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  1. Audio innovations 500 capacitor replacement
  2. CCS on Loftin White driver?
  3. Any guesses on this tube
  4. Current best DIY preamp?
  5. Left my amp on without speaker for hours
  6. Sphinx Projekt Four Tube preamp schematic
  7. Question on interstage transformer with class D drive
  8. Success or problems with ferrite beads / rings as stoppers?
  9. turn an OPamp design into a tube one
  10. Troubleshooting Sansui AU-70 preamp hum
  11. Soviet 6V6 tube question
  12. Battery powered Subminiature tube amp for high Z headphones
  13. Build Log: P Millett's DCPP "Engineer's Amp"
  14. Pilot Preamp
  15. SS->Vacuum Tube Hybrid Test - Insane but worked
  16. I hope this is the right forum... big amp with output xformers
  17. Aikido PH-1 Phono Stage and PS-1 Project.
  18. I need someone with a tube-tester in the Greater Boston area...
  19. Why is this a buffer?
  20. Looking for schematic: Radii Audio MPP6BM8S
  21. Dual 9-pin Triode 12ax7 and 12au7
  22. Power supply for a limited bandwith SE amp
  23. Using a relay to protect the output valve if grid bias supply fails
  24. Yuan jing 6n3 tube preamplifier - silly blue lights / leds
  25. Push Pull Class A OPT design
  26. attenuator for negative feedback help
  27. Cary Audio 300b se amp
  28. Inductor coupled Preamp
  29. Johan Potgieter's Hallé
  30. My adventures with shunt regulators
  31. Luxman MQ68C tube substitution - potential for Screen Drive?
  32. Antique Sound Lab AQ-1001DT woes
  33. Mystery tubes?
  34. QE08/200-D3a Se-ClassA-Triode connected
  35. Bias servo for class AB
  36. Shine7 E88CC Tube Preamp
  37. El Cheapo Amp Power Supply Questions
  38. Sub 8068 for 807 in series pass
  39. Bias trim calculation spreadsheet
  40. SHAX project - the true flea-power... though a true PP Amp too
  41. KT120 producers: only TUNG SOL?
  42. How to reduce Gain? 1st stage Triode
  43. SS voltage regulator kit
  44. Tube circuit drawing software ?
  45. How to connect a pentode in tetrode mode?
  46. weird centertap connection
  47. Loss 4.5dB at DC coupling RIAA filter
  48. Help with drawing load lines for 45 output stage
  49. Tubes glowing pulsing. is this a problem?
  50. Can I convert self bias to Fixed?
  51. Floating ground dual class amplification A + B/C/D/etc...
  52. Misty- SE 1625 Triode Strapped- Newest Build
  53. Identification of Amperex 12AX7A ECC83
  54. EL34 plate voltage & biasing current.
  55. Douk Audio U202 headphone amplifier - real or fake tube amplification?
  56. 2A3 vs 300B Stuck at a fork in the road.
  57. New tube DIY'er with an HK A300
  58. 2 Half Wave Rectifiers vs 1 Full Wave Rec
  59. JE Labs 76 6sn7
  60. Audioramy 828A/FU29 still mains hum after ground lift
  61. The ISO-Tango transformers reborn in ISO Transformers
  62. 6922/6DJ8 Operating Point???
  63. VTV Octal (6SN7) Line Stage Build --> Mod
  64. TL10/KT61
  65. Anyone recognize this transformer manufacturer?
  66. A look at some Electrophoresis HV power supplies
  67. What wire to use for top caps (plate voltage)?
  68. Help with class A hybrid headphone amp project
  69. 6P1P, LM317 CCS cathode bias weird issue.
