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  1. driver stage for ppp 6550's
  2. power supply problem
  3. Positive/Negative Feedback
  4. Unholy Alliance Phono Amp
  5. Shrink a tube amp
  6. lampizator srpp help
  7. the secret of best preamplifier
  8. Any issues with adding a grounded power cord to a Heathkit IT-17 tube tester?
  9. HELP to ID push pull/Single Ende
  10. 12BH7,6414,and 12AT7 to drive EL34 better
  11. Testing Tube Amplifiers
  12. trade off higher HT current for lower filament current ?
  13. Any Russian analog of 12BY7 ?
  14. SV572-10 still being made?
  15. PP Output Transformer Testing Puzzle
  16. baby steps
  17. Partial FB: 2 SE + 1 PI = PP?
  18. G-807=807 SE or PP?
  19. 1Hz oscillation with CCS biased output valves
  20. Ultra-linear 6L6 output stage
  21. Transformer or capacitor coupling?
  22. Victor (JVC) Tube Amp MCM-200
  23. MiniWatt N3 problems, oscillation thumping and RF/motor problems.
  24. A2293 pins connection, help !!!
  25. Start-Up Delay for tube amp !
  26. Getting OPT in Japan?
  27. cathode follower tube buffer using 6n6p
  28. Buzz at output until tubes conduct
  29. I need help for amps.
  30. UL Connection results in higher distortion
  31. Header bypass Cap?
  32. DC heater large cap
  33. How to lower preamp output?
  34. Why use a pre amplifier
  35. DHT-buffered NOS-dac
  36. Microphonics 12AY7 v.s. 12AX7
  37. ECC99/2A3 interstage finished, but have one query
  38. Tube lovers in Germany?
  39. preamplifier
  40. Choosing grid leak resistor value -- partly subjective?
  41. What does the acronym "AMW" stand for?
  42. 6C33C distortion spectrum
  43. 6C33C OTL DC schematic needed
  44. help with identifying the cause of preamp problem
  45. Rosenblit 70w Mac amp
  46. Grounding scheme
  47. CC vs Shunt filament supply?
  48. Need opinions on boxing a dual mono line stage
  49. Lets settle the b+ on cold tubes issue!
  50. New 2A3 SET / Simple, but gentle sounding amplifier
  51. Magnavox Console Amp Chassis
  52. transformer identification
  53. 50Wrms audio amplifier
  54. 12B4 have a good sound ???
  55. almarro OPT question
  56. Best EL84pp kit??
  57. Clarion 6L6G Oscillator Amp.
  58. Did you hear an original tube sound?
  59. Designing an OTL / Circlotron
  60. Cayin A55t or AudioSpace AS-8i Mk.III
  61. filament voltage question
  62. 7236 vs 6AS7 ?
  63. Bias Circuit Calculation
  64. 6V6 Hum Issues
  65. Crossover co-axial
  66. Wurlitzer 6420 to audio amplifiers
  67. Advice on Parafeed Output Transformer
  68. mingda mc34ab mods?
  69. small and cheap OTL schematic needed
  70. ecl82 or ecl86 amplifier decision
  71. Well Here Goes... K16LS in Dynaco Chassis?
  72. Not too often you see one of those
  73. Sweet Peach vs Meng Yue EL84
  74. Attempt at giving back: 6L6GC SE amplifier
  75. Best Complete KT88 Amp Kit under $1K?
  76. Webcor Musicale OT puzzle
  77. Audio Research SP3a
  78. Preamp Conordīs with some malfunctioning
  79. Oscillating PSU above certain voltage
  80. B+ voltage load line question
  81. ming da tube amp smell
  82. Rebuilding my amp, would like some input.
  83. do any of these cv4024s seem genuine to you?
  84. Stupid question: EL34 tubes.
  85. PP with Unbalanced concertina = 2nd H?
  86. harmonic distortion
  87. Enhanced Tube's performance
  88. New GU50 SE: SRRP or Cascode for driver?
  89. Hivac XN11 tubes
  90. Conrad Johnson PV-10a hum. Any advice?
  91. Bob Carver's eye candy on eBay
  92. MFA Lumi started "motor-boating" today
  93. New GM70 tube with problem
  94. Interested in building together a 300B tube amp?
  95. cayin a-55t want to use el34
  96. Mc240
  97. Dht ?
  98. too much output impedance?
  99. College-proofing an ST-70 (aka autobias+ST-70)
  100. reverse polarity of the chinese goods?
  101. 6bg6 and 8k opt power amp project
  102. Need some calculation assist for a psu
  103. Baldwin Transformer Swap
  104. THD, s/n and IM noisy measurements
  105. Little dot 2+, got spark
  106. (INDIA) urgent - high-quality amp builders/techs in Delhi?
  107. What causes saturation in tubes?
  108. Plug and Play Power Supply
  109. GE 5814 and 12AUCIFTE
  110. Amplifier oscillates - advice sought
  111. 50s Amplifier
  112. power supply design question 832A amp
  113. Klimo power supply advice
  114. Earth Not Connected
  115. DC heater supply for phono pre
  116. Audio Note P2SE problem
  117. Aikido Transformers - Good Choice?
  118. Caps before or after MOSFET V-regulator
  119. Which capacitors should I replace?
  120. Testing Amplifiers
  121. Choosing choke valuein pre amp tube
  122. Supertriode with PNP transistors
  123. too much gain
  124. Lloyd's Vintage High Fidelity Audio Devices - both Tube and Solid State
  125. Cheap eBay "zoe_tsan" tube kits - worth anything?
  126. Bell Vintage High Fidelity Audio Devices - both Tube and Solid State
  127. Small Tube Amp with Hum
  128. tube rectifier question
  129. Unison Research S6 schematics
  130. vacuum tube amplifiers should be produced like this?
