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  1. Rogers Cadet III input impedance
  2. Aikido w/ tone controls
  3. UTC Z-2961 input transformer
  4. Please help me improve my headphone amp
  5. Faint Hiss/Hum.
  6. What tubes with 3.3K p2p output?
  7. Strip board project completed.
  8. 6V6 SE VS ECL85
  9. 6v6 PP biasing question
  10. Phone Preamp PSU
  11. How much would a cathode follower drift ?
  12. Strange hum in a Williamson amp
  13. Tube preamp for a TDA2040 chipamp
  14. Heater problem
  15. A couple newbie questions
  16. 100KW Power Amplifier
  17. Excellent NOS Russian 6Pi3C/6N3C (6L6GC) Tubes...
  18. Flea-power class-A2 using a power opamp driver
  19. plate to plate feedback - measurements
  20. DC heat float with 50V bias tap from mains transformer?
  21. repair shop
  22. What to build next?
  23. Fisher X-100-C Output Transformer needed
  24. Schade Feedback
  25. RH807 push pull ?
  26. RIAA lite no.ls37
  27. help I need some addres tube store in amsterdam
  28. Valve curve tracer gm tester
  29. 50C5 pentode LTSpice model
  30. "Iron Garter" Push-Pull Amplifier
  31. Mcintosh Mc-3500 sound
  32. A couple of PSD questions
  33. parafeed - Gyrator vs CCS anode load
  34. Compactron amp... LIVES!
  35. Opinions Please
  36. Aikido REV D pcb
  37. New Edcor opt, what would a 150ohm primary be used for?
  38. GM-70, A2, biamping
  39. Espressivo Headphone Amplifier on Budget
  40. Coupling Caps for Aikido ACF Buffer
  41. How to compute current at control grid of power tube?
  42. High voltage SS output, any experiences ?
  43. Back on the forum after a long hiatus 6SN7 Preamp project in the works.
  44. Look for Single Tube scheme
  45. Cathode follower amplifier, push-pull, xformer-coupled
  46. help with "bruce heran" el84 amp S2
  47. Triodes and current flow
  48. Heaters Constant Current Regulator
  49. Driver Tubes: Help Me Decide
  50. Possible tweak
  51. DHT Driving Pentode Output Stage Question
  52. 50C5=50l6; 12av6=12at6
  53. Any experience to drive 805 tube?
  54. Fixed short in a 45
  55. power amp current
  56. Phase inverter/power section
  57. Concerned with current dual 5U4's...
  58. What tube is this?
  59. Signal tube noise!
  60. McIntosh Goodness From Scratch
  61. Marshall Amp strange wiring
  62. Fisher Output Transformer ID
  63. Stepped Attenuator for Air Tight ATC-1
  64. Caps .
  65. The Tube Killer Killer?
  66. Martel FAX-200C
  67. 6n6p headphone amp
  68. 2 caps vs 1 (adding low value teflon to pio)
