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  1. Need help troubleshooting Yamamoto A08S Kit build :-(
  2. Curcio Audio status
  3. Thorens AZ-25 restoration
  4. Question about slew rate of CCS for cathode bias
  5. ASUSA K2003
  6. Good Gravy, This Thing Is HUGE!
  7. Those Pesky triodes
  8. 310A tubes.. Country of origin
  9. Speaker for EL34 SE amp
  10. Advice on power umbilical connectors
  11. Matching valves
  12. output transformer new vs vintage iron
  13. Looking for Dynaco ST-70 Power Supply Info/Specs
  14. Parallel GM70 Amp
  15. Bad repair jobs
  16. 8mV of noise causing havoc in valve pre amp.
  17. Simple 12AX7 gain stage loss of HF - impedance?
  18. 6N7/6CB5A Amplifier - Part 1?
  19. 12AU7 Valve output impedance.
  20. modifying Musical Paradise 300b amp
  21. WE417 replaces 12AX7/12AU7?
  22. Making tubes last longer by lowering Voltage?
  23. Stereo Tube Amp Under 10 Watts Inquiry
  24. World Audio Design KECL82 Schematic
  25. DIY tube preamp with active crossover
  26. Questions re restoring old amp
  27. M2057's, has anyone experimented with these yet????
  28. Question about building amp from AA100 parts
  29. What is a R4A3 type valve?
  30. Seeking a peer review for my preamp design
  31. List of commercial all tube phono preamplifiers
  32. Schaded SE Pentode drive Pentode amp
  33. GM70 IT PP
  34. tube preamp oscillation
  35. What determines the bass response in a Magnavox 93 series amp?
  36. Preamp/Phono Stage Transformer
  37. Yaqin MC10
  38. the small SE UL ECL 805 / EY 82 !!!
  39. Is this ERNIE?
  40. Offering from China
  41. Name that tube manufacturer
  42. Does sunlight affect valve characteristics?
  43. Can we talk about series/pass regulators?
  44. How electrically fragile /robust are valves?
  45. Altec Lansing 345a variant/homebrew
  46. Another newb with a plan-to-build saying hello
  47. What is the closed alternative to CV4002?
  48. A safe Dc coupled amp
  49. 6550b amplifier schematic
  50. Chokes on the old days VS. flter caps
  51. Old tube amp used outside.
  52. Has anyone tried Metglass C-Cores in Audio Transformers ?
  53. Dynaco ST-70 rebuild makes hum when plugged to input, not with shorting plug
  54. 12ax7/5751 - using the full tube or half in gain stage
  55. When is too strong a tube still good ??
  56. Would you say this is good or bad blue glow?
  57. 211 vacuum tube rolling for Air Tight 211
  58. Is it ok to put a valve inside a vented enclosure ?
  59. What phase splitter is this?
  60. 6GK5 as input tube for phono preamp?
