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  1. How to lower preamp output?
  2. Why use a pre amplifier
  3. DHT-buffered NOS-dac
  4. Microphonics 12AY7 v.s. 12AX7
  5. ECC99/2A3 interstage finished, but have one query
  6. Tube lovers in Germany?
  7. preamplifier
  8. Choosing grid leak resistor value -- partly subjective?
  9. What does the acronym "AMW" stand for?
  10. 6C33C distortion spectrum
  11. 6C33C OTL DC schematic needed
  12. help with identifying the cause of preamp problem
  13. Rosenblit 70w Mac amp
  14. Grounding scheme
  15. CC vs Shunt filament supply?
  16. Need opinions on boxing a dual mono line stage
  17. Lets settle the b+ on cold tubes issue!
  18. New 2A3 SET / Simple, but gentle sounding amplifier
  19. Magnavox Console Amp Chassis
  20. transformer identification
  21. 50Wrms audio amplifier
  22. 12B4 have a good sound ???
  23. almarro OPT question
  24. Best EL84pp kit??
  25. Clarion 6L6G Oscillator Amp.
  26. Did you hear an original tube sound?
  27. Designing an OTL / Circlotron
  28. Cayin A55t or AudioSpace AS-8i Mk.III
  29. filament voltage question
  30. 7236 vs 6AS7 ?
  31. Bias Circuit Calculation
  32. 6V6 Hum Issues
  33. Crossover co-axial
  34. Wurlitzer 6420 to audio amplifiers
  35. Advice on Parafeed Output Transformer
  36. mingda mc34ab mods?
  37. small and cheap OTL schematic needed
  38. ecl82 or ecl86 amplifier decision
  39. Well Here Goes... K16LS in Dynaco Chassis?
  40. Not too often you see one of those
  41. Sweet Peach vs Meng Yue EL84
  42. Attempt at giving back: 6L6GC SE amplifier
  43. Best Complete KT88 Amp Kit under $1K?
  44. Webcor Musicale OT puzzle
  45. Audio Research SP3a
  46. Preamp Conordīs with some malfunctioning
  47. Oscillating PSU above certain voltage
  48. B+ voltage load line question
  49. ming da tube amp smell
  50. Rebuilding my amp, would like some input.
  51. do any of these cv4024s seem genuine to you?
  52. Stupid question: EL34 tubes.
  53. PP with Unbalanced concertina = 2nd H?
  54. harmonic distortion
  55. Enhanced Tube's performance
  56. New GU50 SE: SRRP or Cascode for driver?
  57. Hivac XN11 tubes
  58. Conrad Johnson PV-10a hum. Any advice?
  59. Bob Carver's eye candy on eBay
  60. MFA Lumi started "motor-boating" today
  61. New GM70 tube with problem
  62. Interested in building together a 300B tube amp?
  63. cayin a-55t want to use el34
  64. Mc240
  65. Dht ?
  66. too much output impedance?
  67. College-proofing an ST-70 (aka autobias+ST-70)
  68. reverse polarity of the chinese goods?
  69. 6bg6 and 8k opt power amp project
  70. Need some calculation assist for a psu
  71. Baldwin Transformer Swap
  72. THD, s/n and IM noisy measurements
  73. Little dot 2+, got spark
  74. (INDIA) urgent - high-quality amp builders/techs in Delhi?
  75. What causes saturation in tubes?
  76. Plug and Play Power Supply
  77. GE 5814 and 12AUCIFTE
  78. Amplifier oscillates - advice sought
  79. 50s Amplifier
  80. power supply design question 832A amp
  81. Klimo power supply advice
  82. Earth Not Connected
  83. DC heater supply for phono pre
  84. Audio Note P2SE problem
  85. Aikido Transformers - Good Choice?
  86. Caps before or after MOSFET V-regulator
  87. Which capacitors should I replace?
  88. Testing Amplifiers
  89. Choosing choke valuein pre amp tube
  90. Supertriode with PNP transistors
  91. too much gain
  92. Lloyd's Vintage High Fidelity Audio Devices - both Tube and Solid State
  93. Cheap eBay "zoe_tsan" tube kits - worth anything?
  94. Bell Vintage High Fidelity Audio Devices - both Tube and Solid State
  95. Small Tube Amp with Hum
  96. tube rectifier question
  97. Unison Research S6 schematics
  98. vacuum tube amplifiers should be produced like this?
  99. 6d22s to 6cj3
  100. pot in tube preamp
  101. Mable Audio vs. Suppo audio sound quality
  102. swdfasdfsdf
  103. measuring heater voltage
  104. Need a circuit around these tubes.
  105. Single-Ended 13E1 amplifier
  106. Whats' the max allowable / reasonable ripple in SE amp?
  107. What amp kits are out there?
  108. ECC84/6N14P for audio
  109. PSU ignorant
  110. How to define a quality OT?
  111. Looking for some build advice
  112. ASC oil caps vs M-tube cap for ps
  113. SS CCS and distortion
  114. the valve with no markings
  115. Pentode AB1 design school???
  116. Capability of Sony/Tamradio SE Output Transformers
  117. my CELLINI triode amp
  118. 45-based SET -> Pass Labs F4
  119. Testing Amplifiers - Speaker or dummy load
  120. Quiet amp hums with signal source or input directly tied to star earth??
  121. amp output testing
  122. S5 Amp Comparison?
  123. How to Ground a Preamp PCB Board?
  124. RH807 / 6L6GC g2 issues
  125. 2010: Replacement for Black Gate WKZ 100uF+100uF 500V
  126. sunn solarus guitar amp
  127. Converting Dynaco ST70 Power Transformer for 12.6V
  128. Simple CF with 5687/6900/E182CC
  129. World Audio Design 5881 Schematic needed
  130. PP triode transformer load
  131. 6V6 PP load line
  132. Need help to under stand this 6n3 Kit from ebay
  133. Help:ampeg svt 2 pro 100v>>240v
  134. Blown left channel
  135. Tube preamp build help-heaters
  136. Medium Power SET, EL156 based
  137. Concertina Splitter question - Need help
  138. 6V6 amp - schematic options
  139. Lectron pa50+jh50
  140. 4pr60b valve
  141. Transformer phase splitter
  142. Help! ground hum
  143. Question regarding Leak Stereo 20 and 6SN7 line stage preamp
  144. Recommended upgrades for Yaqin Tube Buffer ?
  145. 6J5 or 6S4 mic amp?