  69. Ouput voltage of a triode stage on quiescent state should be zero?
  70. Hum Ho
  71. build a OTL (output-transformerless) amplifier
  72. 6v6 PP maggie with Polk SDA 1C
  73. Stromberg-Carlson AU-32 distortion in preamp
  74. Please Help - LF Peaks/Dips & Clipping
  75. Anybody watching this?
  76. Trying to find an unusual schematic posted here this Spring
  77. If you were going to build a OTL?
  78. Protecting a valve variable LM317 power supply
  79. EL34 PP PROJECT
  80. Matching tubes for PP
  81. Calculate triode strapped characteristics from pentode data?
  82. 6922 Loading Question
  83. corrections for LF and HF peaking
  84. 300bSE journey under way
  85. Why shielded tubes
  86. Aikido LV 6N27P SMPS completed
  87. Tube PS question: Acceptable ripple
  88. Back at the 45 SET
  89. Time to replace my 50 year old filter caps...
  90. Amazingly low distortion -- Radford-based design
  91. To ground or not to ground the OPT secondary, that is the question
  92. Ultralinear Observations and Questions
  93. FEEDBACK DELAY TIME
  94. 6SN7 v 6N8P v 6H8C
  95. NOS radio parts awaiting for my pick up!
  96. Toroidal Transformer Cover
  97. VTV 6sn7 line stage project
  98. can something be made using these tubes
  99. Help! Need tube tester info for 6CW4 Nuvistor
  100. Hampton MC preamp
  101. J-fet - tube DAC analog stage
  102. geloso 3270 power amplifier
  103. Belton micalex tube sockets any experience ?
  104. DeathTrap 500 - An Engineer's approach to the 300B SET
  105. My First Power Supply
  106. 5aR4 Rectifier Problem, Help! Little Long
  107. Electrolytic vs Polypropylene cathode
  108. Size of 5Y3 tubes?
  109. 3C24 really is a fine output tube...
  110. Yaqin MC100B Newbie Questions
  111. JE simple 45 SE grid leak resistor question
  112. 26 vs 27
  113. Bypass the tone control
  114. CCS with VN2222L
  115. Adding a ground with a 3 prong cable and connector
  116. European Made 6080/6AS7
  117. PFL200, what can I use them to?
  118. 7W7 tube - how it competes with other pentodes as driver?
  119. 1959 Blaupunkt receiver capacitors -Newbie
  120. i have one 5672 tube (new)
  121. 12ax7 pre amp + solid state power amp
  122. Preamp for Tim Mellow's 6C33C OTL
  123. Power supply buzz
  124. How to make a PCB with 15 years old Positiv 20
  125. Circuit query
  126. 845/211 driver circuits
  127. A question about the Malanz 7
  128. Looking for four KT90 Ei
  129. Dynaco PAS transformer breakdown
  130. where do you find your tube treasures
  131. 5670 Thoughts?
  132. looking to build or buy a cheep preamp
  133. Trying to achieve 25-30 watts... help please!
  134. RCA Reel to Reel Conversion??
  135. AA5 Tube Radio Design using 2010 Techniques
  136. I found a use for surplus tubes
  137. Edcor CXPP-30-MS-3.8K OPT
  138. Which tube does my amp use? 845 or 211
  139. Coupling cap replacement in series?
  140. electronique practique
  141. New PNP HV tranny for anode CCS
  142. tube reliability
  143. Hybrid dreams
  144. Triode Electronics 30W SE Transformer
  145. SMALL SIZE OUTPUT TRANSFORMERS
  146. headphone amp with 7025?
  147. Separation of preamp and power amp
  148. Aikido 9pin with 6n1p and 6n6p as Headphone
  149. PreAmp output transformers
  150. Line-out on tubes
  151. Would this scheme work ?
  152. differential cascode patented in 2007
  153. Question about AMP185 Rectifier Circuit
  154. correct heater wiring
  155. Speaker snap or crack (no pop)
  156. Very long cables
  157. Help! 2A3 SET quit after hot restart
  158. INTEGRATED HYBRID AMP WITH NO LOAD
  159. ECC88 symbol problem in TINA-TI
  160. 12AX7 preamp on 375V
  161. The Blue Velvet Line Preamp with 7193 instead of 6SN7
  162. Increase idle current on my KT77's?
  163. Yet another nutty idea - don't say I didn't warn
  164. Need help calibrating a Hickok 6000 Chicago
  165. need someone to run a sim in PSUD2...my PC is down and my MAC wont runt the program!!
