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  1. Heathkit ol-1 oscilloscope help. Can't get solid spot during setup procedure.
  2. Operating a stereo amp in bridged mode
  3. Mic input Transformer from Triode Elect
  4. Power transformer for tube amp requirements
  5. Tape playback amp
  6. Tube for high input Z
  7. Eico 666 tube tester restoration - need grid control!
  8. Need Schematic/Manual Lambda 71
  9. Replace ECC83 preamp valve with E88CC(6922)
  10. Advice on 6P3S p-p amp schematic, feedback problem?
  11. 6S41S P-P Amp Initial Query
  12. El Cheapo, builders thread
  13. kbu608 rectifier
  14. Looking for nice sounding amp project
  15. B+ for EL84
  16. Output Transformer kt88 6550 pp, Wires? Jukebox? Help.
  17. OPT with foil secondaries
  18. Small Tube Pre Amp - Power Supply Cable
  19. Identification of unknown output transformer
  20. master volume with a extra tube
  21. 10 pounds of power for $15
  22. Unstable Eico HF-87
  23. DIY Dual Channel Active Tube Tone Control
  24. cant eliminate 50hz hum on just one side of the 6h6p headphoneamp
  25. question about the 866a
  26. Trade Custom Speaker Horns for Custom Amp
  27. TVA-1 valve amp - help
  28. Need to source a PSU chassis - simple steel
  29. What should I do with my Dynaco MKIII's
  30. inrush current
  31. Scott 222B output transformer : Compatibility and specs
  32. C3G/C3M Prices
  33. 5v3, 5u4, 5u4gb, 5u4gbm, 5931?
  34. transformer for quad EL84 SE amp - will Antek 360v work
  35. Best Possible Tube Headphone Amp
  36. Help with cheap mono SE
  37. Millkido 24
  38. 60W mono's design help
  39. Psu question - best place for the caps?
  40. 1.2W guitar amp useing:6N2P and 6N1P russian tubes.
  41. RCA jacks
  42. Hickok 530-B tester charts wanted
  43. comparison of heater termination noise
  44. Some questions about an amplifier design
  45. 2nd harmonic feedback
  46. idea's for a valve preamp
  47. Best line stage tube?
  48. Bias Adjustment point
  49. Looking for a Williamson squematics
  50. Magnavox Console Speaker Impedances
  51. first tube amp
  52. Beam Triodes
  53. Winding output transformers
  54. Anyone Have a Schematic for Wavac MD300B?
  55. PushPull vs ParalelSE
  56. Painting transformer end bells
  57. all-octal schaded pp
  58. New Wood Chassis from Hammond
  59. Strange Noise From Amp
  60. Missing components
  61. Tube headphone amplifier.
  62. Emission - Double Triode
  63. Convergent Audio Technology - where is their Hompage?
  64. Mesh Plate
  65. Cathode follower question
  66. Power supply question
  67. Looking for a 866a powersupply schematic
  68. 211 or 845 project
  69. Modify Dynaco MKIII to use 6AR6s ?
  70. Yet another Dyna ST-70 Input Board
  71. Free Download Vacuum Tube Design Book
  72. driver stage for ppp 6550's
  73. power supply problem
  74. Positive/Negative Feedback
  75. Unholy Alliance Phono Amp
  76. Shrink a tube amp
  77. lampizator srpp help
  78. the secret of best preamplifier
  79. Any issues with adding a grounded power cord to a Heathkit IT-17 tube tester?
  80. HELP to ID push pull/Single Ende
  81. 12BH7,6414,and 12AT7 to drive EL34 better
  82. Testing Tube Amplifiers
  83. trade off higher HT current for lower filament current ?
  84. Any Russian analog of 12BY7 ?
  85. SV572-10 still being made?
  86. PP Output Transformer Testing Puzzle
  87. baby steps
  88. Partial FB: 2 SE + 1 PI = PP?
  89. G-807=807 SE or PP?
  90. 1Hz oscillation with CCS biased output valves
  91. Ultra-linear 6L6 output stage
  92. Transformer or capacitor coupling?
  93. Victor (JVC) Tube Amp MCM-200
  94. MiniWatt N3 problems, oscillation thumping and RF/motor problems.
  95. A2293 pins connection, help !!!
  96. Start-Up Delay for tube amp !
  97. Getting OPT in Japan?
  98. cathode follower tube buffer using 6n6p
  99. Buzz at output until tubes conduct
  100. I need help for amps.
  101. UL Connection results in higher distortion
  102. Header bypass Cap?
  103. DC heater large cap
  104. How to lower preamp output?
  105. Why use a pre amplifier
  106. DHT-buffered NOS-dac
  107. Microphonics 12AY7 v.s. 12AX7
  108. ECC99/2A3 interstage finished, but have one query
  109. Tube lovers in Germany?
  110. preamplifier
  111. Choosing grid leak resistor value -- partly subjective?
  112. What does the acronym "AMW" stand for?
  113. 6C33C distortion spectrum
  114. 6C33C OTL DC schematic needed
  115. help with identifying the cause of preamp problem
  116. Rosenblit 70w Mac amp
  117. Grounding scheme
  118. CC vs Shunt filament supply?
  119. Need opinions on boxing a dual mono line stage
  120. Lets settle the b+ on cold tubes issue!
  121. New 2A3 SET / Simple, but gentle sounding amplifier
  122. Magnavox Console Amp Chassis
  123. transformer identification
  124. 50Wrms audio amplifier
  125. 12B4 have a good sound ???
