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  1. Stepped Attenuator for Air Tight ATC-1
  2. The Tube Killer Killer?
  3. Martel FAX-200C
  4. 6n6p headphone amp
  5. Ouput voltage of a triode stage on quiescent state should be zero?
  6. Hum Ho
  7. build a OTL (output-transformerless) amplifier
  8. 6v6 PP maggie with Polk SDA 1C
  9. Stromberg-Carlson AU-32 distortion in preamp
  10. Please Help - LF Peaks/Dips & Clipping
  11. Anybody watching this?
  12. Trying to find an unusual schematic posted here this Spring
  13. If you were going to build a OTL?
  14. Protecting a valve variable LM317 power supply
  15. EL34 PP PROJECT
  16. Matching tubes for PP
  17. Calculate triode strapped characteristics from pentode data?
  18. 6922 Loading Question
  19. corrections for LF and HF peaking
  20. 300bSE journey under way
  21. Why shielded tubes
  22. Aikido LV 6N27P SMPS completed
  23. Tube PS question: Acceptable ripple
  24. Back at the 45 SET
  25. Time to replace my 50 year old filter caps...
  26. Amazingly low distortion -- Radford-based design
  27. To ground or not to ground the OPT secondary, that is the question
  28. Ultralinear Observations and Questions
  29. 6SN7 v 6N8P v 6H8C
  30. NOS radio parts awaiting for my pick up!
  31. Toroidal Transformer Cover
  32. VTV 6sn7 line stage project
  33. can something be made using these tubes
  34. Hampton MC preamp
  35. J-fet - tube DAC analog stage
  36. geloso 3270 power amplifier
  37. Belton micalex tube sockets any experience ?
  38. DeathTrap 500 - An Engineer's approach to the 300B SET
  39. My First Power Supply
  40. 5aR4 Rectifier Problem, Help! Little Long
  41. Electrolytic vs Polypropylene cathode
  42. Size of 5Y3 tubes?
  43. 3C24 really is a fine output tube...
  44. Yaqin MC100B Newbie Questions
  45. JE simple 45 SE grid leak resistor question
  46. 26 vs 27
  47. Bypass the tone control
  48. CCS with VN2222L
  49. European Made 6080/6AS7
  50. PFL200, what can I use them to?
  51. 7W7 tube - how it competes with other pentodes as driver?
  52. 1959 Blaupunkt receiver capacitors -Newbie
  53. i have one 5672 tube (new)
  54. 12ax7 pre amp + solid state power amp
  55. Preamp for Tim Mellow's 6C33C OTL
  56. Power supply buzz
  57. Circuit query
  58. 845/211 driver circuits
  59. A question about the Malanz 7
  60. Looking for four KT90 Ei
  61. Dynaco PAS transformer breakdown
  62. where do you find your tube treasures
  63. 5670 Thoughts?
  64. looking to build or buy a cheep preamp
  65. Trying to achieve 25-30 watts... help please!
  66. RCA Reel to Reel Conversion??
  67. AA5 Tube Radio Design using 2010 Techniques
  68. I found a use for surplus tubes
  69. Edcor CXPP-30-MS-3.8K OPT
  70. Which tube does my amp use? 845 or 211
  71. Coupling cap replacement in series?
  72. electronique practique
  73. New PNP HV tranny for anode CCS
  74. tube reliability
  75. Hybrid dreams
  76. Triode Electronics 30W SE Transformer
  77. SMALL SIZE OUTPUT TRANSFORMERS
  78. headphone amp with 7025?
  79. Separation of preamp and power amp
  80. Aikido 9pin with 6n1p and 6n6p as Headphone
  81. PreAmp output transformers
  82. Line-out on tubes
  83. Would this scheme work ?
  84. differential cascode patented in 2007
  85. Question about AMP185 Rectifier Circuit
  86. correct heater wiring
  87. Speaker snap or crack (no pop)
  88. Very long cables
  89. Help! 2A3 SET quit after hot restart
  90. INTEGRATED HYBRID AMP WITH NO LOAD
  91. 12AX7 preamp on 375V
  92. The Blue Velvet Line Preamp with 7193 instead of 6SN7
  93. Increase idle current on my KT77's?
  94. Yet another nutty idea - don't say I didn't warn
  95. need someone to run a sim in PSUD2...my PC is down and my MAC wont runt the program!!
