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  1. Trying to find an unusual schematic posted here this Spring
  2. If you were going to build a OTL?
  3. Protecting a valve variable LM317 power supply
  4. EL34 PP PROJECT
  5. Matching tubes for PP
  6. Calculate triode strapped characteristics from pentode data?
  7. 6922 Loading Question
  8. corrections for LF and HF peaking
  9. 300bSE journey under way
  10. Why shielded tubes
  11. Aikido LV 6N27P SMPS completed
  12. Tube PS question: Acceptable ripple
  13. Back at the 45 SET
  14. Time to replace my 50 year old filter caps...
  15. Amazingly low distortion -- Radford-based design
  16. To ground or not to ground the OPT secondary, that is the question
  17. Ultralinear Observations and Questions
  18. FEEDBACK DELAY TIME
  19. 6SN7 v 6N8P v 6H8C
  20. NOS radio parts awaiting for my pick up!
  21. Toroidal Transformer Cover
  22. VTV 6sn7 line stage project
  23. can something be made using these tubes
  24. Help! Need tube tester info for 6CW4 Nuvistor
  25. Hampton MC preamp
  26. J-fet - tube DAC analog stage
  27. geloso 3270 power amplifier
  28. Belton micalex tube sockets any experience ?
  29. DeathTrap 500 - An Engineer's approach to the 300B SET
  30. My First Power Supply
  31. 5aR4 Rectifier Problem, Help! Little Long
  32. Electrolytic vs Polypropylene cathode
  33. Size of 5Y3 tubes?
  34. 3C24 really is a fine output tube...
  35. Yaqin MC100B Newbie Questions
  36. JE simple 45 SE grid leak resistor question
  37. 26 vs 27
  38. Bypass the tone control
  39. CCS with VN2222L
  40. Adding a ground with a 3 prong cable and connector
  41. European Made 6080/6AS7
  42. PFL200, what can I use them to?
  43. 7W7 tube - how it competes with other pentodes as driver?
  44. 1959 Blaupunkt receiver capacitors -Newbie
  45. i have one 5672 tube (new)
  46. 12ax7 pre amp + solid state power amp
  47. Preamp for Tim Mellow's 6C33C OTL
  48. Power supply buzz
  49. How to make a PCB with 15 years old Positiv 20
  50. Circuit query
  51. 845/211 driver circuits
  52. A question about the Malanz 7
  53. Looking for four KT90 Ei
  54. Dynaco PAS transformer breakdown
  55. where do you find your tube treasures
  56. 5670 Thoughts?
  57. looking to build or buy a cheep preamp
  58. Trying to achieve 25-30 watts... help please!
  59. RCA Reel to Reel Conversion??
  60. AA5 Tube Radio Design using 2010 Techniques
  61. I found a use for surplus tubes
  62. Edcor CXPP-30-MS-3.8K OPT
  63. Which tube does my amp use? 845 or 211
  64. Coupling cap replacement in series?
  65. electronique practique
  66. New PNP HV tranny for anode CCS
  67. tube reliability
  68. Hybrid dreams
  69. Triode Electronics 30W SE Transformer
  70. SMALL SIZE OUTPUT TRANSFORMERS
  71. headphone amp with 7025?
  72. Separation of preamp and power amp
  73. Aikido 9pin with 6n1p and 6n6p as Headphone
  74. PreAmp output transformers
  75. Line-out on tubes
  76. Would this scheme work ?
  77. differential cascode patented in 2007
  78. Question about AMP185 Rectifier Circuit
  79. correct heater wiring
  80. Speaker snap or crack (no pop)
  81. Very long cables
  82. Help! 2A3 SET quit after hot restart
  83. INTEGRATED HYBRID AMP WITH NO LOAD
  84. ECC88 symbol problem in TINA-TI
  85. 12AX7 preamp on 375V
  86. The Blue Velvet Line Preamp with 7193 instead of 6SN7
  87. Increase idle current on my KT77's?
  88. Yet another nutty idea - don't say I didn't warn
  89. Need help calibrating a Hickok 6000 Chicago
  90. need someone to run a sim in PSUD2...my PC is down and my MAC wont runt the program!!
