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  1. 6C6-2A3 Amplifier: Changes for 45?
  2. Which rectifier tubes are still manufactured?
  3. transconductance effect on peak power?
  4. Super cheap triode amplifier
  5. OTL designed by Glen Orr AudioXpress
  6. Heater voltages
  7. JC Morrison circuits
  8. Building Valve Amplifier from schematic
  9. CliffUSA VS Cliff UK
  10. Where are and how harmonics generated?
  11. resistors for LT317 heater circuit
  12. Function of R2
  13. balanced input for any amplifier
  14. Spect output peak to peak for 807 SE ul
  15. HK Citation II Output Transformer Data ???
  16. Looking to purchase non-working output transformers
  17. metals!
  18. Another 2A3 build
  19. where r crossline master volumes from?
  20. Output Audio Transformer Impedance
  21. The echo effect of a headphone AMP
  22. flexy -a multirole driver/preamp-
  23. Scott 233 Bias procedure question
  24. What to do with 6DQ6B's?
  25. Goodcomponent - another chinese supplier
  26. Do EL34s in pentode mode PP AB1 sound better with lower screen voltage?
  27. Bogen MX60A as pre-amp
  28. kiwi.baby-huey. And so it begins...
  29. "sustain bias" and other organ amp ?s
  30. max current draw according to loadlines and reality
  31. DHT filament circuit layouts ?
  32. After PP projects new SE project
  33. Gyrator Frequency Response?
  34. converting a dynaco mark IV driver board for headphone amp use
  35. Dared mp30
  36. PP pentode tube headphone amp PCB needed ( 6au6 thru el84)
  37. low wattage valve amps
  38. 6LU8 in Moscode 600
  39. The Octal Preamplifier with Phono section
  40. Which tube does my amp use? 12AU7 12BH7 12AX7 6CG7 others?
  41. Wacky Hum and Harmonics
  42. Constructions of ShuGang's 211 and 805A
  43. Tube ID help needed (EL34?)
  44. 5881, 6V6, EL84, or 7591 for triode-strapped operation?
  45. Strange Grounding Problem - My best guess: ghosts.
  46. High voltages
  47. PAC Perfectionist Audio Component preamp
  48. plate stoppers or cathode stoppers?