  70. Newb question on Cathodyne Phase Inverter
  71. 6080 regulator
  72. Reworking 6SN7 Line Stage Preamp
  73. Copper belly belt on SE OPT
  74. The Tube Fates Have Smiled Upon Me
  75. 25DN6 Magnet
  76. Driver tube recommendation
  77. HF-87 Rebuild help
  78. Odd Watt Audio Alpha Build and initial review
  79. Need Help by e80cc tube premp
  80. scott 299d phono tubes
  81. Bare bones first tube "build"
  82. Theory of Western Electric Harmonic Balancer explained
  83. Telefunken EB III
  84. Odd issue with first turn-on
  85. help for new project
  86. Identifying Svetlana KT88 tubes
  87. Life span of 6AU4GTA?
  88. K-12G Edcor Power Trans. upgrade issue
  89. Help about tube
  90. Mod 805 based amp without anode cap
  91. 6MD8 triple triode utilizing separate bias
  92. Help find a valve power amp project
  93. Capable Electronics Advice required please
  94. 813 Filament Question
  95. Aikido LV: Wall wart ripple & rc filter
  96. Solid state current limiters instead of screen resistors
  97. Opinions wanted…..
  98. Hadley small potted transformers help to identify
  99. A Bit of Confusion Over Berning EA 230 Output Transformers/6JN6 Push-Pull
  100. Antenna Lead Directly to Plate of Detector Tube
  101. Amplion Amplifier
  102. Tube ID
  103. Heathkit Transformers for 7591 Amp, opinions wanted
  104. Noise and oscillation problem ECC802S pre
  105. Mains transformer Secondary 0v grounding
  106. dirty sound
  107. Toroid.pl SE transformers any good?
  108. Filament tap for 5y3
  109. 6SN7 Linestage with 6EM7 Regulation
  110. Beginner looking for first build- 4x EL34/12ax7
  111. Cayin SC-10
  112. How to apply local feedback
  113. Haltron 6V6GT who made these?
  114. Conjunctive filter question.
  115. Audio reserach ref 3 hiss and pops/Lampizator
  116. crossover distortion and other questions (first timer)
  117. Peters Mighty Midget tube amp
  118. Electro/Mechanical Volume Switch
  119. 6L6 quad push pull monoblock project
  120. Advice on 6550's
  121. Question on OPT secondary impedance selectors
  122. New Tube Amp Problem (help plz!)
  123. Sansui 500a. Restore or?
  124. 3B28 DC filament current?
  125. AMC CVT-3030 shooting from speakers, blowing fuse
  126. Linkwitz transform w. tubes?
  127. 6SL7 in SRPP w/o heater elevation
  128. McIntosh C20 Volume pot help
  129. Audio Research Classic 150 mono-bloc
  130. 300B filament outage
  131. Lab mains transformer?
  132. Differential amplifier with DH tubes
  133. My CJ PV2AR pre - why did they sub these transistor diodes in ?
  134. PS Transformer Wiring: Aikido PH-1 + PS-1
  135. SE807 Triode Dick Amplifier Questions
  136. Is it sufficient. voltage source vs tranny model in LTSpice??
  137. HV tube for A1 low mA
  138. Audio Research D150 hardwiring
  139. Pi Filter before Shunt Regulator?
  140. Improvements in this riaa tube
  141. SRPP preamp - Rk calculation
  142. SE output with PP transformer
  143. External CCS
  144. Testing tubes some simple way?
  145. Is ECC86/6GM8 a Direct Plug-In Swap for ECC88/6DJ8 (@ 30
  146. 8106 Tubes
  147. using old tubes first time
  148. A reasonable way to use these bits and pieces?
  149. Engineer's Amplifier transformers
  150. Yaqin MC100B Dead, need help
  151. Question on tube substitution
  152. Reaching max Rect. Current and amp needs more gain.
  153. HELP: Converting amp to accommodate 12AU7 and 6CG7
  154. Need Assistance with Carver Classic Tube Preamp
  155. 807 Sound Quality?
  156. LITZ output trafo
  157. Need help running this LTSPICEXV11 Model
  158. White cathode follower driver needed
  159. DMLS and vacuum tube manufacture
  160. Drive and bias with CF?
  161. Mullard 3-3 DIY Amplifier
  162. Wright Mono 8 Schematic & Operating Points
  163. 5R4GY 1'st cap size
  164. Request help on low voltage hybrid amp
  165. Cool rain spouts for GM70
  166. cheapest tubes ?