  91. Building an B-15-inspired amp
  92. China preamp Xiang Sheng 768A
  93. RE: Fisher 200 tube amp fuse blowing issue
  94. How do you match output tubes?
  95. Best Dyna ST-70 rebuild kit?
  96. Help with tube wiring
  97. Decided on Gibson GA 20 need layout drawings etc.
  98. st70 problem
  99. Help with info on old valve amp
  100. Exceeding V-heater-cathode
  101. Cayin/Sparks A- 50T schematic.
  102. Looking for Bi siemens datasheet
  103. Transformers, transformers, transformers...
  104. Need ideas for my 6V6 from 1946 Blues / rockabilly
  105. Quasi complimentary output stage?
  106. 4ohm output transformer with 8ohm speaker
  107. First DIY project for a good power Amplifier
  108. Cherry red plates
  109. DIY triode
  110. First post/build
  111. New Transformer Vendor In Belgium
  112. KT88 grid stopper
  113. Connecting valve shields to earth
  114. Shindo MAZERIS BELLEVUS MODEL 454-2xAttenuator-How works this Circuit? 6067+12BH7
  115. Fixed bias failure B+ switch off protection
  116. Who can tell me where to buy Caddock MS220
  117. Uses for Quicksilver Transformers
  118. SE amp problem
  119. EL-34 to 6P3S-E
  120. 6922 sepp with Balanced Gains
  121. What path to choose for Hamonica amplifier?
  122. tubes for these OPT?, pri 1.75Kohm, sec 2.5, 4, 8ohm, taps 20%, weight 4Kg
  123. Turning a 6.3 V secondary into a 5 V secondary on an Antek 2T350
  124. gridchokes/output caps
  125. Can I build an MC30?
  126. Cathodyne: Can someone please help me fill in the blanks ?
  127. help hovland hp200
  128. 6SL7 and 6AS7 PP amplifier, design advice needed
  129. Project: Baldwin Tube Amp...
  130. Power Supply Input Capacitor - JE simple 45 question
  131. Tube output: Voltage or Current source?
  132. Edcor's new E-store website.....finally!
  133. Help complete the 300B schematic
  134. Confusion about a 5Y3GT rectifier
  135. Need advice on 300B circuit
  136. PCB in components
  137. new 6080 dc pp
  138. Single ended to balanced Aikido with mosfets in buffer position
  139. Simple LED power indicator light circuit?
  140. about 83 mercury rectifier
  141. Aikido Zo Calculation
  142. Line out issue - 1965 Ampeg B-18-N
  143. Pavane/ Psvane 845, 805, 211, 12AX7, 12AU7, 12AT7 and EL84
  144. Is this Telefunken fake or OEM?
  145. About Hmmmmm
  146. PRE-AMP PROJECT SRPP + HEADPHONE AMP
  147. 6BN11 vs 6CB6
  148. Is output stage local feedback necessary?
  149. Tube Longevity
  150. Power triode drive current requirements
  151. OPT Selection Question
  152. Recommend me a 6V6 P-P schematic
  153. Requesting advice on a pre-amp build. I'm working on asking realistic questions.
  154. So, im going to replace the Alps with a PEC...someone help?
  155. 13e1 se "shade" some questions
  156. Pio russian capacitor K42-11...is good ?
  157. My first build VTA ST-120
  158. World Wide Audio, model: HBP-97a, Hybrid Power Amplifier - info needed
  159. DIY 50C5 mini amp...
  160. So you think you have cool tubes?????
  161. Layout
  162. Looking to ID this amp
  163. Help me to make tube amply
  164. CAT SL1 SIGNATURE schematik phono
  165. Have anyone built this 6V6 amp?
  166. GU-50 in Single-Ended Triode Configuration - What bias points?
  167. DC coupling on a LTP? Opinions and help needed on Fred's design.