  49. Need Spud Amp schematic
  50. 5654 (6ak5) line stage in triode mode
  51. PSU capacitors
  52. Shuguang Treasure 300B-Z
  53. Rogers Cadet III input impedance
  54. Aikido w/ tone controls
  55. UTC Z-2961 input transformer
  56. Please help me improve my headphone amp
  57. Faint Hiss/Hum.
  58. What tubes with 3.3K p2p output?
  59. Strip board project completed.
  60. 6V6 SE VS ECL85
  61. 6v6 PP biasing question
  62. Phone Preamp PSU
  63. How much would a cathode follower drift ?
  64. Strange hum in a Williamson amp
  65. Tube preamp for a TDA2040 chipamp
  66. Heater problem
  67. A couple newbie questions
  68. 100KW Power Amplifier
  69. Excellent NOS Russian 6Pi3C/6N3C (6L6GC) Tubes...
  70. Flea-power class-A2 using a power opamp driver
  71. plate to plate feedback - measurements
  72. DC heat float with 50V bias tap from mains transformer?
  73. repair shop
  74. What to build next?
  75. Fisher X-100-C Output Transformer needed
  76. Schade Feedback
  77. RH807 push pull ?
  78. RIAA lite no.ls37
  79. help I need some addres tube store in amsterdam
  80. 50C5 pentode LTSpice model
  81. "Iron Garter" Push-Pull Amplifier
  82. Mcintosh Mc-3500 sound
  83. A couple of PSD questions
  84. parafeed - Gyrator vs CCS anode load
  85. Compactron amp... LIVES!
  86. Opinions Please
  87. Aikido REV D pcb
  88. New Edcor opt, what would a 150ohm primary be used for?
  89. GM-70, A2, biamping
  90. Espressivo Headphone Amplifier on Budget
  91. Coupling Caps for Aikido ACF Buffer
  92. How to compute current at control grid of power tube?
  93. High voltage SS output, any experiences ?
  94. Back on the forum after a long hiatus 6SN7 Preamp project in the works.
  95. Look for Single Tube scheme
  96. Cathode follower amplifier, push-pull, xformer-coupled
  97. help with "bruce heran" el84 amp S2
  98. Triodes and current flow
  99. Heaters Constant Current Regulator
  100. Driver Tubes: Help Me Decide
  101. Possible tweak
  102. DHT Driving Pentode Output Stage Question
  103. 50C5=50l6; 12av6=12at6
  104. Any experience to drive 805 tube?
  105. Fixed short in a 45
  106. power amp current
  107. Phase inverter/power section
  108. Concerned with current dual 5U4's...
  109. What tube is this?
  110. Signal tube noise!
  111. McIntosh Goodness From Scratch
  112. Fisher Output Transformer ID
  113. Stepped Attenuator for Air Tight ATC-1
  114. The Tube Killer Killer?
  115. Martel FAX-200C
  116. 6n6p headphone amp
  117. Ouput voltage of a triode stage on quiescent state should be zero?
  118. Hum Ho
  119. build a OTL (output-transformerless) amplifier
  120. 6v6 PP maggie with Polk SDA 1C
  121. Stromberg-Carlson AU-32 distortion in preamp
  122. Please Help - LF Peaks/Dips & Clipping
  123. Anybody watching this?
  124. Trying to find an unusual schematic posted here this Spring
  125. If you were going to build a OTL?
  126. Protecting a valve variable LM317 power supply
  127. EL34 PP PROJECT
  128. Matching tubes for PP
  129. Calculate triode strapped characteristics from pentode data?
  130. 6922 Loading Question
  131. corrections for LF and HF peaking
  132. 300bSE journey under way
  133. Why shielded tubes
  134. Aikido LV 6N27P SMPS completed
  135. Tube PS question: Acceptable ripple
  136. Back at the 45 SET
  137. Time to replace my 50 year old filter caps...
  138. Amazingly low distortion -- Radford-based design
  139. To ground or not to ground the OPT secondary, that is the question
  140. Ultralinear Observations and Questions
  141. 6SN7 v 6N8P v 6H8C
  142. NOS radio parts awaiting for my pick up!
  143. Toroidal Transformer Cover
  144. VTV 6sn7 line stage project
  145. can something be made using these tubes
  146. Hampton MC preamp
  147. J-fet - tube DAC analog stage
  148. geloso 3270 power amplifier
  149. Belton micalex tube sockets any experience ?
  150. DeathTrap 500 - An Engineer's approach to the 300B SET
  151. My First Power Supply
  152. 5aR4 Rectifier Problem, Help! Little Long
  153. Electrolytic vs Polypropylene cathode
  154. Size of 5Y3 tubes?
  155. 3C24 really is a fine output tube...
  156. Yaqin MC100B Newbie Questions
  157. JE simple 45 SE grid leak resistor question
  158. 26 vs 27
  159. Bypass the tone control
  160. CCS with VN2222L
  161. European Made 6080/6AS7
  162. PFL200, what can I use them to?
  163. 7W7 tube - how it competes with other pentodes as driver?
  164. 1959 Blaupunkt receiver capacitors -Newbie
  165. i have one 5672 tube (new)
  166. 12ax7 pre amp + solid state power amp
  167. Preamp for Tim Mellow's 6C33C OTL
  168. Power supply buzz
  169. Circuit query
  170. 845/211 driver circuits
  171. A question about the Malanz 7
  172. Looking for four KT90 Ei
  173. Dynaco PAS transformer breakdown
  174. where do you find your tube treasures
  175. 5670 Thoughts?
  176. looking to build or buy a cheep preamp
  177. Trying to achieve 25-30 watts... help please!
  178. RCA Reel to Reel Conversion??
  179. AA5 Tube Radio Design using 2010 Techniques
  180. I found a use for surplus tubes
  181. Edcor CXPP-30-MS-3.8K OPT
  182. Which tube does my amp use? 845 or 211
  183. Coupling cap replacement in series?
  184. electronique practique
  185. New PNP HV tranny for anode CCS
  186. tube reliability
  187. Hybrid dreams
  188. Triode Electronics 30W SE Transformer
  189. SMALL SIZE OUTPUT TRANSFORMERS
  190. headphone amp with 7025?
  191. Separation of preamp and power amp
  192. Aikido 9pin with 6n1p and 6n6p as Headphone
  193. PreAmp output transformers
  194. Line-out on tubes
  195. Would this scheme work ?
  196. differential cascode patented in 2007
  197. Question about AMP185 Rectifier Circuit
  198. correct heater wiring
  199. Speaker snap or crack (no pop)
  200. Very long cables
  201. Help! 2A3 SET quit after hot restart
  202. INTEGRATED HYBRID AMP WITH NO LOAD
  203. 12AX7 preamp on 375V
  204. The Blue Velvet Line Preamp with 7193 instead of 6SN7
  205. Increase idle current on my KT77's?
  206. Yet another nutty idea - don't say I didn't warn
  207. need someone to run a sim in PSUD2...my PC is down and my MAC wont runt the program!!
  208. Building an B-15-inspired amp
  209. China preamp Xiang Sheng 768A
  210. RE: Fisher 200 tube amp fuse blowing issue
  211. How do you match output tubes?
  212. Best Dyna ST-70 rebuild kit?
  213. Help with tube wiring
  214. st70 problem
  215. Help with info on old valve amp
  216. Exceeding V-heater-cathode
  217. Cayin/Sparks A- 50T schematic.
  218. Looking for Bi siemens datasheet
  219. Transformers, transformers, transformers...
  220. Need ideas for my 6V6 from 1946 Blues / rockabilly
  221. Quasi complimentary output stage?
  222. 4ohm output transformer with 8ohm speaker
  223. First DIY project for a good power Amplifier
  224. Cherry red plates
  225. DIY triode
  226. First post/build
  227. New Transformer Vendor In Belgium
  228. KT88 grid stopper
  229. Connecting valve shields to earth
  230. Shindo MAZERIS BELLEVUS MODEL 454-2xAttenuator-How works this Circuit? 6067+12BH7
  231. Fixed bias failure B+ switch off protection
  232. Uses for Quicksilver Transformers
  233. SE amp problem
  234. EL-34 to 6P3S-E
  235. 6922 sepp with Balanced Gains
  236. tubes for these OPT?, pri 1.75Kohm, sec 2.5, 4, 8ohm, taps 20%, weight 4Kg
  237. Turning a 6.3 V secondary into a 5 V secondary on an Antek 2T350
  238. gridchokes/output caps
  239. Can I build an MC30?
  240. Cathodyne: Can someone please help me fill in the blanks ?
  241. help hovland hp200
  242. 6SL7 and 6AS7 PP amplifier, design advice needed
  243. Project: Baldwin Tube Amp...
  244. Power Supply Input Capacitor - JE simple 45 question
  245. Tube output: Voltage or Current source?
  246. Edcor's new E-store website.....finally!
  247. Help complete the 300B schematic
  248. Confusion about a 5Y3GT rectifier
  249. Need advice on 300B circuit
  250. PCB in components

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