  96. Building an B-15-inspired amp
  97. China preamp Xiang Sheng 768A
  98. RE: Fisher 200 tube amp fuse blowing issue
  99. How do you match output tubes?
  100. Best Dyna ST-70 rebuild kit?
  101. Help with tube wiring
  102. st70 problem
  103. Help with info on old valve amp
  104. Exceeding V-heater-cathode
  105. Cayin/Sparks A- 50T schematic.
  106. Looking for Bi siemens datasheet
  107. Transformers, transformers, transformers...
  108. Need ideas for my 6V6 from 1946 Blues / rockabilly
  109. Quasi complimentary output stage?
  110. 4ohm output transformer with 8ohm speaker
  111. First DIY project for a good power Amplifier
  112. Cherry red plates
  113. DIY triode
  114. First post/build
  115. New Transformer Vendor In Belgium
  116. KT88 grid stopper
  117. Connecting valve shields to earth
  118. Shindo MAZERIS BELLEVUS MODEL 454-2xAttenuator-How works this Circuit? 6067+12BH7
  119. Fixed bias failure B+ switch off protection
  120. Uses for Quicksilver Transformers
  121. SE amp problem
  122. EL-34 to 6P3S-E
  123. 6922 sepp with Balanced Gains
  124. tubes for these OPT?, pri 1.75Kohm, sec 2.5, 4, 8ohm, taps 20%, weight 4Kg
  125. Turning a 6.3 V secondary into a 5 V secondary on an Antek 2T350
  126. gridchokes/output caps
  127. Can I build an MC30?
  128. Cathodyne: Can someone please help me fill in the blanks ?
  129. help hovland hp200
  130. 6SL7 and 6AS7 PP amplifier, design advice needed
  131. Project: Baldwin Tube Amp...
  132. Power Supply Input Capacitor - JE simple 45 question
  133. Tube output: Voltage or Current source?
  134. Edcor's new E-store website.....finally!
  135. Help complete the 300B schematic
  136. Confusion about a 5Y3GT rectifier
  137. Need advice on 300B circuit
  138. PCB in components
  139. new 6080 dc pp
  140. Single ended to balanced Aikido with mosfets in buffer position
  141. about 83 mercury rectifier
  142. Aikido Zo Calculation
  143. Pavane/ Psvane 845, 805, 211, 12AX7, 12AU7, 12AT7 and EL84
  144. Is this Telefunken fake or OEM?
  145. About Hmmmmm
  146. PRE-AMP PROJECT SRPP + HEADPHONE AMP
  147. 6BN11 vs 6CB6
  148. Is output stage local feedback necessary?
  149. Tube Longevity
  150. Power triode drive current requirements
  151. OPT Selection Question
  152. Recommend me a 6V6 P-P schematic
  153. Requesting advice on a pre-amp build. I'm working on asking realistic questions.
  154. 13e1 se "shade" some questions
  155. My first build VTA ST-120
  156. World Wide Audio, model: HBP-97a, Hybrid Power Amplifier - info needed
  157. DIY 50C5 mini amp...
  158. So you think you have cool tubes?????
  159. Layout
  160. Looking to ID this amp
  161. Help me to make tube amply
  162. CAT SL1 SIGNATURE schematik phono
  163. Have anyone built this 6V6 amp?
  164. GU-50 in Single-Ended Triode Configuration - What bias points?
  165. DC coupling on a LTP? Opinions and help needed on Fred's design.
  166. Power Selection - Help Needed
  167. Which speaker with a 1/4W tube amp?
  168. 6973 VS 6CZ5 substitute
  169. Third Reich tubes
  170. Hello...and another ST-70 project.
  171. Home theater magic smoke...smoked and I think I heard a mirror crack...
  172. Scott LK48-B restoration
  173. 3 - 12AU7 Preamp. Is there such an animal?
  174. 300b filament
  175. resistor 880 ohms cathode
  176. Anyone have a Bugle Boy logo
  177. Change of circuit from triode to tetrode
  178. Need upgrade info for my Atma-Sphere Novacron Amps
  179. Whats Vintage Testing Equipment Do YOU Have/Use?
  180. JJ Kt77 Bias?
  181. tube rectified psu
  182. HELP!: my SET amp was turned off without a load and now it sound veiled!
  183. 5842 grid leak
  184. AMI Jukebox speaker impedence question
  185. Advice Needed: "Flabby" Amp Low-End
  186. Aikido transformer coupled output
  187. 12BH7A driver stage help
  188. Audio drive to g2 connected to g1 via 15K0
  189. KT88 SE Complete Kit
  190. Any high-end 6BM8 push pull tube amp schematic ?
  191. How a Triode Works
  192. EL3N substitute
  193. Magnavox AMP-185
  194. Best 6V6G that won't get me divorced..
  195. Shorted EL34 ?
  196. ARC VS60 hum in speaker
  197. Need help for a bias circuit
  198. Eico HF20 Output Txr Questions
  199. A Radford STA15 restoration story
  200. Tube Testing in DC Area
  201. Thorens PR24
  202. Newbie here with a couple questions
  203. 300B SwitchMode filament supply
  204. Mixed bias for balancing unmatched tubes in PPP?
  205. My First DIY Experience: An Aikido/Tetra Preamp
  206. how to test chokes for current and voltage
  207. pictures miniblok 1 and miniblok 2 by fred nachbaur
  208. Help with Aikido Preamp+class d amp
  209. will a PTX without center tap work?
  210. Anyone have information on 300B silvertone tube
  211. 6P14P push pull with low output
  212. passive 30Hz-20kHz Bandpass filter for tube preamp?
  213. My First Amp
  214. Frank's 6sn7 preamp
  215. My new 300B Amp
  216. help troubleshooting gradually distorting tube amp (dropping b+ voltage when hot)
  217. Tube Gear Supply/Surplus in Houston Area
  218. What 2a3 ?
  219. long tailed pair - need more gain
  220. how to bypass the volume pot on my SET amp?
  221. 2 stage AIKIDO
  222. Guys please help me with my Jolida 102B!
  223. Philbrick GAP/R K2-W question
  224. First time baby Huey amplifier build
  225. 6LB6's....
  226. Meng 6PI Biasing Question
  227. AIKIDO LV WON'T START
  228. Under rating of Vertical Sweep Tubes
  229. Simple 845 tube monoblock design
  230. Running on filament only
  231. soft stat
  232. BJT Bias?
  233. Preamp Squeal
  234. Hammond L101 compensation cap
  235. Powering a headphone amplifier with DC filament supply
  236. new to this
  237. miniblok 1 voltage problem
  238. How will this affect my amp?
  239. Tetra Phono Builders...got problems!
  240. yagoolar's tube amp projects
  241. Base material of GEC KT88 Feb 1960
  242. Headphone amp with 6n2p valve on 12V
  243. pcc189 for audio use
  244. Reading material
  245. 2A3 rectifier
  246. 866a valve test
  247. Anybody in the Knoxville area?
  248. Looking for simple Push-Pull tricks (from Baby Huey) #1
  249. Why wire an output transformer as autoformer ? (parafeed)
  250. Measuring unwanted grid current

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