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  1. Audio Note M-Zero remote control problem
  2. SE TESLA E34L
  3. Need help to restore Sansui 500A
  4. Push-Push OTL?
  5. Stereo Circlotron using only two supplies...
  6. Mercury 1000/2000 KT-88 and 6l6 design bug
  7. Has some tried to use E/PL81 in PPP setup
  8. Heatsinks for tubes?
  9. Mechanical Isolation for a Power Transformer
  10. My First Tube Amp Build: S5 K12G
  11. Size does matter!
  12. tubelabSE with 300b
  13. EL509 (JJ) or PL519?
  14. Clone of JTM45
  15. how can i build a Choke?
  16. A new design
  17. My first and last DIY tube amp !
  18. anyone help convert dual volume to single?
  19. 480-0-480vac To Power A SE GM70!??
  20. Triode plate resistance == internal negative feedback?
  21. Quiz: which tube is this?
  22. 6EM7 Headphone Spud - Please comment
  23. replacement tubes
  24. Mengyue Mini EL34B stereo balance issues..
  25. Email Address for Heiner Jakobi ?
  26. A quick tube matching question
  27. 30W triode?
  28. My Project: Pilot 602
  29. Fake glow LED under valve in commercial devices
  30. Unknown PP output transformers
  31. Switching Amp? 25watts WITH OUT tubes or Transistors?!?
  32. Power Supply B+ voltage?
  33. Newby here first post.
  34. Cheap and easy tube amp.
  35. Rate/critique my Dynaco A410 mods..
  36. Hammond 1650n and Dynaco mark III circuit.
  37. A quick safety question
  38. George RE: 26E6WG
  39. Advice for a beginner please..
  40. Balancing the PP cathode bias
  41. Hybrid Circlotron Amplifier with only 3 components on the signal path
  42. PARTRIGE transformer
  43. Western Electric 205D Tube for Preamp?
  44. Does anyone have the PDF for the Plitron 4142 ?
  45. 16sj8
  46. Mumbo-Jumbo and power supply caps
  47. Restoring Baldwin 40 watt amps
  48. LTspice U/L Transformer Symbol
  49. advice please, a setup to characterise opts
  50. 809's in Class B P-P w/feedback
  51. 5-pin plug needed
  52. Shorting Plugs
  53. Simple Audio Generator
  54. SE Amps with Variable Impedance Loads
  55. Linearity
  56. PSU Transformers for 6922 SRPP tube preamp
  57. 6JN8 curves?
  58. 6C6-2A3 Amplifier: Changes for 45?
  59. Which rectifier tubes are still manufactured?
  60. transconductance effect on peak power?
  61. Good Power Resistores ???
  62. Super cheap triode amplifier
  63. OTL designed by Glen Orr AudioXpress
  64. Heater voltages
  65. wire thickness
  66. JC Morrison circuits
  67. Building Valve Amplifier from schematic
  68. CliffUSA VS Cliff UK
  69. WHERE ARE;AND HOW ARE THE HARMONICS GENERATED?
  70. resistors for LT317 heater circuit
  71. Function of R2
  72. balanced input for any amplifier
  73. Spect output peak to peak for 807 SE ul
  74. HK Citation II Output Transformer Data ???
  75. Looking to purchase non-working output transformers
  76. metals!
  77. Another 2A3 build
  78. where r crossline master volumes from?
  79. Output Audio Transformer Impedance
  80. The echo effect of a headphone AMP
  81. flexy -a multirole driver/preamp-
  82. Scott 233 Bias procedure question
  83. What to do with 6DQ6B's?
  84. Goodcomponent - another chinese supplier
  85. Do EL34s in pentode mode PP AB1 sound better with lower screen voltage?
  86. Bogen MX60A as pre-amp
  87. kiwi.baby-huey. And so it begins...
  88. "sustain bias" and other organ amp ?s
  89. max current draw according to loadlines and reality
  90. Where to buy EI transformer bobbins?
  91. DHT filament circuit layouts ?
  92. After PP projects new SE project
  93. Gyrator Frequency Response?
  94. converting a dynaco mark IV driver board for headphone amp use
  95. Dared mp30
  96. PP pentode tube headphone amp PCB needed ( 6au6 thru el84)
  97. low wattage valve amps
  98. 6LU8 in Moscode 600
  99. The Octal Preamplifier with Phono section
  100. Which tube does my amp use? 12AU7 12BH7 12AX7 6CG7 others?
  101. Wacky Hum and Harmonics
  102. Constructions of ShuGang's 211 and 805A
  103. Tube ID help needed (EL34?)
  104. 5881, 6V6, EL84, or 7591 for triode-strapped operation?
  105. Strange Grounding Problem - My best guess: ghosts.
  106. High voltages
  107. PAC Perfectionist Audio Component preamp
  108. plate stoppers or cathode stoppers?
