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  1. The echo effect of a headphone AMP
  2. flexy -a multirole driver/preamp-
  3. Scott 233 Bias procedure question
  4. What to do with 6DQ6B's?
  5. Goodcomponent - another chinese supplier
  6. Do EL34s in pentode mode PP AB1 sound better with lower screen voltage?
  7. Bogen MX60A as pre-amp
  8. kiwi.baby-huey. And so it begins...
  9. "sustain bias" and other organ amp ?s
  10. max current draw according to loadlines and reality
  11. Where to buy EI transformer bobbins?
  12. DHT filament circuit layouts ?
  13. After PP projects new SE project
  14. Gyrator Frequency Response?
  15. converting a dynaco mark IV driver board for headphone amp use
  16. Dared mp30
  17. PP pentode tube headphone amp PCB needed ( 6au6 thru el84)
  18. low wattage valve amps
  19. 6LU8 in Moscode 600
  20. The Octal Preamplifier with Phono section
  21. Which tube does my amp use? 12AU7 12BH7 12AX7 6CG7 others?
  22. Wacky Hum and Harmonics
  23. Constructions of ShuGang's 211 and 805A
  24. Tube ID help needed (EL34?)
  25. 5881, 6V6, EL84, or 7591 for triode-strapped operation?
  26. Strange Grounding Problem - My best guess: ghosts.
  27. High voltages
  28. PAC Perfectionist Audio Component preamp
  29. plate stoppers or cathode stoppers?
  30. Need Spud Amp schematic
  31. 5654 (6ak5) line stage in triode mode
  32. PSU capacitors
  33. Shuguang Treasure 300B-Z
  34. Rogers Cadet III input impedance
  35. Aikido w/ tone controls
  36. UTC Z-2961 input transformer
  37. Please help me improve my headphone amp
  38. Faint Hiss/Hum.
  39. What tubes with 3.3K p2p output?
  40. Strip board project completed.
  41. 6V6 SE VS ECL85
  42. 6v6 PP biasing question
  43. Phone Preamp PSU
  44. How much would a cathode follower drift ?
  45. Strange hum in a Williamson amp
  46. Tube preamp for a TDA2040 chipamp
  47. Heater problem
  48. A couple newbie questions
  49. 100KW Power Amplifier
  50. Excellent NOS Russian 6Pi3C/6N3C (6L6GC) Tubes...
  51. Flea-power class-A2 using a power opamp driver
  52. plate to plate feedback - measurements
  53. DC heat float with 50V bias tap from mains transformer?
  54. repair shop
  55. What to build next?
  56. Fisher X-100-C Output Transformer needed
  57. Schade Feedback
  58. RH807 push pull ?
  59. RIAA lite no.ls37
  60. help I need some addres tube store in amsterdam
  61. Valve curve tracer gm tester
  62. 50C5 pentode LTSpice model
  63. "Iron Garter" Push-Pull Amplifier
  64. Mcintosh Mc-3500 sound
  65. A couple of PSD questions
  66. parafeed - Gyrator vs CCS anode load
  67. Compactron amp... LIVES!
  68. Opinions Please
  69. Aikido REV D pcb
  70. New Edcor opt, what would a 150ohm primary be used for?
  71. GM-70, A2, biamping
  72. Espressivo Headphone Amplifier on Budget
  73. Coupling Caps for Aikido ACF Buffer
  74. How to compute current at control grid of power tube?
  75. High voltage SS output, any experiences ?
  76. Back on the forum after a long hiatus 6SN7 Preamp project in the works.
  77. Look for Single Tube scheme
  78. Cathode follower amplifier, push-pull, xformer-coupled
  79. help with "bruce heran" el84 amp S2
  80. Triodes and current flow
  81. Heaters Constant Current Regulator
  82. Driver Tubes: Help Me Decide
  83. Possible tweak
  84. DHT Driving Pentode Output Stage Question
  85. 50C5=50l6; 12av6=12at6
  86. Any experience to drive 805 tube?
  87. Fixed short in a 45
  88. power amp current
  89. Phase inverter/power section
  90. Concerned with current dual 5U4's...
  91. What tube is this?
  92. Signal tube noise!
  93. McIntosh Goodness From Scratch
  94. Marshall Amp strange wiring
  95. Fisher Output Transformer ID
  96. Stepped Attenuator for Air Tight ATC-1
  97. Caps .
  98. The Tube Killer Killer?
  99. Martel FAX-200C
  100. 6n6p headphone amp
  101. 2 caps vs 1 (adding low value teflon to pio)
  102. Ouput voltage of a triode stage on quiescent state should be zero?
  103. Hum Ho
  104. build a OTL (output-transformerless) amplifier
  105. 6v6 PP maggie with Polk SDA 1C
  106. Stromberg-Carlson AU-32 distortion in preamp
  107. Please Help - LF Peaks/Dips & Clipping
  108. Anybody watching this?
  109. Trying to find an unusual schematic posted here this Spring
  110. If you were going to build a OTL?
  111. Protecting a valve variable LM317 power supply
  112. EL34 PP PROJECT
  113. Matching tubes for PP
  114. Calculate triode strapped characteristics from pentode data?
  115. 6922 Loading Question
  116. corrections for LF and HF peaking
  117. 300bSE journey under way
  118. Why shielded tubes
  119. Aikido LV 6N27P SMPS completed
  120. Tube PS question: Acceptable ripple
  121. Back at the 45 SET
  122. Time to replace my 50 year old filter caps...
  123. Amazingly low distortion -- Radford-based design
  124. To ground or not to ground the OPT secondary, that is the question
  125. Ultralinear Observations and Questions
  126. FEEDBACK DELAY TIME
  127. 6SN7 v 6N8P v 6H8C
  128. NOS radio parts awaiting for my pick up!
  129. Toroidal Transformer Cover
  130. VTV 6sn7 line stage project
  131. can something be made using these tubes
  132. Help! Need tube tester info for 6CW4 Nuvistor
  133. Hampton MC preamp
  134. J-fet - tube DAC analog stage
  135. geloso 3270 power amplifier
  136. Belton micalex tube sockets any experience ?
  137. DeathTrap 500 - An Engineer's approach to the 300B SET
  138. My First Power Supply
  139. 5aR4 Rectifier Problem, Help! Little Long
  140. Electrolytic vs Polypropylene cathode
  141. Size of 5Y3 tubes?
  142. 3C24 really is a fine output tube...