  168. Power Selection - Help Needed
  169. Which speaker with a 1/4W tube amp?
  170. 6973 VS 6CZ5 substitute
  171. Third Reich tubes
  172. Hello...and another ST-70 project.
  173. Home theater magic smoke...smoked and I think I heard a mirror crack...
  174. Scott LK48-B restoration
  175. 3 - 12AU7 Preamp. Is there such an animal?
  176. 300b filament
  177. resistor 880 ohms cathode
  178. Anyone have a Bugle Boy logo
  179. Change of circuit from triode to tetrode
  180. Need upgrade info for my Atma-Sphere Novacron Amps
  181. Whats Vintage Testing Equipment Do YOU Have/Use?
  182. JJ Kt77 Bias?
  183. tube rectified psu
  184. HELP!: my SET amp was turned off without a load and now it sound veiled!
  185. 5842 grid leak
  186. AMI Jukebox speaker impedence question
  187. Advice Needed: "Flabby" Amp Low-End
  188. Aikido transformer coupled output
  189. Audio measurements on tube amp. ? look here
  190. 12BH7A driver stage help
  191. Audio drive to g2 connected to g1 via 15K0
  192. KT88 SE Complete Kit
  193. Any high-end 6BM8 push pull tube amp schematic ?
  194. How a Triode Works
  195. EL3N substitute
  196. Magnavox AMP-185
  197. Best 6V6G that won't get me divorced..
  198. Shorted EL34 ?
  199. ARC VS60 hum in speaker
  200. Need help for a bias circuit
  201. Eico HF20 Output Txr Questions
  202. A Radford STA15 restoration story
  203. Tube Testing in DC Area
  204. Thorens PR24
  205. Newbie here with a couple questions
  206. 300B SwitchMode filament supply
  207. Mixed bias for balancing unmatched tubes in PPP?
  208. My First DIY Experience: An Aikido/Tetra Preamp
  209. how to test chokes for current and voltage
  210. pictures miniblok 1 and miniblok 2 by fred nachbaur
  211. Help with Aikido Preamp+class d amp
  212. will a PTX without center tap work?
  213. Anyone have information on 300B silvertone tube
  214. 6P14P push pull with low output
  215. passive 30Hz-20kHz Bandpass filter for tube preamp?
  216. My First Amp
  217. Frank's 6sn7 preamp
  218. My new 300B Amp
  219. help troubleshooting gradually distorting tube amp (dropping b+ voltage when hot)
  220. Tube Gear Supply/Surplus in Houston Area
  221. What 2a3 ?
  222. long tailed pair - need more gain
  223. how to bypass the volume pot on my SET amp?
  224. 2 stage AIKIDO
  225. Guys please help me with my Jolida 102B!
  226. Philbrick GAP/R K2-W question
  227. First time baby Huey amplifier build
  228. 6LB6's....
  229. LMG Capacitor
  230. Meng 6PI Biasing Question
  231. AIKIDO LV WON'T START
  232. Under rating of Vertical Sweep Tubes
  233. Simple 845 tube monoblock design
  234. Running on filament only
  235. soft stat
  236. BJT Bias?
  237. Preamp Squeal
  238. Hammond L101 compensation cap
  239. Powering a headphone amplifier with DC filament supply
  240. new to this
  241. miniblok 1 voltage problem
  242. How will this affect my amp?
  243. Tetra Phono Builders...got problems!
  244. yagoolar's tube amp projects
  245. Base material of GEC KT88 Feb 1960
  246. Headphone amp with 6n2p valve on 12V
  247. pcc189 for audio use
  248. Reading material
  249. 2A3 rectifier
  250. help calibrating a mercury model 1000 tube tester

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