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  1. Making a console stereo to a speaker amp?
  2. Strange valve pre amp on ebay.
  3. 833A "budget" design
  4. FU50 tube amp mods and schematic
  5. Tube type W1039 (subs NR27/A or CV1161) - Needs Datasheet, curves and/or info (any)
  6. Audio Research SP6B
  7. VTA PH16 Build
  8. What tubes to use with this Interstage Transformers?
  9. Questions and Problems with Mullard 5-10 clone
  10. semi scratch build; pas 3 board and pwr supply
  11. SHIII project, Dual-SE
  12. Battery bias and negative feedback
  13. schematic/kit recommendation for low gain output stage
  14. Help identifying OPT
  15. Getting Started On RCA Console I picked up
  16. Er, what's plate voltage?
  17. 6SN7 DIY preamp suggestions
  18. Hybrid 5.1 SURROUND Tube preamp/Mosfet Amp
  19. Where is the problem in 211 tube power amp.
  20. An Unusual SE Bench Amp
  21. HK A500 restoration log
  22. How many grid stoppers do I need ?
  23. Bogen Console Revamp
  24. Anyone guy with experience in turret cascode TV tuners
  25. Phono stage with remote transformer?
  26. Need help troubleshooting Yamamoto A08S Kit build :-(
  27. Curcio Audio status
  28. Thorens AZ-25 restoration
  29. Question about slew rate of CCS for cathode bias
  30. ASUSA K2003
  31. Good Gravy, This Thing Is HUGE!
  32. Those Pesky triodes
  33. 310A tubes.. Country of origin
  34. Speaker for EL34 SE amp
  35. Advice on power umbilical connectors
  36. Matching valves
  37. output transformer new vs vintage iron
  38. Looking for Dynaco ST-70 Power Supply Info/Specs
  39. Parallel GM70 Amp
  40. Bad repair jobs
  41. 8mV of noise causing havoc in valve pre amp.
  42. Simple 12AX7 gain stage loss of HF - impedance?
  43. 6N7/6CB5A Amplifier - Part 1?
  44. 12AU7 Valve output impedance.
  45. modifying Musical Paradise 300b amp
  46. WE417 replaces 12AX7/12AU7?
  47. Making tubes last longer by lowering Voltage?
  48. Stereo Tube Amp Under 10 Watts Inquiry
  49. World Audio Design KECL82 Schematic
  50. DIY tube preamp with active crossover
  51. Questions re restoring old amp
  52. M2057's, has anyone experimented with these yet????
  53. Question about building amp from AA100 parts
  54. What is a R4A3 type valve?
  55. Seeking a peer review for my preamp design
  56. List of commercial all tube phono preamplifiers
  57. Schaded SE Pentode drive Pentode amp
  58. GM70 IT PP
  59. tube preamp oscillation
  60. What determines the bass response in a Magnavox 93 series amp?
  61. Preamp/Phono Stage Transformer
  62. Yaqin MC10
  63. the small SE UL ECL 805 / EY 82 !!!
  64. Is this ERNIE?
  65. Offering from China
  66. Name that tube manufacturer
  67. Does sunlight affect valve characteristics?
  68. Can we talk about series/pass regulators?
  69. How electrically fragile /robust are valves?
  70. Altec Lansing 345a variant/homebrew
  71. Another newb with a plan-to-build saying hello
  72. What is the closed alternative to CV4002?
  73. A safe Dc coupled amp
  74. 6550b amplifier schematic
  75. Chokes on the old days VS. flter caps
  76. Old tube amp used outside.
  77. Has anyone tried Metglass C-Cores in Audio Transformers ?
  78. Dynaco ST-70 rebuild makes hum when plugged to input, not with shorting plug
  79. 12ax7/5751 - using the full tube or half in gain stage
  80. When is too strong a tube still good ??
  81. Would you say this is good or bad blue glow?
  82. 211 vacuum tube rolling for Air Tight 211
  83. Is it ok to put a valve inside a vented enclosure ?
  84. What phase splitter is this?
  85. 6GK5 as input tube for phono preamp?
