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  1. Linearity
  2. PSU Transformers for 6922 SRPP tube preamp
  3. 6JN8 curves?
  4. 6C6-2A3 Amplifier: Changes for 45?
  5. Which rectifier tubes are still manufactured?
  6. transconductance effect on peak power?
  7. Good Power Resistores ???
  8. Super cheap triode amplifier
  9. OTL designed by Glen Orr AudioXpress
  10. Heater voltages
  11. wire thickness
  12. JC Morrison circuits
  13. Building Valve Amplifier from schematic
  14. CliffUSA VS Cliff UK
  15. WHERE ARE;AND HOW ARE THE HARMONICS GENERATED?
  16. resistors for LT317 heater circuit
  17. Function of R2
  18. balanced input for any amplifier
  19. Spect output peak to peak for 807 SE ul
  20. HK Citation II Output Transformer Data ???
  21. Looking to purchase non-working output transformers
  22. metals!
  23. Another 2A3 build
  24. where r crossline master volumes from?
  25. Output Audio Transformer Impedance
  26. The echo effect of a headphone AMP
  27. flexy -a multirole driver/preamp-
  28. Scott 233 Bias procedure question
  29. What to do with 6DQ6B's?
  30. Goodcomponent - another chinese supplier
  31. Do EL34s in pentode mode PP AB1 sound better with lower screen voltage?
  32. Bogen MX60A as pre-amp
  33. kiwi.baby-huey. And so it begins...
  34. "sustain bias" and other organ amp ?s
  35. max current draw according to loadlines and reality
  36. Where to buy EI transformer bobbins?
  37. DHT filament circuit layouts ?
  38. After PP projects new SE project
  39. Gyrator Frequency Response?
  40. converting a dynaco mark IV driver board for headphone amp use
  41. Dared mp30
  42. PP pentode tube headphone amp PCB needed ( 6au6 thru el84)
  43. low wattage valve amps
  44. 6LU8 in Moscode 600
  45. The Octal Preamplifier with Phono section
  46. Which tube does my amp use? 12AU7 12BH7 12AX7 6CG7 others?
  47. Wacky Hum and Harmonics
  48. Constructions of ShuGang's 211 and 805A
  49. Tube ID help needed (EL34?)
  50. 5881, 6V6, EL84, or 7591 for triode-strapped operation?
  51. Strange Grounding Problem - My best guess: ghosts.
  52. High voltages
  53. PAC Perfectionist Audio Component preamp
  54. plate stoppers or cathode stoppers?
  55. Need Spud Amp schematic
  56. 5654 (6ak5) line stage in triode mode
  57. PSU capacitors
  58. Shuguang Treasure 300B-Z
  59. Rogers Cadet III input impedance
  60. Aikido w/ tone controls
  61. UTC Z-2961 input transformer
  62. Please help me improve my headphone amp
  63. Faint Hiss/Hum.
  64. What tubes with 3.3K p2p output?
  65. Strip board project completed.
  66. 6V6 SE VS ECL85
  67. 6v6 PP biasing question
  68. Phone Preamp PSU
  69. How much would a cathode follower drift ?
  70. Strange hum in a Williamson amp
  71. Tube preamp for a TDA2040 chipamp
  72. Heater problem
  73. A couple newbie questions
  74. 100KW Power Amplifier
  75. Excellent NOS Russian 6Pi3C/6N3C (6L6GC) Tubes...
  76. Flea-power class-A2 using a power opamp driver
  77. plate to plate feedback - measurements
  78. DC heat float with 50V bias tap from mains transformer?
  79. repair shop
  80. What to build next?
  81. Fisher X-100-C Output Transformer needed
  82. Schade Feedback
  83. RH807 push pull ?
  84. RIAA lite no.ls37
  85. help I need some addres tube store in amsterdam
  86. Valve curve tracer gm tester
  87. 50C5 pentode LTSpice model
  88. "Iron Garter" Push-Pull Amplifier
  89. Mcintosh Mc-3500 sound
  90. A couple of PSD questions
  91. parafeed - Gyrator vs CCS anode load
  92. Compactron amp... LIVES!
  93. Opinions Please
  94. Aikido REV D pcb
  95. New Edcor opt, what would a 150ohm primary be used for?
  96. GM-70, A2, biamping
  97. Espressivo Headphone Amplifier on Budget
  98. Coupling Caps for Aikido ACF Buffer
  99. How to compute current at control grid of power tube?
  100. High voltage SS output, any experiences ?
  101. Back on the forum after a long hiatus 6SN7 Preamp project in the works.
  102. Look for Single Tube scheme
  103. Cathode follower amplifier, push-pull, xformer-coupled
  104. help with "bruce heran" el84 amp S2
  105. Triodes and current flow
  106. Heaters Constant Current Regulator
  107. Driver Tubes: Help Me Decide
  108. Possible tweak
  109. DHT Driving Pentode Output Stage Question
  110. 50C5=50l6; 12av6=12at6
  111. Any experience to drive 805 tube?
  112. Fixed short in a 45
  113. power amp current
  114. Phase inverter/power section
  115. Concerned with current dual 5U4's...
  116. What tube is this?
  117. Signal tube noise!
  118. McIntosh Goodness From Scratch
  119. Fisher Output Transformer ID
  120. Stepped Attenuator for Air Tight ATC-1
  121. The Tube Killer Killer?
  122. Martel FAX-200C
  123. 6n6p headphone amp
  124. 2 caps vs 1 (adding low value teflon to pio)
