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  1. Super cheap triode amplifier
  2. OTL designed by Glen Orr AudioXpress
  3. Heater voltages
  4. wire thickness
  5. JC Morrison circuits
  6. Building Valve Amplifier from schematic
  7. CliffUSA VS Cliff UK
  8. WHERE ARE;AND HOW ARE THE HARMONICS GENERATED?
  9. resistors for LT317 heater circuit
  10. Function of R2
  11. balanced input for any amplifier
  12. Spect output peak to peak for 807 SE ul
  13. HK Citation II Output Transformer Data ???
  14. Looking to purchase non-working output transformers
  15. metals!
  16. Another 2A3 build
  17. where r crossline master volumes from?
  18. Output Audio Transformer Impedance
  19. The echo effect of a headphone AMP
  20. flexy -a multirole driver/preamp-
  21. Scott 233 Bias procedure question
  22. What to do with 6DQ6B's?
  23. Goodcomponent - another chinese supplier
  24. Do EL34s in pentode mode PP AB1 sound better with lower screen voltage?
  25. Bogen MX60A as pre-amp
  26. kiwi.baby-huey. And so it begins...
  27. "sustain bias" and other organ amp ?s
  28. max current draw according to loadlines and reality
  29. Where to buy EI transformer bobbins?
  30. DHT filament circuit layouts ?
  31. After PP projects new SE project
  32. Gyrator Frequency Response?
  33. converting a dynaco mark IV driver board for headphone amp use
  34. Dared mp30
  35. PP pentode tube headphone amp PCB needed ( 6au6 thru el84)
  36. low wattage valve amps
  37. 6LU8 in Moscode 600
  38. The Octal Preamplifier with Phono section
  39. Which tube does my amp use? 12AU7 12BH7 12AX7 6CG7 others?
  40. Wacky Hum and Harmonics
  41. Constructions of ShuGang's 211 and 805A
  42. Tube ID help needed (EL34?)
  43. 5881, 6V6, EL84, or 7591 for triode-strapped operation?
  44. Strange Grounding Problem - My best guess: ghosts.
  45. High voltages
  46. PAC Perfectionist Audio Component preamp
  47. plate stoppers or cathode stoppers?
  48. Need Spud Amp schematic
  49. 5654 (6ak5) line stage in triode mode
  50. PSU capacitors
  51. Shuguang Treasure 300B-Z
  52. Rogers Cadet III input impedance
  53. Aikido w/ tone controls
  54. UTC Z-2961 input transformer
  55. Please help me improve my headphone amp
  56. Faint Hiss/Hum.
  57. What tubes with 3.3K p2p output?
  58. Strip board project completed.
  59. 6V6 SE VS ECL85
  60. 6v6 PP biasing question
  61. Phone Preamp PSU
  62. How much would a cathode follower drift ?
  63. Strange hum in a Williamson amp
  64. Tube preamp for a TDA2040 chipamp
  65. Heater problem
  66. A couple newbie questions
  67. 100KW Power Amplifier
  68. Excellent NOS Russian 6Pi3C/6N3C (6L6GC) Tubes...
  69. Flea-power class-A2 using a power opamp driver
  70. plate to plate feedback - measurements
  71. DC heat float with 50V bias tap from mains transformer?
  72. repair shop
  73. What to build next?
  74. Fisher X-100-C Output Transformer needed
  75. Schade Feedback
  76. RH807 push pull ?
  77. RIAA lite no.ls37
  78. help I need some addres tube store in amsterdam
  79. Valve curve tracer gm tester
  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. Marshall Amp strange wiring
  113. Fisher Output Transformer ID
  114. Stepped Attenuator for Air Tight ATC-1
  115. Caps .
  116. The Tube Killer Killer?
  117. Martel FAX-200C
  118. 6n6p headphone amp
  119. 2 caps vs 1 (adding low value teflon to pio)
