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  1. Espressivo Headphone Amplifier on Budget
  2. Coupling Caps for Aikido ACF Buffer
  3. How to compute current at control grid of power tube?
  4. High voltage SS output, any experiences ?
  5. Back on the forum after a long hiatus 6SN7 Preamp project in the works.
  6. Look for Single Tube scheme
  7. Cathode follower amplifier, push-pull, xformer-coupled
  8. help with "bruce heran" el84 amp S2
  9. Triodes and current flow
  10. Heaters Constant Current Regulator
  11. Driver Tubes: Help Me Decide
  12. Possible tweak
  13. DHT Driving Pentode Output Stage Question
  14. 50C5=50l6; 12av6=12at6
  15. Any experience to drive 805 tube?
  16. Fixed short in a 45
  17. power amp current
  18. Phase inverter/power section
  19. Concerned with current dual 5U4's...
  20. What tube is this?
  21. Signal tube noise!
  22. McIntosh Goodness From Scratch
  23. Marshall Amp strange wiring
  24. Fisher Output Transformer ID
  25. Stepped Attenuator for Air Tight ATC-1
  26. Caps .
  27. The Tube Killer Killer?
  28. Martel FAX-200C
  29. 6n6p headphone amp
  30. 2 caps vs 1 (adding low value teflon to pio)
  31. Ouput voltage of a triode stage on quiescent state should be zero?
  32. Hum Ho
  33. build a OTL (output-transformerless) amplifier
  34. 6v6 PP maggie with Polk SDA 1C
  35. Stromberg-Carlson AU-32 distortion in preamp
  36. Please Help - LF Peaks/Dips & Clipping
  37. Anybody watching this?
  38. Trying to find an unusual schematic posted here this Spring
  39. If you were going to build a OTL?
  40. Protecting a valve variable LM317 power supply
  41. EL34 PP PROJECT
  42. Matching tubes for PP
  43. Calculate triode strapped characteristics from pentode data?
  44. 6922 Loading Question
  45. corrections for LF and HF peaking
  46. 300bSE journey under way
  47. Why shielded tubes
  48. Aikido LV 6N27P SMPS completed
  49. Tube PS question: Acceptable ripple
  50. Back at the 45 SET
  51. Time to replace my 50 year old filter caps...
  52. Amazingly low distortion -- Radford-based design
  53. To ground or not to ground the OPT secondary, that is the question
  54. Ultralinear Observations and Questions
  55. FEEDBACK DELAY TIME
  56. 6SN7 v 6N8P v 6H8C
  57. NOS radio parts awaiting for my pick up!
  58. Toroidal Transformer Cover
  59. VTV 6sn7 line stage project
  60. can something be made using these tubes
  61. Help! Need tube tester info for 6CW4 Nuvistor
  62. Hampton MC preamp
  63. J-fet - tube DAC analog stage
  64. geloso 3270 power amplifier
  65. Belton micalex tube sockets any experience ?
  66. DeathTrap 500 - An Engineer's approach to the 300B SET
  67. My First Power Supply
  68. 5aR4 Rectifier Problem, Help! Little Long
  69. Electrolytic vs Polypropylene cathode
  70. Size of 5Y3 tubes?
  71. 3C24 really is a fine output tube...
  72. Yaqin MC100B Newbie Questions
  73. JE simple 45 SE grid leak resistor question
  74. 26 vs 27
  75. Bypass the tone control
  76. CCS with VN2222L
  77. Adding a ground with a 3 prong cable and connector
  78. European Made 6080/6AS7
  79. PFL200, what can I use them to?
  80. 7W7 tube - how it competes with other pentodes as driver?
  81. 1959 Blaupunkt receiver capacitors -Newbie
  82. i have one 5672 tube (new)
  83. 12ax7 pre amp + solid state power amp
  84. Preamp for Tim Mellow's 6C33C OTL
  85. Power supply buzz
  86. How to make a PCB with 15 years old Positiv 20
  87. Circuit query
  88. 845/211 driver circuits
  89. A question about the Malanz 7
  90. Looking for four KT90 Ei
  91. Dynaco PAS transformer breakdown
  92. where do you find your tube treasures
  93. 5670 Thoughts?