  86. Tube bias problems
  87. K12 change transformer
  88. Me and my soon to be amplifier
  89. Pioneer ER-420 tuner dial issue.
  90. Akai M8 Amplifier Mods
  91. The 'every tube' amplifier
  92. EL84 power supply
  93. resistor in HT supply
  94. Any Chinese amp that can be a good platform to mod into high end quality?
  95. 5824 (25B6G) output tube
  96. relative impedance of balance pot to volume pot
  97. Glassware Opinions
  98. Tip for searching for schematics
  99. Why is a (power) triode so expensive?
  100. Advise on output transformer vs PP tubes
  101. newbie heater filament issues
  102. Grid-cathode voltage and grid current in 12AX7?
  103. Lafayette LA-240. Schematic please.
  104. A little advice ? Please
  105. CF output stage - float heater or tie to cathode?
  106. Help redesigning schematic from GZ34 to EY200A rectifiers
  107. 12 VAC Aikido, need part numbers
  108. 12BZ7
  109. Troubleshooting 6GU7/KT88 Williamson Amplifier
  110. 12AX7 stand alone preamp output load
  111. Super Triode Connected (STC) chip amp
  112. WE 350B and tube tester
  113. Lundahl LL9202 secondary inductance help
  114. Low noise compromise
  115. RH 6550 SE amplifier
  116. Help substituting power transformer.
  117. acuhorn clone
  118. Low Voltage Tube Head Amp.
  119. Balanced Tube Headphone Amplifier?
  120. Williamson amplifier re-build
  121. Out of the Box: Part 6, a 25W PP UL 6L6GC Monoblock
  122. Grundig External Speaker amplifier IV
  123. Parts for 8audio EL34 Jadis JA30 build
  124. Question about output transformer
  125. Current Shunt
  126. Parafeed L & C calculations wrt Z?
  127. Cathode Bias Resistor and Capacitor Values
  128. Pentone preamp to get some saturation for SS amp
  129. Out of the Box Part 5: SE 6AQ5 Completley Integrated Amp
  130. Forgive Me DIY Audio, For I Have Sinned 10LY8
  131. Amazon resistor "selections"
  132. PSUD II question
  133. Suggestion of schematic for a high quality preamp
  134. Purist Wet Dreams Customized Review
  135. Triodes and feedback theory
  136. Transformer taps
  137. my new philips stereo system!
  138. Phono preamp with modern pentode as first stage
  139. Adding headphone output to Aikido LV
  140. QEE3041 output trafo on tube amps?
  141. 6A3 Cool Amp
  142. Magnavox 175 - different feedback in each channel
  143. Outside the Box, Part 4, a Class AB2 PP 6V6 Amp
  144. 6GF7 and 300B amp
  145. AC filament and ground
  146. Dummy load for tube amp
  147. have i just blown my valve amp?
  148. Sub miniature pentodes - what shall I do with them?
  149. DRD calcurator
  150. OTs in parrallel without one tube
  151. Cathodyne investigation - stop the presses!
  152. Special offer for skilled tube fanatics
  153. Heathkit w7-M Power Supply Sidebands
  154. Morrison 300B SET - where to connect current meters?
  155. Could someone look over my schema?
  156. question on 101D tube
  157. Outside the Box- Part lll, Twin Coupled Amp
  158. Thoriated Tungsten Filament 2A3?
  159. Screen resistor sag limiting zener.
  160. Baffling Hum Issue
  161. Can I replace 6H9C (6SL7) with 6SN7?
  162. How Good Is This Amp(Sound Luster)
  163. 6V6 grid-to-ground resistor tone shaping?
