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  1. K-12G Tube amp Hum at low volume
  2. SE 6c33 Amplifier OPT overshoot/ringing oscillations
  3. Dynaco MKIII issue
  4. SRPP 300B Headphone Amplifier
  5. LDR's in the Marantz 10b
  6. Shuguang Treasure CV181-Z Lifespan in hours?
  7. Need to help to understand using 6x5 as half wave rect
  8. 300B plate voltages
  9. Mullard 3-3 power supply
  10. Best path into diy hifi tube audio
  11. 801A PP or 2a3 PP
  12. Shuguang Treasure tube genuine source?
  13. Passive RIAA with 6F12P and 6N5P
  14. ANDREA a Democratic hybrid amp for luxury sound
  15. Quad II classic output transformer
  16. overheating 10w resistor in power supply
  17. Strange EL34BW
  18. Scott LC21 tube hums when hand is near
  19. Request for help with Wavebourn's SVCS
  20. Lundahl LL1682PP suitable for 300B PP amp?
  21. Modding input of EAR859 to feed output for Bi-Amp?
  22. Voltage gain triode
  23. Excellent midbass performance
  24. 6SN7 Mu Follower problem in distortion
  25. 6N7's in phase inverter service
  26. Going to Amberg Germany and Graz Austria, Any DIY-ers in the area have time to meet?
  27. Mullard 3-3, wrong power transformer
  28. Tube hybrid vfet
  29. 12ax7 + 12au7 strange behavior
  30. Hybrid amplifier with 6SN7 or 6SL7 tube
  31. Dynaco ST70 midrange glare
  32. Request review of my schematic
  33. 12AX7/12AU7 Williamson-style front end
  34. No-Vacuum Diamond Triode Device
  35. 6CB6 pentodes and 12AU7 twin triode to replace 7199 in major SCA35 rebuild
  36. miniwatt as headphone amp, impedance Q
  37. Fluorescing GU 29 tubes - whats wrong?
  38. SE 6CA7 Stereo Tube Amplifier Pot Hum
  39. Paragon 12A
  40. Need Help with PSU for KT120 / KT150 SE
  41. SE valve tube output transformer clarification.
  42. Poor valves or expecting too much ?
  43. ST-70 vs. Mark IV heater connections
  44. 6H8C Glass Moves
  45. Audio Research LS2BMkII parts identification
  46. Newbie Recapping, Help identifying caps
  47. Suppressor Grid tied to plate and not ground
  48. Picked up a heathkit aa - 32. ....now what.
  49. EL34 Internal shorts
  50. Questions about this EL34 amp design
  51. Troubleshooting 6550 Jadis Clone
  52. Help the newb: cathode to heater shortage
  53. Diy tube amp recommandation
  54. Bogen Presto Challenger AC220 Stereo Amplifier
  55. How to parafeed 811a from this schematic
  56. Help me to understand a simple bias question...
  57. Poinz Musical Machine - which class is it?
  58. A question on tube rolling
  59. Small tube stash - whats useful?
  60. Parallel triodes, single output question
  61. EL84 red plating
  62. ECC83 self-bias test circuit, weird mesurements
  63. AIKIDO
  64. vintage electronics kit
  65. Revox 40 tube amp 4 x ecl86
  66. DIY Preamp Issues
  67. 6n16b operating point
  68. Pete Millett's MAGIC BOX (6BN6 tube)
  69. Need confirmation if my schematic is good at all. It uses 50L6 as a stereo hi fi amp
  70. Chinese 6SN7 300B SE Amp - need help to tweak
  71. Kondo KSL-M77 heater regulator?
  72. Quad II issues
  73. THD measurements keithley 2015 integrated anp
  74. SRPP #56>D3A>EL 156 SE Build.
  75. webcore schematics???
