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  1. Refurbising Conrad Johnson Premier One
  2. Would using a 16ohm speaker damage my SE output transformers?
  3. Grommes/PE S-35 questions
  4. Concertina phase inverter with LED bias - is this completely wrong?
  5. Parafeed turn-on delay
  6. I'm looking for 6an8 (as V1) schematics
  7. New Project - EL84 PP and preamp - suggestions welcome
  8. The sound of modern transformers compared with vintage gear
  9. Determining the core cross sectional area, Afe, for SE OPT
  10. HT power supply high?
  11. under-run push pull
  12. 12B4 Linestage Woes
  13. Transcendent Sound Mini-Beast
  14. A Question About Positive Feedback
  15. Help with opera consonance M100plus
  16. Just received 2x PT Choke OT. best implementation ?
  17. Just received 2x PT Choke OT. best implementation ?
  18. Mystery Valve ID
  19. Oddball OT with extra secondary winding
  20. Help with Multi Section Can Cap replacement
  21. 600V bench variable supply to test transmitting valves
  22. Heater-cathode voltage spec interpretation
  23. Tell me why this wont work.
  24. headphone amp for Senns HD600
  25. Transformer orientation and suggestions.
  26. 12AU7 stereo SE mini-amp build!
  27. allen type 20a schematic
  28. 2010 lemon year for EH 6922 tubes
  29. Chinese GU50 PP
  30. Gain, Vpp and attenuation at each stage
  31. 6n14p headphone amp
  32. Heater Lifter
  33. KT88 & 6550 Pentode power output?
  34. Biasing Improved Williamson
  35. Vox V941 active FX Loop - I'm looking for schematics
  36. Lowering the Volume Control on Tube Amps
  37. Got the Hum out!! Thanks All
  38. How hot KT88 get? Anybody take a reading?
  39. Broskie Unbalancer
  40. Phase splitting transformer design
  41. Red plate KT88
  42. 6N16B preamp
  43. Eimac 450th nos
  44. how much clearance above tubes for KT88 enclosure
  45. Cathode preheating???
  46. RIAA Question - Power
  47. Linearity of Red RCA 5692
  48. What gauge enclosure for KT88 AMP?
  49. Output Transformer Issue???
  50. Maggie 8802 placement issue
  51. Can you recommend a tube tester?
  52. 6550 tube protection socket
  53. PT laminations are usable as OT laminations ?
  54. Are These Authentic Russian Military 1578 Vacuum Tubes?
  55. Amp ID Please
  56. Help for Main Transformer Spec for CCDA
  57. Switching SE and balanced inputs/outputs
  58. kt88 PP rectifier.
  59. How much Blue glow is ok?
  60. Recommendations on How To mono a pre amplifier?
  61. 6H6pi curves available?
  62. 1p24b
  63. help, Built from scratch Kalamazoo 2 noise
  64. 5CZ5/5BQ7A single ended amp
  65. Hopefully a simple question.
  66. 211 tube recommendations
  67. Need HELP with TUBE IMP
  68. Another unknown tube
  69. Triode Bias 101
  70. Bogen MO-200A transplant /conversion
  71. 5U4 o bridge rectifier
  72. Choosing the right transformer
  73. V-Cap Help
  74. Older tubes sound better
  75. 6J7 preamp
  76. Menygue mini/music angel amp
  77. Driving a Behringer INuke Nu1000
  78. cathode follower ecc88 on 60volt
  79. Docs for Heathkit AA-23?
  80. 45 tube amp schematic
  81. Old TO-R s15u, Should i fix it?
  82. Tube ID
  83. VTL driver tube question
  84. Fun with junk EL84 SE
  85. Enclosure ideas
  86. Burn in procedure for NOS necessary?
  87. Strange Lorenz ECC81 12AT7
  88. Amplifier first start up; Plays tone of signal generator with no speakers!
  89. Reports of the death of Audiophool have been greatly exaggerated
  90. help me identify some vintage tubes // need suggestions for possible applications!
  91. Lowering cost of audio output transformer
  92. Source for transformers in Europe
  93. morgan Jones HT caps & Anode Loads
  94. Tuning Negative feedback
  95. Hickok reference 6L6 for calibration..
  96. SET-NO FEEDBACK amplifier performance
  97. Stereo class A 6+6W - 2x 6L6G 1 x 6N2P
  98. Console Amplifier Pull:Voltages over Spec
  99. Help! My EL34B based amp arced at full volume.
  100. MUZAK 50's tube amp
  101. Tube break-in?
  102. Custom power tranny specs recommendations for 300B pse monoblocs
  103. mosfet source follower output stage.
