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  1. Please help me improve my headphone amp
  2. Faint Hiss/Hum.
  3. What tubes with 3.3K p2p output?
  4. Strip board project completed.
  5. 6V6 SE VS ECL85
  6. 6v6 PP biasing question
  7. Phone Preamp PSU
  8. How much would a cathode follower drift ?
  9. Strange hum in a Williamson amp
  10. Tube preamp for a TDA2040 chipamp
  11. Heater problem
  12. A couple newbie questions
  13. 100KW Power Amplifier
  14. Excellent NOS Russian 6Pi3C/6N3C (6L6GC) Tubes...
  15. Flea-power class-A2 using a power opamp driver
  16. plate to plate feedback - measurements
  17. DC heat float with 50V bias tap from mains transformer?
  18. repair shop
  19. What to build next?
  20. Fisher X-100-C Output Transformer needed
  21. Schade Feedback
  22. RH807 push pull ?
  23. RIAA lite no.ls37
  24. help I need some addres tube store in amsterdam
  25. Valve curve tracer gm tester
  26. 50C5 pentode LTSpice model
  27. "Iron Garter" Push-Pull Amplifier
  28. Mcintosh Mc-3500 sound
  29. A couple of PSD questions
  30. parafeed - Gyrator vs CCS anode load
  31. Compactron amp... LIVES!
  32. Opinions Please
  33. Aikido REV D pcb
  34. New Edcor opt, what would a 150ohm primary be used for?
  35. GM-70, A2, biamping
  36. Espressivo Headphone Amplifier on Budget
  37. Coupling Caps for Aikido ACF Buffer
  38. How to compute current at control grid of power tube?
  39. High voltage SS output, any experiences ?
  40. Back on the forum after a long hiatus 6SN7 Preamp project in the works.
  41. Look for Single Tube scheme
  42. Cathode follower amplifier, push-pull, xformer-coupled
  43. help with "bruce heran" el84 amp S2
  44. Triodes and current flow
  45. Heaters Constant Current Regulator
  46. Driver Tubes: Help Me Decide
  47. Possible tweak
  48. DHT Driving Pentode Output Stage Question
  49. 50C5=50l6; 12av6=12at6
  50. Any experience to drive 805 tube?
  51. Fixed short in a 45
  52. power amp current
  53. Phase inverter/power section
  54. Concerned with current dual 5U4's...
  55. What tube is this?
  56. Signal tube noise!
  57. McIntosh Goodness From Scratch
  58. Marshall Amp strange wiring
  59. Fisher Output Transformer ID
  60. Stepped Attenuator for Air Tight ATC-1
  61. Caps .
  62. The Tube Killer Killer?
  63. Martel FAX-200C
  64. 6n6p headphone amp
  65. 2 caps vs 1 (adding low value teflon to pio)