  120. Ouput voltage of a triode stage on quiescent state should be zero?
  121. Hum Ho
  122. build a OTL (output-transformerless) amplifier
  123. 6v6 PP maggie with Polk SDA 1C
  124. Stromberg-Carlson AU-32 distortion in preamp
  125. Please Help - LF Peaks/Dips & Clipping
  126. Anybody watching this?
  127. Trying to find an unusual schematic posted here this Spring
  128. If you were going to build a OTL?
  129. Protecting a valve variable LM317 power supply
  130. EL34 PP PROJECT
  131. Matching tubes for PP
  132. Calculate triode strapped characteristics from pentode data?
  133. 6922 Loading Question
  134. corrections for LF and HF peaking
  135. 300bSE journey under way
  136. Why shielded tubes
  137. Aikido LV 6N27P SMPS completed
  138. Tube PS question: Acceptable ripple
  139. Back at the 45 SET
  140. Time to replace my 50 year old filter caps...
  141. Amazingly low distortion -- Radford-based design
  142. To ground or not to ground the OPT secondary, that is the question
  143. Ultralinear Observations and Questions
  144. FEEDBACK DELAY TIME
  145. 6SN7 v 6N8P v 6H8C
  146. NOS radio parts awaiting for my pick up!
  147. Toroidal Transformer Cover
  148. VTV 6sn7 line stage project
  149. can something be made using these tubes
  150. Help! Need tube tester info for 6CW4 Nuvistor
  151. Hampton MC preamp
  152. J-fet - tube DAC analog stage
  153. geloso 3270 power amplifier
  154. Belton micalex tube sockets any experience ?
  155. DeathTrap 500 - An Engineer's approach to the 300B SET
  156. My First Power Supply
  157. 5aR4 Rectifier Problem, Help! Little Long
  158. Electrolytic vs Polypropylene cathode
  159. Size of 5Y3 tubes?
  160. 3C24 really is a fine output tube...
  161. Yaqin MC100B Newbie Questions
  162. JE simple 45 SE grid leak resistor question
  163. 26 vs 27
  164. Bypass the tone control
  165. CCS with VN2222L
  166. Adding a ground with a 3 prong cable and connector
  167. European Made 6080/6AS7
  168. PFL200, what can I use them to?
  169. 7W7 tube - how it competes with other pentodes as driver?
  170. 1959 Blaupunkt receiver capacitors -Newbie
  171. i have one 5672 tube (new)
  172. 12ax7 pre amp + solid state power amp
  173. Preamp for Tim Mellow's 6C33C OTL
  174. Power supply buzz
  175. How to make a PCB with 15 years old Positiv 20
  176. Circuit query
  177. 845/211 driver circuits
  178. A question about the Malanz 7
  179. Looking for four KT90 Ei
  180. Dynaco PAS transformer breakdown
  181. where do you find your tube treasures
  182. 5670 Thoughts?
  183. looking to build or buy a cheep preamp
  184. Trying to achieve 25-30 watts... help please!
  185. RCA Reel to Reel Conversion??
  186. AA5 Tube Radio Design using 2010 Techniques
  187. I found a use for surplus tubes
  188. Edcor CXPP-30-MS-3.8K OPT
  189. Which tube does my amp use? 845 or 211
  190. Coupling cap replacement in series?
  191. electronique practique
  192. New PNP HV tranny for anode CCS
  193. tube reliability
  194. Hybrid dreams
  195. Triode Electronics 30W SE Transformer
  196. SMALL SIZE OUTPUT TRANSFORMERS
  197. headphone amp with 7025?
  198. Separation of preamp and power amp
  199. Aikido 9pin with 6n1p and 6n6p as Headphone
  200. PreAmp output transformers
  201. Line-out on tubes
  202. Would this scheme work ?
  203. differential cascode patented in 2007
  204. Question about AMP185 Rectifier Circuit
  205. correct heater wiring
  206. Speaker snap or crack (no pop)
  207. Very long cables
  208. Help! 2A3 SET quit after hot restart
  209. INTEGRATED HYBRID AMP WITH NO LOAD
  210. ECC88 symbol problem in TINA-TI
  211. 12AX7 preamp on 375V
  212. The Blue Velvet Line Preamp with 7193 instead of 6SN7
  213. Increase idle current on my KT77's?
  214. Yet another nutty idea - don't say I didn't warn
  215. Need help calibrating a Hickok 6000 Chicago
  216. need someone to run a sim in PSUD2...my PC is down and my MAC wont runt the program!!
  217. Building an B-15-inspired amp
  218. China preamp Xiang Sheng 768A
  219. RE: Fisher 200 tube amp fuse blowing issue
  220. How do you match output tubes?
  221. Best Dyna ST-70 rebuild kit?
  222. Help with tube wiring
  223. Decided on Gibson GA 20 need layout drawings etc.
  224. st70 problem
  225. Help with info on old valve amp
  226. Exceeding V-heater-cathode
  227. Cayin/Sparks A- 50T schematic.
  228. Looking for Bi siemens datasheet
  229. Transformers, transformers, transformers...
  230. Need ideas for my 6V6 from 1946 Blues / rockabilly
  231. Quasi complimentary output stage?
  232. 4ohm output transformer with 8ohm speaker
  233. First DIY project for a good power Amplifier
  234. Cherry red plates
  235. DIY triode
  236. First post/build
  237. New Transformer Vendor In Belgium
  238. KT88 grid stopper
  239. Connecting valve shields to earth
  240. Shindo MAZERIS BELLEVUS MODEL 454-2xAttenuator-How works this Circuit? 6067+12BH7
  241. Fixed bias failure B+ switch off protection
  242. Who can tell me where to buy Caddock MS220
  243. Uses for Quicksilver Transformers
  244. SE amp problem
  245. EL-34 to 6P3S-E
  246. 6922 sepp with Balanced Gains
  247. What path to choose for Hamonica amplifier?
  248. tubes for these OPT?, pri 1.75Kohm, sec 2.5, 4, 8ohm, taps 20%, weight 4Kg
  249. Turning a 6.3 V secondary into a 5 V secondary on an Antek 2T350
  250. gridchokes/output caps

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