  61. Tube bias problems
  62. K12 change transformer
  63. Me and my soon to be amplifier
  64. Pioneer ER-420 tuner dial issue.
  65. Akai M8 Amplifier Mods
  66. The 'every tube' amplifier
  67. EL84 power supply
  68. resistor in HT supply
  69. 5824 (25B6G) output tube
  70. relative impedance of balance pot to volume pot
  71. Glassware Opinions
  72. Tip for searching for schematics
  73. Why is a (power) triode so expensive?
  74. Advise on output transformer vs PP tubes
  75. newbie heater filament issues
  76. Grid-cathode voltage and grid current in 12AX7?
  77. Lafayette LA-240. Schematic please.
  78. A little advice ? Please
  79. CF output stage - float heater or tie to cathode?
  80. Help redesigning schematic from GZ34 to EY200A rectifiers
  81. 12 VAC Aikido, need part numbers
  82. Dynavox VR70
  83. 12BZ7
  84. Troubleshooting 6GU7/KT88 Williamson Amplifier
  85. 12AX7 stand alone preamp output load
  86. Super Triode Connected (STC) chip amp
  87. WE 350B and tube tester
  88. Lundahl LL9202 secondary inductance help
  89. Low noise compromise
  90. RH 6550 SE amplifier
  91. Help substituting power transformer.
  92. acuhorn clone
  93. Low Voltage Tube Head Amp.
  94. Balanced Tube Headphone Amplifier?
  95. Williamson amplifier re-build
  96. Out of the Box: Part 6, a 25W PP UL 6L6GC Monoblock
  97. Grundig External Speaker amplifier IV
  98. Parts for 8audio EL34 Jadis JA30 build
  99. Question about output transformer
  100. Current Shunt
  101. Parafeed L & C calculations wrt Z?
  102. Cathode Bias Resistor and Capacitor Values
  103. Pentone preamp to get some saturation for SS amp
  104. Out of the Box Part 5: SE 6AQ5 Completley Integrated Amp
  105. Forgive Me DIY Audio, For I Have Sinned 10LY8
  106. PSUD II question
  107. Purist Wet Dreams Customized Review
  108. Triodes and feedback theory
  109. Transformer taps
  110. my new philips stereo system!
  111. Phono preamp with modern pentode as first stage
  112. Adding headphone output to Aikido LV
  113. QEE3041 output trafo on tube amps?
  114. 6A3 Cool Amp
  115. Magnavox 175 - different feedback in each channel
  116. Outside the Box, Part 4, a Class AB2 PP 6V6 Amp
  117. 6GF7 and 300B amp
  118. AC filament and ground
  119. Dummy load for tube amp
  120. have i just blown my valve amp?
  121. Sub miniature pentodes - what shall I do with them?
  122. DRD calculator
  123. OTs in parrallel without one tube
  124. Cathodyne investigation - stop the presses!
  125. Special offer for skilled tube fanatics
  126. Heathkit w7-M Power Supply Sidebands
  127. Morrison 300B SET - where to connect current meters?
  128. Could someone look over my schema?
  129. question on 101D tube
  130. Outside the Box- Part lll, Twin Coupled Amp
  131. Thoriated Tungsten Filament 2A3?
  132. Screen resistor sag limiting zener.
  133. Baffling Hum Issue
  134. Can I replace 6H9C (6SL7) with 6SN7?
  135. How Good Is This Amp(Sound Luster)
  136. 6V6 grid-to-ground resistor tone shaping?
  137. Pioneer SX-34B
  138. Outside the Box - Part ll All Triode UL PP Amplifier
  139. How to add Global NFB to a circuit with LED bias and cathode follower?
  140. Heathkit EA-2 customization
  141. cathode feedback transformer and damping factor
  142. Is my 274b/n defective
  143. Need to find 300B tube amp use 6SN7 5U4G >25w/ch
  144. Two SE OPT -> one PP OPT?
  145. Thinking Outside the Box - A Different Kind of Triode Audio Amplifier
  146. Amp Circuits Tutorial
  147. Push pull ecl86 stereo amp
  148. Using a CCS for bias.
  149. Using Telefunken EL-156 in Dynaco Mark III amp
  150. preamplifier with POSITIVE bootstrap feedback
  151. Low Voltage Aikido questions
  152. I had an idea for a SE UL amp with local feedback output stage
  153. Woolgathering
  154. all dht system?
  155. Question - Labeling Tested Tubes
  156. Tube amp inactivity auto-off
  157. High gm version of 12AU7
  158. Need help on B+ output
  159. Tube substitute
  160. DIY SRPP ecc82
  161. Schematic needed for circa 1985 tube preamp kit
  162. Ultra-Linear Midget Amp ?
  163. 12AX7 + 12AU7 preamp with feedback?
