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  1. BCF-2
  2. Glowing Plates of Doom
  3. Modding Aikido to non-Aikido such as SRPP?
  4. DN2540 plate load.
  5. Help! Did my power cable blow his tubes?
  6. 211 amp SRPP driver
  7. Tubelab SE problem
  8. tube to replace opamps in cd player
  9. Jolida 302b started to crack/pop once a minute
  10. why it doesn't work - 300B SE power amp
  11. Trio KW-70 schematic also known as WX-400 under kenwood name
  12. New DC to AC to high voltage AC idea?
  13. LED bias for 6N1P driver
  14. DIY tube amp general inquiry
  15. 6as7 Aikido headphone amplifier
  16. Cold tubes in warm amp = smoke?
  17. Keroes: Direct-Coupled amplifier
  18. Tube ID help please.
  19. exactly HOW does a tube amp work? or a vacuum tube?
  20. David Berning's zh-230 - whats going on here?
  21. EICO HF86 scratch build question please
  22. what to do with a 12W 600ohm to 4/8 ohm output transformer?
  23. Telewatt VS71M
  24. Yamamoto 09S 300B SE Amp Problem
  25. Marantz-9
  26. 6V6 amp question
  27. Wood chassis
  28. My first project SE(T) into high end audio.
  29. Supermalloy for the Power transformer?
  30. Can I build a screen reg. with IXYS 10M45?
  31. Modified DynacoMkIV
  32. Refurbising Conrad Johnson Premier One
  33. Would using a 16ohm speaker damage my SE output transformers?
  34. Grommes/PE S-35 questions
  35. Concertina phase inverter with LED bias - is this completely wrong?
  36. Parafeed turn-on delay
  37. I'm looking for 6an8 (as V1) schematics
  38. New Project - EL84 PP and preamp - suggestions welcome
  39. The sound of modern transformers compared with vintage gear
  40. Determining the core cross sectional area, Afe, for SE OPT
  41. HT power supply high?
  42. under-run push pull
  43. 12B4 Linestage Woes
  44. Transcendent Sound Mini-Beast
  45. A Question About Positive Feedback
  46. Help with opera consonance M100plus
  47. Just received 2x PT Choke OT. best implementation ?
  48. Just received 2x PT Choke OT. best implementation ?
  49. Mystery Valve ID
  50. Oddball OT with extra secondary winding
  51. Help with Multi Section Can Cap replacement
  52. 600V bench variable supply to test transmitting valves
  53. Heater-cathode voltage spec interpretation
  54. Tell me why this wont work.
  55. headphone amp for Senns HD600
  56. Transformer orientation and suggestions.
  57. 12AU7 stereo SE mini-amp build!
  58. allen type 20a schematic
  59. 2010 lemon year for EH 6922 tubes
  60. Chinese GU50 PP
  61. Gain, Vpp and attenuation at each stage
  62. 6n14p headphone amp
  63. Heater Lifter
  64. KT88 & 6550 Pentode power output?
  65. Biasing Improved Williamson
  66. Vox V941 active FX Loop - I'm looking for schematics
  67. Lowering the Volume Control on Tube Amps
  68. Got the Hum out!! Thanks All
  69. How hot KT88 get? Anybody take a reading?
  70. Broskie Unbalancer
  71. Phase splitting transformer design
  72. Red plate KT88
  73. 6N16B preamp
  74. Eimac 450th nos
  75. how much clearance above tubes for KT88 enclosure
  76. Cathode preheating???
  77. RIAA Question - Power
  78. Linearity of Red RCA 5692
  79. What gauge enclosure for KT88 AMP?
  80. Output Transformer Issue???
  81. Maggie 8802 placement issue
  82. Can you recommend a tube tester?
  83. 6550 tube protection socket
  84. PT laminations are usable as OT laminations ?
  85. Are These Authentic Russian Military 1578 Vacuum Tubes?
  86. Amp ID Please
  87. Help for Main Transformer Spec for CCDA
  88. Switching SE and balanced inputs/outputs
  89. kt88 PP rectifier.
  90. How much Blue glow is ok?
  91. Recommendations on How To mono a pre amplifier?
  92. 6H6pi curves available?
  93. 1p24b
  94. help, Built from scratch Kalamazoo 2 noise
  95. 5CZ5/5BQ7A single ended amp
  96. Hopefully a simple question.
  97. 211 tube recommendations
  98. Need HELP with TUBE IMP
  99. Another unknown tube
  100. Triode Bias 101
  101. Bogen MO-200A transplant /conversion
  102. 5U4 o bridge rectifier
  103. Choosing the right transformer
  104. V-Cap Help
  105. Older tubes sound better
  106. 6J7 preamp
  107. Menygue mini/music angel amp
  108. Driving a Behringer INuke Nu1000
  109. cathode follower ecc88 on 60volt
  110. Docs for Heathkit AA-23?
  111. 45 tube amp schematic
  112. Old TO-R s15u, Should i fix it?
  113. Tube ID
  114. VTL driver tube question
  115. Fun with junk EL84 SE
  116. Enclosure ideas
  117. Burn in procedure for NOS necessary?
  118. Strange Lorenz ECC81 12AT7
  119. Amplifier first start up; Plays tone of signal generator with no speakers!
  120. Reports of the death of Audiophool have been greatly exaggerated
  121. help me identify some vintage tubes // need suggestions for possible applications!
  122. Lowering cost of audio output transformer
  123. Source for transformers in Europe
  124. morgan Jones HT caps & Anode Loads
  125. Tuning Negative feedback
  126. Hickok reference 6L6 for calibration..
  127. SET-NO FEEDBACK amplifier performance
  128. Stereo class A 6+6W - 2x 6L6G 1 x 6N2P
  129. Console Amplifier Pull:Voltages over Spec
  130. Help! My EL34B based amp arced at full volume.
  131. MUZAK 50's tube amp
  132. Tube break-in?
  133. Custom power tranny specs recommendations for 300B pse monoblocs
  134. mosfet source follower output stage.
