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  1. comparison of heater termination noise
  2. Some questions about an amplifier design
  3. 2nd harmonic feedback
  4. idea's for a valve preamp
  5. Best line stage tube?
  6. Bias Adjustment point
  7. Looking for a Williamson squematics
  8. Magnavox Console Speaker Impedances
  9. first tube amp
  10. Beam Triodes
  11. Winding output transformers
  12. Anyone Have a Schematic for Wavac MD300B?
  13. PushPull vs ParalelSE
  14. Painting transformer end bells
  15. all-octal schaded pp
  16. New Wood Chassis from Hammond
  17. Strange Noise From Amp
  18. Missing components
  19. Tube headphone amplifier.
  20. Emission - Double Triode
  21. Convergent Audio Technology - where is their Hompage?
  22. Mesh Plate
  23. Cathode follower question
  24. Power supply question
  25. Looking for a 866a powersupply schematic
  26. 211 or 845 project
  27. Modify Dynaco MKIII to use 6AR6s ?
  28. Yet another Dyna ST-70 Input Board
  29. Free Download Vacuum Tube Design Book
  30. driver stage for ppp 6550's
  31. power supply problem
  32. Positive/Negative Feedback
  33. Unholy Alliance Phono Amp
  34. Shrink a tube amp
  35. lampizator srpp help
  36. the secret of best preamplifier
  37. Any issues with adding a grounded power cord to a Heathkit IT-17 tube tester?
  38. HELP to ID push pull/Single Ende
  39. 12BH7,6414,and 12AT7 to drive EL34 better
  40. Testing Tube Amplifiers
  41. trade off higher HT current for lower filament current ?
  42. Any Russian analog of 12BY7 ?
  43. SV572-10 still being made?
  44. PP Output Transformer Testing Puzzle
  45. baby steps
  46. Partial FB: 2 SE + 1 PI = PP?
  47. G-807=807 SE or PP?
  48. 1Hz oscillation with CCS biased output valves
  49. Ultra-linear 6L6 output stage
  50. Transformer or capacitor coupling?
  51. Victor (JVC) Tube Amp MCM-200
  52. MiniWatt N3 problems, oscillation thumping and RF/motor problems.
  53. A2293 pins connection, help !!!
  54. Start-Up Delay for tube amp !
  55. Getting OPT in Japan?
  56. cathode follower tube buffer using 6n6p
  57. Buzz at output until tubes conduct
  58. I need help for amps.
  59. UL Connection results in higher distortion
  60. Header bypass Cap?
  61. DC heater large cap
  62. How to lower preamp output?
  63. Why use a pre amplifier
  64. DHT-buffered NOS-dac
  65. Microphonics 12AY7 v.s. 12AX7
  66. ECC99/2A3 interstage finished, but have one query
  67. Tube lovers in Germany?
  68. preamplifier
  69. Choosing grid leak resistor value -- partly subjective?
  70. What does the acronym "AMW" stand for?
  71. 6C33C distortion spectrum
  72. 6C33C OTL DC schematic needed
  73. help with identifying the cause of preamp problem
  74. Rosenblit 70w Mac amp
  75. Grounding scheme
  76. CC vs Shunt filament supply?
  77. Need opinions on boxing a dual mono line stage
  78. Lets settle the b+ on cold tubes issue!
  79. New 2A3 SET / Simple, but gentle sounding amplifier
  80. Magnavox Console Amp Chassis
  81. transformer identification
  82. 50Wrms audio amplifier
  83. 12B4 have a good sound ???
  84. almarro OPT question
  85. Best EL84pp kit??
  86. Clarion 6L6G Oscillator Amp.
  87. Did you hear an original tube sound?
  88. Designing an OTL / Circlotron
  89. Cayin A55t or AudioSpace AS-8i Mk.III
  90. filament voltage question
  91. 7236 vs 6AS7 ?
  92. Bias Circuit Calculation
  93. 6V6 Hum Issues
  94. Crossover co-axial
  95. Wurlitzer 6420 to audio amplifiers
  96. Advice on Parafeed Output Transformer
  97. mingda mc34ab mods?
  98. small and cheap OTL schematic needed
  99. ecl82 or ecl86 amplifier decision
  100. Well Here Goes... K16LS in Dynaco Chassis?
  101. Not too often you see one of those
  102. Sweet Peach vs Meng Yue EL84
  103. Attempt at giving back: 6L6GC SE amplifier
  104. Best Complete KT88 Amp Kit under $1K?
  105. Webcor Musicale OT puzzle
  106. Audio Research SP3a
  107. Preamp Conordīs with some malfunctioning
  108. Oscillating PSU above certain voltage
  109. B+ voltage load line question
  110. ming da tube amp smell
  111. Rebuilding my amp, would like some input.
  112. do any of these cv4024s seem genuine to you?
  113. Stupid question: EL34 tubes.
  114. PP with Unbalanced concertina = 2nd H?
  115. harmonic distortion
  116. Enhanced Tube's performance
  117. New GU50 SE: SRRP or Cascode for driver?
  118. Hivac XN11 tubes
  119. Conrad Johnson PV-10a hum. Any advice?
  120. Bob Carver's eye candy on eBay
  121. MFA Lumi started "motor-boating" today
  122. New GM70 tube with problem
  123. Interested in building together a 300B tube amp?
  124. cayin a-55t want to use el34
  125. Mc240
  126. Dht ?
  127. too much output impedance?
