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  1. OTL designed by Glen Orr AudioXpress
  2. Heater voltages
  3. wire thickness
  4. JC Morrison circuits
  5. Building Valve Amplifier from schematic
  6. CliffUSA VS Cliff UK
  7. WHERE ARE;AND HOW ARE THE HARMONICS GENERATED?
  8. resistors for LT317 heater circuit
  9. Function of R2
  10. balanced input for any amplifier
  11. Spect output peak to peak for 807 SE ul
  12. HK Citation II Output Transformer Data ???
  13. Looking to purchase non-working output transformers
  14. metals!
  15. Another 2A3 build
  16. where r crossline master volumes from?
  17. Output Audio Transformer Impedance
  18. The echo effect of a headphone AMP
  19. flexy -a multirole driver/preamp-
  20. Scott 233 Bias procedure question
  21. What to do with 6DQ6B's?
  22. Goodcomponent - another chinese supplier
  23. Do EL34s in pentode mode PP AB1 sound better with lower screen voltage?
  24. Bogen MX60A as pre-amp
  25. kiwi.baby-huey. And so it begins...
  26. "sustain bias" and other organ amp ?s
  27. max current draw according to loadlines and reality
  28. Where to buy EI transformer bobbins?
  29. DHT filament circuit layouts ?
  30. After PP projects new SE project
  31. Gyrator Frequency Response?
  32. converting a dynaco mark IV driver board for headphone amp use
  33. Dared mp30
  34. PP pentode tube headphone amp PCB needed ( 6au6 thru el84)
  35. low wattage valve amps
  36. 6LU8 in Moscode 600
  37. The Octal Preamplifier with Phono section
  38. Which tube does my amp use? 12AU7 12BH7 12AX7 6CG7 others?
  39. Wacky Hum and Harmonics
  40. Constructions of ShuGang's 211 and 805A
  41. Tube ID help needed (EL34?)
  42. 5881, 6V6, EL84, or 7591 for triode-strapped operation?
  43. Strange Grounding Problem - My best guess: ghosts.
  44. High voltages
  45. PAC Perfectionist Audio Component preamp
  46. plate stoppers or cathode stoppers?
  47. Need Spud Amp schematic
  48. 5654 (6ak5) line stage in triode mode
  49. PSU capacitors
  50. Shuguang Treasure 300B-Z
  51. Rogers Cadet III input impedance
  52. Aikido w/ tone controls
  53. UTC Z-2961 input transformer
  54. Please help me improve my headphone amp
  55. Faint Hiss/Hum.
  56. What tubes with 3.3K p2p output?
  57. Strip board project completed.
  58. 6V6 SE VS ECL85
  59. 6v6 PP biasing question
  60. Phone Preamp PSU
  61. How much would a cathode follower drift ?
  62. Strange hum in a Williamson amp
  63. Tube preamp for a TDA2040 chipamp
  64. Heater problem
  65. A couple newbie questions
  66. 100KW Power Amplifier
  67. Excellent NOS Russian 6Pi3C/6N3C (6L6GC) Tubes...
  68. Flea-power class-A2 using a power opamp driver
  69. plate to plate feedback - measurements
  70. DC heat float with 50V bias tap from mains transformer?
  71. repair shop
  72. What to build next?
  73. Fisher X-100-C Output Transformer needed
  74. Schade Feedback
  75. RH807 push pull ?
  76. RIAA lite no.ls37
  77. help I need some addres tube store in amsterdam
  78. Valve curve tracer gm tester
  79. 50C5 pentode LTSpice model
  80. "Iron Garter" Push-Pull Amplifier
  81. Mcintosh Mc-3500 sound
  82. A couple of PSD questions
  83. parafeed - Gyrator vs CCS anode load
  84. Compactron amp... LIVES!
  85. Opinions Please
  86. Aikido REV D pcb
  87. New Edcor opt, what would a 150ohm primary be used for?
  88. GM-70, A2, biamping
  89. Espressivo Headphone Amplifier on Budget
  90. Coupling Caps for Aikido ACF Buffer
  91. How to compute current at control grid of power tube?
  92. High voltage SS output, any experiences ?
  93. Back on the forum after a long hiatus 6SN7 Preamp project in the works.
  94. Look for Single Tube scheme
  95. Cathode follower amplifier, push-pull, xformer-coupled
  96. help with "bruce heran" el84 amp S2
  97. Triodes and current flow
  98. Heaters Constant Current Regulator
  99. Driver Tubes: Help Me Decide
  100. Possible tweak
  101. DHT Driving Pentode Output Stage Question
  102. 50C5=50l6; 12av6=12at6
  103. Any experience to drive 805 tube?
  104. Fixed short in a 45
  105. power amp current
  106. Phase inverter/power section
  107. Concerned with current dual 5U4's...
  108. What tube is this?
  109. Signal tube noise!
  110. McIntosh Goodness From Scratch
  111. Marshall Amp strange wiring
  112. Fisher Output Transformer ID
  113. Stepped Attenuator for Air Tight ATC-1
  114. Caps .
  115. The Tube Killer Killer?
  116. Martel FAX-200C
  117. 6n6p headphone amp
  118. 2 caps vs 1 (adding low value teflon to pio)