  104. Winter upgrade project - new heating unit
  105. 6KM8 amp
  106. Power and output transformers to ground.
  107. Help with this schematic? B+? B++?
  108. What to do with this old amp? suggestions please.
  109. DIY CAT SL1 preamp
  110. Phase inverter, your comments welcomed!
  111. Basic Bias Question for PP Amp
  112. Oddwatt 5751/6550
  113. Please help me to identify Telefunken PCC ...
  114. Modification of 300B SE Amplifier
  115. 300B Tube and Amp Questions
  116. ST70 "Imposter"
  117. cathode follower question
  118. marconi tubes....can someone idntify these
  119. DeathTrap400 : : A Pretty Damn Good 300B Amp
  120. SOS: First Build, Lots of Hum
  121. 1959 Silvertone Syntronic Can Capacitor question
  122. KR Audio Marconi R valve amp?
  123. Distortion
  124. Tung-Sol 6098/6AR6 Substitution
  125. Dropout in RTP3 phono stage
  126. Audio Research EC-3 modification
  127. 300b all-DHT SET
  128. My first tube project !
  129. Trouble with homebuilt amp
  130. Music angel el34b problem
  131. Elecrolytic capacitor reforming
  132. The end of tubes?
  133. Two stages EL34 power amplifier
  134. 7199 replacement in AMPEX 6973
  135. IT coupled tube-SS hybrid amp suggestion- needs development
  136. Original Cary CAD-300se upgrades?
  137. Convert Integrated Tube Preamp to an amplifier
  138. McCurdy AM405 Schematics
  139. Looking for Neumann N149 power supply schematic
  140. B&K model 747 tube tester for EL34
  141. Behringer DEQ2496 for testing amplifiers and preamps frequency response ???
  142. I need datasheet of 8753 tube, help me!
  143. New 6L6GC Project. DC -> LTP
  144. EL84 in UL
  145. 1953 revere amp conversion
  146. Manley transformer specifications
  147. Recommended 300B SE Amplifier Designs
  148. Found a new interstage coupling method (?)
  149. Amplifier Distortion (Northern Electric)
  150. when do filament supplies need to be floated
  151. gm70 filiment transformers
  152. Replacing 6922 Preamp Tube in ARC LS7
  153. Please educate me: Tube testing, the life test, and Grid Leakage
  154. 6AR6 6098 Triode PP Load Line
  155. music reference rm5-4 schematics
  156. S5 K-12G output trans
  157. Transformer center tap question
  158. EF86 + 4*EL84PSE
  159. solid state relays for plate load switching?
  160. Dont have a power transformer?
  161. Kora Equinoxe Triode or Blue Circle BC-21.1 preamp?
  162. Pre-Amp For my Tubelab Simple P-P
  163. Power Transformer Help
  164. Analog Metric 2A3 PP Kit
  165. Good, starter OTL kit
  166. Dual SE amplifier? - (not PSE) - Take two!
  167. Mysterious SE OTL headphone amp from China?!
  168. Inv. Futterman with gain stages between PI and O/P?
  169. PSU configurations for tube amp
  170. HP Model 712b Regulated Power supply
  171. Dynaco low Power Amp
  172. 300b power suply
  173. Very Strange Preamp Issue
  174. WTB: I am looking for a Freed 1400V or Chicago 1200V/1400V Potted Power Transformer
  175. tube transformer suppliers in Mercosur
  176. Please Help: 6CJ3 Damper Diode Tube as Rectifier Question
  177. time delay sophia electric
  178. Twisting the leads of filter choke
  179. This SPUD's 4 U
  180. I am Looking for tubes
  181. Thuan
  182. Nanjing 6V6GT ( 6P6P)
  183. Should I keep this old stuff?
  184. 300b
  185. ganged output transformers
  186. Holco H4P Resistors, Should I use them?
  187. 6BX8 curves, help !
  188. SANSUI AU-70 or 1000A???
  189. General Electric YTW-1 Tube Checker
  190. Ground or amp hum-which?
  191. need help to fix the "hiss" on my tube preamp
  192. Best SE interstage 1:1 for min. 15mA?
  193. Dual Single Ended Amplifier? - (not PSE)
  194. RIP Forum Member "Ivey"
  195. Balanced Buffer Needed with a Balanced Volume Control?
  196. valves to replace opamps in cd player
  197. Replacing capacitors on Audio Research D40 power amp.
  198. No sound and low B+?
  199. Replacing capacitors on Audio Research D40 power amp.
  200. 2 Channel Tube Amp and Sub Connection
  201. EZ125 Amp Project
  202. Yaqin MS-22b Phono Amp
  203. First post and a couple P.P. questions
  204. adding a preamp to tube power amp
  205. 6SN7 6N8S preamp suggestions
  206. 300b polarity
  207. Electrolytic capacitor vs extra triode stage
  208. WE JAN 274B Dating
  209. EICO 666 Tester Help
  210. Hickock 550X signal voltage
  211. First Headphone tube amp kit to build??
  212. Anyone owns a Dynavox VR-307 Amplifier ?
  213. NOS potted Chicago Transformer 1BC-150
  214. capacitor voltage for tube amp power supply
  215. 808 SE Design Help!
  216. Why can't I build my own ARC LS-5 or CJ PV-12?
  217. Post-mortem on a 80 year old 2A3 amp
  218. 6e5p gm70 with 6d22s?
  219. 6L6-6V6-EL34-KT88-6CA7-EL84
  220. Scheme for SE amp
  221. $16,000
  222. Hybrid power amp
  223. Diagnosis please
  224. On now! Jamerson's Ampeg
  225. BK 707 Tube Tester Mods
  226. monarch 614
  227. Separate Filament and B+ Switches
  228. Dynaco Low Power with 12AY7's
  229. PTP kits available?
  230. Which OP transformer and materials?
  231. Power of Tube Amp and Transistors Amp
  232. testing tubes
  233. current servo not voltage.
  234. Help Me, How to make Pre-amp using 12AU7 tube and Op-Amp Ic mix?
  235. 300b filament
  236. DHT SE auto bias circuit
  237. Anyone try swapping 6SN7 w/ 6F8G
  238. Eliminating Cathode Bypass Caps In SET Amplifier
  239. Nano vacuum tube
  240. Help High Line voltage
  241. Switchable Amp Output?
  242. PCB or hardwire?
  243. 27 line pre amplifier
  244. Mystery tubes on FB?
  245. amplifier discussion
  246. Mikael Abdellah KT88 SE with Cornet2
  247. 5879 to 12AX7 conversion
  248. CCDA SE output stage?
  249. Bravo V2 tube headphone amp - high pitched noise?
  250. Preamp Grounding Question

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