  76. Purpose of LC Circuit going to Output Transformer?
  77. 12ax7+12au7 for DAC i/v
  78. Eico 666 settings for 5670
  79. transconductance conversion
  80. What is the pressure inside a mercury rectifier?
  81. Strange distortion value?
  82. Glass Ware and Pass
  83. Is over or undervolting bad for amps?
  84. Mod an EICO ST-70 or HF-20 into FISHER KX-200?
  85. Paralleled 12AX7's for phono stage
  86. Drive
  87. Telefunken Princess II 5486MX transformer question
  88. DAC in the Amp?
  89. Tube data for the 9AM10
  90. 5687 headphone amp
  91. Marantz Model 9 Prototype.
  92. Motorboating Tubes
  93. Mc Farlow f1mk2
  94. Global Matching of Great Tube WE300B, WE417A...etc
  95. What to do with unused half of triode ?
  96. Dynaco Mk III output transformers
  97. Gu-15
  98. Making a console stereo to a speaker amp?
  99. Strange valve pre amp on ebay.
  100. 833A "budget" design
  101. FU50 tube amp mods and schematic
  102. Tube type W1039 (subs NR27/A or CV1161) - Needs Datasheet, curves and/or info (any)
  103. Audio Research SP6B
  104. VTA PH16 Build
  105. What tubes to use with this Interstage Transformers?
  106. Questions and Problems with Mullard 5-10 clone
  107. semi scratch build; pas 3 board and pwr supply
  108. SHIII project, Dual-SE
  109. Battery bias and negative feedback
  110. schematic/kit recommendation for low gain output stage
  111. Help identifying OPT
  112. Getting Started On RCA Console I picked up
  113. Er, what's plate voltage?
  114. 6SN7 DIY preamp suggestions
  115. Hybrid 5.1 SURROUND Tube preamp/Mosfet Amp
  116. Where is the problem in 211 tube power amp.
  117. An Unusual SE Bench Amp
  118. HK A500 restoration log
  119. How many grid stoppers do I need ?
  120. Bogen Console Revamp
  121. Anyone guy with experience in turret cascode TV tuners
  122. Phono stage with remote transformer?
  123. Need help troubleshooting Yamamoto A08S Kit build :-(
  124. Curcio Audio status
  125. Thorens AZ-25 restoration
  126. Question about slew rate of CCS for cathode bias
  127. ASUSA K2003
  128. Good Gravy, This Thing Is HUGE!
  129. Those Pesky triodes
  130. 310A tubes.. Country of origin
  131. Speaker for EL34 SE amp
  132. Advice on power umbilical connectors
  133. Matching valves
  134. output transformer new vs vintage iron
  135. Looking for Dynaco ST-70 Power Supply Info/Specs
  136. Parallel GM70 Amp
  137. Bad repair jobs
  138. 8mV of noise causing havoc in valve pre amp.
  139. Simple 12AX7 gain stage loss of HF - impedance?
  140. 6N7/6CB5A Amplifier - Part 1?
  141. 12AU7 Valve output impedance.
  142. modifying Musical Paradise 300b amp
  143. WE417 replaces 12AX7/12AU7?
  144. Making tubes last longer by lowering Voltage?
  145. Stereo Tube Amp Under 10 Watts Inquiry
  146. World Audio Design KECL82 Schematic
  147. DIY tube preamp with active crossover
  148. Questions re restoring old amp
  149. M2057's, has anyone experimented with these yet????
  150. Question about building amp from AA100 parts
  151. What is a R4A3 type valve?
  152. Seeking a peer review for my preamp design
  153. List of commercial all tube phono preamplifiers
  154. Schaded SE Pentode drive Pentode amp
  155. GM70 IT PP
  156. tube preamp oscillation
  157. What determines the bass response in a Magnavox 93 series amp?
  158. Preamp/Phono Stage Transformer
  159. Yaqin MC10
  160. the small SE UL ECL 805 / EY 82 !!!