  166. Building an B-15-inspired amp
  167. China preamp Xiang Sheng 768A
  168. RE: Fisher 200 tube amp fuse blowing issue
  169. How do you match output tubes?
  170. Best Dyna ST-70 rebuild kit?
  171. Help with tube wiring
  172. Decided on Gibson GA 20 need layout drawings etc.
  173. st70 problem
  174. Help with info on old valve amp
  175. Exceeding V-heater-cathode
  176. Cayin/Sparks A- 50T schematic.
  177. Looking for Bi siemens datasheet
  178. Transformers, transformers, transformers...
  179. Need ideas for my 6V6 from 1946 Blues / rockabilly
  180. Quasi complimentary output stage?
  181. 4ohm output transformer with 8ohm speaker
  182. First DIY project for a good power Amplifier
  183. Cherry red plates
  184. DIY triode
  185. First post/build
  186. New Transformer Vendor In Belgium
  187. KT88 grid stopper
  188. Connecting valve shields to earth
  189. Shindo MAZERIS BELLEVUS MODEL 454-2xAttenuator-How works this Circuit? 6067+12BH7
  190. Fixed bias failure B+ switch off protection
  191. Who can tell me where to buy Caddock MS220
  192. Uses for Quicksilver Transformers
  193. SE amp problem
  194. EL-34 to 6P3S-E
  195. 6922 sepp with Balanced Gains
  196. What path to choose for Hamonica amplifier?
  197. tubes for these OPT?, pri 1.75Kohm, sec 2.5, 4, 8ohm, taps 20%, weight 4Kg
  198. Turning a 6.3 V secondary into a 5 V secondary on an Antek 2T350
  199. gridchokes/output caps
  200. Can I build an MC30?
  201. Cathodyne: Can someone please help me fill in the blanks ?
  202. help hovland hp200
  203. 6SL7 and 6AS7 PP amplifier, design advice needed
  204. Project: Baldwin Tube Amp...
  205. Power Supply Input Capacitor - JE simple 45 question
  206. Tube output: Voltage or Current source?
  207. Edcor's new E-store website.....finally!
  208. Help complete the 300B schematic
  209. Confusion about a 5Y3GT rectifier
  210. Need advice on 300B circuit
  211. PCB in components
  212. new 6080 dc pp
  213. Single ended to balanced Aikido with mosfets in buffer position
  214. Simple LED power indicator light circuit?
  215. about 83 mercury rectifier
  216. Aikido Zo Calculation
  217. Line out issue - 1965 Ampeg B-18-N
  218. Pavane/ Psvane 845, 805, 211, 12AX7, 12AU7, 12AT7 and EL84
  219. Is this Telefunken fake or OEM?
  220. About Hmmmmm
  221. PRE-AMP PROJECT SRPP + HEADPHONE AMP
  222. 6BN11 vs 6CB6
  223. Is output stage local feedback necessary?
  224. Tube Longevity
  225. Power triode drive current requirements
  226. OPT Selection Question
  227. Recommend me a 6V6 P-P schematic
  228. Requesting advice on a pre-amp build. I'm working on asking realistic questions.
  229. So, im going to replace the Alps with a PEC...someone help?
  230. 13e1 se "shade" some questions
  231. Pio russian capacitor K42-11...is good ?
  232. My first build VTA ST-120
  233. World Wide Audio, model: HBP-97a, Hybrid Power Amplifier - info needed
  234. DIY 50C5 mini amp...
  235. So you think you have cool tubes?????
  236. Layout
  237. Looking to ID this amp
  238. Help me to make tube amply
  239. CAT SL1 SIGNATURE schematik phono
  240. Have anyone built this 6V6 amp?
  241. GU-50 in Single-Ended Triode Configuration - What bias points?
  242. DC coupling on a LTP? Opinions and help needed on Fred's design.
  243. Power Selection - Help Needed
  244. Which speaker with a 1/4W tube amp?
  245. 6973 VS 6CZ5 substitute
  246. Third Reich tubes
  247. Hello...and another ST-70 project.
  248. Home theater magic smoke...smoked and I think I heard a mirror crack...
  249. Scott LK48-B restoration
  250. 3 - 12AU7 Preamp. Is there such an animal?

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