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  1. 12ax7 pre amp + solid state power amp
  2. Preamp for Tim Mellow's 6C33C OTL
  3. Power supply buzz
  4. How to make a PCB with 15 years old Positiv 20
  5. Circuit query
  6. 845/211 driver circuits
  7. A question about the Malanz 7
  8. Looking for four KT90 Ei
  9. Dynaco PAS transformer breakdown
  10. where do you find your tube treasures
  11. 5670 Thoughts?
  12. looking to build or buy a cheep preamp
  13. Trying to achieve 25-30 watts... help please!
  14. RCA Reel to Reel Conversion??
  15. AA5 Tube Radio Design using 2010 Techniques
  16. I found a use for surplus tubes
  17. Edcor CXPP-30-MS-3.8K OPT
  18. Which tube does my amp use? 845 or 211
  19. Coupling cap replacement in series?
  20. electronique practique
  21. New PNP HV tranny for anode CCS
  22. tube reliability
  23. Hybrid dreams
  24. Triode Electronics 30W SE Transformer
  25. SMALL SIZE OUTPUT TRANSFORMERS
  26. headphone amp with 7025?
  27. Separation of preamp and power amp
  28. Aikido 9pin with 6n1p and 6n6p as Headphone
  29. PreAmp output transformers
  30. Line-out on tubes
  31. Would this scheme work ?
  32. differential cascode patented in 2007
  33. Question about AMP185 Rectifier Circuit
  34. correct heater wiring
  35. Speaker snap or crack (no pop)
  36. Very long cables
  37. Help! 2A3 SET quit after hot restart
  38. INTEGRATED HYBRID AMP WITH NO LOAD
  39. ECC88 symbol problem in TINA-TI
  40. 12AX7 preamp on 375V
  41. The Blue Velvet Line Preamp with 7193 instead of 6SN7
  42. Increase idle current on my KT77's?
  43. Yet another nutty idea - don't say I didn't warn
  44. Need help calibrating a Hickok 6000 Chicago
  45. need someone to run a sim in PSUD2...my PC is down and my MAC wont runt the program!!
  46. Building an B-15-inspired amp
  47. China preamp Xiang Sheng 768A
  48. RE: Fisher 200 tube amp fuse blowing issue
  49. How do you match output tubes?
  50. Best Dyna ST-70 rebuild kit?
  51. Help with tube wiring
  52. Decided on Gibson GA 20 need layout drawings etc.
  53. st70 problem
  54. Help with info on old valve amp
  55. Exceeding V-heater-cathode
  56. Cayin/Sparks A- 50T schematic.
  57. Looking for Bi siemens datasheet
  58. Transformers, transformers, transformers...
  59. Need ideas for my 6V6 from 1946 Blues / rockabilly
  60. Quasi complimentary output stage?
  61. 4ohm output transformer with 8ohm speaker
  62. First DIY project for a good power Amplifier
  63. Cherry red plates
  64. DIY triode
  65. First post/build
  66. New Transformer Vendor In Belgium
  67. KT88 grid stopper
  68. Connecting valve shields to earth
  69. Shindo MAZERIS BELLEVUS MODEL 454-2xAttenuator-How works this Circuit? 6067+12BH7
  70. Fixed bias failure B+ switch off protection
  71. Who can tell me where to buy Caddock MS220
  72. Uses for Quicksilver Transformers
  73. SE amp problem
  74. EL-34 to 6P3S-E
  75. 6922 sepp with Balanced Gains
  76. What path to choose for Hamonica amplifier?
  77. tubes for these OPT?, pri 1.75Kohm, sec 2.5, 4, 8ohm, taps 20%, weight 4Kg
  78. Turning a 6.3 V secondary into a 5 V secondary on an Antek 2T350
  79. gridchokes/output caps
  80. Can I build an MC30?
  81. Cathodyne: Can someone please help me fill in the blanks ?
  82. help hovland hp200
  83. 6SL7 and 6AS7 PP amplifier, design advice needed
  84. Project: Baldwin Tube Amp...
  85. Power Supply Input Capacitor - JE simple 45 question
  86. Tube output: Voltage or Current source?
  87. Edcor's new E-store website.....finally!
  88. Help complete the 300B schematic
  89. Confusion about a 5Y3GT rectifier
  90. Need advice on 300B circuit
  91. PCB in components
  92. new 6080 dc pp
  93. Single ended to balanced Aikido with mosfets in buffer position
  94. Simple LED power indicator light circuit?
  95. about 83 mercury rectifier
  96. Aikido Zo Calculation
  97. Line out issue - 1965 Ampeg B-18-N
  98. Pavane/ Psvane 845, 805, 211, 12AX7, 12AU7, 12AT7 and EL84
  99. Is this Telefunken fake or OEM?
  100. About Hmmmmm
  101. PRE-AMP PROJECT SRPP + HEADPHONE AMP
  102. 6BN11 vs 6CB6
  103. Is output stage local feedback necessary?
  104. Tube Longevity
  105. Power triode drive current requirements
  106. OPT Selection Question
  107. Recommend me a 6V6 P-P schematic
  108. Requesting advice on a pre-amp build. I'm working on asking realistic questions.
  109. So, im going to replace the Alps with a PEC...someone help?
  110. 13e1 se "shade" some questions
  111. Pio russian capacitor K42-11...is good ?
  112. My first build VTA ST-120
  113. World Wide Audio, model: HBP-97a, Hybrid Power Amplifier - info needed
  114. DIY 50C5 mini amp...
  115. So you think you have cool tubes?????
  116. Layout
  117. Looking to ID this amp
  118. Help me to make tube amply
  119. CAT SL1 SIGNATURE schematik phono
  120. Have anyone built this 6V6 amp?
  121. GU-50 in Single-Ended Triode Configuration - What bias points?
  122. DC coupling on a LTP? Opinions and help needed on Fred's design.
  123. Power Selection - Help Needed
  124. Which speaker with a 1/4W tube amp?
  125. 6973 VS 6CZ5 substitute
  126. Third Reich tubes
  127. Hello...and another ST-70 project.
  128. Home theater magic smoke...smoked and I think I heard a mirror crack...
  129. Scott LK48-B restoration
  130. 3 - 12AU7 Preamp. Is there such an animal?