  167. Tube n00b headphone amp?
  168. found tubes
  169. Adding a volume pot to tube power amp
  170. Channel Master 6601 integrated phasing mystery
  171. (yet another) request for advice on beginner 2a3 build
  172. OPT for 845 tube
  173. Live Amp Testing: Short created with scope lead?
  174. Beard P101
  175. Potted Transformers - days gone past?
  176. KT88 pp monobloc thoughts
  177. Ampex Mono 6973 Bias
  178. Dominant Pole across phases
  179. 6SN7 low plate voltage for lower gain?
  180. FB to split cathode resistor
  181. 6n23p (and similar) low output impedance preamp
  182. a couple cable driving questions...
  183. SMPS for filament heating of power triodes?
  184. Mullard Execution
  185. Need help with output transformer
  186. Trying to get my bearings on LTP & feeling like a dummy
  187. Preamp planning
  188. Odd motorboating in old stereo amp
  189. New pp EL84 designs
  190. 845 SET amp recommendations
  191. SVP and FVP preamp builders
  192. Input Vol. control (parallel 2M + 2M resistor) squeals and hums at less than 100%
  193. Bucking secondaries
  194. Transformer-Coupled Input Grounding
  195. Power Transformers
  196. GM70 SE direct coupled sanity check 1st design
  197. 6n16b buffer on a nakamichi cdp
  198. Lost surplus parts links to computer crash
  199. Tube amp with no power switch
  200. Scott 299D tubes
  201. Weird Blue Line on an EL84
  202. Chassis Layout Question
  203. Filament supply ARC D115mk2
  204. VT25A PP OPT TRIBUTE 20Kpp
  205. GE 7233 NOS matched pair
  206. Fisher SA-100
  207. Question about plate load resistor with slight change in value
  208. Schematic for SET amp with RCA 5654 tubes.
  209. Pete Millett's new VFD based headphone amp and buffer
  210. fixed bias differential pair with grounded cathode in preamp?
  211. KT88 or EL34 hi-fi PP ultralinear schematic
  212. SPICE circuits for classic designs
  213. A differential input low distortion pre-amplifer concept
  214. Citation II Meets Scott LK72
  215. 6BK4C at reasonable B+
  216. 6P3S-E gold grid?
  217. Back to roots...
  218. Tube rectifier and PT without center tap
  219. 8045G power triode
  220. 5998/421A build and schematic feedback wanted
  221. Scott 299A Rebuild
  222. 10M90S as replacement for pentode.
  223. Comments on this phono preamp?
  224. Trim-pots for KT88 Bias adjustments
  225. silicon drive with direct coupling
  226. What would a blameless SE amp look like?
  227. 6L6GC ul data sheet
  228. Tweeter of different impedence
  229. 70v distribution transformer for OPT
  230. Resistor Values for LINEAR Ladder Attenuator (not series Attenuator)
  231. solderless amplifier?
  232. Planning 6sn7 Aikido build
  233. Need help with Yaqin Spark 550
  234. anyone near eastbourne E/sussex to rescue my build please?
  235. 50s 6AS7 RCA amp project
  236. picked up three little amps
  237. Hum And ceramic tube sockets?
  238. Please review my 6J1 6AK5 Pedja buffer circuit
  239. Dynaco st 70 - pops fuse
  240. Type 82 mercury rectifiers
  241. Is 6J51P fit to drive a EL34SE?
  242. Modeling Fi Primer 300B with LTSpice
  243. Please check my biasing numbers/methodology (EL34)
  244. yet another Antique Sounds 1006 845 SET
  245. Transformers, Marshall JTM45/100 Style 100W Output Transformer or Edcor CXPP100-4.2K
  246. Which VR Tube Option is Least Noisy
  247. Hybrid cascodes: does the tube actually matter?
  248. EL34 - 40W PCB
  249. Dynaco 6V6 Can replace 6SN7 with 6SL7?
  250. Separate power supplies for power and pre/driver tubes

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