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

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