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  1. Question re: Signal Ground versus HT ground
  2. Schematic to a friend
  3. Newbie question about transformers
  4. Request for suggestions. Akai M8 mono amp schematic validation.
  5. Rectifier
  6. Source for transformer parts?
  7. odd order harmonic squelching?
  8. Best Current Production 6550 / KT88
  9. Wharfedale W12 output transformers
  10. Are we committing suicide?! (Asbestos in vaccum tube base)
  11. Help me to Identify this Tube
  12. GU50 socket blues
  13. New 18W build el84/12ax7
  14. Why a follower in a parafeed triodeamp?
  15. Heads up for Australian tube amp diyers
  16. build new amp from 2 vintage tube amps?
  17. Sansui AU-111 rebuild and need some help
  18. Interstage/Input Transformer
  19. VALVEKING ROYAL8 with 6p14p-EV
  20. Ergo Ella PP Amplifier Wiring
  21. 6DX8/ECL84/6F3P Baby Huey
  22. Old tube amp info?
  23. MEIXING MING DA MC 2006 Phonostage schematics
  24. Problem with a Peavey Classic 50
  25. Just what the world needs - another EL84 amp
  26. Help me pick el34b tubes
  27. heathkit SA2
  28. Need help on RIAA
  29. GU50 plate curves
  30. What tube is this?
  31. Help with GZ34
  32. Need help in modifying Roberts 770 monoblocks
  33. PP and PPP
  34. ECL82 Single Tube Amp
  35. circuit idea
  36. Need Telefunken Hymnus 5438 Dial Glass
  37. Bias probes/Am I getting true readings
  38. How to measure output power
  39. Oddblock Wooden Case
  40. Amplifier Quandary
  41. Fuse blows instantly
  42. Looking for a fairly simple Hi gain tube pre amp project
  43. Best 2a3 PP OPT.
  44. Sharing cathode resistor and capacitor
  45. Power tubes in cascode for output section?
  46. good tube service tech in Los Angeles?
  47. Proposal for a new sticky thread
  48. The History of the EL-34 and other Pentodes and Beam Tetrodes.
  49. PCF what?
  50. stupid question about heater wire to ground
  51. OTL All American Five? (or Ten)
  52. Scored a very nice H H Scott 272!
  53. Simple DIY Stereo Tube Amp with around 20W
  54. Maton Amp
  55. New Tech
  56. LS8 pre kit as an output stage for DAC?
  57. Japanese Valves
  58. B+ delay for DHT amp
  59. QQV03-20A/CV2799
  60. 0,22 0,33 0,47.....uF
  61. Most powerful SE DIY design?
  62. 420vdc supply for a tube amp
  63. PSE 2a3 operating points?
  64. Ju-Jutsu: The Ultimate Monoblock
  65. Looking for Phono Stage ...
  66. Finished my Fisher 460t-thanks
  67. Datasheet Cpk values
  68. Eico635 tester
  69. 6p3s...
  70. Help with Amp Salvage
  71. 808 SE Build
  72. how to bias my rebuilt dynaco st 70
  73. Want help - RCA Tube Manual RIAA Phono Stage
  74. Tube Pre-amp for both CD and Phono inputs
  75. Cascode Driver Oscillation
  76. 872b or 6gj5a for a homebrew bass amp
  77. how does it sound and perform?
  78. Bootstrapped long tail
  79. Thorens TEM 3200 clone
  80. Identifying this RCA Transformer
  81. Tube burning
  82. Add Standby Directly after Rectifier, or After First Filter Stage?
  83. Help with some tube ID
  84. CCS power amp bias
  85. this is EL34 tube of what model?
  86. Looking for constructive criticism on my first design
  87. Audio note kit 1 vs Meishu
  88. Tube Amp Gain V.S. RF Gain
  89. Kool-mu material for building audio transformer
  90. Buzz/Hum in Matrix amplifier
  91. Optimation PA-250AC Lab-Grade Audio Amplifier
  92. RS1003 in SE triode-UL monoblocks
  93. Bypass capacitors in Tube amps
  94. Basic question re: gNFB around 3 stages
  95. James PP Audio Transformers, any good?
  96. Seeking advice for tube amp kit on,seems to be, chinese site
  97. Tube pricing from 1981
  98. 6e5p WCF headphone amp with no cap!
  99. "How it's made" vacuum tubes..
  100. Citation I and IV phono schematic query
  101. GS-4V High-mu russian triode for RIAA preamp
  102. good source for amp chassis in europe?
  103. Help identify and replacement of ? resistor
  104. New tube amp diy kit required power?
  105. Decoupling DC heater supply between valves..benefit?
  106. The Aikido Comedy: Straight Talk
  107. Recapping tube preamp questions
  108. A tube amp that's actually a tesla coil.
  109. Tube "Orientation"
  110. 18 watt tremolo vvr
  111. Pre amp output, would this work?
  112. Aikido Power Amp.....Possible??
  113. 12AX7 questions
  114. 6550 PUSH-PULL
  115. CCS at plate? Unknown schematic part
  116. Most odd grid choke behaviour.
  117. Spec for Altec TP-404 Transformer
  118. why do wimpy drivers for 2A3 work as well as they do?
