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  1. David Berning's zh-230 - whats going on here?
  2. EICO HF86 scratch build question please
  3. what to do with a 12W 600ohm to 4/8 ohm output transformer?
  4. Telewatt VS71M
  5. Yamamoto 09S 300B SE Amp Problem
  6. Marantz-9
  7. 6V6 amp question
  8. Wood chassis
  9. My first project SE(T) into high end audio.
  10. Supermalloy for the Power transformer?
  11. Can I build a screen reg. with IXYS 10M45?
  12. Modified DynacoMkIV
  13. Refurbising Conrad Johnson Premier One
  14. Would using a 16ohm speaker damage my SE output transformers?
  15. Grommes/PE S-35 questions
  16. Concertina phase inverter with LED bias - is this completely wrong?
  17. Parafeed turn-on delay
  18. I'm looking for 6an8 (as V1) schematics
  19. New Project - EL84 PP and preamp - suggestions welcome
  20. The sound of modern transformers compared with vintage gear
  21. Determining the core cross sectional area, Afe, for SE OPT
  22. HT power supply high?
  23. under-run push pull
  24. 12B4 Linestage Woes
  25. Transcendent Sound Mini-Beast
  26. A Question About Positive Feedback
  27. Help with opera consonance M100plus
  28. Just received 2x PT Choke OT. best implementation ?
  29. Just received 2x PT Choke OT. best implementation ?
  30. Mystery Valve ID
  31. Oddball OT with extra secondary winding
  32. Help with Multi Section Can Cap replacement
  33. 600V bench variable supply to test transmitting valves
  34. Heater-cathode voltage spec interpretation
  35. Tell me why this wont work.
  36. headphone amp for Senns HD600
  37. Transformer orientation and suggestions.
  38. 12AU7 stereo SE mini-amp build!
  39. allen type 20a schematic
  40. 2010 lemon year for EH 6922 tubes
  41. Chinese GU50 PP
  42. Gain, Vpp and attenuation at each stage
  43. 6n14p headphone amp
  44. Heater Lifter
  45. KT88 & 6550 Pentode power output?
  46. Biasing Improved Williamson
  47. Lowering the Volume Control on Tube Amps
  48. Got the Hum out!! Thanks All
  49. How hot KT88 get? Anybody take a reading?
  50. Broskie Unbalancer
  51. Phase splitting transformer design
  52. Red plate KT88
  53. 6N16B preamp
  54. Eimac 450th nos
  55. how much clearance above tubes for KT88 enclosure
  56. Cathode preheating???
  57. RIAA Question - Power
  58. Linearity of Red RCA 5692
  59. What gauge enclosure for KT88 AMP?
  60. Output Transformer Issue???
  61. Maggie 8802 placement issue
  62. 6550 tube protection socket
  63. PT laminations are usable as OT laminations ?
  64. Are These Authentic Russian Military 1578 Vacuum Tubes?
  65. Amp ID Please
  66. Help for Main Transformer Spec for CCDA
  67. Switching SE and balanced inputs/outputs
  68. kt88 PP rectifier.
  69. How much Blue glow is ok?
  70. Recommendations on How To mono a pre amplifier?
  71. 6H6pi curves available?
  72. 1p24b
  73. help, Built from scratch Kalamazoo 2 noise
  74. 5CZ5/5BQ7A single ended amp
  75. Hopefully a simple question.
  76. 211 tube recommendations
  77. Need HELP with TUBE IMP
  78. Another unknown tube
  79. Triode Bias 101
  80. Bogen MO-200A transplant /conversion
  81. 5U4 o bridge rectifier
  82. Choosing the right transformer
  83. V-Cap Help
  84. Older tubes sound better
  85. 6J7 preamp
  86. Menygue mini/music angel amp
  87. Driving a Behringer INuke Nu1000
  88. cathode follower ecc88 on 60volt
  89. Docs for Heathkit AA-23?
  90. 45 tube amp schematic
  91. Old TO-R s15u, Should i fix it?
  92. Tube ID
  93. VTL driver tube question
  94. Fun with junk EL84 SE
  95. Enclosure ideas
  96. Burn in procedure for NOS necessary?
  97. Strange Lorenz ECC81 12AT7
  98. Amplifier first start up; Plays tone of signal generator with no speakers!
  99. Reports of the death of Audiophool have been greatly exaggerated
  100. help me identify some vintage tubes // need suggestions for possible applications!
  101. Lowering cost of audio output transformer
  102. Source for transformers in Europe
  103. morgan Jones HT caps & Anode Loads
  104. Tuning Negative feedback
  105. SET-NO FEEDBACK amplifier performance
  106. Stereo class A 6+6W - 2x 6L6G 1 x 6N2P
  107. Console Amplifier Pull:Voltages over Spec
  108. Help! My EL34B based amp arced at full volume.
  109. MUZAK 50's tube amp
  110. Tube break-in?
  111. Custom power tranny specs recommendations for 300B pse monoblocs
  112. mosfet source follower output stage.