  135. Winter upgrade project - new heating unit
  136. 6KM8 amp
  137. Power and output transformers to ground.
  138. Help with this schematic? B+? B++?
  139. What to do with this old amp? suggestions please.
  140. DIY CAT SL1 preamp
  141. Phase inverter, your comments welcomed!
  142. Basic Bias Question for PP Amp
  143. Oddwatt 5751/6550
  144. Please help me to identify Telefunken PCC ...
  145. Modification of 300B SE Amplifier
  146. 300B Tube and Amp Questions
  147. ST70 "Imposter"
  148. cathode follower question
  149. marconi tubes....can someone idntify these
  150. DeathTrap400 : : A Pretty Damn Good 300B Amp
  151. SOS: First Build, Lots of Hum
  152. 1959 Silvertone Syntronic Can Capacitor question
  153. KR Audio Marconi R valve amp?
  154. Distortion
  155. Tung-Sol 6098/6AR6 Substitution
  156. Dropout in RTP3 phono stage
  157. Audio Research EC-3 modification
  158. 300b all-DHT SET
  159. My first tube project !
  160. Trouble with homebuilt amp
  161. Music angel el34b problem
  162. Elecrolytic capacitor reforming
  163. The end of tubes?
  164. Two stages EL34 power amplifier
  165. 7199 replacement in AMPEX 6973
  166. IT coupled tube-SS hybrid amp suggestion- needs development
  167. Original Cary CAD-300se upgrades?
  168. Convert Integrated Tube Preamp to an amplifier
  169. McCurdy AM405 Schematics
  170. Looking for Neumann N149 power supply schematic
  171. B&K model 747 tube tester for EL34
  172. Behringer DEQ2496 for testing amplifiers and preamps frequency response ???
  173. I need datasheet of 8753 tube, help me!
  174. New 6L6GC Project. DC -> LTP
  175. EL84 in UL
  176. 1953 revere amp conversion
  177. Manley transformer specifications
  178. Recommended 300B SE Amplifier Designs
  179. Found a new interstage coupling method (?)
  180. Amplifier Distortion (Northern Electric)
  181. when do filament supplies need to be floated
  182. gm70 filiment transformers
  183. Replacing 6922 Preamp Tube in ARC LS7
  184. Please educate me: Tube testing, the life test, and Grid Leakage
  185. 6AR6 6098 Triode PP Load Line
  186. music reference rm5-4 schematics
  187. S5 K-12G output trans
  188. Transformer center tap question
  189. EF86 + 4*EL84PSE
  190. solid state relays for plate load switching?
  191. Dont have a power transformer?
  192. Kora Equinoxe Triode or Blue Circle BC-21.1 preamp?
  193. Pre-Amp For my Tubelab Simple P-P
  194. Power Transformer Help
  195. Analog Metric 2A3 PP Kit
  196. Good, starter OTL kit
  197. Dual SE amplifier? - (not PSE) - Take two!
  198. Mysterious SE OTL headphone amp from China?!
  199. Inv. Futterman with gain stages between PI and O/P?
  200. PSU configurations for tube amp
  201. HP Model 712b Regulated Power supply
  202. Dynaco low Power Amp
  203. 300b power suply
  204. Very Strange Preamp Issue
  205. WTB: I am looking for a Freed 1400V or Chicago 1200V/1400V Potted Power Transformer
  206. tube transformer suppliers in Mercosur
  207. Please Help: 6CJ3 Damper Diode Tube as Rectifier Question
  208. time delay sophia electric
  209. Twisting the leads of filter choke
  210. This SPUD's 4 U
  211. I am Looking for tubes
  212. Thuan
  213. Nanjing 6V6GT ( 6P6P)
  214. Should I keep this old stuff?
  215. 300b
  216. ganged output transformers
  217. Holco H4P Resistors, Should I use them?
  218. 6BX8 curves, help !
  219. SANSUI AU-70 or 1000A???
  220. General Electric YTW-1 Tube Checker
  221. Ground or amp hum-which?
  222. need help to fix the "hiss" on my tube preamp
  223. Best SE interstage 1:1 for min. 15mA?
  224. Dual Single Ended Amplifier? - (not PSE)
  225. RIP Forum Member "Ivey"
  226. Balanced Buffer Needed with a Balanced Volume Control?
  227. valves to replace opamps in cd player
  228. Replacing capacitors on Audio Research D40 power amp.
  229. No sound and low B+?
  230. Replacing capacitors on Audio Research D40 power amp.
  231. 2 Channel Tube Amp and Sub Connection
  232. EZ125 Amp Project
  233. Yaqin MS-22b Phono Amp
  234. First post and a couple P.P. questions
  235. adding a preamp to tube power amp
  236. 6SN7 6N8S preamp suggestions
  237. 300b polarity
  238. Electrolytic capacitor vs extra triode stage
  239. WE JAN 274B Dating
  240. EICO 666 Tester Help
  241. Hickock 550X signal voltage
  242. First Headphone tube amp kit to build??
  243. Anyone owns a Dynavox VR-307 Amplifier ?
  244. NOS potted Chicago Transformer 1BC-150
  245. capacitor voltage for tube amp power supply
  246. 808 SE Design Help!
  247. Why can't I build my own ARC LS-5 or CJ PV-12?
  248. Post-mortem on a 80 year old 2A3 amp
  249. 6e5p gm70 with 6d22s?
  250. 6L6-6V6-EL34-KT88-6CA7-EL84

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