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  1. 12B4 Linestage Woes
  2. Transcendent Sound Mini-Beast
  3. A Question About Positive Feedback
  4. Help with opera consonance M100plus
  5. Just received 2x PT Choke OT. best implementation ?
  6. Just received 2x PT Choke OT. best implementation ?
  7. Mystery Valve ID
  8. Oddball OT with extra secondary winding
  9. Help with Multi Section Can Cap replacement
  10. 600V bench variable supply to test transmitting valves
  11. Heater-cathode voltage spec interpretation
  12. Tell me why this wont work.
  13. headphone amp for Senns HD600
  14. Transformer orientation and suggestions.
  15. 12AU7 stereo SE mini-amp build!
  16. allen type 20a schematic
  17. 2010 lemon year for EH 6922 tubes
  18. Chinese GU50 PP
  19. Gain, Vpp and attenuation at each stage
  20. 6n14p headphone amp
  21. Heater Lifter
  22. KT88 & 6550 Pentode power output?
  23. Biasing Improved Williamson
  24. Lowering the Volume Control on Tube Amps
  25. Got the Hum out!! Thanks All
  26. How hot KT88 get? Anybody take a reading?
  27. Broskie Unbalancer
  28. Phase splitting transformer design
  29. Red plate KT88
  30. 6N16B preamp
  31. Eimac 450th nos
  32. how much clearance above tubes for KT88 enclosure
  33. Cathode preheating???
  34. RIAA Question - Power
  35. Linearity of Red RCA 5692
  36. What gauge enclosure for KT88 AMP?
  37. Output Transformer Issue???
  38. Maggie 8802 placement issue
  39. 6550 tube protection socket
  40. PT laminations are usable as OT laminations ?
  41. Are These Authentic Russian Military 1578 Vacuum Tubes?
  42. Amp ID Please
  43. Help for Main Transformer Spec for CCDA
  44. Switching SE and balanced inputs/outputs
  45. kt88 PP rectifier.
  46. How much Blue glow is ok?
  47. Recommendations on How To mono a pre amplifier?
  48. 6H6pi curves available?
  49. 1p24b
  50. help, Built from scratch Kalamazoo 2 noise
  51. 5CZ5/5BQ7A single ended amp
  52. Hopefully a simple question.
  53. 211 tube recommendations
  54. Need HELP with TUBE IMP
  55. Another unknown tube
  56. Triode Bias 101
  57. Bogen MO-200A transplant /conversion
  58. 5U4 o bridge rectifier
  59. Choosing the right transformer
  60. V-Cap Help
  61. Older tubes sound better
  62. 6J7 preamp
  63. Menygue mini/music angel amp
  64. Driving a Behringer INuke Nu1000
  65. cathode follower ecc88 on 60volt
  66. Docs for Heathkit AA-23?
  67. 45 tube amp schematic
  68. Old TO-R s15u, Should i fix it?
  69. Tube ID
  70. VTL driver tube question
  71. Fun with junk EL84 SE
  72. Enclosure ideas
  73. Burn in procedure for NOS necessary?
  74. Strange Lorenz ECC81 12AT7
  75. Amplifier first start up; Plays tone of signal generator with no speakers!
  76. Reports of the death of Audiophool have been greatly exaggerated
  77. help me identify some vintage tubes // need suggestions for possible applications!
  78. Lowering cost of audio output transformer
  79. Source for transformers in Europe
  80. morgan Jones HT caps & Anode Loads
  81. Tuning Negative feedback
  82. SET-NO FEEDBACK amplifier performance
  83. Stereo class A 6+6W - 2x 6L6G 1 x 6N2P
  84. Console Amplifier Pull:Voltages over Spec
  85. Help! My EL34B based amp arced at full volume.
  86. MUZAK 50's tube amp
  87. Tube break-in?
  88. Custom power tranny specs recommendations for 300B pse monoblocs
  89. mosfet source follower output stage.
  90. Winter upgrade project - new heating unit
  91. 6KM8 amp
  92. Power and output transformers to ground.
  93. Help with this schematic? B+? B++?
  94. What to do with this old amp? suggestions please.
  95. DIY CAT SL1 preamp
  96. Phase inverter, your comments welcomed!
  97. Basic Bias Question for PP Amp
  98. Oddwatt 5751/6550
  99. Please help me to identify Telefunken PCC ...
  100. Modification of 300B SE Amplifier
  101. 300B Tube and Amp Questions
  102. ST70 "Imposter"
  103. cathode follower question
  104. marconi tubes....can someone idntify these
  105. DeathTrap400 : : A Pretty Damn Good 300B Amp
  106. SOS: First Build, Lots of Hum
  107. KR Audio Marconi R valve amp?
  108. Distortion
  109. Tung-Sol 6098/6AR6 Substitution
  110. Dropout in RTP3 phono stage
  111. Audio Research EC-3 modification
  112. 300b all-DHT SET
  113. My first tube project !
  114. Trouble with homebuilt amp
  115. Music angel el34b problem
  116. The end of tubes?
  117. Two stages EL34 power amplifier
  118. 7199 replacement in AMPEX 6973
  119. IT coupled tube-SS hybrid amp suggestion- needs development
  120. Original Cary CAD-300se upgrades?
  121. Convert Integrated Tube Preamp to an amplifier
  122. McCurdy AM405 Schematics
  123. Looking for Neumann N149 power supply schematic
  124. Behringer DEQ2496 for testing amplifiers and preamps frequency response ???
  125. I need datasheet of 8753 tube, help me!
  126. New 6L6GC Project. DC -> LTP
  127. EL84 in UL
  128. 1953 revere amp conversion
  129. Manley transformer specifications
  130. Recommended 300B SE Amplifier Designs
  131. Found a new interstage coupling method (?)
  132. Amplifier Distortion (Northern Electric)
  133. when do filament supplies need to be floated
  134. gm70 filiment transformers
  135. Replacing 6922 Preamp Tube in ARC LS7
  136. Please educate me: Tube testing, the life test, and Grid Leakage
  137. 6AR6 6098 Triode PP Load Line
  138. music reference rm5-4 schematics
  139. S5 K-12G output trans
  140. Transformer center tap question
  141. EF86 + 4*EL84PSE
  142. solid state relays for plate load switching?
