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  1. OPT Question
  2. An Important Dumb Question-Newbie Stuff
  3. Switched to LED bias on 6SN7 cathode - how do I calculate current?
  4. Autobias OTL....Any thoughts?
  5. Valve Line Amp suggestions
  6. another 6c33 se
  7. no sound on the PHONO channel....
  8. What do you think of this cheap tube amplifier?
  9. What guitar amp should I build from these?
  10. EL34 Hickok 439B setup
  11. Hickok 605
  12. Help! Want to Diy Tube Amp!
  13. Anyone care for some troubleshooting? Hum issue
  14. Re-tubing stock ST70
  15. your opinion of this bias problem
  16. paraphase with follower
  17. Noisy transformer
  18. 6BN11 in triode mode...any experience ?
  19. morgan jones:output stages
  20. Dynaco SCA-35 - fan Cooling?
  21. Partridge Vs Edcor
  22. Feedback with a choke ?
  23. Do you have a tube tester?
  24. Level matching?
  25. cascoded bjt ccs - design check please
  26. Hammond Organ amp to guitar amp
  27. Square wave testing......a guitar amp
  28. help on amp gain structure
  29. iPod/BlackBerry/MP3 input
  30. Shuguang 805 - Advice
  31. Mains Transformer Hums under load
  32. Film Caps in Tube Amps
  33. K12G left channel dead: HELP!
  34. Model 16LS Stereo Integrated Tube Amplifier
  35. Help identifying components
  36. Odd Block Series 1 6L6 Amp Power Supply
  37. Mesa/Boogie Bass 400+ mod question
  38. Need Help for Improving HEATHKIT AA 151
  39. Troubleshooting help for a neophyte
  40. can cap - rectifier spacing
  41. tube dampers anyone
  42. cnc aluminium chassis for tube amps
  43. Balanced Input as Phase Inverter?
  44. 300B SET amp input sensitivity, Help.
  45. Any thoughts on this circuit?
  46. Will This Work? 26 Linestage
  47. Eico HF-89a question
  48. 100TH Ep-Ip Curve
  49. Power Transformer - Can you use separate tap for screens?
  50. Power supply for PP1C - sanity check
  51. Blue Velvet preamp
  52. Paid 5$ for this deluxe/vibrolux schematic! some connections missing help!!
  53. Universal Power Transformer
  54. Tone control in a TubelabSE?
  55. 300B Sweet Spot
  56. Does 81ma sound about right?
  57. Frank's EC8010/6C45P-GM70 SE Interstage.
  58. I need a bit of help to fine tune my PP EL84 amp
  59. IS there any OTL pre amps out there?
  60. Rubycon oil caps
  61. 6BQ5 Sweet Spot?-Charts for other than 250 Screen Volts?
  62. Project Planning (Steps/Order)
  63. Question about coding on tube
  64. 6H13C OTL using 12 parallel tubes
  65. SE 2 watt clean amp?
  66. Transformers for tweeter amps on ferrite donuts
  67. Noob Help: Converting Thomas organ / Wiring
  68. Vintage power transformers
  69. 1625 pp amp layout - comments invited
  70. Grundig 3028 HELP
  71. Oscillation in hybrid amp, how to solve?
  72. Hipass filter to control master bias? - Why attempt to reproduce DC in a tube amp?
  73. Audio Note M-Zero remote control problem
  74. SE TESLA E34L
  75. Need help to restore Sansui 500A
  76. Push-Push OTL?
  77. Stereo Circlotron using only two supplies...
  78. Mercury 1000/2000 KT-88 and 6l6 design bug
  79. Has some tried to use E/PL81 in PPP setup
  80. Heatsinks for tubes?
  81. Mechanical Isolation for a Power Transformer
  82. My First Tube Amp Build: S5 K12G
  83. Size does matter!
  84. tubelabSE with 300b
  85. EL509 (JJ) or PL519?
  86. Clone of JTM45
  87. how can i build a Choke?
  88. A new design
  89. My first and last DIY tube amp !
  90. anyone help convert dual volume to single?
  91. 480-0-480vac To Power A SE GM70!??
  92. Triode plate resistance == internal negative feedback?
  93. Quiz: which tube is this?
  94. 6EM7 Headphone Spud - Please comment
  95. replacement tubes
  96. Mengyue Mini EL34B stereo balance issues..
  97. Email Address for Heiner Jakobi ?
  98. A quick tube matching question
  99. 30W triode?
  100. My Project: Pilot 602
  101. Fake glow LED under valve in commercial devices
  102. Unknown PP output transformers
  103. Switching Amp? 25watts WITH OUT tubes or Transistors?!?
  104. Power Supply B+ voltage?
  105. Newby here first post.
  106. Cheap and easy tube amp.
  107. Rate/critique my Dynaco A410 mods..
  108. Hammond 1650n and Dynaco mark III circuit.
  109. A quick safety question
  110. George RE: 26E6WG
  111. Advice for a beginner please..
  112. Balancing the PP cathode bias
  113. Hybrid Circlotron Amplifier with only 3 components on the signal path
  114. PARTRIGE transformer
  115. Western Electric 205D Tube for Preamp?
  116. Does anyone have the PDF for the Plitron 4142 ?
  117. 16sj8
  118. Mumbo-Jumbo and power supply caps
  119. Restoring Baldwin 40 watt amps
  120. LTspice U/L Transformer Symbol
  121. advice please, a setup to characterise opts
  122. 809's in Class B P-P w/feedback
  123. 5-pin plug needed
  124. Shorting Plugs
  125. Simple Audio Generator
  126. SE Amps with Variable Impedance Loads
  127. Linearity
  128. PSU Transformers for 6922 SRPP tube preamp
  129. 6JN8 curves?