  119. Ouput voltage of a triode stage on quiescent state should be zero?
  120. Hum Ho
  121. build a OTL (output-transformerless) amplifier
  122. 6v6 PP maggie with Polk SDA 1C
  123. Stromberg-Carlson AU-32 distortion in preamp
  124. Please Help - LF Peaks/Dips & Clipping
  125. Anybody watching this?
  126. Trying to find an unusual schematic posted here this Spring
  127. If you were going to build a OTL?
  128. Protecting a valve variable LM317 power supply
  129. EL34 PP PROJECT
  130. Matching tubes for PP
  131. Calculate triode strapped characteristics from pentode data?
  132. 6922 Loading Question
  133. corrections for LF and HF peaking
  134. 300bSE journey under way
  135. Why shielded tubes
  136. Aikido LV 6N27P SMPS completed
  137. Tube PS question: Acceptable ripple
  138. Back at the 45 SET
  139. Time to replace my 50 year old filter caps...
  140. Amazingly low distortion -- Radford-based design
  141. To ground or not to ground the OPT secondary, that is the question
  142. Ultralinear Observations and Questions
  143. FEEDBACK DELAY TIME
  144. 6SN7 v 6N8P v 6H8C
  145. NOS radio parts awaiting for my pick up!
  146. Toroidal Transformer Cover
  147. VTV 6sn7 line stage project
  148. can something be made using these tubes
  149. Help! Need tube tester info for 6CW4 Nuvistor
  150. Hampton MC preamp
  151. J-fet - tube DAC analog stage
  152. geloso 3270 power amplifier
  153. Belton micalex tube sockets any experience ?
  154. DeathTrap 500 - An Engineer's approach to the 300B SET
  155. My First Power Supply
  156. 5aR4 Rectifier Problem, Help! Little Long
  157. Electrolytic vs Polypropylene cathode
  158. Size of 5Y3 tubes?
  159. 3C24 really is a fine output tube...
  160. Yaqin MC100B Newbie Questions
  161. JE simple 45 SE grid leak resistor question
  162. 26 vs 27
  163. Bypass the tone control
  164. CCS with VN2222L
  165. Adding a ground with a 3 prong cable and connector
  166. European Made 6080/6AS7
  167. PFL200, what can I use them to?
  168. 7W7 tube - how it competes with other pentodes as driver?
  169. 1959 Blaupunkt receiver capacitors -Newbie
  170. i have one 5672 tube (new)
  171. 12ax7 pre amp + solid state power amp
  172. Preamp for Tim Mellow's 6C33C OTL
  173. Power supply buzz
  174. How to make a PCB with 15 years old Positiv 20
  175. Circuit query
  176. 845/211 driver circuits
  177. A question about the Malanz 7
  178. Looking for four KT90 Ei
  179. Dynaco PAS transformer breakdown
  180. where do you find your tube treasures
  181. 5670 Thoughts?
  182. looking to build or buy a cheep preamp
  183. Trying to achieve 25-30 watts... help please!
  184. RCA Reel to Reel Conversion??
  185. AA5 Tube Radio Design using 2010 Techniques
  186. I found a use for surplus tubes
  187. Edcor CXPP-30-MS-3.8K OPT
  188. Which tube does my amp use? 845 or 211
  189. Coupling cap replacement in series?
  190. electronique practique
  191. New PNP HV tranny for anode CCS
  192. tube reliability
  193. Hybrid dreams
  194. Triode Electronics 30W SE Transformer
  195. SMALL SIZE OUTPUT TRANSFORMERS
  196. headphone amp with 7025?
  197. Separation of preamp and power amp
  198. Aikido 9pin with 6n1p and 6n6p as Headphone
  199. PreAmp output transformers
  200. Line-out on tubes
  201. Would this scheme work ?
  202. differential cascode patented in 2007
  203. Question about AMP185 Rectifier Circuit
  204. correct heater wiring
  205. Speaker snap or crack (no pop)
  206. Very long cables
  207. Help! 2A3 SET quit after hot restart
  208. INTEGRATED HYBRID AMP WITH NO LOAD
  209. ECC88 symbol problem in TINA-TI
  210. 12AX7 preamp on 375V
  211. The Blue Velvet Line Preamp with 7193 instead of 6SN7
  212. Increase idle current on my KT77's?
  213. Yet another nutty idea - don't say I didn't warn
  214. Need help calibrating a Hickok 6000 Chicago
  215. need someone to run a sim in PSUD2...my PC is down and my MAC wont runt the program!!
  216. Building an B-15-inspired amp
  217. China preamp Xiang Sheng 768A
  218. RE: Fisher 200 tube amp fuse blowing issue
  219. How do you match output tubes?
  220. Best Dyna ST-70 rebuild kit?
  221. Help with tube wiring
  222. Decided on Gibson GA 20 need layout drawings etc.
  223. st70 problem
  224. Help with info on old valve amp
  225. Exceeding V-heater-cathode
  226. Cayin/Sparks A- 50T schematic.
  227. Looking for Bi siemens datasheet
  228. Transformers, transformers, transformers...
  229. Need ideas for my 6V6 from 1946 Blues / rockabilly
  230. Quasi complimentary output stage?
  231. 4ohm output transformer with 8ohm speaker
  232. First DIY project for a good power Amplifier
  233. Cherry red plates
  234. DIY triode
  235. First post/build
  236. New Transformer Vendor In Belgium
  237. KT88 grid stopper
  238. Connecting valve shields to earth
  239. Shindo MAZERIS BELLEVUS MODEL 454-2xAttenuator-How works this Circuit? 6067+12BH7
  240. Fixed bias failure B+ switch off protection
  241. Who can tell me where to buy Caddock MS220
  242. Uses for Quicksilver Transformers
  243. SE amp problem
  244. EL-34 to 6P3S-E
  245. 6922 sepp with Balanced Gains
  246. What path to choose for Hamonica amplifier?
  247. tubes for these OPT?, pri 1.75Kohm, sec 2.5, 4, 8ohm, taps 20%, weight 4Kg
  248. Turning a 6.3 V secondary into a 5 V secondary on an Antek 2T350
  249. gridchokes/output caps
  250. Can I build an MC30?

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