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  1. Heathkit W 5M output transformers
  2. 6S19 Circlotron (OTL)
  3. Quality of Hammond 1600 series transformers and a question about loading.
  4. Kuei Yang Wang's 6sn7 linestage
  5. E-mu 0202 + audiotester
  6. Where to buy HT toroids ?
  7. CJ 1.4: Power tubes are working but drivers not ! Help please.
  8. A 6SN7 direct coupled preamp & regulated supply for everyone's perusal.
  9. Slight hum from my new soldering station.
  10. phono stage
  11. 6sn7gtb problem
  12. The old man told me to get it all out of the basement
  13. The Look of Preamp Hum
  14. hookup wire options
  15. Testing Amplifiers / Pad
  16. Which tubes should I use?
  17. KT88s and grid current
  18. Gain stage with g2-feedback.
  19. K-502 Left Channel is out
  20. 12B4 help needed
  21. Power Trans question
  22. Noob amp wiring question...
  23. 5842 - russian ripoff
  24. Ruskie tube questions
  25. Opt placement
  26. 807 AB2 oscillation maybe?
  27. Amazon Does DIY Parts
  28. Shielded wire
  29. Questions about Tube Amplifiers, Mikael's vs SimpleSE
  30. Where low noise resistors matter
  31. funky power supply
  32. Choke loaded PSU versus VR tube regulated PSU?
  33. What would most of you do?
  34. IRFBC20 as source follower drivers for EL34s in AB1 PP
  35. first post, PS for 6em7 SET amp
  36. affordable transformers for KT-88's
  37. Need help with schematic
  38. How many people here use simulators, like LTspice, to help design tube stuff?
  39. newbie question regarding gain reduction
  40. Anybody did try this tube preamp ?
  41. Heathkit UA-2 output tx wiring question
  42. Question about the properties of "matched" tubes
  43. Using a passive direct box to kill ground loop noise?
  44. magnetized power transformer!
  45. Utc A-24
  46. lower cost options for spectrum analyser/ function generator?
  47. Need schematics for Val VP-110S Tube Amp
  48. So What now
  49. What other tubes can I use this OPT for?
  50. Super Junkbox 6S19P SET
  51. Grid stopper resistors
  52. Please evaluate my new EL34 Amp (waveform attached)
  53. Max voltages for EL84?
  54. Oscilloscope Probes for Tube Work
  55. ECC88 vs 6SN7
  56. Good (tube) audio shows in the US?
  57. Please help me de-hum my new pre
  58. Help for newbie
  59. Simple ReAmp Mod? Help with Input Impedances, Please!
  60. Which of these two phono stages
  61. Crosley radio
  62. Small tube amp for headphones/computer speakers?(first post)
  63. Peculiar Fisher circuit
  64. Hum in Grounded Grid Pre
  65. Counterpoint SA-1000
  66. K-502 How to select a potentiometer
  67. What are these Christmas light things?
  68. a CHEAP integrated tube amp kit-anybody?
  69. My amp is acting like a transducer!?
  70. Transformer current question
  71. Brimar date codes?
  72. Home made SE 300B amp
  73. Parallel Push Pull 6AS7 or 6080
  74. random crackle ? (McMartin MA-20)
  75. KT88 filament failure - twice on same socket
  76. Solid State Regulator for tube amp
  77. Proposed screen-drive amp design... comments, please?
  78. Any good explanation of Passive EQ Filters??
  79. terraplane 300B
  80. Sun Audio transformers
  81. Vacuum State RTP5.
  82. Schematics for Audio Innovations s1000 pre
  83. Tube amp for newbye
  84. 3C24SE amp...
  85. Meixing MingDa MC767-RD
  86. confusing transformer connections
  87. Have to mod K-502 to 4Ohms from 8
  88. SOund of 3B28 vs. 866A
  89. S3E Vacuum Tube
  90. Tube audio & "3 dimensionality"
  91. Darling monoblocks
  92. Testing 350B with B & K 747A
  93. Interstage transformer for balanced amp question
  94. Filament transformer questions
  95. dBm or dBV Audio Voltmeter
  96. VTL MB250 Signature monoblock Manual..
  97. Choke phase spliter
  98. Output transformer DC resistance..
  99. Chassis layout?
  100. Jolida schematic questions
  101. Tube Phono preamp kit?
  102. Does size really matter - SE Output
  103. 437A testing
  104. What to do with a 5k output transfomer?
  105. adapter?
  106. Studer 52
  107. Safety ground question
  108. Old PS questions (EL34 replacement), and any Aus people know BWD?
  109. Darling 1626 amp
  110. Blackheart 5 watt
  111. What is this tube amp
  112. Extry, Extry, Blind Squirrel Finds Nut -sequence
  113. Why is distortion harmonic?
  114. Source for OPT
  115. EL34 to RL12P35 converting
  116. calculating total current draw
  117. Allied Radio (Knight) KA-55 schematic
  118. 6F6G Amplifier
  119. good book/article about using oscilloscopes?
  120. how to attach photos
  121. Is 450V the max of triode strapped 6l6gc
  122. Separate power supply - Umbilical Cord
  123. tube amp being weird -- any ideas
  124. need to discharge psu safely
  125. Jadis DA7/defy power amplifier mods
  126. 5.3v on 6SN7 filament?