  164. Counterpoint SA 3000 Transformer
  165. EL 84 in triode
  166. Pictures of your socket dampers (shock mounts) installed!
  167. Amperex bugle boy help
  168. Can I use a PP interstage for SE?
  169. Classic 4 valve PPP circuits
  170. Ultra linear OT PP 30W/25W for SE amp of low power? Safe?
  171. 12v/24v RIAA MM preamp
  172. Schiit LISST SS tubes?
  173. Feline Futterman OTL Amp
  174. CatSkin Class A2 SET with Secondary Flux Cancellation
  175. How to wire a 4pin base to 5 pin top tube socket adapter
  176. Coupling cap spec
  177. Bought 6AS5, got 6AS6 instead. Any audio use?
  178. Help verifying EF86
  179. Quad II power transformer
  180. KT88 Mutual Conductance Test
  181. Help Identifying A Valve Amplifier
  182. Sonic Frontiers Power 3 Help Needed
  183. Re-build of my first OTL from 2000
  184. Help with choosing substitute output transformer??
  185. Last stop before the end of the road !
  186. Output Transformer insertion/power losses
  187. OTL, not OTL, & Matching VS Loading transformers
  188. Out with the MJ in with the Aikido
  189. What can I use parts for?
  190. Can someone help me understand this topology?
  191. Looking for PP design when I already have the OPTs
  192. New project, Damn Good 300B amp.
  193. medium power (~20W) amplifier and power supply requirements
  194. ID this Dynaco ST-70 board
  195. SRPP with different brand of tubes ?
  196. Best tube amp clone for stereo music
  197. RCA receivers / amps
  198. Triode PP design questions - where to add gain?
  199. Push Pull Tube Amplifier with CCS
  200. McIntosh MC275 problem.
  201. converting pentode data to triode-strapped? The 1609 pentode?
  202. Moscode 300 Manual/schematic
  203. Need help with new amp design
  204. 4699 SEP (unusual cathode feedback?)
  205. DH filament side matters?
  206. FU50 + 6N8P + 5Z3P Amplifier
  207. Collet wire connector for 300B socket?
  208. KT-88, KT-77, Russian 6SN7 makes "pops". Should I touch their pin with an iron?
  209. Tube Power Supply Question
  210. Would there be any harm using 10K OPT for 45 tubes?
  211. Restoring the first Pye HF25
  212. Jolida FX10 mods
  213. Help needed - DIY amp not working; first time powering up
  214. EL86: push-pull for home
  215. Input transformer question? Help identifying
  216. Anyone ever tried building the Feral Eye 2A3 PP?
  217. Schade Feedback In A Push Pull Differential Amplifier?
  218. PSA: new diy tubes sub on Reddit
  219. Hum/Buzz in a tube PP amp
  220. 300B+6GL7 SE stereo integrated amplifier
  221. Bias tap on b+ or separate winding?
  222. Arcturus No. 12 tube
  223. SainSmart 6N3 pre for Pass ACA
  224. Single ended MM tube phono amp
  225. 5U4G schematic for 4x6SN7 Stereo Octal Akido Preamp.
  226. ECL82 amp from old magnetophones
  227. Bogen MO100A with KT120 ??
  228. Someone sales out trafos Jensen transformers in europe?
  229. Book recommendation?
  230. Sanity check? HV supply for 125wpc sweep tube amp
  231. 6922 Technical info (help)
  232. How about this phono idea
  233. Scottkit trouble
  234. How to remove tube metalization
  235. Old Dynatron Information
  236. good driver tube with 150mA heater?
  237. Tell me what this is
  238. Switch between tubes with relay
  239. Need some help with my Palmer Eins
  240. A rare tube in my hands. Info please.
  241. Dealing with Heater Elevation/Ground Reference for aux circuit
  242. 6GK5 OR 6AH5 for phono head amp
  243. Parallel triodes: best connection?
  244. Which resistors to replace burned ones in Dared DV-300b monoblocks
  245. Unusual tube preamp, will it work?
  246. Eico HF-81 with Pre Out?
  247. volume control by pass power tube
  248. Single End Transfomers, The hysteresis loop and maximum current
  249. DC at output on startup
  250. Yet another ECC82/12AU7 Line Preamp

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