  109. Need Spud Amp schematic
  110. 5654 (6ak5) line stage in triode mode
  111. PSU capacitors
  112. Shuguang Treasure 300B-Z
  113. Rogers Cadet III input impedance
  114. Aikido w/ tone controls
  115. UTC Z-2961 input transformer
  116. Please help me improve my headphone amp
  117. Faint Hiss/Hum.
  118. What tubes with 3.3K p2p output?
  119. Strip board project completed.
  120. 6V6 SE VS ECL85
  121. 6v6 PP biasing question
  122. Phone Preamp PSU
  123. How much would a cathode follower drift ?
  124. Strange hum in a Williamson amp
  125. Tube preamp for a TDA2040 chipamp
  126. Heater problem
  127. A couple newbie questions
  128. 100KW Power Amplifier
  129. Excellent NOS Russian 6Pi3C/6N3C (6L6GC) Tubes...
  130. Flea-power class-A2 using a power opamp driver
  131. plate to plate feedback - measurements
  132. DC heat float with 50V bias tap from mains transformer?
  133. repair shop
  134. What to build next?
  135. Fisher X-100-C Output Transformer needed
  136. Schade Feedback
  137. RH807 push pull ?
  138. RIAA lite no.ls37
  139. help I need some addres tube store in amsterdam
  140. Valve curve tracer gm tester
  141. 50C5 pentode LTSpice model
  142. "Iron Garter" Push-Pull Amplifier
  143. Mcintosh Mc-3500 sound
  144. A couple of PSD questions
  145. parafeed - Gyrator vs CCS anode load
  146. Compactron amp... LIVES!
  147. Opinions Please
  148. Aikido REV D pcb
  149. New Edcor opt, what would a 150ohm primary be used for?
  150. GM-70, A2, biamping
  151. Espressivo Headphone Amplifier on Budget
  152. Coupling Caps for Aikido ACF Buffer
  153. How to compute current at control grid of power tube?
  154. High voltage SS output, any experiences ?
  155. Back on the forum after a long hiatus 6SN7 Preamp project in the works.
  156. Look for Single Tube scheme
  157. Cathode follower amplifier, push-pull, xformer-coupled
  158. help with "bruce heran" el84 amp S2
  159. Triodes and current flow
  160. Heaters Constant Current Regulator
  161. Driver Tubes: Help Me Decide
  162. Possible tweak
  163. DHT Driving Pentode Output Stage Question
  164. 50C5=50l6; 12av6=12at6
  165. Any experience to drive 805 tube?
  166. Fixed short in a 45
  167. power amp current
  168. Phase inverter/power section
  169. Concerned with current dual 5U4's...
  170. What tube is this?
  171. Signal tube noise!
  172. McIntosh Goodness From Scratch
  173. Fisher Output Transformer ID
  174. Stepped Attenuator for Air Tight ATC-1
  175. Caps .
  176. The Tube Killer Killer?
  177. Martel FAX-200C
  178. 6n6p headphone amp
  179. 2 caps vs 1 (adding low value teflon to pio)
  180. Ouput voltage of a triode stage on quiescent state should be zero?
  181. Hum Ho
  182. build a OTL (output-transformerless) amplifier
  183. 6v6 PP maggie with Polk SDA 1C
  184. Stromberg-Carlson AU-32 distortion in preamp
  185. Please Help - LF Peaks/Dips & Clipping
  186. Anybody watching this?
  187. Trying to find an unusual schematic posted here this Spring
  188. If you were going to build a OTL?
  189. Protecting a valve variable LM317 power supply
  190. EL34 PP PROJECT
  191. Matching tubes for PP
  192. Calculate triode strapped characteristics from pentode data?
  193. 6922 Loading Question
  194. corrections for LF and HF peaking
  195. 300bSE journey under way
  196. Why shielded tubes
  197. Aikido LV 6N27P SMPS completed
  198. Tube PS question: Acceptable ripple
  199. Back at the 45 SET
  200. Time to replace my 50 year old filter caps...
  201. Amazingly low distortion -- Radford-based design
  202. To ground or not to ground the OPT secondary, that is the question
  203. Ultralinear Observations and Questions
  204. FEEDBACK DELAY TIME
  205. 6SN7 v 6N8P v 6H8C
  206. NOS radio parts awaiting for my pick up!
  207. Toroidal Transformer Cover
  208. VTV 6sn7 line stage project
  209. can something be made using these tubes
  210. Help! Need tube tester info for 6CW4 Nuvistor
  211. Hampton MC preamp
  212. J-fet - tube DAC analog stage
  213. geloso 3270 power amplifier
  214. Belton micalex tube sockets any experience ?
  215. DeathTrap 500 - An Engineer's approach to the 300B SET
  216. My First Power Supply
  217. 5aR4 Rectifier Problem, Help! Little Long
  218. Electrolytic vs Polypropylene cathode
  219. Size of 5Y3 tubes?
  220. 3C24 really is a fine output tube...
  221. Yaqin MC100B Newbie Questions
  222. JE simple 45 SE grid leak resistor question
  223. 26 vs 27
  224. Bypass the tone control
  225. CCS with VN2222L
  226. Adding a ground with a 3 prong cable and connector
  227. European Made 6080/6AS7
  228. PFL200, what can I use them to?
  229. 7W7 tube - how it competes with other pentodes as driver?
  230. 1959 Blaupunkt receiver capacitors -Newbie
  231. i have one 5672 tube (new)
  232. 12ax7 pre amp + solid state power amp
  233. Preamp for Tim Mellow's 6C33C OTL
  234. Power supply buzz
  235. How to make a PCB with 15 years old Positiv 20
  236. Circuit query
  237. 845/211 driver circuits
  238. A question about the Malanz 7
  239. Looking for four KT90 Ei
  240. Dynaco PAS transformer breakdown
  241. where do you find your tube treasures
  242. 5670 Thoughts?
  243. looking to build or buy a cheep preamp
  244. Trying to achieve 25-30 watts... help please!
  245. RCA Reel to Reel Conversion??
  246. AA5 Tube Radio Design using 2010 Techniques
  247. I found a use for surplus tubes
  248. Edcor CXPP-30-MS-3.8K OPT
  249. Which tube does my amp use? 845 or 211
  250. Coupling cap replacement in series?

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