  119. Seeking advice on Tube buffer / pre-amp
  120. 8x Push-pull KT88 class A in triode mode
  121. Tube Pre dull into Tube Amp - cause ?
  122. FINALLY I can start building my GM70
  123. Russian triodes ГИ-15Б arriving in a few days
  124. Cap or resistor
  125. KT88/PP driver confusion
  126. Simple SE GU-50
  127. Darling 1626
  128. 01a DHT Preamp
  129. Suitable tubes for Gomes output
  130. phono line stage project
  131. Whats wrong with this circuit?
  132. Any Newcomb Gurus.?
  133. Preamp Tube MU Level?
  134. SRPP Paraccordion topology ?
  135. Replacing 6922 with 6FQ7 in Conrad Johnson ET3 preamp
  136. Modification of a Chinese KT90 PP amplifier
  137. Tricky Headphone Amp design for AK4396
  138. How to know voltage bias adjustmentwith this data?
  139. Strange Stability Enhancement Trick
  140. has anyone bought tubes from http://www.tangotubes.com/
  141. “Earmax / G3 / Morgan Jones / Cavalli” Headphone Amp Reissue with 6SN7 Steroids
  142. Ever heard of British transofmer company "Ro"?
  143. A friend gave me some random tubes...
  144. Replacement for 6e2 without vu
  145. PP GU50 triode strapped project
  146. Tube VAS stage questions???
  147. OT impedance help: 9.8 vs 8k
  148. popping & crackling noise from restored valve AM radio
  149. Choosing 6550 PP Output Transformer
  150. Reversing Interstage Transformer
  151. Aikido 9 pin All in One Build
  152. KT88 PP UL Design Help Needed
  153. Cayin A-300B schematic needed
  154. Please Recommend a Preamp!
  155. Which Antek transforms to use
  156. Integrated Amp as Preamp and Subwoofer amp
  157. Uses for 715C Pulse Tetrode
  158. PP KT-88 w/866A MV HT Supply
  159. EC88 (6DL4) NOS Mullard - any use at all?
  160. Advice sought on thermionic headphone amp
  161. Eico HF-81: Input Selector bypass
  162. 12b4 bass rolloff problem
  163. No Right ch sound on yaqin mc10l
  164. tester causing bias to rise?
  165. Heaters & Filaments: AC vs. DC
  166. Old HP power transformers... need some wiring advice!
  167. Old HP power transformers... need some wiring advice!
  168. RCA RS177H just dosen't sound right! Caps?
  169. silicon or tube rectifier in an EL34 SE
  170. Help original 300G LEGACY
  171. 813 Tube-Steak!
  172. Basic 12AU7 heatrr question
  173. Shipping a vacuum tube to China
  174. 6DJ8/ECC88-SRPP Tube Preamplifier
  175. Help needed: hum noise in Eimac 250TL driven by 75TL Single End Amplifier
  176. Found tons of Tubes,and many other parts
  177. Ampeg B15 Heritage Clone Help
  178. EZ80 Data Sheets, R-Lim and Max Cap
  179. Filament Voltages CT vs Non-CT
  180. Troubleshooting help needed
  181. What is it? Tube guessology
  182. Bass & Treble controls, or rather lack of.
  183. Quicksilver 8417 Power Supply Question
  184. Why a sudden distortion in treble of this SET amplifier?
  185. 5f1 Champ grounding
  186. Antitriode PP with EL34
  187. How to calculate Pout for Push Pull design
  188. Newbie Question - Power Transformer vs Isolation Transformer
  189. All tubes red plating
  190. Exceeding bias voltage?
  191. Vacuum State RTP Preamp Problem
  192. Alfred Morgan Tube Preamplifier
  193. 845 vs GM70
  194. Looking for project suggestions - 12au7 pre-amp?
  195. Contemporary tradition breaking amp schematics.
  196. ul - triode coupled screen grid resistor
  197. Optimum driver valve for an interstage-transformer-driven SE 300B
  198. 6C33C
  199. Soundcraftsmen 5050
  200. Tetra Phono Question
  201. WF tube
  202. Opt laminations isolation
  203. Heretical Source
  204. Broskie auto bias
  205. heater wiring - the Good the Bad and the Ugly
  206. AC Line Filter
  207. Counterpoint SA5000 Help
  208. Problem with ECC83 measurement values - please help
  209. Newbie Bias help ?
  210. AV305m AVVT
  211. Pot mechanical resistance and restoration..
  212. HMV Little Nipper mantle radio = 1 STEREO
  213. What's the simplest way to adjust filament voltage?
  214. GDAP-06
  215. Audio Note L6 - Schematic?
  216. Preventing HV flashover on socket pins
  217. Best "Vintage" Stereo Pres that SoftClip and lotsa Harmonics
  218. SE with PP OPT's?
  219. 12ax7/12AT7 Recommendations
  220. HELP: Eimac 75TL amp high frequency roll off
  221. unison reserch s8, let's build it!
  222. Where do super high end companies get their transformers?
  223. Tube Tester Panel Meter
  224. Attic find AMP
  225. Help getting Imax and Eb approximations for a push-pull amp
  226. Is this amp OK to buy, or is this a problem?
  227. Swirling Harmonics, can it be described
  228. Line stage with u-follower and nfb
  229. Newbie looking for help, pre-out to tube amp.
  230. Unison research integrated ampliphier schematics
  231. FET CCS anode load and RFI/oscillation.
  232. Old schematic
  233. Newbie Looking for Replacement OPTS Motorola Console Amp
  234. Merlyn- May AudioXpress
  235. How to clean tubes?
  236. does the 3A5 have the stones to drive a 2A3?
  237. New amp: 13DE7 SE hybrid
  238. My amp is motorboating, improve it with b+ regulator ?
  239. Can you identify these amps?
  240. Sowter SA01 - anyone used it ?
  241. Mikael‑Abdellah‑SE‑KT88 Bias & Voltage readings Help?
  242. Resistors and combinations
  243. thr light in pcl82
  244. Bogen L330 - Worth restoring?
  245. Supro model 24 amp transformers
  246. Those Magnificent Television Tubes
  247. Demagnetizing OPT?
  248. Real DIY fun hybrid testing.
  249. Extreme hum in EQ output
  250. 46 triode-strapped DHT spice model

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