  127. The Valve Wizard
  128. Mercury vapor rectifier tube question
  129. An Indiana Yankee in Putin's court.
  130. Switching over to a fixed bias
  131. Dynamic load line analysis using music and speaker load
  132. Capacitance in PSU
  133. preamp line ctt
  134. Genalex KT-88 reissue
  135. Combine EF80 with EL84
  136. 2A3 maximum plate voltage
  137. Amplifier Response Stability & All That.
  138. 100k linear pots, any idea?
  139. 6550, 6L6, or 6V6??
  140. grid-stopper resistor
  141. cathode bypass caps suggestions please for newbie
  142. Need Schematic-H&K B.A.T.T.
  143. 6EJ7 phono preamp?
  144. Impressions of the Ella, a pp EL34
  145. 30L15 / PCC805 - What can I use them for?
  146. Ultra Cheap transformers?
  147. Push-pull output impedance
  148. Tube amp cost
  149. 830b
  150. Leak Tl/12+
  151. Toroid Trafo as choke
  152. in search of a 3c33 dual triode.....
  153. Question about MiniBlok II Schematic
  154. Wavebourn Alligator amplifier
  155. Best Tube Testers?
  156. Rusky version EF86
  157. Melos SHA Gold Issue
  158. Erratic tube activity
  159. Bogen Front End
  160. Maybe a Ruskie
  161. Another kind of hybrid
  162. Output impedance
  163. GU29 Amp. Schematic - Audioromy or similar
  164. Power On Indicator Light
  165. Newbie Aikido power supply question
  166. Se output transformer question
  167. Aikido hum
  168. Output transformer replacement... Worth it?
  169. Almarro A205A schematic
  170. Valves World question
  171. diodes before plate load
  172. power tubes..newbie question.
  173. Need Help 12BH7 Tube test.
  174. Tube Virgin
  175. Chassis layout help
  176. Maybe this is why 300b's dont last as long
  177. High-voltage bench power supply
  178. Ebay Tube amp buy disaster
  179. HK cheap SE OTPs...hmmm
  180. Modded ST70 Done
  181. bad buzz in an EL34 amp
  182. Another radio->Gtr amp mod question
  183. yaoin
  184. What is the safest method to plot characteristic curves without ruining the tubes
  185. Screen grid zeners; which?
  186. Another one I don't get
  187. 6BG6GA adapter instructions needed
  188. got an EC8020
  189. Identifying these Valvos.
  190. Converting tube guitar amp to Hi-Fi amp
  191. 21kW audio power amp?
  192. Quicksilver conversion
  193. DC PSU for both 6.3vdc and 5vdc from one 6.3vac transformer?
  194. Hammond Transformers in Montreal/Canada
  195. Can't find data for 8624
  196. Any advice on modifying a 2A3 SET amp to parafeed?
  197. Output impedance for non published PP configuration
  198. Grid stopper resistor required (KT66)?
  199. Ask Jan First OPTs
  200. For what are high mu triodes still useful?
  201. CCa "low noise"?
  202. Upgrading my Audio Research VT 130 SE Tube amp
  203. 100ma FSD voltmeter
  204. Conqueror schematic
  205. Ground reference
  206. Overdriven Capacitor?
  207. Tone Controls?
  208. My first "from scratch" design, SE KT88..........
  209. OPTs of questionable utility
  210. 6336 as a Rectifier
  211. tube power supply
  212. Anyone read Russian?
  213. PSU - dropping resistors?
  214. pre-amp design, just curious about your thoughts here.
  215. Using isolation transformer as a PSU transformer???
  216. KT66 loosing its getter
  217. Mullard schematic?
  218. Mikale Abdellah SE KT88 B+ voltage?
  219. Layout software
  220. Does anyone have any schematics for a parafeed SET amp?
  221. music angel kt88
  222. CB radio
  223. The end of the 300b Dream?
  224. Voltage divider to reduce 6v dc to 2vdc
  225. oil injected rca cables?
  226. Modification.....
  227. CHOKY'S EC8010 preamp
  228. Using a Grid Choke On the 2A3 when the input/driver is a Pentode?
  229. tube checker
  230. 300B tube going dead after a few months
  231. KT88 se build NO GAIN please help
  232. mengyue mini valve amplifier
  233. Preamp suggest, please.
  234. Problem: Severe power transformer and choke vibration
  235. Amp Hack schematic questions
  236. This circuit ok?
  237. Tube ID anyone?
  238. Posted new books and data
  239. The sound of a failing tube rectifier?
  240. Proyect with PL36 and N2P (Russian ECC83)
  241. 300b LTspice model with grid current?
  242. Tri-amp using 2a3 SETs
  243. TentLabs Directly Heated Tubes Supply
  244. Bevois Valley Design Question
  245. Kofi Annan in: "Oscillation Blues"
  246. Common mode choke model
  247. UTC 20 Watt Amp - Any Experience?
  248. 6cz5s for EL84s
  249. The 120Hz Blues...
  250. Grounding points....

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