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  1. Hybrid amplifier with 6SN7 or 6SL7 tube
  2. Dynaco ST70 midrange glare
  3. Request review of my schematic
  4. 12AX7/12AU7 Williamson-style front end
  5. No-Vacuum Diamond Triode Device
  6. 6CB6 pentodes and 12AU7 twin triode to replace 7199 in major SCA35 rebuild
  7. miniwatt as headphone amp, impedance Q
  8. Fluorescing GU 29 tubes - whats wrong?
  9. SE 6CA7 Stereo Tube Amplifier Pot Hum
  10. Paragon 12A
  11. Need Help with PSU for KT120 / KT150 SE
  12. SE valve tube output transformer clarification.
  13. Poor valves or expecting too much ?
  14. ST-70 vs. Mark IV heater connections
  15. 6H8C Glass Moves
  16. Audio Research LS2BMkII parts identification
  17. Newbie Recapping, Help identifying caps
  18. Suppressor Grid tied to plate and not ground
  19. Picked up a heathkit aa - 32. ....now what.
  20. EL34 Internal shorts
  21. Questions about this EL34 amp design
  22. Troubleshooting 6550 Jadis Clone
  23. Help the newb: cathode to heater shortage
  24. Diy tube amp recommandation
  25. Bogen Presto Challenger AC220 Stereo Amplifier
  26. How to parafeed 811a from this schematic
  27. Help me to understand a simple bias question...
  28. Poinz Musical Machine - which class is it?
  29. A question on tube rolling
  30. Small tube stash - whats useful?
  31. Parallel triodes, single output question
  32. EL84 red plating
  33. ECC83 self-bias test circuit, weird mesurements
  34. AIKIDO
  35. vintage electronics kit
  36. Revox 40 tube amp 4 x ecl86
  37. DIY Preamp Issues
  38. 6n16b operating point
  39. Pete Millett's MAGIC BOX (6BN6 tube)
  40. Need confirmation if my schematic is good at all. It uses 50L6 as a stereo hi fi amp
  41. Chinese 6SN7 300B SE Amp - need help to tweak
  42. Kondo KSL-M77 heater regulator?
  43. Quad II issues
  44. THD measurements keithley 2015 integrated anp
  45. SRPP #56>D3A>EL 156 SE Build.
  46. webcore schematics???
