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  1. Biasing Improved Williamson
  2. Vox V941 active FX Loop - I'm looking for schematics
  3. Lowering the Volume Control on Tube Amps
  4. Got the Hum out!! Thanks All
  5. How hot KT88 get? Anybody take a reading?
  6. Broskie Unbalancer
  7. Phase splitting transformer design
  8. Red plate KT88
  9. 6N16B preamp
  10. Eimac 450th nos
  11. how much clearance above tubes for KT88 enclosure
  12. Cathode preheating???
  13. RIAA Question - Power
  14. Linearity of Red RCA 5692
  15. What gauge enclosure for KT88 AMP?
  16. Output Transformer Issue???
  17. Maggie 8802 placement issue
  18. Can you recommend a tube tester?
  19. 6550 tube protection socket
  20. PT laminations are usable as OT laminations ?
  21. Are These Authentic Russian Military 1578 Vacuum Tubes?
  22. Amp ID Please
  23. Help for Main Transformer Spec for CCDA
  24. Switching SE and balanced inputs/outputs
  25. kt88 PP rectifier.
  26. How much Blue glow is ok?
  27. Recommendations on How To mono a pre amplifier?
  28. 6H6pi curves available?
  29. 1p24b
  30. help, Built from scratch Kalamazoo 2 noise
  31. 5CZ5/5BQ7A single ended amp
  32. Hopefully a simple question.
  33. 211 tube recommendations
  34. Need HELP with TUBE IMP
  35. Another unknown tube
  36. Triode Bias 101
  37. Bogen MO-200A transplant /conversion
  38. 5U4 o bridge rectifier
  39. Choosing the right transformer
  40. V-Cap Help
  41. Older tubes sound better
  42. 6J7 preamp
  43. Menygue mini/music angel amp
  44. Driving a Behringer INuke Nu1000
  45. cathode follower ecc88 on 60volt
  46. Docs for Heathkit AA-23?
  47. 45 tube amp schematic
  48. Old TO-R s15u, Should i fix it?
  49. Tube ID
  50. VTL driver tube question
  51. Fun with junk EL84 SE
  52. Enclosure ideas
  53. Burn in procedure for NOS necessary?
  54. Strange Lorenz ECC81 12AT7
  55. Amplifier first start up; Plays tone of signal generator with no speakers!
  56. Reports of the death of Audiophool have been greatly exaggerated
  57. help me identify some vintage tubes // need suggestions for possible applications!
  58. Lowering cost of audio output transformer
  59. Source for transformers in Europe
  60. morgan Jones HT caps & Anode Loads
  61. Tuning Negative feedback
  62. Hickok reference 6L6 for calibration..
  63. SET-NO FEEDBACK amplifier performance
  64. Stereo class A 6+6W - 2x 6L6G 1 x 6N2P
  65. Console Amplifier Pull:Voltages over Spec
  66. Help! My EL34B based amp arced at full volume.
  67. MUZAK 50's tube amp
  68. Tube break-in?
  69. Custom power tranny specs recommendations for 300B pse monoblocs
  70. mosfet source follower output stage.
  71. Winter upgrade project - new heating unit
  72. 6KM8 amp
  73. Power and output transformers to ground.
  74. Help with this schematic? B+? B++?
  75. What to do with this old amp? suggestions please.
  76. DIY CAT SL1 preamp
  77. Phase inverter, your comments welcomed!
  78. Basic Bias Question for PP Amp
  79. Oddwatt 5751/6550
  80. Please help me to identify Telefunken PCC ...
  81. Modification of 300B SE Amplifier
  82. 300B Tube and Amp Questions
  83. ST70 "Imposter"
  84. cathode follower question
  85. marconi tubes....can someone idntify these
  86. DeathTrap400 : : A Pretty Damn Good 300B Amp
  87. SOS: First Build, Lots of Hum
  88. 1959 Silvertone Syntronic Can Capacitor question
  89. KR Audio Marconi R valve amp?
  90. Distortion
  91. Tung-Sol 6098/6AR6 Substitution
  92. Dropout in RTP3 phono stage
  93. Audio Research EC-3 modification
  94. 300b all-DHT SET
  95. My first tube project !
  96. Trouble with homebuilt amp
  97. Music angel el34b problem
  98. Elecrolytic capacitor reforming
  99. The end of tubes?
  100. Two stages EL34 power amplifier
  101. 7199 replacement in AMPEX 6973
  102. IT coupled tube-SS hybrid amp suggestion- needs development
  103. Original Cary CAD-300se upgrades?
  104. Convert Integrated Tube Preamp to an amplifier
  105. McCurdy AM405 Schematics
  106. Looking for Neumann N149 power supply schematic
  107. B&K model 747 tube tester for EL34
  108. Behringer DEQ2496 for testing amplifiers and preamps frequency response ???
  109. I need datasheet of 8753 tube, help me!
  110. New 6L6GC Project. DC -> LTP
  111. EL84 in UL
  112. 1953 revere amp conversion
  113. Manley transformer specifications
  114. Recommended 300B SE Amplifier Designs
  115. Found a new interstage coupling method (?)
  116. Amplifier Distortion (Northern Electric)
  117. when do filament supplies need to be floated
  118. gm70 filiment transformers
  119. Replacing 6922 Preamp Tube in ARC LS7
  120. Please educate me: Tube testing, the life test, and Grid Leakage
  121. 6AR6 6098 Triode PP Load Line
  122. music reference rm5-4 schematics
  123. S5 K-12G output trans
  124. Transformer center tap question
  125. EF86 + 4*EL84PSE
  126. solid state relays for plate load switching?