  143. Dont have a power transformer?
  144. Kora Equinoxe Triode or Blue Circle BC-21.1 preamp?
  145. Power Transformer Help
  146. Analog Metric 2A3 PP Kit
  147. Good, starter OTL kit
  148. Dual SE amplifier? - (not PSE) - Take two!
  149. Mysterious SE OTL headphone amp from China?!
  150. Inv. Futterman with gain stages between PI and O/P?
  151. PSU configurations for tube amp
  152. HP Model 712b Regulated Power supply
  153. Dynaco low Power Amp
  154. 300b power suply
  155. Very Strange Preamp Issue
  156. WTB: I am looking for a Freed 1400V or Chicago 1200V/1400V Potted Power Transformer
  157. tube transformer suppliers in Mercosur
  158. Please Help: 6CJ3 Damper Diode Tube as Rectifier Question
  159. time delay sophia electric
  160. Twisting the leads of filter choke
  161. This SPUD's 4 U
  162. I am Looking for tubes
  163. Thuan
  164. Nanjing 6V6GT ( 6P6P)
  165. Should I keep this old stuff?
  166. 300b
  167. ganged output transformers
  168. Holco H4P Resistors, Should I use them?
  169. 6BX8 curves, help !
  170. SANSUI AU-70 or 1000A???
  171. General Electric YTW-1 Tube Checker
  172. Ground or amp hum-which?
  173. need help to fix the "hiss" on my tube preamp
  174. Best SE interstage 1:1 for min. 15mA?
  175. Dual Single Ended Amplifier? - (not PSE)
  176. RIP Forum Member "Ivey"
  177. valves to replace opamps in cd player
  178. Replacing capacitors on Audio Research D40 power amp.
  179. No sound and low B+?
  180. Replacing capacitors on Audio Research D40 power amp.
  181. 2 Channel Tube Amp and Sub Connection
  182. EZ125 Amp Project
  183. Yaqin MS-22b Phono Amp
  184. First post and a couple P.P. questions
  185. adding a preamp to tube power amp
  186. 6SN7 6N8S preamp suggestions
  187. 300b polarity
  188. Electrolytic capacitor vs extra triode stage
  189. WE JAN 274B Dating
  190. EICO 666 Tester Help
  191. Hickock 550X signal voltage
  192. First Headphone tube amp kit to build??
  193. NOS potted Chicago Transformer 1BC-150
  194. capacitor voltage for tube amp power supply
  195. 808 SE Design Help!
  196. Why can't I build my own ARC LS-5 or CJ PV-12?
  197. Post-mortem on a 80 year old 2A3 amp
  198. 6e5p gm70 with 6d22s?
  199. 6L6-6V6-EL34-KT88-6CA7-EL84
  200. Scheme for SE amp
  201. $16,000
  202. Hybrid power amp
  203. Diagnosis please
  204. monarch 614
  205. Separate Filament and B+ Switches
  206. Dynaco Low Power with 12AY7's
  207. PTP kits available?
  208. Which OP transformer and materials?
  209. Power of Tube Amp and Transistors Amp
  210. testing tubes
  211. current servo not voltage.
  212. Help Me, How to make Pre-amp using 12AU7 tube and Op-Amp Ic mix?
  213. 300b filament
  214. DHT SE auto bias circuit
  215. Anyone try swapping 6SN7 w/ 6F8G
  216. Eliminating Cathode Bypass Caps In SET Amplifier
  217. Nano vacuum tube
  218. Help High Line voltage
  219. Switchable Amp Output?
  220. PCB or hardwire?
  221. 27 line pre amplifier
  222. Mystery tubes on FB?
  223. amplifier discussion
  224. Mikael Abdellah KT88 SE with Cornet2
  225. 5879 to 12AX7 conversion
  226. CCDA SE output stage?
  227. Bravo V2 tube headphone amp - high pitched noise?
  228. Preamp Grounding Question
  229. SE on 300B
  230. musical paradise mp 301
  231. Newbie plan
  232. Can anybody identify this amp?
  233. Old RCA radio; can anyone ID this?
  234. Class AB2 - Kink, how and why?
  235. 6SL7, 6J5, or 6SN7 unity gain buffer amp
  236. CCDA dissimilar triode preamp
  237. NOS NEGLECTED HIGH-END AUDIO TUBE
  238. GOSS C-core suppliers in UK/Europe
  239. Old radio -> tube amplifier
  240. Sowter 8650 in SE
  241. My Russian SET
  242. Raysonic vs. DIY tube amp?
  243. Which pins to use first?
  244. Bypass gain stage on K16LS amp
  245. Schematic help for a Pilot 505 amp please
  246. Question re: Distortion in triode gain stage
  247. Newbie needs help
  248. Marantz Model 9
  249. Is my power transformer bad?
  250. japanese 6v6 amp on youtube, anyone got the link?

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