  146. ST-70 build, ideas and advice
  147. Yaqin MC-100B Help Needed!
  148. Preamp Aikido : 6ax5GT,12au7,2c51
  149. Heater of tube
  150. R-Core Winders
  151. 1946 philco amp, tuner, record player
  152. otions for drawing tube schematics on Mac..?
  153. Push/Pull Plate Load Choke - how to figure Inductance?
  154. 6aw8-a tube question
  155. Newbie needs a point in the right direction
  156. Minimalist PL519 OTL?
  157. Telefunken schematics
  158. parallel pp EL84
  159. AD1 Operating Question
  160. 6П3С-Е Russian NOS: Gas Problem
  161. Favourite EL34 circuit
  162. Medium power SET with parallel OP tubes
  163. sds labs into Pas3
  164. Low voltage 6922 preamp...wanting a schematic
  165. Voltage Gain on Long Tailed Drivers
  166. Purpose of 5842 tube?!?
  167. MA XDSE KT88 vs YAQIN MC-100B KT88
  168. JBL Amplifier story
  169. Fender tweed pro-amp clone
  170. Recommended spacing for multiple 5AR4's
  171. Cap choices coupling
  172. Output transformer for PP EL34 source
  173. mini max pre
  174. use 2 ohm speakers
  175. Ask tube rect 5u4c and JJ caps
  176. Adding caps to prevent oscilation in AF 5687
  177. Williamson on EL84. Is it worth doing?
  178. CCS and regulated B+
  179. Garter cross-coupled feedback
  180. soundcard protection Z ???
  181. Using a CCS on SE Output Stage
  182. First amp build... help please!
  183. multiple independent grid biasing from 1 mosfet
  184. Eico HF-81 modification opinion
  185. 4K or 5K Output Transformer
  186. Noisy input on Michaelson & Austin TVA-1
  187. Precision Electronics S-35 help,
  188. Rogers Cadet 3 Problem
  189. Triode Electronics VS Hammond
  190. TRIODE OPERATION USING THE SCREEN GRIDS AS THE CONTROL GRID - this work ?
  191. Start up delay needed???
  192. Connecting a stereo amp as a mono-block
  193. HQ-DHT (All tube DHT amli) 26-45-2A3
  194. 24A tube in triode mode, help !!!
  195. Amperite Ballast
  196. Need super quiet 6.3V filament supply schematic
  197. (Sound Space)Houston 2A3 Power Amplifier
  198. James Burgess 2A3 Monoblocks
  199. Funny tube tale from southamerica
  200. RCA 7189 Black Plates
  201. Preamp nasty noise and hum
  202. EDCOR VS One Electron
  203. Parallel output tubes/valves in push pull. Advantages/disadvantages?
  204. Robinhood output transformers?
  205. looking for help diagnosing volume loss on tube amplified reel to reel player
  206. Question about power consumption Hagerman Cornet Octal
  207. valve rectifier in PSUD
  208. Can you explain what this is ?
  209. volume rise with frequency problem
  210. 1 + 1 = 3 :)
  211. What would the perfect multi-way speaker for a tube amp look like?
  212. GU50 compared with EL84
  213. Counterpoint SA-4 manual and schematics
  214. Ever heard of a Valvo 16ECC ?
  215. the Reversal SRPP
  216. Want to build a C3G linestage
  217. 30A5 tubes
  218. Good speakers to match a K-12
  219. Driving Long Cables, how much current?
  220. twin triode question
  221. Am I going to blow up my 7189s
  222. How is wattage calculated when only using a single section?
  223. Counterpoint SA5 problems and a question.
  224. Headphone Amplifier 6922EH
  225. Fuse Clip for Small Plate Cap Use
  226. Advice sought on medium power triode for tube headphone amplifier
  227. Not the 111M; A Precise 116 Tube Tester
  228. Input stage
  229. Does anyone have any FFT plots from real Class-AB tube amps?
  230. Testing for a Damaged Output Trafo
  231. What has happened to WE Huntsville lately?
  232. Output Transformers Sun HCT 1003 KT
  233. Plexiglass case for small tubes?
  234. 100 Best Sound Tubes
  235. Input tube bias
  236. eschematic amplifier sinle end 12at7 6av6 6bq5
  237. Wiring - Audio Note Transformer Parallel Single-Ended 300B
  238. HV using zener diode
  239. Akai M8 rebuild up and running!
  240. Best current production 2a3
  241. what happens when plugging a stereo source into mono jack on a tube amp?
  242. Transformer coupled Gainclone idea.
  243. Audio Research VT100
  244. output transformer turns per volt
  245. valves and metal cones= bad mating?
  246. Why do you need a grid to ground resistor on a line stage?
  247. Need some help with RIAA Preamp
  248. Swapping transformer cores
  249. got hold of a bunch of tubes...
  250. output transformer secondary configuration

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