  130. 6C6-2A3 Amplifier: Changes for 45?
  131. Which rectifier tubes are still manufactured?
  132. transconductance effect on peak power?
  133. Good Power Resistores ???
  134. Super cheap triode amplifier
  135. OTL designed by Glen Orr AudioXpress
  136. Heater voltages
  137. wire thickness
  138. JC Morrison circuits
  139. Building Valve Amplifier from schematic
  140. CliffUSA VS Cliff UK
  141. WHERE ARE;AND HOW ARE THE HARMONICS GENERATED?
  142. resistors for LT317 heater circuit
  143. Function of R2
  144. balanced input for any amplifier
  145. Spect output peak to peak for 807 SE ul
  146. HK Citation II Output Transformer Data ???
  147. Looking to purchase non-working output transformers
  148. metals!
  149. Another 2A3 build
  150. where r crossline master volumes from?
  151. Output Audio Transformer Impedance
  152. The echo effect of a headphone AMP
  153. flexy -a multirole driver/preamp-
  154. Scott 233 Bias procedure question
  155. What to do with 6DQ6B's?
  156. Goodcomponent - another chinese supplier
  157. Do EL34s in pentode mode PP AB1 sound better with lower screen voltage?
  158. Bogen MX60A as pre-amp
  159. kiwi.baby-huey. And so it begins...
  160. "sustain bias" and other organ amp ?s
  161. max current draw according to loadlines and reality
  162. Where to buy EI transformer bobbins?
  163. DHT filament circuit layouts ?
  164. After PP projects new SE project
  165. Gyrator Frequency Response?
  166. converting a dynaco mark IV driver board for headphone amp use
  167. Dared mp30
  168. PP pentode tube headphone amp PCB needed ( 6au6 thru el84)
  169. low wattage valve amps
  170. 6LU8 in Moscode 600
  171. The Octal Preamplifier with Phono section
  172. Which tube does my amp use? 12AU7 12BH7 12AX7 6CG7 others?
  173. Wacky Hum and Harmonics
  174. Constructions of ShuGang's 211 and 805A
  175. Tube ID help needed (EL34?)
  176. 5881, 6V6, EL84, or 7591 for triode-strapped operation?
  177. Strange Grounding Problem - My best guess: ghosts.
  178. High voltages
  179. PAC Perfectionist Audio Component preamp
  180. plate stoppers or cathode stoppers?
  181. Need Spud Amp schematic
  182. 5654 (6ak5) line stage in triode mode
  183. PSU capacitors
  184. Shuguang Treasure 300B-Z
  185. Rogers Cadet III input impedance
  186. Aikido w/ tone controls
  187. UTC Z-2961 input transformer
  188. Please help me improve my headphone amp
  189. Faint Hiss/Hum.
  190. What tubes with 3.3K p2p output?
  191. Strip board project completed.
  192. 6V6 SE VS ECL85
  193. 6v6 PP biasing question
  194. Phone Preamp PSU
  195. How much would a cathode follower drift ?
  196. Strange hum in a Williamson amp
  197. Tube preamp for a TDA2040 chipamp
  198. Heater problem
  199. A couple newbie questions
  200. 100KW Power Amplifier
  201. Excellent NOS Russian 6Pi3C/6N3C (6L6GC) Tubes...
  202. Flea-power class-A2 using a power opamp driver
  203. plate to plate feedback - measurements
  204. DC heat float with 50V bias tap from mains transformer?
  205. repair shop
  206. What to build next?
  207. Fisher X-100-C Output Transformer needed
  208. Schade Feedback
  209. RH807 push pull ?
  210. RIAA lite no.ls37
  211. help I need some addres tube store in amsterdam
  212. Valve curve tracer gm tester
  213. 50C5 pentode LTSpice model
  214. "Iron Garter" Push-Pull Amplifier
  215. Mcintosh Mc-3500 sound
  216. A couple of PSD questions
  217. parafeed - Gyrator vs CCS anode load
  218. Compactron amp... LIVES!
  219. Opinions Please
  220. Aikido REV D pcb
  221. New Edcor opt, what would a 150ohm primary be used for?
  222. GM-70, A2, biamping
  223. Espressivo Headphone Amplifier on Budget
  224. Coupling Caps for Aikido ACF Buffer
  225. How to compute current at control grid of power tube?
  226. High voltage SS output, any experiences ?
  227. Back on the forum after a long hiatus 6SN7 Preamp project in the works.
  228. Look for Single Tube scheme
  229. Cathode follower amplifier, push-pull, xformer-coupled
  230. help with "bruce heran" el84 amp S2
  231. Triodes and current flow
  232. Heaters Constant Current Regulator
  233. Driver Tubes: Help Me Decide
  234. Possible tweak
  235. DHT Driving Pentode Output Stage Question
  236. 50C5=50l6; 12av6=12at6
  237. Any experience to drive 805 tube?
  238. Fixed short in a 45
  239. power amp current
  240. Phase inverter/power section
  241. Concerned with current dual 5U4's...
  242. What tube is this?
  243. Signal tube noise!
  244. McIntosh Goodness From Scratch
  245. Marshall Amp strange wiring
  246. Fisher Output Transformer ID
  247. Stepped Attenuator for Air Tight ATC-1
  248. Caps .
  249. The Tube Killer Killer?
  250. Martel FAX-200C

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