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  1. Odd amp built with PL81 / PL36
  2. Has anyone built a 47 SE amp?
  3. Which EL84
  4. First attempt p2p valve power amp
  5. Fundamental Pentode Question
  6. EL34 Triode Mode Resistors
  7. 807 SE Schematic Critiques
  8. Amp for Magneplanar 1.6
  9. After Christmas free time
  10. I suppose I am a little dense
  11. 12AU7 SE practise amp project
  12. LED bias with gNFB
  13. Schematic question - what this cap is for ?
  14. Output transformer
  15. 50C5s in PP ?
  16. input resistor on the JE LAB 300B
  17. Sockets for UY 41
  18. Any good tube amp kits for a first attempt?
  19. power supply suggestions and advice
  20. favourite midrange,treble tubes
  21. How can I turn 120VAC to 100VAC for Tango MS-UVD in an 845 SE amp?
  22. suspect a bad tube-any simple checks?
  23. Long-Tailed Pair, pse. share your views...
  24. 12AT7 vs 6SL7 as splitter for 6V6 ppp amp
  25. Ultralinear but no UL taps.
  26. OPT Question
  27. An Important Dumb Question-Newbie Stuff
  28. Switched to LED bias on 6SN7 cathode - how do I calculate current?
  29. Autobias OTL....Any thoughts?
  30. Valve Line Amp suggestions
  31. another 6c33 se
  32. no sound on the PHONO channel....
  33. What do you think of this cheap tube amplifier?
  34. Help! Want to Diy Tube Amp!
  35. Anyone care for some troubleshooting? Hum issue
  36. Re-tubing stock ST70
  37. your opinion of this bias problem
  38. paraphase with follower
  39. Noisy transformer
  40. 6BN11 in triode mode...any experience ?
  41. morgan jones:output stages
  42. Dynaco SCA-35 - fan Cooling?
  43. Partridge Vs Edcor
  44. Feedback with a choke ?
  45. Level matching?
  46. cascoded bjt ccs - design check please
  47. help on amp gain structure
  48. iPod/BlackBerry/MP3 input
  49. Shuguang 805 - Advice
  50. Mains Transformer Hums under load
  51. K12G left channel dead: HELP!
  52. Model 16LS Stereo Integrated Tube Amplifier
  53. Help identifying components
  54. Odd Block Series 1 6L6 Amp Power Supply
  55. Need Help for Improving HEATHKIT AA 151
  56. Troubleshooting help for a neophyte
  57. can cap - rectifier spacing
  58. tube dampers anyone
  59. cnc aluminium chassis for tube amps
  60. Balanced Input as Phase Inverter?
  61. 300B SET amp input sensitivity, Help.
  62. Any thoughts on this circuit?
  63. Will This Work? 26 Linestage
  64. Eico HF-89a question
  65. 100TH Ep-Ip Curve
  66. Power Transformer - Can you use separate tap for screens?
  67. Power supply for PP1C - sanity check
  68. Blue Velvet preamp
  69. Paid 5$ for this deluxe/vibrolux schematic! some connections missing help!!
  70. Universal Power Transformer
  71. Tone control in a TubelabSE?
  72. 300B Sweet Spot
  73. Does 81ma sound about right?
  74. Frank's EC8010/6C45P-GM70 SE Interstage.
  75. I need a bit of help to fine tune my PP EL84 amp
  76. IS there any OTL pre amps out there?
  77. 6BQ5 Sweet Spot?-Charts for other than 250 Screen Volts?
  78. Project Planning (Steps/Order)
  79. Question about coding on tube
  80. 6H13C OTL using 12 parallel tubes
  81. SE 2 watt clean amp?
  82. Transformers for tweeter amps on ferrite donuts
  83. Noob Help: Converting Thomas organ / Wiring
  84. Vintage power transformers
  85. 1625 pp amp layout - comments invited
  86. Grundig 3028 HELP
  87. Oscillation in hybrid amp, how to solve?
  88. Hipass filter to control master bias? - Why attempt to reproduce DC in a tube amp?
  89. Audio Note M-Zero remote control problem
  90. SE TESLA E34L
  91. Need help to restore Sansui 500A
  92. Push-Push OTL?
  93. Stereo Circlotron using only two supplies...
  94. Mercury 1000/2000 KT-88 and 6l6 design bug
  95. Has some tried to use E/PL81 in PPP setup
  96. Heatsinks for tubes?
  97. Mechanical Isolation for a Power Transformer
  98. My First Tube Amp Build: S5 K12G
  99. Size does matter!
  100. tubelabSE with 300b
  101. EL509 (JJ) or PL519?
  102. how can i build a Choke?
  103. A new design
  104. My first and last DIY tube amp !
  105. anyone help convert dual volume to single?
  106. 480-0-480vac To Power A SE GM70!??
  107. Triode plate resistance == internal negative feedback?
  108. Quiz: which tube is this?
  109. 6EM7 Headphone Spud - Please comment
  110. replacement tubes
  111. Mengyue Mini EL34B stereo balance issues..
  112. Email Address for Heiner Jakobi ?
  113. A quick tube matching question
  114. 30W triode?