  66. Ouput voltage of a triode stage on quiescent state should be zero?
  67. Hum Ho
  68. build a OTL (output-transformerless) amplifier
  69. 6v6 PP maggie with Polk SDA 1C
  70. Stromberg-Carlson AU-32 distortion in preamp
  71. Please Help - LF Peaks/Dips & Clipping
  72. Anybody watching this?
  73. Trying to find an unusual schematic posted here this Spring
  74. If you were going to build a OTL?
  75. Protecting a valve variable LM317 power supply
  76. EL34 PP PROJECT
  77. Matching tubes for PP
  78. Calculate triode strapped characteristics from pentode data?
  79. 6922 Loading Question
  80. corrections for LF and HF peaking
  81. 300bSE journey under way
  82. Why shielded tubes
  83. Aikido LV 6N27P SMPS completed
  84. Tube PS question: Acceptable ripple
  85. Back at the 45 SET
  86. Time to replace my 50 year old filter caps...
  87. Amazingly low distortion -- Radford-based design
  88. To ground or not to ground the OPT secondary, that is the question
  89. Ultralinear Observations and Questions
  90. FEEDBACK DELAY TIME
  91. 6SN7 v 6N8P v 6H8C
  92. NOS radio parts awaiting for my pick up!
  93. Toroidal Transformer Cover
  94. VTV 6sn7 line stage project
  95. can something be made using these tubes
  96. Help! Need tube tester info for 6CW4 Nuvistor
  97. Hampton MC preamp
  98. J-fet - tube DAC analog stage
  99. geloso 3270 power amplifier
  100. Belton micalex tube sockets any experience ?
  101. DeathTrap 500 - An Engineer's approach to the 300B SET
  102. My First Power Supply
  103. 5aR4 Rectifier Problem, Help! Little Long
  104. Electrolytic vs Polypropylene cathode
  105. Size of 5Y3 tubes?
  106. 3C24 really is a fine output tube...
  107. Yaqin MC100B Newbie Questions
  108. JE simple 45 SE grid leak resistor question
  109. 26 vs 27
  110. Bypass the tone control
  111. CCS with VN2222L
  112. Adding a ground with a 3 prong cable and connector
  113. European Made 6080/6AS7
  114. PFL200, what can I use them to?
  115. 7W7 tube - how it competes with other pentodes as driver?
  116. 1959 Blaupunkt receiver capacitors -Newbie
  117. i have one 5672 tube (new)
  118. 12ax7 pre amp + solid state power amp
  119. Preamp for Tim Mellow's 6C33C OTL
  120. Power supply buzz
  121. How to make a PCB with 15 years old Positiv 20
  122. Circuit query
  123. 845/211 driver circuits
  124. A question about the Malanz 7
  125. Looking for four KT90 Ei
  126. Dynaco PAS transformer breakdown
  127. where do you find your tube treasures
  128. 5670 Thoughts?
  129. looking to build or buy a cheep preamp
  130. Trying to achieve 25-30 watts... help please!
  131. RCA Reel to Reel Conversion??
  132. AA5 Tube Radio Design using 2010 Techniques
  133. I found a use for surplus tubes
  134. Edcor CXPP-30-MS-3.8K OPT
  135. Which tube does my amp use? 845 or 211
  136. Coupling cap replacement in series?
  137. electronique practique
  138. New PNP HV tranny for anode CCS
  139. tube reliability
  140. Hybrid dreams
  141. Triode Electronics 30W SE Transformer
  142. SMALL SIZE OUTPUT TRANSFORMERS
  143. headphone amp with 7025?
  144. Separation of preamp and power amp
  145. Aikido 9pin with 6n1p and 6n6p as Headphone
  146. PreAmp output transformers
  147. Line-out on tubes
  148. Would this scheme work ?
  149. differential cascode patented in 2007
  150. Question about AMP185 Rectifier Circuit
  151. correct heater wiring
  152. Speaker snap or crack (no pop)
  153. Very long cables
  154. Help! 2A3 SET quit after hot restart
  155. INTEGRATED HYBRID AMP WITH NO LOAD
  156. ECC88 symbol problem in TINA-TI
  157. 12AX7 preamp on 375V
  158. The Blue Velvet Line Preamp with 7193 instead of 6SN7
  159. Increase idle current on my KT77's?
  160. Yet another nutty idea - don't say I didn't warn
  161. Need help calibrating a Hickok 6000 Chicago
  162. need someone to run a sim in PSUD2...my PC is down and my MAC wont runt the program!!
