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

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