  164. Pioneer SX-34B
  165. Outside the Box - Part ll All Triode UL PP Amplifier
  166. How to add Global NFB to a circuit with LED bias and cathode follower?
  167. Heathkit EA-2 customization
  168. cathode feedback transformer and damping factor
  169. Is my 274b/n defective
  170. Need to find 300B tube amp use 6SN7 5U4G >25w/ch
  171. Two SE OPT -> one PP OPT?
  172. Thinking Outside the Box - A Different Kind of Triode Audio Amplifier
  173. Amp Circuits Tutorial
  174. Push pull ecl86 stereo amp
  175. Using a CCS for bias.
  176. Using Telefunken EL-156 in Dynaco Mark III amp
  177. preamplifier with POSITIVE bootstrap feedback
  178. Low Voltage Aikido questions
  179. I had an idea for a SE UL amp with local feedback output stage
  180. Woolgathering
  181. all dht system?
  182. Question - Labeling Tested Tubes
  183. Filament bias impedance.
  184. Tube amp inactivity auto-off
  185. High gm version of 12AU7
  186. Need help on B+ output
  187. Tube substitute
  188. DIY SRPP ecc82
  189. Schematic needed for circa 1985 tube preamp kit
  190. Ultra-Linear Midget Amp ?
  191. Why do cathode followers have 100% feedback?
  192. 12AX7 + 12AU7 preamp with feedback?
  193. Counterpoint SA 3000 Transformer
  194. EL 84 in triode
  195. Pictures of your socket dampers (shock mounts) installed!
  196. Amperex bugle boy help
  197. Old tube Tek sig generator - what's good in there?
  198. Can I use a PP interstage for SE?
  199. Classic 4 valve PPP circuits
  200. Ultra linear OT PP 30W/25W for SE amp of low power? Safe?
  201. 12v/24v RIAA MM preamp
  202. Schiit LISST SS tubes?
  203. Feline Futterman OTL Amp
  204. CatSkin Class A2 SET with Secondary Flux Cancellation
  205. How to wire a 4pin base to 5 pin top tube socket adapter
  206. Coupling cap spec
  207. Bought 6AS5, got 6AS6 instead. Any audio use?
  208. Help verifying EF86
  209. Quad II power transformer
  210. KT88 Mutual Conductance Test
  211. 4P1L worth stocking up?
  212. Help Identifying A Valve Amplifier
  213. Sonic Frontiers Power 3 Help Needed
  214. Re-build of my first OTL from 2000
  215. Help with choosing substitute output transformer??
  216. Last stop before the end of the road !
  217. Output Transformer insertion/power losses
  218. OTL, not OTL, & Matching VS Loading transformers
  219. Out with the MJ in with the Aikido
  220. What can I use parts for?
  221. Can someone help me understand this topology?
  222. Looking for PP design when I already have the OPTs
  223. New project, Damn Good 300B amp.
  224. medium power (~20W) amplifier and power supply requirements
  225. ID this Dynaco ST-70 board
  226. SRPP with different brand of tubes ?
  227. Best tube amp clone for stereo music
  228. RCA receivers / amps
  229. Triode PP design questions - where to add gain?
  230. Push Pull Tube Amplifier with CCS
  231. McIntosh MC275 problem.
  232. converting pentode data to triode-strapped? The 1609 pentode?
  233. Moscode 300 Manual/schematic
  234. Need help with new amp design
  235. 4699 SEP (unusual cathode feedback?)
  236. DH filament side matters?
  237. FU50 + 6N8P + 5Z3P Amplifier
  238. Collet wire connector for 300B socket?
  239. KT-88, KT-77, Russian 6SN7 makes "pops". Should I touch their pin with an iron?
  240. Low voltage Tubelab sse
  241. Tube Power Supply Question
  242. Would there be any harm using 10K OPT for 45 tubes?
  243. Restoring the first Pye HF25
  244. Jolida FX10 mods
  245. Help needed - DIY amp not working; first time powering up
  246. EL86: push-pull for home
  247. Input transformer question? Help identifying
  248. Anyone ever tried building the Feral Eye 2A3 PP?
  249. Schade Feedback In A Push Pull Differential Amplifier?
  250. PSA: new diy tubes sub on Reddit

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