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  1. Feedback with a choke ?
  2. Do you have a tube tester?
  3. Level matching?
  4. cascoded bjt ccs - design check please
  5. Hammond Organ amp to guitar amp
  6. Square wave testing......a guitar amp
  7. help on amp gain structure
  8. iPod/BlackBerry/MP3 input
  9. Shuguang 805 - Advice
  10. Mains Transformer Hums under load
  11. Film Caps in Tube Amps
  12. K12G left channel dead: HELP!
  13. Model 16LS Stereo Integrated Tube Amplifier
  14. Help identifying components
  15. Odd Block Series 1 6L6 Amp Power Supply
  16. Mesa/Boogie Bass 400+ mod question
  17. Need Help for Improving HEATHKIT AA 151
  18. Troubleshooting help for a neophyte
  19. can cap - rectifier spacing
  20. tube dampers anyone
  21. cnc aluminium chassis for tube amps
  22. Balanced Input as Phase Inverter?
  23. 300B SET amp input sensitivity, Help.
  24. Any thoughts on this circuit?
  25. Will This Work? 26 Linestage
  26. Eico HF-89a question
  27. 100TH Ep-Ip Curve
  28. Power Transformer - Can you use separate tap for screens?
  29. Power supply for PP1C - sanity check
  30. Blue Velvet preamp
  31. Paid 5$ for this deluxe/vibrolux schematic! some connections missing help!!
  32. Universal Power Transformer
  33. Tone control in a TubelabSE?
  34. 300B Sweet Spot
  35. Does 81ma sound about right?
  36. Frank's EC8010/6C45P-GM70 SE Interstage.
  37. I need a bit of help to fine tune my PP EL84 amp
  38. IS there any OTL pre amps out there?
  39. Rubycon oil caps
  40. 6BQ5 Sweet Spot?-Charts for other than 250 Screen Volts?
  41. Project Planning (Steps/Order)
  42. Question about coding on tube
  43. 6H13C OTL using 12 parallel tubes
  44. SE 2 watt clean amp?
  45. Transformers for tweeter amps on ferrite donuts
  46. Noob Help: Converting Thomas organ / Wiring
  47. Vintage power transformers
  48. 1625 pp amp layout - comments invited
  49. Grundig 3028 HELP
  50. Oscillation in hybrid amp, how to solve?
  51. Hipass filter to control master bias? - Why attempt to reproduce DC in a tube amp?
  52. Audio Note M-Zero remote control problem
  53. SE TESLA E34L
  54. Need help to restore Sansui 500A
  55. Push-Push OTL?
  56. Stereo Circlotron using only two supplies...
  57. Mercury 1000/2000 KT-88 and 6l6 design bug
  58. Has some tried to use E/PL81 in PPP setup
  59. Heatsinks for tubes?
  60. Mechanical Isolation for a Power Transformer
  61. My First Tube Amp Build: S5 K12G
  62. Size does matter!
  63. tubelabSE with 300b
  64. EL509 (JJ) or PL519?
  65. Clone of JTM45
  66. how can i build a Choke?
  67. A new design
  68. My first and last DIY tube amp !
  69. anyone help convert dual volume to single?
  70. 480-0-480vac To Power A SE GM70!??
  71. Triode plate resistance == internal negative feedback?
  72. Quiz: which tube is this?
  73. 6EM7 Headphone Spud - Please comment
  74. replacement tubes
  75. Mengyue Mini EL34B stereo balance issues..
  76. Email Address for Heiner Jakobi ?
  77. A quick tube matching question
  78. 30W triode?
  79. My Project: Pilot 602
  80. Fake glow LED under valve in commercial devices
  81. Unknown PP output transformers
  82. Switching Amp? 25watts WITH OUT tubes or Transistors?!?
  83. Power Supply B+ voltage?
  84. Newby here first post.
  85. Cheap and easy tube amp.
  86. Rate/critique my Dynaco A410 mods..
  87. Hammond 1650n and Dynaco mark III circuit.
  88. A quick safety question
  89. George RE: 26E6WG
  90. Advice for a beginner please..
  91. Balancing the PP cathode bias
  92. Hybrid Circlotron Amplifier with only 3 components on the signal path
  93. PARTRIGE transformer
  94. Western Electric 205D Tube for Preamp?
  95. Does anyone have the PDF for the Plitron 4142 ?
  96. 16sj8
  97. Mumbo-Jumbo and power supply caps
  98. Restoring Baldwin 40 watt amps
  99. LTspice U/L Transformer Symbol
  100. advice please, a setup to characterise opts
  101. 809's in Class B P-P w/feedback
  102. 5-pin plug needed
  103. Shorting Plugs
  104. Simple Audio Generator
  105. SE Amps with Variable Impedance Loads
  106. Linearity
  107. PSU Transformers for 6922 SRPP tube preamp
  108. 6JN8 curves?
  109. 6C6-2A3 Amplifier: Changes for 45?
  110. Which rectifier tubes are still manufactured?
  111. transconductance effect on peak power?
  112. Good Power Resistores ???
  113. Super cheap triode amplifier
  114. OTL designed by Glen Orr AudioXpress
  115. Heater voltages
  116. wire thickness
  117. JC Morrison circuits
  118. Building Valve Amplifier from schematic
  119. CliffUSA VS Cliff UK
  120. WHERE ARE;AND HOW ARE THE HARMONICS GENERATED?
  121. resistors for LT317 heater circuit
  122. Function of R2
  123. balanced input for any amplifier
  124. Spect output peak to peak for 807 SE ul
  125. HK Citation II Output Transformer Data ???
  126. Looking to purchase non-working output transformers
  127. metals!