  47. Purpose of LC Circuit going to Output Transformer?
  48. 12ax7+12au7 for DAC i/v
  49. Eico 666 settings for 5670
  50. transconductance conversion
  51. What is the pressure inside a mercury rectifier?
  52. Strange distortion value?
  53. Glass Ware and Pass
  54. Is over or undervolting bad for amps?
  55. Mod an EICO ST-70 or HF-20 into FISHER KX-200?
  56. Paralleled 12AX7's for phono stage
  57. Drive
  58. Telefunken Princess II 5486MX transformer question
  59. DAC in the Amp?
  60. Tube data for the 9AM10
  61. 5687 headphone amp
  62. Marantz Model 9 Prototype.
  63. Motorboating Tubes
  64. Mc Farlow f1mk2
  65. Global Matching of Great Tube WE300B, WE417A...etc
  66. What to do with unused half of triode ?
  67. Dynaco Mk III output transformers
  68. Gu-15
  69. Making a console stereo to a speaker amp?
  70. Strange valve pre amp on ebay.
  71. 833A "budget" design
  72. FU50 tube amp mods and schematic
  73. Tube type W1039 (subs NR27/A or CV1161) - Needs Datasheet, curves and/or info (any)
  74. Audio Research SP6B
  75. VTA PH16 Build
  76. What tubes to use with this Interstage Transformers?
  77. Questions and Problems with Mullard 5-10 clone
  78. semi scratch build; pas 3 board and pwr supply
  79. SHIII project, All-Pentode PP
  80. Battery bias and negative feedback
  81. schematic/kit recommendation for low gain output stage
  82. Help identifying OPT
  83. Getting Started On RCA Console I picked up
  84. Er, what's plate voltage?
  85. 6SN7 DIY preamp suggestions
  86. Hybrid 5.1 SURROUND Tube preamp/Mosfet Amp
  87. Where is the problem in 211 tube power amp.
  88. An Unusual SE Bench Amp
  89. HK A500 restoration log
  90. How many grid stoppers do I need ?
  91. Bogen Console Revamp
  92. Anyone guy with experience in turret cascode TV tuners
  93. Phono stage with remote transformer?
  94. Need help troubleshooting Yamamoto A08S Kit build :-(
  95. Curcio Audio status
  96. Thorens AZ-25 restoration
  97. Question about slew rate of CCS for cathode bias
  98. ASUSA K2003
  99. Good Gravy, This Thing Is HUGE!
  100. Those Pesky triodes
  101. 310A tubes.. Country of origin
  102. Speaker for EL34 SE amp
  103. Advice on power umbilical connectors
  104. Matching valves
  105. output transformer new vs vintage iron
  106. Looking for Dynaco ST-70 Power Supply Info/Specs
  107. Parallel GM70 Amp
  108. Bad repair jobs
  109. 8mV of noise causing havoc in valve pre amp.
  110. Simple 12AX7 gain stage loss of HF - impedance?
  111. 6N7/6CB5A Amplifier - Part 1?
  112. 12AU7 Valve output impedance.
  113. modifying Musical Paradise 300b amp
  114. WE417 replaces 12AX7/12AU7?
  115. Making tubes last longer by lowering Voltage?
  116. Stereo Tube Amp Under 10 Watts Inquiry
  117. World Audio Design KECL82 Schematic
  118. DIY tube preamp with active crossover
  119. Questions re restoring old amp
  120. M2057's, has anyone experimented with these yet????
  121. Question about building amp from AA100 parts
  122. What is a R4A3 type valve?
  123. Seeking a peer review for my preamp design
  124. List of commercial all tube phono preamplifiers
  125. Schaded SE Pentode drive Pentode amp
  126. GM70 IT PP
  127. tube preamp oscillation
  128. What determines the bass response in a Magnavox 93 series amp?
  129. Preamp/Phono Stage Transformer
  130. Yaqin MC10
  131. the small SE UL ECL 805 / EY 82 !!!
  132. Is this ERNIE?
  133. Offering from China
  134. Name that tube manufacturer
  135. Does sunlight affect valve characteristics?
  136. Can we talk about series/pass regulators?
  137. How electrically fragile /robust are valves?
  138. Altec Lansing 345a variant/homebrew
  139. Another newb with a plan-to-build saying hello
  140. What is the closed alternative to CV4002?
  141. A safe Dc coupled amp
  142. 6550b amplifier schematic
  143. Chokes on the old days VS. flter caps
  144. Old tube amp used outside.
  145. Has anyone tried Metglass C-Cores in Audio Transformers ?
  146. Dynaco ST-70 rebuild makes hum when plugged to input, not with shorting plug
  147. 12ax7/5751 - using the full tube or half in gain stage
  148. When is too strong a tube still good ??
  149. Would you say this is good or bad blue glow?
  150. 211 vacuum tube rolling for Air Tight 211
  151. Is it ok to put a valve inside a vented enclosure ?
  152. What phase splitter is this?
  153. 6GK5 as input tube for phono preamp?