  113. Winter upgrade project - new heating unit
  114. 6KM8 amp
  115. Power and output transformers to ground.
  116. Help with this schematic? B+? B++?
  117. What to do with this old amp? suggestions please.
  118. DIY CAT SL1 preamp
  119. Phase inverter, your comments welcomed!
  120. Basic Bias Question for PP Amp
  121. Oddwatt 5751/6550
  122. Please help me to identify Telefunken PCC ...
  123. Modification of 300B SE Amplifier
  124. 300B Tube and Amp Questions
  125. ST70 "Imposter"
  126. cathode follower question
  127. marconi tubes....can someone idntify these
  128. DeathTrap400 : : A Pretty Damn Good 300B Amp
  129. SOS: First Build, Lots of Hum
  130. KR Audio Marconi R valve amp?
  131. Distortion
  132. Tung-Sol 6098/6AR6 Substitution
  133. Dropout in RTP3 phono stage
  134. Audio Research EC-3 modification
  135. 300b all-DHT SET
  136. My first tube project !
  137. Trouble with homebuilt amp
  138. Music angel el34b problem
  139. The end of tubes?
  140. Two stages EL34 power amplifier
  141. 7199 replacement in AMPEX 6973
  142. IT coupled tube-SS hybrid amp suggestion- needs development
  143. Original Cary CAD-300se upgrades?
  144. Convert Integrated Tube Preamp to an amplifier
  145. McCurdy AM405 Schematics
  146. Looking for Neumann N149 power supply schematic
  147. Behringer DEQ2496 for testing amplifiers and preamps frequency response ???
  148. I need datasheet of 8753 tube, help me!
  149. New 6L6GC Project. DC -> LTP
  150. EL84 in UL
  151. 1953 revere amp conversion
  152. Manley transformer specifications
  153. Recommended 300B SE Amplifier Designs
  154. Found a new interstage coupling method (?)
  155. Amplifier Distortion (Northern Electric)
  156. when do filament supplies need to be floated
  157. gm70 filiment transformers
  158. Replacing 6922 Preamp Tube in ARC LS7
  159. Please educate me: Tube testing, the life test, and Grid Leakage
  160. 6AR6 6098 Triode PP Load Line
  161. music reference rm5-4 schematics
  162. S5 K-12G output trans
  163. Transformer center tap question
  164. EF86 + 4*EL84PSE
  165. solid state relays for plate load switching?
  166. Dont have a power transformer?
  167. Kora Equinoxe Triode or Blue Circle BC-21.1 preamp?
  168. Power Transformer Help
  169. Analog Metric 2A3 PP Kit
  170. Good, starter OTL kit
  171. Dual SE amplifier? - (not PSE) - Take two!
  172. Mysterious SE OTL headphone amp from China?!
  173. Inv. Futterman with gain stages between PI and O/P?
  174. PSU configurations for tube amp
  175. HP Model 712b Regulated Power supply
  176. Dynaco low Power Amp
  177. 300b power suply
  178. Very Strange Preamp Issue
  179. WTB: I am looking for a Freed 1400V or Chicago 1200V/1400V Potted Power Transformer
  180. tube transformer suppliers in Mercosur
  181. Please Help: 6CJ3 Damper Diode Tube as Rectifier Question
  182. time delay sophia electric
  183. Twisting the leads of filter choke
  184. This SPUD's 4 U
  185. I am Looking for tubes
  186. Thuan
  187. Nanjing 6V6GT ( 6P6P)
  188. Should I keep this old stuff?
  189. 300b
  190. ganged output transformers
  191. Holco H4P Resistors, Should I use them?
  192. 6BX8 curves, help !
  193. SANSUI AU-70 or 1000A???
  194. General Electric YTW-1 Tube Checker
  195. Ground or amp hum-which?
  196. need help to fix the "hiss" on my tube preamp
  197. Best SE interstage 1:1 for min. 15mA?
  198. Dual Single Ended Amplifier? - (not PSE)
  199. RIP Forum Member "Ivey"
  200. valves to replace opamps in cd player
  201. Replacing capacitors on Audio Research D40 power amp.
  202. No sound and low B+?
  203. Replacing capacitors on Audio Research D40 power amp.
  204. 2 Channel Tube Amp and Sub Connection
  205. EZ125 Amp Project
  206. Yaqin MS-22b Phono Amp
  207. First post and a couple P.P. questions
  208. adding a preamp to tube power amp
  209. 6SN7 6N8S preamp suggestions
  210. 300b polarity
  211. Electrolytic capacitor vs extra triode stage
  212. WE JAN 274B Dating
  213. EICO 666 Tester Help
  214. Hickock 550X signal voltage
  215. First Headphone tube amp kit to build??
  216. NOS potted Chicago Transformer 1BC-150
  217. capacitor voltage for tube amp power supply
  218. 808 SE Design Help!
  219. Why can't I build my own ARC LS-5 or CJ PV-12?
  220. Post-mortem on a 80 year old 2A3 amp
  221. 6e5p gm70 with 6d22s?
  222. 6L6-6V6-EL34-KT88-6CA7-EL84
  223. Scheme for SE amp
  224. $16,000
  225. Hybrid power amp
  226. Diagnosis please
  227. monarch 614
  228. Separate Filament and B+ Switches
  229. Dynaco Low Power with 12AY7's
  230. PTP kits available?
  231. Which OP transformer and materials?
  232. Power of Tube Amp and Transistors Amp
  233. testing tubes
  234. current servo not voltage.
  235. Help Me, How to make Pre-amp using 12AU7 tube and Op-Amp Ic mix?
  236. 300b filament
  237. DHT SE auto bias circuit
  238. Anyone try swapping 6SN7 w/ 6F8G
  239. Eliminating Cathode Bypass Caps In SET Amplifier
  240. Nano vacuum tube
  241. Help High Line voltage
  242. Switchable Amp Output?
  243. PCB or hardwire?
  244. 27 line pre amplifier
  245. Mystery tubes on FB?
  246. amplifier discussion
  247. Mikael Abdellah KT88 SE with Cornet2
  248. 5879 to 12AX7 conversion
  249. CCDA SE output stage?
  250. Bravo V2 tube headphone amp - high pitched noise?

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