  94. looking to build or buy a cheep preamp
  95. Trying to achieve 25-30 watts... help please!
  96. RCA Reel to Reel Conversion??
  97. AA5 Tube Radio Design using 2010 Techniques
  98. I found a use for surplus tubes
  99. Edcor CXPP-30-MS-3.8K OPT
  100. Which tube does my amp use? 845 or 211
  101. Coupling cap replacement in series?
  102. electronique practique
  103. New PNP HV tranny for anode CCS
  104. tube reliability
  105. Hybrid dreams
  106. Triode Electronics 30W SE Transformer
  107. SMALL SIZE OUTPUT TRANSFORMERS
  108. headphone amp with 7025?
  109. Separation of preamp and power amp
  110. Aikido 9pin with 6n1p and 6n6p as Headphone
  111. PreAmp output transformers
  112. Line-out on tubes
  113. Would this scheme work ?
  114. differential cascode patented in 2007
  115. Question about AMP185 Rectifier Circuit
  116. correct heater wiring
  117. Speaker snap or crack (no pop)
  118. Very long cables
  119. Help! 2A3 SET quit after hot restart
  120. INTEGRATED HYBRID AMP WITH NO LOAD
  121. ECC88 symbol problem in TINA-TI
  122. 12AX7 preamp on 375V
  123. The Blue Velvet Line Preamp with 7193 instead of 6SN7
  124. Increase idle current on my KT77's?
  125. Yet another nutty idea - don't say I didn't warn
  126. Need help calibrating a Hickok 6000 Chicago
  127. need someone to run a sim in PSUD2...my PC is down and my MAC wont runt the program!!