  161. Is this ERNIE?
  162. Offering from China
  163. Name that tube manufacturer
  164. Does sunlight affect valve characteristics?
  165. Can we talk about series/pass regulators?
  166. How electrically fragile /robust are valves?
  167. Altec Lansing 345a variant/homebrew
  168. Another newb with a plan-to-build saying hello
  169. What is the closed alternative to CV4002?
  170. A safe Dc coupled amp
  171. 6550b amplifier schematic
  172. Chokes on the old days VS. flter caps
  173. Old tube amp used outside.
  174. Has anyone tried Metglass C-Cores in Audio Transformers ?
  175. Dynaco ST-70 rebuild makes hum when plugged to input, not with shorting plug
  176. 12ax7/5751 - using the full tube or half in gain stage
  177. When is too strong a tube still good ??
  178. Would you say this is good or bad blue glow?
  179. 211 vacuum tube rolling for Air Tight 211
  180. Is it ok to put a valve inside a vented enclosure ?
  181. What phase splitter is this?
  182. 6GK5 as input tube for phono preamp?
  183. Tube bias problems
  184. K12 change transformer
  185. Me and my soon to be amplifier
  186. Pioneer ER-420 tuner dial issue.
  187. Akai M8 Amplifier Mods
  188. The 'every tube' amplifier
  189. EL84 power supply
  190. resistor in HT supply
  191. Any Chinese amp that can be a good platform to mod into high end quality?
  192. 5824 (25B6G) output tube
  193. relative impedance of balance pot to volume pot
  194. Glassware Opinions
  195. Tip for searching for schematics
  196. Why is a (power) triode so expensive?
  197. Advise on output transformer vs PP tubes
  198. newbie heater filament issues
  199. Grid-cathode voltage and grid current in 12AX7?
  200. Lafayette LA-240. Schematic please.
  201. A little advice ? Please
  202. CF output stage - float heater or tie to cathode?
  203. Help redesigning schematic from GZ34 to EY200A rectifiers
  204. 12 VAC Aikido, need part numbers
  205. 12BZ7
  206. Troubleshooting 6GU7/KT88 Williamson Amplifier
  207. 12AX7 stand alone preamp output load
  208. Super Triode Connected (STC) chip amp
  209. WE 350B and tube tester
  210. Lundahl LL9202 secondary inductance help
  211. Low noise compromise
  212. RH 6550 SE amplifier
  213. Help substituting power transformer.
  214. acuhorn clone
  215. Low Voltage Tube Head Amp.
  216. Balanced Tube Headphone Amplifier?
  217. Williamson amplifier re-build
  218. Out of the Box: Part 6, a 25W PP UL 6L6GC Monoblock
  219. Grundig External Speaker amplifier IV
  220. Parts for 8audio EL34 Jadis JA30 build
  221. Question about output transformer
  222. Current Shunt
  223. Parafeed L & C calculations wrt Z?
  224. Cathode Bias Resistor and Capacitor Values
  225. Pentone preamp to get some saturation for SS amp
  226. Out of the Box Part 5: SE 6AQ5 Completley Integrated Amp
  227. Forgive Me DIY Audio, For I Have Sinned 10LY8
  228. PSUD II question
  229. Suggestion of schematic for a high quality preamp
  230. Purist Wet Dreams Customized Review
  231. Triodes and feedback theory
  232. Transformer taps
  233. my new philips stereo system!
  234. Phono preamp with modern pentode as first stage
  235. Adding headphone output to Aikido LV
  236. QEE3041 output trafo on tube amps?
  237. 6A3 Cool Amp
  238. Magnavox 175 - different feedback in each channel
  239. Outside the Box, Part 4, a Class AB2 PP 6V6 Amp
  240. 6GF7 and 300B amp
  241. AC filament and ground
  242. Dummy load for tube amp
  243. have i just blown my valve amp?
  244. Sub miniature pentodes - what shall I do with them?
  245. DRD calcurator
  246. OTs in parrallel without one tube
  247. Cathodyne investigation - stop the presses!
  248. Special offer for skilled tube fanatics
  249. Heathkit w7-M Power Supply Sidebands
  250. Morrison 300B SET - where to connect current meters?

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