  125. Ouput voltage of a triode stage on quiescent state should be zero?
  126. Hum Ho
  127. build a OTL (output-transformerless) amplifier
  128. 6v6 PP maggie with Polk SDA 1C
  129. Stromberg-Carlson AU-32 distortion in preamp
  130. Please Help - LF Peaks/Dips & Clipping
  131. Anybody watching this?
  132. Trying to find an unusual schematic posted here this Spring
  133. If you were going to build a OTL?
  134. Protecting a valve variable LM317 power supply
  135. EL34 PP PROJECT
  136. Matching tubes for PP
  137. Calculate triode strapped characteristics from pentode data?
  138. 6922 Loading Question
  139. corrections for LF and HF peaking
  140. 300bSE journey under way
  141. Why shielded tubes
  142. Aikido LV 6N27P SMPS completed
  143. Tube PS question: Acceptable ripple
  144. Back at the 45 SET
  145. Time to replace my 50 year old filter caps...
  146. Amazingly low distortion -- Radford-based design
  147. To ground or not to ground the OPT secondary, that is the question
  148. Ultralinear Observations and Questions
  149. FEEDBACK DELAY TIME
  150. 6SN7 v 6N8P v 6H8C
  151. NOS radio parts awaiting for my pick up!
  152. Toroidal Transformer Cover
  153. VTV 6sn7 line stage project
  154. can something be made using these tubes
  155. Help! Need tube tester info for 6CW4 Nuvistor
  156. Hampton MC preamp
  157. J-fet - tube DAC analog stage
  158. geloso 3270 power amplifier
  159. Belton micalex tube sockets any experience ?
  160. DeathTrap 500 - An Engineer's approach to the 300B SET
  161. My First Power Supply
  162. 5aR4 Rectifier Problem, Help! Little Long
  163. Electrolytic vs Polypropylene cathode
  164. Size of 5Y3 tubes?
  165. 3C24 really is a fine output tube...
  166. Yaqin MC100B Newbie Questions
  167. JE simple 45 SE grid leak resistor question
  168. 26 vs 27
  169. Bypass the tone control
  170. CCS with VN2222L
  171. Adding a ground with a 3 prong cable and connector
  172. European Made 6080/6AS7
  173. PFL200, what can I use them to?
  174. 7W7 tube - how it competes with other pentodes as driver?
  175. 1959 Blaupunkt receiver capacitors -Newbie
  176. i have one 5672 tube (new)
  177. 12ax7 pre amp + solid state power amp
  178. Preamp for Tim Mellow's 6C33C OTL
  179. Power supply buzz
  180. How to make a PCB with 15 years old Positiv 20
  181. Circuit query
  182. 845/211 driver circuits
  183. A question about the Malanz 7
  184. Looking for four KT90 Ei
  185. Dynaco PAS transformer breakdown
  186. where do you find your tube treasures
  187. 5670 Thoughts?
  188. looking to build or buy a cheep preamp
  189. Trying to achieve 25-30 watts... help please!
  190. RCA Reel to Reel Conversion??
  191. AA5 Tube Radio Design using 2010 Techniques
  192. I found a use for surplus tubes
  193. Edcor CXPP-30-MS-3.8K OPT
  194. Which tube does my amp use? 845 or 211
  195. Coupling cap replacement in series?
  196. electronique practique
  197. New PNP HV tranny for anode CCS
  198. tube reliability
  199. Hybrid dreams
  200. Triode Electronics 30W SE Transformer
  201. SMALL SIZE OUTPUT TRANSFORMERS
  202. headphone amp with 7025?
  203. Separation of preamp and power amp
  204. Aikido 9pin with 6n1p and 6n6p as Headphone
  205. PreAmp output transformers
  206. Line-out on tubes
  207. Would this scheme work ?
  208. differential cascode patented in 2007
  209. Question about AMP185 Rectifier Circuit
  210. correct heater wiring
  211. Speaker snap or crack (no pop)
  212. Very long cables
  213. Help! 2A3 SET quit after hot restart
  214. INTEGRATED HYBRID AMP WITH NO LOAD
  215. ECC88 symbol problem in TINA-TI
  216. 12AX7 preamp on 375V
  217. The Blue Velvet Line Preamp with 7193 instead of 6SN7
  218. Increase idle current on my KT77's?
  219. Yet another nutty idea - don't say I didn't warn
  220. Need help calibrating a Hickok 6000 Chicago
  221. need someone to run a sim in PSUD2...my PC is down and my MAC wont runt the program!!
  222. Building an B-15-inspired amp
  223. China preamp Xiang Sheng 768A
  224. RE: Fisher 200 tube amp fuse blowing issue
  225. How do you match output tubes?
  226. Best Dyna ST-70 rebuild kit?
  227. Help with tube wiring
  228. st70 problem
  229. Help with info on old valve amp
  230. Exceeding V-heater-cathode
  231. Cayin/Sparks A- 50T schematic.
  232. Looking for Bi siemens datasheet
  233. Transformers, transformers, transformers...
  234. Need ideas for my 6V6 from 1946 Blues / rockabilly
  235. Quasi complimentary output stage?
  236. 4ohm output transformer with 8ohm speaker
  237. First DIY project for a good power Amplifier
  238. Cherry red plates
  239. DIY triode
  240. First post/build
  241. New Transformer Vendor In Belgium
  242. KT88 grid stopper
  243. Connecting valve shields to earth
  244. Shindo MAZERIS BELLEVUS MODEL 454-2xAttenuator-How works this Circuit? 6067+12BH7
  245. Fixed bias failure B+ switch off protection
  246. Who can tell me where to buy Caddock MS220
  247. Uses for Quicksilver Transformers
  248. SE amp problem
  249. EL-34 to 6P3S-E
  250. 6922 sepp with Balanced Gains

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