  131. 300b filament
  132. resistor 880 ohms cathode
  133. Anyone have a Bugle Boy logo
  134. Change of circuit from triode to tetrode
  135. Need upgrade info for my Atma-Sphere Novacron Amps
  136. Whats Vintage Testing Equipment Do YOU Have/Use?
  137. JJ Kt77 Bias?
  138. tube rectified psu
  139. HELP!: my SET amp was turned off without a load and now it sound veiled!
  140. 5842 grid leak
  141. AMI Jukebox speaker impedence question
  142. Advice Needed: "Flabby" Amp Low-End
  143. Aikido transformer coupled output
  144. Audio measurements on tube amp. ? look here
  145. 12BH7A driver stage help
  146. Audio drive to g2 connected to g1 via 15K0
  147. KT88 SE Complete Kit
  148. Any high-end 6BM8 push pull tube amp schematic ?
  149. How a Triode Works
  150. EL3N substitute
  151. Magnavox AMP-185
  152. Best 6V6G that won't get me divorced..
  153. Shorted EL34 ?
  154. ARC VS60 hum in speaker
  155. Need help for a bias circuit
  156. Eico HF20 Output Txr Questions
  157. A Radford STA15 restoration story
  158. Tube Testing in DC Area
  159. Thorens PR24
  160. Newbie here with a couple questions
  161. 300B SwitchMode filament supply
  162. Mixed bias for balancing unmatched tubes in PPP?
  163. My First DIY Experience: An Aikido/Tetra Preamp
  164. how to test chokes for current and voltage
  165. pictures miniblok 1 and miniblok 2 by fred nachbaur
  166. Help with Aikido Preamp+class d amp
  167. will a PTX without center tap work?
  168. Anyone have information on 300B silvertone tube
  169. 6P14P push pull with low output
  170. passive 30Hz-20kHz Bandpass filter for tube preamp?
  171. My First Amp
  172. Frank's 6sn7 preamp
  173. My new 300B Amp
  174. help troubleshooting gradually distorting tube amp (dropping b+ voltage when hot)
  175. Tube Gear Supply/Surplus in Houston Area
  176. What 2a3 ?
  177. long tailed pair - need more gain
  178. how to bypass the volume pot on my SET amp?
  179. 2 stage AIKIDO
  180. Guys please help me with my Jolida 102B!
  181. Philbrick GAP/R K2-W question
  182. First time baby Huey amplifier build
  183. 6LB6's....
  184. LMG Capacitor
  185. Meng 6PI Biasing Question
  186. AIKIDO LV WON'T START
  187. Under rating of Vertical Sweep Tubes
  188. Simple 845 tube monoblock design
  189. Running on filament only
  190. soft stat
  191. BJT Bias?
  192. Preamp Squeal
  193. Hammond L101 compensation cap
  194. Powering a headphone amplifier with DC filament supply
  195. new to this
  196. miniblok 1 voltage problem
  197. How will this affect my amp?
  198. Tetra Phono Builders...got problems!
  199. yagoolar's tube amp projects
  200. Base material of GEC KT88 Feb 1960
  201. Headphone amp with 6n2p valve on 12V
  202. pcc189 for audio use
  203. Reading material
  204. 2A3 rectifier
  205. help calibrating a mercury model 1000 tube tester
  206. 866a valve test
  207. Anybody in the Knoxville area?
  208. Looking for simple Push-Pull tricks (from Baby Huey) #1
  209. Why wire an output transformer as autoformer ? (parafeed)
  210. Measuring unwanted grid current
  211. Tube companies
  212. heathkit a7???guitar amp
  213. Hi Performance Pre amp
  214. HH Scott Type 209 Amp
  215. 6l6gb PP w/fixed bias?
  216. Holy cow! Can anyone tell me why this wire is so pricey?
  217. EL34B 6N9P 5Z3P amplifier kit - any thoughts on schematic?
  218. 4 x EL84 in UL PP, 470 B+!! is this right
  219. What amp is this?
  220. PS Setup For Testing
  221. OTL designed by Tim Mellow with 4 6C33C?
  222. Bassman 100 schematic questions
  223. Quick question on this schematic
  224. Variac, how to ?
  225. Tube data sheets - inaccuracy
  226. Benny's new ForeWatt SRPP pre amplifier
  227. OddWatt PP UL amplifier from scratch
  228. OPT Impedance
  229. Rectifier Valves
  230. WE311 amp
  231. Sherwood S8000 transformers
  232. yaqin MS-12B Search for Diagrams
  233. EICO HF-30 - Schematic
  234. 12AU7 Phono Stage
  235. How to install a motor run capcitor
  236. Sanity check on B+ regulator
  237. 6B4G PPP idea
  238. First OTL breadboarded
  239. New amp build
  240. Tube Parametric EQ - Idea looking for clarification
  241. Peavey Valveking 100- static sound during warm-up
  242. My Fender Twin Amp Not Working - get your guesses in
  243. DHT heater supply
  244. MC/MM Phono Pream PCB
  245. Help Identifying Old Westinghouse Tube Amp?
  246. GM70 SE Amplifier
  247. OPT considerations
  248. Help - the pre amp I made is not working!
  249. Aikido tube connections.
  250. EL34 PP output tranny questions

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