  128. Another 2A3 build
  129. where r crossline master volumes from?
  130. Output Audio Transformer Impedance
  131. The echo effect of a headphone AMP
  132. flexy -a multirole driver/preamp-
  133. Scott 233 Bias procedure question
  134. What to do with 6DQ6B's?
  135. Goodcomponent - another chinese supplier
  136. Do EL34s in pentode mode PP AB1 sound better with lower screen voltage?
  137. Bogen MX60A as pre-amp
  138. kiwi.baby-huey. And so it begins...
  139. "sustain bias" and other organ amp ?s
  140. max current draw according to loadlines and reality
  141. Where to buy EI transformer bobbins?
  142. DHT filament circuit layouts ?
  143. After PP projects new SE project
  144. Gyrator Frequency Response?
  145. converting a dynaco mark IV driver board for headphone amp use
  146. Dared mp30
  147. PP pentode tube headphone amp PCB needed ( 6au6 thru el84)
  148. low wattage valve amps
  149. 6LU8 in Moscode 600
  150. The Octal Preamplifier with Phono section
  151. Which tube does my amp use? 12AU7 12BH7 12AX7 6CG7 others?
  152. Wacky Hum and Harmonics
  153. Constructions of ShuGang's 211 and 805A
  154. Tube ID help needed (EL34?)
  155. 5881, 6V6, EL84, or 7591 for triode-strapped operation?
  156. Strange Grounding Problem - My best guess: ghosts.
  157. High voltages
  158. PAC Perfectionist Audio Component preamp
  159. plate stoppers or cathode stoppers?
  160. Need Spud Amp schematic
  161. 5654 (6ak5) line stage in triode mode
  162. PSU capacitors
  163. Shuguang Treasure 300B-Z
  164. Rogers Cadet III input impedance
  165. Aikido w/ tone controls
  166. UTC Z-2961 input transformer
  167. Please help me improve my headphone amp
  168. Faint Hiss/Hum.
  169. What tubes with 3.3K p2p output?
  170. Strip board project completed.
  171. 6V6 SE VS ECL85
  172. 6v6 PP biasing question
  173. Phone Preamp PSU
  174. How much would a cathode follower drift ?
  175. Strange hum in a Williamson amp
  176. Tube preamp for a TDA2040 chipamp
  177. Heater problem
  178. A couple newbie questions
  179. 100KW Power Amplifier
  180. Excellent NOS Russian 6Pi3C/6N3C (6L6GC) Tubes...
  181. Flea-power class-A2 using a power opamp driver
  182. plate to plate feedback - measurements
  183. DC heat float with 50V bias tap from mains transformer?
  184. repair shop
  185. What to build next?
  186. Fisher X-100-C Output Transformer needed
  187. Schade Feedback
  188. RH807 push pull ?
  189. RIAA lite no.ls37
  190. help I need some addres tube store in amsterdam
  191. Valve curve tracer gm tester
  192. 50C5 pentode LTSpice model
  193. "Iron Garter" Push-Pull Amplifier
  194. Mcintosh Mc-3500 sound
  195. A couple of PSD questions
  196. parafeed - Gyrator vs CCS anode load
  197. Compactron amp... LIVES!
  198. Opinions Please
  199. Aikido REV D pcb
  200. New Edcor opt, what would a 150ohm primary be used for?
  201. GM-70, A2, biamping
  202. Espressivo Headphone Amplifier on Budget
  203. Coupling Caps for Aikido ACF Buffer
  204. How to compute current at control grid of power tube?
  205. High voltage SS output, any experiences ?
  206. Back on the forum after a long hiatus 6SN7 Preamp project in the works.
  207. Look for Single Tube scheme
  208. Cathode follower amplifier, push-pull, xformer-coupled
  209. help with "bruce heran" el84 amp S2
  210. Triodes and current flow
  211. Heaters Constant Current Regulator
  212. Driver Tubes: Help Me Decide
  213. Possible tweak
  214. DHT Driving Pentode Output Stage Question
  215. 50C5=50l6; 12av6=12at6
  216. Any experience to drive 805 tube?
  217. Fixed short in a 45
  218. power amp current
  219. Phase inverter/power section
  220. Concerned with current dual 5U4's...
  221. What tube is this?
  222. Signal tube noise!
  223. McIntosh Goodness From Scratch
  224. Marshall Amp strange wiring
  225. Fisher Output Transformer ID
  226. Stepped Attenuator for Air Tight ATC-1
  227. Caps .
  228. The Tube Killer Killer?
  229. Martel FAX-200C
  230. 6n6p headphone amp
  231. 2 caps vs 1 (adding low value teflon to pio)
  232. Ouput voltage of a triode stage on quiescent state should be zero?
  233. Hum Ho
  234. build a OTL (output-transformerless) amplifier
  235. 6v6 PP maggie with Polk SDA 1C
  236. Stromberg-Carlson AU-32 distortion in preamp
  237. Please Help - LF Peaks/Dips & Clipping
  238. Anybody watching this?
  239. Trying to find an unusual schematic posted here this Spring
  240. If you were going to build a OTL?
  241. Protecting a valve variable LM317 power supply
  242. EL34 PP PROJECT
  243. Matching tubes for PP
  244. Calculate triode strapped characteristics from pentode data?
  245. 6922 Loading Question
  246. corrections for LF and HF peaking
  247. 300bSE journey under way
  248. Why shielded tubes
  249. Aikido LV 6N27P SMPS completed
  250. Tube PS question: Acceptable ripple

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