  128. Building an B-15-inspired amp
  129. China preamp Xiang Sheng 768A
  130. RE: Fisher 200 tube amp fuse blowing issue
  131. How do you match output tubes?
  132. Best Dyna ST-70 rebuild kit?
  133. Help with tube wiring
  134. Decided on Gibson GA 20 need layout drawings etc.
  135. st70 problem
  136. Help with info on old valve amp
  137. Exceeding V-heater-cathode
  138. Cayin/Sparks A- 50T schematic.
  139. Looking for Bi siemens datasheet
  140. Transformers, transformers, transformers...
  141. Need ideas for my 6V6 from 1946 Blues / rockabilly
  142. Quasi complimentary output stage?
  143. 4ohm output transformer with 8ohm speaker
  144. First DIY project for a good power Amplifier
  145. Cherry red plates
  146. DIY triode
  147. First post/build
  148. New Transformer Vendor In Belgium
  149. KT88 grid stopper
  150. Connecting valve shields to earth
  151. Shindo MAZERIS BELLEVUS MODEL 454-2xAttenuator-How works this Circuit? 6067+12BH7
  152. Fixed bias failure B+ switch off protection
  153. Who can tell me where to buy Caddock MS220
  154. Uses for Quicksilver Transformers
  155. SE amp problem
  156. EL-34 to 6P3S-E
  157. 6922 sepp with Balanced Gains
  158. What path to choose for Hamonica amplifier?
  159. tubes for these OPT?, pri 1.75Kohm, sec 2.5, 4, 8ohm, taps 20%, weight 4Kg
  160. Turning a 6.3 V secondary into a 5 V secondary on an Antek 2T350
  161. gridchokes/output caps
  162. Can I build an MC30?
  163. Cathodyne: Can someone please help me fill in the blanks ?
  164. help hovland hp200
  165. 6SL7 and 6AS7 PP amplifier, design advice needed
  166. Project: Baldwin Tube Amp...
  167. Power Supply Input Capacitor - JE simple 45 question
  168. Tube output: Voltage or Current source?
  169. Edcor's new E-store website.....finally!
  170. Help complete the 300B schematic
  171. Confusion about a 5Y3GT rectifier
  172. Need advice on 300B circuit
  173. PCB in components
  174. new 6080 dc pp
  175. Single ended to balanced Aikido with mosfets in buffer position
  176. Simple LED power indicator light circuit?
  177. about 83 mercury rectifier
  178. Aikido Zo Calculation
  179. Line out issue - 1965 Ampeg B-18-N
  180. Pavane/ Psvane 845, 805, 211, 12AX7, 12AU7, 12AT7 and EL84
  181. Is this Telefunken fake or OEM?
  182. About Hmmmmm
  183. PRE-AMP PROJECT SRPP + HEADPHONE AMP
  184. 6BN11 vs 6CB6
  185. Is output stage local feedback necessary?
  186. Tube Longevity
  187. Power triode drive current requirements
  188. OPT Selection Question
  189. Recommend me a 6V6 P-P schematic
  190. Requesting advice on a pre-amp build. I'm working on asking realistic questions.
  191. So, im going to replace the Alps with a PEC...someone help?
  192. 13e1 se "shade" some questions
  193. Pio russian capacitor K42-11...is good ?
  194. My first build VTA ST-120
  195. World Wide Audio, model: HBP-97a, Hybrid Power Amplifier - info needed
  196. DIY 50C5 mini amp...
  197. So you think you have cool tubes?????
  198. Layout
  199. Looking to ID this amp
  200. Help me to make tube amply
  201. CAT SL1 SIGNATURE schematik phono
  202. Have anyone built this 6V6 amp?
  203. GU-50 in Single-Ended Triode Configuration - What bias points?
  204. DC coupling on a LTP? Opinions and help needed on Fred's design.
  205. Power Selection - Help Needed
  206. Which speaker with a 1/4W tube amp?
  207. 6973 VS 6CZ5 substitute
  208. Third Reich tubes
  209. Hello...and another ST-70 project.
  210. Home theater magic smoke...smoked and I think I heard a mirror crack...
  211. Scott LK48-B restoration
  212. 3 - 12AU7 Preamp. Is there such an animal?
  213. 300b filament
  214. resistor 880 ohms cathode
  215. Anyone have a Bugle Boy logo
  216. Change of circuit from triode to tetrode
  217. Need upgrade info for my Atma-Sphere Novacron Amps
  218. Whats Vintage Testing Equipment Do YOU Have/Use?
  219. JJ Kt77 Bias?
  220. tube rectified psu
  221. HELP!: my SET amp was turned off without a load and now it sound veiled!
  222. 5842 grid leak
  223. AMI Jukebox speaker impedence question
  224. Advice Needed: "Flabby" Amp Low-End
  225. Aikido transformer coupled output
  226. Audio measurements on tube amp. ? look here
  227. 12BH7A driver stage help
  228. Audio drive to g2 connected to g1 via 15K0
  229. KT88 SE Complete Kit
  230. Any high-end 6BM8 push pull tube amp schematic ?
  231. How a Triode Works
  232. EL3N substitute
  233. Magnavox AMP-185
  234. Best 6V6G that won't get me divorced..
  235. Shorted EL34 ?
  236. ARC VS60 hum in speaker
  237. Need help for a bias circuit
  238. Eico HF20 Output Txr Questions
  239. A Radford STA15 restoration story
  240. Tube Testing in DC Area
  241. Thorens PR24
  242. Newbie here with a couple questions
  243. 300B SwitchMode filament supply
  244. Mixed bias for balancing unmatched tubes in PPP?
  245. My First DIY Experience: An Aikido/Tetra Preamp
  246. how to test chokes for current and voltage
  247. pictures miniblok 1 and miniblok 2 by fred nachbaur
  248. Help with Aikido Preamp+class d amp
  249. will a PTX without center tap work?
  250. Anyone have information on 300B silvertone tube

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