  131. 6d22s to 6cj3
  132. pot in tube preamp
  133. Mable Audio vs. Suppo audio sound quality
  134. swdfasdfsdf
  135. measuring heater voltage
  136. Need a circuit around these tubes.
  137. Single-Ended 13E1 amplifier
  138. Whats' the max allowable / reasonable ripple in SE amp?
  139. What amp kits are out there?
  140. ECC84/6N14P for audio
  141. PSU ignorant
  142. How to define a quality OT?
  143. Looking for some build advice
  144. ASC oil caps vs M-tube cap for ps
  145. SS CCS and distortion
  146. the valve with no markings
  147. Pentode AB1 design school???
  148. Capability of Sony/Tamradio SE Output Transformers
  149. my CELLINI triode amp
  150. 45-based SET -> Pass Labs F4
  151. Testing Amplifiers - Speaker or dummy load
  152. Quiet amp hums with signal source or input directly tied to star earth??
  153. amp output testing
  154. S5 Amp Comparison?
  155. How to Ground a Preamp PCB Board?
  156. RH807 / 6L6GC g2 issues
  157. 2010: Replacement for Black Gate WKZ 100uF+100uF 500V
  158. sunn solarus guitar amp
  159. Converting Dynaco ST70 Power Transformer for 12.6V
  160. Simple CF with 5687/6900/E182CC
  161. World Audio Design 5881 Schematic needed
  162. PP triode transformer load
  163. 6V6 PP load line
  164. Need help to under stand this 6n3 Kit from ebay
  165. Help:ampeg svt 2 pro 100v>>240v
  166. Blown left channel
  167. Tube preamp build help-heaters
  168. Medium Power SET, EL156 based
  169. Concertina Splitter question - Need help
  170. 6V6 amp - schematic options
  171. Lectron pa50+jh50
  172. 4pr60b valve
  173. Transformer phase splitter
  174. Help! ground hum
  175. Question regarding Leak Stereo 20 and 6SN7 line stage preamp
  176. Recommended upgrades for Yaqin Tube Buffer ?
  177. 6J5 or 6S4 mic amp?
  178. ST-70 build, ideas and advice
  179. Yaqin MC-100B Help Needed!
  180. Preamp Aikido : 6ax5GT,12au7,2c51
  181. Heater of tube
  182. R-Core Winders
  183. 1946 philco amp, tuner, record player
  184. otions for drawing tube schematics on Mac..?
  185. Push/Pull Plate Load Choke - how to figure Inductance?
  186. 6aw8-a tube question
  187. Newbie needs a point in the right direction
  188. Minimalist PL519 OTL?
  189. Telefunken schematics
  190. parallel pp EL84
  191. AD1 Operating Question
  192. 6П3С-Е Russian NOS: Gas Problem
  193. Favourite EL34 circuit
  194. Medium power SET with parallel OP tubes
  195. sds labs into Pas3
  196. Low voltage 6922 preamp...wanting a schematic
  197. Voltage Gain on Long Tailed Drivers
  198. Purpose of 5842 tube?!?
  199. MA XDSE KT88 vs YAQIN MC-100B KT88
  200. JBL Amplifier story
  201. Fender tweed pro-amp clone
  202. Recommended spacing for multiple 5AR4's
  203. Cap choices coupling
  204. Output transformer for PP EL34 source
  205. mini max pre
  206. use 2 ohm speakers
  207. Ask tube rect 5u4c and JJ caps
  208. Adding caps to prevent oscilation in AF 5687
  209. Williamson on EL84. Is it worth doing?
  210. CCS and regulated B+
  211. Garter cross-coupled feedback
  212. soundcard protection Z ???
  213. Using a CCS on SE Output Stage
  214. First amp build... help please!
  215. multiple independent grid biasing from 1 mosfet
  216. Eico HF-81 modification opinion
  217. 4K or 5K Output Transformer
  218. Noisy input on Michaelson & Austin TVA-1
  219. Precision Electronics S-35 help,
  220. Rogers Cadet 3 Problem
  221. Triode Electronics VS Hammond
  222. TRIODE OPERATION USING THE SCREEN GRIDS AS THE CONTROL GRID - this work ?
  223. Start up delay needed???
  224. Connecting a stereo amp as a mono-block
  225. HQ-DHT (All tube DHT amli) 26-45-2A3
  226. 24A tube in triode mode, help !!!
  227. Amperite Ballast
  228. Need super quiet 6.3V filament supply schematic
  229. (Sound Space)Houston 2A3 Power Amplifier
  230. James Burgess 2A3 Monoblocks
  231. Funny tube tale from southamerica
  232. RCA 7189 Black Plates
  233. Preamp nasty noise and hum
  234. EDCOR VS One Electron
  235. Parallel output tubes/valves in push pull. Advantages/disadvantages?
  236. Robinhood output transformers?
  237. looking for help diagnosing volume loss on tube amplified reel to reel player
  238. Question about power consumption Hagerman Cornet Octal
  239. valve rectifier in PSUD
  240. Can you explain what this is ?
  241. volume rise with frequency problem
  242. 1 + 1 = 3 :)
  243. What would the perfect multi-way speaker for a tube amp look like?
  244. GU50 compared with EL84
  245. Counterpoint SA-4 manual and schematics
  246. Ever heard of a Valvo 16ECC ?
  247. the Reversal SRPP
  248. Want to build a C3G linestage
  249. 30A5 tubes
  250. Good speakers to match a K-12

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