  127. Dont have a power transformer?
  128. Kora Equinoxe Triode or Blue Circle BC-21.1 preamp?
  129. Pre-Amp For my Tubelab Simple P-P
  130. Power Transformer Help
  131. Analog Metric 2A3 PP Kit
  132. Good, starter OTL kit
  133. Dual SE amplifier? - (not PSE) - Take two!
  134. Mysterious SE OTL headphone amp from China?!
  135. Inv. Futterman with gain stages between PI and O/P?
  136. PSU configurations for tube amp
  137. HP Model 712b Regulated Power supply
  138. Dynaco low Power Amp
  139. 300b power suply
  140. Very Strange Preamp Issue
  141. WTB: I am looking for a Freed 1400V or Chicago 1200V/1400V Potted Power Transformer
  142. tube transformer suppliers in Mercosur
  143. Please Help: 6CJ3 Damper Diode Tube as Rectifier Question
  144. time delay sophia electric
  145. Twisting the leads of filter choke
  146. This SPUD's 4 U
  147. I am Looking for tubes
  148. Thuan
  149. Nanjing 6V6GT ( 6P6P)
  150. Should I keep this old stuff?
  151. 300b
  152. ganged output transformers
  153. Holco H4P Resistors, Should I use them?
  154. 6BX8 curves, help !
  155. SANSUI AU-70 or 1000A???
  156. General Electric YTW-1 Tube Checker
  157. Ground or amp hum-which?
  158. need help to fix the "hiss" on my tube preamp
  159. Best SE interstage 1:1 for min. 15mA?
  160. Dual Single Ended Amplifier? - (not PSE)
  161. RIP Forum Member "Ivey"
  162. Balanced Buffer Needed with a Balanced Volume Control?
  163. valves to replace opamps in cd player
  164. Replacing capacitors on Audio Research D40 power amp.
  165. No sound and low B+?
  166. Replacing capacitors on Audio Research D40 power amp.
  167. 2 Channel Tube Amp and Sub Connection
  168. EZ125 Amp Project
  169. Yaqin MS-22b Phono Amp
  170. First post and a couple P.P. questions
  171. adding a preamp to tube power amp
  172. 6SN7 6N8S preamp suggestions
  173. 300b polarity
  174. Electrolytic capacitor vs extra triode stage
  175. WE JAN 274B Dating
  176. EICO 666 Tester Help
  177. Hickock 550X signal voltage
  178. First Headphone tube amp kit to build??
  179. Anyone owns a Dynavox VR-307 Amplifier ?
  180. NOS potted Chicago Transformer 1BC-150
  181. capacitor voltage for tube amp power supply
  182. 808 SE Design Help!
  183. Why can't I build my own ARC LS-5 or CJ PV-12?
  184. Post-mortem on a 80 year old 2A3 amp
  185. 6e5p gm70 with 6d22s?
  186. 6L6-6V6-EL34-KT88-6CA7-EL84
  187. Scheme for SE amp
  188. $16,000
  189. Hybrid power amp
  190. Diagnosis please
  191. On now! Jamerson's Ampeg
  192. BK 707 Tube Tester Mods
  193. monarch 614
  194. Separate Filament and B+ Switches
  195. Dynaco Low Power with 12AY7's
  196. PTP kits available?
  197. Which OP transformer and materials?
  198. Power of Tube Amp and Transistors Amp
  199. testing tubes
  200. current servo not voltage.
  201. Help Me, How to make Pre-amp using 12AU7 tube and Op-Amp Ic mix?
  202. 300b filament
  203. DHT SE auto bias circuit
  204. Anyone try swapping 6SN7 w/ 6F8G
  205. Eliminating Cathode Bypass Caps In SET Amplifier
  206. Nano vacuum tube
  207. Help High Line voltage
  208. Switchable Amp Output?
  209. PCB or hardwire?
  210. 27 line pre amplifier
  211. Mystery tubes on FB?
  212. amplifier discussion
  213. Mikael Abdellah KT88 SE with Cornet2
  214. 5879 to 12AX7 conversion
  215. CCDA SE output stage?
  216. Bravo V2 tube headphone amp - high pitched noise?
  217. Preamp Grounding Question
  218. SE on 300B
  219. musical paradise mp 301
  220. Newbie plan
  221. Capacitor Voltage rating Question
  222. Can anybody identify this amp?
  223. Old RCA radio; can anyone ID this?
  224. Class AB2 - Kink, how and why?
  225. 6SL7, 6J5, or 6SN7 unity gain buffer amp
  226. CCDA dissimilar triode preamp
  227. NOS NEGLECTED HIGH-END AUDIO TUBE
  228. GOSS C-core suppliers in UK/Europe
  229. Old radio -> tube amplifier
  230. Sowter 8650 in SE
  231. My Russian SET
  232. Raysonic vs. DIY tube amp?
  233. Which pins to use first?
  234. Bypass gain stage on K16LS amp
  235. Schematic help for a Pilot 505 amp please
  236. Question re: Distortion in triode gain stage
  237. Newbie needs help
  238. Marantz Model 9
  239. Is my power transformer bad?
  240. japanese 6v6 amp on youtube, anyone got the link?
  241. First attempt at tube amp.
  242. 6p3s,6N1P,6j1p
  243. 6bq5 p-p diagnosise
  244. MFA Lumi suddenly whistles (on bench)
  245. Pure tetrode and negative g2
  246. ECC85, EL84 tube amp please help.
  247. Pentode buffer.
  248. 5k:8 ohm vs. 10k:16 ohm output transformer. What is the difference?
  249. Help restoring old Maas-Rowe amp
  250. Early Sansui Valve Amp

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