  126. almarro OPT question
  127. Best EL84pp kit??
  128. Clarion 6L6G Oscillator Amp.
  129. Did you hear an original tube sound?
  130. Designing an OTL / Circlotron
  131. Cayin A55t or AudioSpace AS-8i Mk.III
  132. filament voltage question
  133. 7236 vs 6AS7 ?
  134. Bias Circuit Calculation
  135. 6V6 Hum Issues
  136. Crossover co-axial
  137. Wurlitzer 6420 to audio amplifiers
  138. Advice on Parafeed Output Transformer
  139. mingda mc34ab mods?
  140. small and cheap OTL schematic needed
  141. ecl82 or ecl86 amplifier decision
  142. Well Here Goes... K16LS in Dynaco Chassis?
  143. Not too often you see one of those
  144. Sweet Peach vs Meng Yue EL84
  145. Attempt at giving back: 6L6GC SE amplifier
  146. Best Complete KT88 Amp Kit under $1K?
  147. Webcor Musicale OT puzzle
  148. Audio Research SP3a
  149. Preamp Conordīs with some malfunctioning
  150. Oscillating PSU above certain voltage
  151. B+ voltage load line question
  152. ming da tube amp smell
  153. Rebuilding my amp, would like some input.
  154. do any of these cv4024s seem genuine to you?
  155. Stupid question: EL34 tubes.
  156. PP with Unbalanced concertina = 2nd H?
  157. harmonic distortion
  158. Enhanced Tube's performance
  159. New GU50 SE: SRRP or Cascode for driver?
  160. Hivac XN11 tubes
  161. Conrad Johnson PV-10a hum. Any advice?
  162. Bob Carver's eye candy on eBay
  163. MFA Lumi started "motor-boating" today
  164. New GM70 tube with problem
  165. Interested in building together a 300B tube amp?
  166. cayin a-55t want to use el34
  167. Mc240
  168. Dht ?
  169. too much output impedance?
  170. College-proofing an ST-70 (aka autobias+ST-70)
  171. reverse polarity of the chinese goods?
  172. 6bg6 and 8k opt power amp project
  173. Need some calculation assist for a psu
  174. Baldwin Transformer Swap
  175. THD, s/n and IM noisy measurements
  176. Little dot 2+, got spark
  177. (INDIA) urgent - high-quality amp builders/techs in Delhi?
  178. What causes saturation in tubes?
  179. Plug and Play Power Supply
  180. GE 5814 and 12AUCIFTE
  181. Amplifier oscillates - advice sought
  182. 50s Amplifier
  183. power supply design question 832A amp
  184. Klimo power supply advice
  185. Earth Not Connected
  186. DC heater supply for phono pre
  187. Audio Note P2SE problem
  188. Aikido Transformers - Good Choice?
  189. Caps before or after MOSFET V-regulator
  190. Which capacitors should I replace?
  191. Testing Amplifiers
  192. Choosing choke valuein pre amp tube
  193. Supertriode with PNP transistors
  194. too much gain
  195. Lloyd's Vintage High Fidelity Audio Devices - both Tube and Solid State
  196. Cheap eBay "zoe_tsan" tube kits - worth anything?
  197. Bell Vintage High Fidelity Audio Devices - both Tube and Solid State
  198. Small Tube Amp with Hum
  199. tube rectifier question
  200. Unison Research S6 schematics
  201. vacuum tube amplifiers should be produced like this?
  202. 6d22s to 6cj3
  203. pot in tube preamp
  204. Mable Audio vs. Suppo audio sound quality
  205. swdfasdfsdf
  206. measuring heater voltage
  207. Need a circuit around these tubes.
  208. Single-Ended 13E1 amplifier
  209. Whats' the max allowable / reasonable ripple in SE amp?
  210. What amp kits are out there?
  211. ECC84/6N14P for audio
  212. PSU ignorant
  213. How to define a quality OT?
  214. Looking for some build advice
  215. ASC oil caps vs M-tube cap for ps
  216. SS CCS and distortion
  217. the valve with no markings
  218. Pentode AB1 design school???
  219. Capability of Sony/Tamradio SE Output Transformers
  220. my CELLINI triode amp
  221. 45-based SET -> Pass Labs F4
  222. Testing Amplifiers - Speaker or dummy load
  223. Quiet amp hums with signal source or input directly tied to star earth??
  224. amp output testing
  225. S5 Amp Comparison?
  226. How to Ground a Preamp PCB Board?
  227. RH807 / 6L6GC g2 issues
  228. 2010: Replacement for Black Gate WKZ 100uF+100uF 500V
  229. sunn solarus guitar amp
  230. Converting Dynaco ST70 Power Transformer for 12.6V
  231. Simple CF with 5687/6900/E182CC
  232. World Audio Design 5881 Schematic needed
  233. PP triode transformer load
  234. 6V6 PP load line
  235. Need help to under stand this 6n3 Kit from ebay
  236. Help:ampeg svt 2 pro 100v>>240v
  237. Blown left channel
  238. Tube preamp build help-heaters
  239. Medium Power SET, EL156 based
  240. Concertina Splitter question - Need help
  241. 6V6 amp - schematic options
  242. Lectron pa50+jh50
  243. 4pr60b valve
  244. Transformer phase splitter
  245. Help! ground hum
  246. Question regarding Leak Stereo 20 and 6SN7 line stage preamp
  247. Recommended upgrades for Yaqin Tube Buffer ?
  248. 6J5 or 6S4 mic amp?
  249. ST-70 build, ideas and advice
  250. Yaqin MC-100B Help Needed!

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