  154. Tube bias problems
  155. K12 change transformer
  156. Me and my soon to be amplifier
  157. Pioneer ER-420 tuner dial issue.
  158. Akai M8 Amplifier Mods
  159. The 'every tube' amplifier
  160. EL84 power supply
  161. resistor in HT supply
  162. 5824 (25B6G) output tube
  163. relative impedance of balance pot to volume pot
  164. Glassware Opinions
  165. Tip for searching for schematics
  166. Why is a (power) triode so expensive?
  167. Advise on output transformer vs PP tubes
  168. newbie heater filament issues
  169. Grid-cathode voltage and grid current in 12AX7?
  170. Lafayette LA-240. Schematic please.
  171. A little advice ? Please
  172. CF output stage - float heater or tie to cathode?
  173. Help redesigning schematic from GZ34 to EY200A rectifiers
  174. 12 VAC Aikido, need part numbers
  175. Dynavox VR70
  176. 12BZ7
  177. Troubleshooting 6GU7/KT88 Williamson Amplifier
  178. 12AX7 stand alone preamp output load
  179. Super Triode Connected (STC) chip amp
  180. WE 350B and tube tester
  181. Lundahl LL9202 secondary inductance help
  182. Low noise compromise
  183. RH 6550 SE amplifier
  184. Help substituting power transformer.
  185. acuhorn clone
  186. Low Voltage Tube Head Amp.
  187. Balanced Tube Headphone Amplifier?
  188. Williamson amplifier re-build
  189. Out of the Box: Part 6, a 25W PP UL 6L6GC Monoblock
  190. Grundig External Speaker amplifier IV
  191. Parts for 8audio EL34 Jadis JA30 build
  192. Question about output transformer
  193. Current Shunt
  194. Parafeed L & C calculations wrt Z?
  195. Cathode Bias Resistor and Capacitor Values
  196. Pentone preamp to get some saturation for SS amp
  197. Out of the Box Part 5: SE 6AQ5 Completley Integrated Amp
  198. Forgive Me DIY Audio, For I Have Sinned 10LY8
  199. PSUD II question
  200. Purist Wet Dreams Customized Review
  201. Triodes and feedback theory
  202. Transformer taps
  203. my new philips stereo system!
  204. Phono preamp with modern pentode as first stage
  205. Adding headphone output to Aikido LV
  206. QEE3041 output trafo on tube amps?
  207. 6A3 Cool Amp
  208. Magnavox 175 - different feedback in each channel
  209. Outside the Box, Part 4, a Class AB2 PP 6V6 Amp
  210. 6GF7 and 300B amp
  211. AC filament and ground
  212. Dummy load for tube amp
  213. have i just blown my valve amp?
  214. Sub miniature pentodes - what shall I do with them?
  215. DRD calculator
  216. OTs in parrallel without one tube
  217. Cathodyne investigation - stop the presses!
  218. Special offer for skilled tube fanatics
  219. Heathkit w7-M Power Supply Sidebands
  220. Morrison 300B SET - where to connect current meters?
  221. Could someone look over my schema?
  222. question on 101D tube
  223. Outside the Box- Part lll, Twin Coupled Amp
  224. Thoriated Tungsten Filament 2A3?
  225. Screen resistor sag limiting zener.
  226. Baffling Hum Issue
  227. Can I replace 6H9C (6SL7) with 6SN7?
  228. How Good Is This Amp(Sound Luster)
  229. 6V6 grid-to-ground resistor tone shaping?
  230. Pioneer SX-34B
  231. Outside the Box - Part ll All Triode UL PP Amplifier
  232. How to add Global NFB to a circuit with LED bias and cathode follower?
  233. Heathkit EA-2 customization
  234. cathode feedback transformer and damping factor
  235. Is my 274b/n defective
  236. Need to find 300B tube amp use 6SN7 5U4G >25w/ch
  237. Two SE OPT -> one PP OPT?
  238. Thinking Outside the Box - A Different Kind of Triode Audio Amplifier
  239. Amp Circuits Tutorial
  240. Push pull ecl86 stereo amp
  241. Using a CCS for bias.
  242. Using Telefunken EL-156 in Dynaco Mark III amp
  243. preamplifier with POSITIVE bootstrap feedback
  244. Low Voltage Aikido questions
  245. I had an idea for a SE UL amp with local feedback output stage
  246. Woolgathering
  247. all dht system?
  248. Question - Labeling Tested Tubes
  249. Tube amp inactivity auto-off
  250. High gm version of 12AU7

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