  128. College-proofing an ST-70 (aka autobias+ST-70)
  129. reverse polarity of the chinese goods?
  130. 6bg6 and 8k opt power amp project
  131. Need some calculation assist for a psu
  132. Baldwin Transformer Swap
  133. THD, s/n and IM noisy measurements
  134. Little dot 2+, got spark
  135. (INDIA) urgent - high-quality amp builders/techs in Delhi?
  136. What causes saturation in tubes?
  137. Plug and Play Power Supply
  138. GE 5814 and 12AUCIFTE
  139. Amplifier oscillates - advice sought
  140. 50s Amplifier
  141. power supply design question 832A amp
  142. Klimo power supply advice
  143. Earth Not Connected
  144. DC heater supply for phono pre
  145. Audio Note P2SE problem
  146. Aikido Transformers - Good Choice?
  147. Caps before or after MOSFET V-regulator
  148. Which capacitors should I replace?
  149. Testing Amplifiers
  150. Choosing choke valuein pre amp tube
  151. Supertriode with PNP transistors
  152. too much gain
  153. Lloyd's Vintage High Fidelity Audio Devices - both Tube and Solid State
  154. Cheap eBay "zoe_tsan" tube kits - worth anything?
  155. Bell Vintage High Fidelity Audio Devices - both Tube and Solid State
  156. Small Tube Amp with Hum
  157. tube rectifier question
  158. Unison Research S6 schematics
  159. vacuum tube amplifiers should be produced like this?
  160. 6d22s to 6cj3
  161. pot in tube preamp
  162. Mable Audio vs. Suppo audio sound quality
  163. swdfasdfsdf
  164. measuring heater voltage
  165. Need a circuit around these tubes.
  166. Single-Ended 13E1 amplifier
  167. Whats' the max allowable / reasonable ripple in SE amp?
  168. What amp kits are out there?
  169. ECC84/6N14P for audio
  170. PSU ignorant
  171. How to define a quality OT?
  172. Looking for some build advice
  173. ASC oil caps vs M-tube cap for ps
  174. SS CCS and distortion
  175. the valve with no markings
  176. Pentode AB1 design school???
  177. Capability of Sony/Tamradio SE Output Transformers
  178. my CELLINI triode amp
  179. 45-based SET -> Pass Labs F4
  180. Testing Amplifiers - Speaker or dummy load
  181. Quiet amp hums with signal source or input directly tied to star earth??
  182. amp output testing
  183. S5 Amp Comparison?
  184. How to Ground a Preamp PCB Board?
  185. RH807 / 6L6GC g2 issues
  186. 2010: Replacement for Black Gate WKZ 100uF+100uF 500V
  187. sunn solarus guitar amp
  188. Converting Dynaco ST70 Power Transformer for 12.6V
  189. Simple CF with 5687/6900/E182CC
  190. World Audio Design 5881 Schematic needed
  191. PP triode transformer load
  192. 6V6 PP load line
  193. Need help to under stand this 6n3 Kit from ebay
  194. Help:ampeg svt 2 pro 100v>>240v
  195. Blown left channel
  196. Tube preamp build help-heaters
  197. Medium Power SET, EL156 based
  198. Concertina Splitter question - Need help
  199. 6V6 amp - schematic options
  200. Lectron pa50+jh50
  201. 4pr60b valve
  202. Transformer phase splitter
  203. Help! ground hum
  204. Question regarding Leak Stereo 20 and 6SN7 line stage preamp
  205. Recommended upgrades for Yaqin Tube Buffer ?
  206. 6J5 or 6S4 mic amp?
  207. ST-70 build, ideas and advice
  208. Yaqin MC-100B Help Needed!
  209. Preamp Aikido : 6ax5GT,12au7,2c51
  210. Heater of tube
  211. R-Core Winders
  212. 1946 philco amp, tuner, record player
  213. otions for drawing tube schematics on Mac..?
  214. Push/Pull Plate Load Choke - how to figure Inductance?
  215. 6aw8-a tube question
  216. Newbie needs a point in the right direction
  217. Minimalist PL519 OTL?
  218. Telefunken schematics
  219. parallel pp EL84
  220. AD1 Operating Question
  221. 6П3С-Е Russian NOS: Gas Problem
  222. Favourite EL34 circuit
  223. Medium power SET with parallel OP tubes
  224. sds labs into Pas3
  225. Low voltage 6922 preamp...wanting a schematic
  226. Voltage Gain on Long Tailed Drivers
  227. Purpose of 5842 tube?!?
  228. MA XDSE KT88 vs YAQIN MC-100B KT88
  229. JBL Amplifier story
  230. Fender tweed pro-amp clone
  231. Recommended spacing for multiple 5AR4's
  232. Cap choices coupling
  233. Output transformer for PP EL34 source
  234. mini max pre
  235. use 2 ohm speakers
  236. Ask tube rect 5u4c and JJ caps
  237. Adding caps to prevent oscilation in AF 5687
  238. Williamson on EL84. Is it worth doing?
  239. CCS and regulated B+
  240. Garter cross-coupled feedback
  241. soundcard protection Z ???
  242. Using a CCS on SE Output Stage
  243. First amp build... help please!
  244. multiple independent grid biasing from 1 mosfet
  245. Eico HF-81 modification opinion
  246. 4K or 5K Output Transformer
  247. Noisy input on Michaelson & Austin TVA-1
  248. Precision Electronics S-35 help,
  249. Rogers Cadet 3 Problem
  250. Triode Electronics VS Hammond

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