed
  225. What is it? Tube guessology
  226. Bass & Treble controls, or rather lack of.
  227. Quicksilver 8417 Power Supply Question
  228. Why a sudden distortion in treble of this SET amplifier?
  229. 5f1 Champ grounding
  230. Antitriode PP with EL34
  231. How to calculate Pout for Push Pull design
  232. Newbie Question - Power Transformer vs Isolation Transformer
  233. All tubes red plating
  234. Exceeding bias voltage?
  235. Vacuum State RTP Preamp Problem
  236. Alfred Morgan Tube Preamplifier
  237. 845 vs GM70
  238. Looking for project suggestions - 12au7 pre-amp?
  239. Contemporary tradition breaking amp schematics.
  240. ul - triode coupled screen grid resistor
  241. Optimum driver valve for an interstage-transformer-driven SE 300B
  242. 6C33C
  243. Soundcraftsmen 5050
  244. Tetra Phono Question
  245. WF tube
  246. Opt laminations isolation
  247. Heretical Source
  248. Broskie auto bias
  249. heater wiring - the Good the Bad and the Ugly
  250. AC Line Filter

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