  163. Building an B-15-inspired amp
  164. China preamp Xiang Sheng 768A
  165. RE: Fisher 200 tube amp fuse blowing issue
  166. How do you match output tubes?
  167. Best Dyna ST-70 rebuild kit?
  168. Help with tube wiring
  169. Decided on Gibson GA 20 need layout drawings etc.
  170. st70 problem
  171. Help with info on old valve amp
  172. Exceeding V-heater-cathode
  173. Cayin/Sparks A- 50T schematic.
  174. Looking for Bi siemens datasheet
  175. Transformers, transformers, transformers...
  176. Need ideas for my 6V6 from 1946 Blues / rockabilly
  177. Quasi complimentary output stage?
  178. 4ohm output transformer with 8ohm speaker
  179. First DIY project for a good power Amplifier
  180. Cherry red plates
  181. DIY triode
  182. First post/build
  183. New Transformer Vendor In Belgium
  184. KT88 grid stopper
  185. Connecting valve shields to earth
  186. Shindo MAZERIS BELLEVUS MODEL 454-2xAttenuator-How works this Circuit? 6067+12BH7
  187. Fixed bias failure B+ switch off protection
  188. Who can tell me where to buy Caddock MS220
  189. Uses for Quicksilver Transformers
  190. SE amp problem
  191. EL-34 to 6P3S-E
  192. 6922 sepp with Balanced Gains
  193. What path to choose for Hamonica amplifier?
  194. tubes for these OPT?, pri 1.75Kohm, sec 2.5, 4, 8ohm, taps 20%, weight 4Kg
  195. Turning a 6.3 V secondary into a 5 V secondary on an Antek 2T350
  196. gridchokes/output caps
  197. Can I build an MC30?
  198. Cathodyne: Can someone please help me fill in the blanks ?
  199. help hovland hp200
  200. 6SL7 and 6AS7 PP amplifier, design advice needed
  201. Project: Baldwin Tube Amp...
  202. Power Supply Input Capacitor - JE simple 45 question
  203. Tube output: Voltage or Current source?
  204. Edcor's new E-store website.....finally!
  205. Help complete the 300B schematic
  206. Confusion about a 5Y3GT rectifier
  207. Need advice on 300B circuit
  208. PCB in components
  209. new 6080 dc pp
  210. Single ended to balanced Aikido with mosfets in buffer position
  211. Simple LED power indicator light circuit?
  212. about 83 mercury rectifier
  213. Aikido Zo Calculation
  214. Line out issue - 1965 Ampeg B-18-N
  215. Pavane/ Psvane 845, 805, 211, 12AX7, 12AU7, 12AT7 and EL84
  216. Is this Telefunken fake or OEM?
  217. About Hmmmmm
  218. PRE-AMP PROJECT SRPP + HEADPHONE AMP
  219. 6BN11 vs 6CB6
  220. Is output stage local feedback necessary?
  221. Tube Longevity
  222. Power triode drive current requirements
  223. OPT Selection Question
  224. Recommend me a 6V6 P-P schematic
  225. Requesting advice on a pre-amp build. I'm working on asking realistic questions.
  226. So, im going to replace the Alps with a PEC...someone help?
  227. 13e1 se "shade" some questions
  228. Pio russian capacitor K42-11...is good ?
  229. My first build VTA ST-120
  230. World Wide Audio, model: HBP-97a, Hybrid Power Amplifier - info needed
  231. DIY 50C5 mini amp...
  232. So you think you have cool tubes?????
  233. Layout
  234. Looking to ID this amp
  235. Help me to make tube amply
  236. CAT SL1 SIGNATURE schematik phono
  237. Have anyone built this 6V6 amp?
  238. GU-50 in Single-Ended Triode Configuration - What bias points?
  239. DC coupling on a LTP? Opinions and help needed on Fred's design.
  240. Power Selection - Help Needed
  241. Which speaker with a 1/4W tube amp?
  242. 6973 VS 6CZ5 substitute
  243. Third Reich tubes
  244. Hello...and another ST-70 project.
  245. Home theater magic smoke...smoked and I think I heard a mirror crack...
  246. Scott LK48-B restoration
  247. 3 - 12AU7 Preamp. Is there such an animal?
  248. 300b filament
  249. resistor 880 ohms cathode
  250. Anyone have a Bugle Boy logo

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