  115. My Project: Pilot 602
  116. Fake glow LED under valve in commercial devices
  117. Unknown PP output transformers
  118. Switching Amp? 25watts WITH OUT tubes or Transistors?!?
  119. Power Supply B+ voltage?
  120. Newby here first post.
  121. Cheap and easy tube amp.
  122. Rate/critique my Dynaco A410 mods..
  123. Hammond 1650n and Dynaco mark III circuit.
  124. A quick safety question
  125. George RE: 26E6WG
  126. Advice for a beginner please..
  127. Balancing the PP cathode bias
  128. Hybrid Circlotron Amplifier with only 3 components on the signal path
  129. PARTRIGE transformer
  130. Western Electric 205D Tube for Preamp?
  131. Does anyone have the PDF for the Plitron 4142 ?
  132. 16sj8
  133. Restoring Baldwin 40 watt amps
  134. LTspice U/L Transformer Symbol
  135. advice please, a setup to characterise opts
  136. 809's in Class B P-P w/feedback
  137. Simple Audio Generator
  138. SE Amps with Variable Impedance Loads
  139. Linearity
  140. PSU Transformers for 6922 SRPP tube preamp
  141. 6JN8 curves?
  142. 6C6-2A3 Amplifier: Changes for 45?
  143. Which rectifier tubes are still manufactured?
  144. transconductance effect on peak power?
  145. Super cheap triode amplifier
  146. OTL designed by Glen Orr AudioXpress
  147. Heater voltages
  148. JC Morrison circuits
  149. Building Valve Amplifier from schematic
  150. CliffUSA VS Cliff UK
  151. Where are and how harmonics generated?
  152. resistors for LT317 heater circuit
  153. Function of R2
  154. balanced input for any amplifier
  155. Spect output peak to peak for 807 SE ul
  156. HK Citation II Output Transformer Data ???
  157. Looking to purchase non-working output transformers
  158. metals!
  159. Another 2A3 build
  160. where r crossline master volumes from?
  161. Output Audio Transformer Impedance
  162. The echo effect of a headphone AMP
  163. flexy -a multirole driver/preamp-
  164. Scott 233 Bias procedure question
  165. What to do with 6DQ6B's?
  166. Goodcomponent - another chinese supplier
  167. Do EL34s in pentode mode PP AB1 sound better with lower screen voltage?
  168. Bogen MX60A as pre-amp
  169. kiwi.baby-huey. And so it begins...
  170. "sustain bias" and other organ amp ?s
  171. max current draw according to loadlines and reality
  172. DHT filament circuit layouts ?
  173. After PP projects new SE project
  174. Gyrator Frequency Response?
  175. converting a dynaco mark IV driver board for headphone amp use
  176. Dared mp30
  177. PP pentode tube headphone amp PCB needed ( 6au6 thru el84)
  178. low wattage valve amps
  179. 6LU8 in Moscode 600
  180. The Octal Preamplifier with Phono section
  181. Which tube does my amp use? 12AU7 12BH7 12AX7 6CG7 others?
  182. Wacky Hum and Harmonics
  183. Constructions of ShuGang's 211 and 805A
  184. Tube ID help needed (EL34?)
  185. 5881, 6V6, EL84, or 7591 for triode-strapped operation?
  186. Strange Grounding Problem - My best guess: ghosts.
  187. High voltages
  188. PAC Perfectionist Audio Component preamp
  189. plate stoppers or cathode stoppers?
  190. Need Spud Amp schematic
  191. 5654 (6ak5) line stage in triode mode
  192. PSU capacitors
  193. Shuguang Treasure 300B-Z
  194. Rogers Cadet III input impedance
  195. Aikido w/ tone controls
  196. UTC Z-2961 input transformer
  197. Please help me improve my headphone amp
  198. Faint Hiss/Hum.
  199. What tubes with 3.3K p2p output?
  200. Strip board project completed.
  201. 6V6 SE VS ECL85
  202. 6v6 PP biasing question
  203. Phone Preamp PSU
  204. How much would a cathode follower drift ?
  205. Strange hum in a Williamson amp
  206. Tube preamp for a TDA2040 chipamp
  207. Heater problem
  208. A couple newbie questions
  209. 100KW Power Amplifier
  210. Excellent NOS Russian 6Pi3C/6N3C (6L6GC) Tubes...
  211. Flea-power class-A2 using a power opamp driver
  212. plate to plate feedback - measurements
  213. DC heat float with 50V bias tap from mains transformer?
  214. repair shop
  215. What to build next?
  216. Fisher X-100-C Output Transformer needed
  217. Schade Feedback
  218. RH807 push pull ?
  219. RIAA lite no.ls37
  220. help I need some addres tube store in amsterdam
  221. 50C5 pentode LTSpice model
  222. "Iron Garter" Push-Pull Amplifier
  223. Mcintosh Mc-3500 sound
  224. A couple of PSD questions
  225. parafeed - Gyrator vs CCS anode load
  226. Compactron amp... LIVES!
  227. Opinions Please
  228. Aikido REV D pcb
  229. New Edcor opt, what would a 150ohm primary be used for?
  230. GM-70, A2, biamping
  231. Espressivo Headphone Amplifier on Budget
  232. Coupling Caps for Aikido ACF Buffer
  233. How to compute current at control grid of power tube?
  234. High voltage SS output, any experiences ?
  235. Back on the forum after a long hiatus 6SN7 Preamp project in the works.
  236. Look for Single Tube scheme
  237. Cathode follower amplifier, push-pull, xformer-coupled
  238. help with "bruce heran" el84 amp S2
  239. Triodes and current flow
  240. Heaters Constant Current Regulator
  241. Driver Tubes: Help Me Decide
  242. Possible tweak
  243. DHT Driving Pentode Output Stage Question
  244. 50C5=50l6; 12av6=12at6
  245. Any experience to drive 805 tube?
  246. Fixed short in a 45
  247. power amp current
  248. Phase inverter/power section
  249. Concerned with current dual 5U4's...
  250. What tube is this?

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