  143. Yaqin MC100B Newbie Questions
  144. JE simple 45 SE grid leak resistor question
  145. 26 vs 27
  146. Bypass the tone control
  147. CCS with VN2222L
  148. Adding a ground with a 3 prong cable and connector
  149. European Made 6080/6AS7
  150. PFL200, what can I use them to?
  151. 7W7 tube - how it competes with other pentodes as driver?
  152. 1959 Blaupunkt receiver capacitors -Newbie
  153. i have one 5672 tube (new)
  154. 12ax7 pre amp + solid state power amp
  155. Preamp for Tim Mellow's 6C33C OTL
  156. Power supply buzz
  157. How to make a PCB with 15 years old Positiv 20
  158. Circuit query
  159. 845/211 driver circuits
  160. A question about the Malanz 7
  161. Looking for four KT90 Ei
  162. Dynaco PAS transformer breakdown
  163. where do you find your tube treasures
  164. 5670 Thoughts?
  165. looking to build or buy a cheep preamp
  166. Trying to achieve 25-30 watts... help please!
  167. RCA Reel to Reel Conversion??
  168. AA5 Tube Radio Design using 2010 Techniques
  169. I found a use for surplus tubes
  170. Edcor CXPP-30-MS-3.8K OPT
  171. Which tube does my amp use? 845 or 211
  172. Coupling cap replacement in series?
  173. electronique practique
  174. New PNP HV tranny for anode CCS
  175. tube reliability
  176. Hybrid dreams
  177. Triode Electronics 30W SE Transformer
  178. SMALL SIZE OUTPUT TRANSFORMERS
  179. headphone amp with 7025?
  180. Separation of preamp and power amp
  181. Aikido 9pin with 6n1p and 6n6p as Headphone
  182. PreAmp output transformers
  183. Line-out on tubes
  184. Would this scheme work ?
  185. differential cascode patented in 2007
  186. Question about AMP185 Rectifier Circuit
  187. correct heater wiring
  188. Speaker snap or crack (no pop)
  189. Very long cables
  190. Help! 2A3 SET quit after hot restart
  191. INTEGRATED HYBRID AMP WITH NO LOAD
  192. ECC88 symbol problem in TINA-TI
  193. 12AX7 preamp on 375V
  194. The Blue Velvet Line Preamp with 7193 instead of 6SN7
  195. Increase idle current on my KT77's?
  196. Yet another nutty idea - don't say I didn't warn
  197. Need help calibrating a Hickok 6000 Chicago
  198. need someone to run a sim in PSUD2...my PC is down and my MAC wont runt the program!!
  199. Building an B-15-inspired amp
  200. China preamp Xiang Sheng 768A
  201. RE: Fisher 200 tube amp fuse blowing issue
  202. How do you match output tubes?
  203. Best Dyna ST-70 rebuild kit?
  204. Help with tube wiring
  205. Decided on Gibson GA 20 need layout drawings etc.
  206. st70 problem
  207. Help with info on old valve amp
  208. Exceeding V-heater-cathode
  209. Cayin/Sparks A- 50T schematic.
  210. Looking for Bi siemens datasheet
  211. Transformers, transformers, transformers...
  212. Need ideas for my 6V6 from 1946 Blues / rockabilly
  213. Quasi complimentary output stage?
  214. 4ohm output transformer with 8ohm speaker
  215. First DIY project for a good power Amplifier
  216. Cherry red plates
  217. DIY triode
  218. First post/build
  219. New Transformer Vendor In Belgium
  220. KT88 grid stopper
  221. Connecting valve shields to earth
  222. Shindo MAZERIS BELLEVUS MODEL 454-2xAttenuator-How works this Circuit? 6067+12BH7
  223. Fixed bias failure B+ switch off protection
  224. Who can tell me where to buy Caddock MS220
  225. Uses for Quicksilver Transformers
  226. SE amp problem
  227. EL-34 to 6P3S-E
  228. 6922 sepp with Balanced Gains
  229. What path to choose for Hamonica amplifier?
  230. tubes for these OPT?, pri 1.75Kohm, sec 2.5, 4, 8ohm, taps 20%, weight 4Kg
  231. Turning a 6.3 V secondary into a 5 V secondary on an Antek 2T350
  232. gridchokes/output caps
  233. Can I build an MC30?
  234. Cathodyne: Can someone please help me fill in the blanks ?
  235. help hovland hp200
  236. 6SL7 and 6AS7 PP amplifier, design advice needed
  237. Project: Baldwin Tube Amp...
  238. Power Supply Input Capacitor - JE simple 45 question
  239. Tube output: Voltage or Current source?
  240. Edcor's new E-store website.....finally!
  241. Help complete the 300B schematic
  242. Confusion about a 5Y3GT rectifier
  243. Need advice on 300B circuit
  244. PCB in components
  245. new 6080 dc pp
  246. Single ended to balanced Aikido with mosfets in buffer position
  247. Simple LED power indicator light circuit?
  248. about 83 mercury rectifier
  249. Aikido Zo Calculation
  250. Line out issue - 1965 Ampeg B-18-N

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