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  1. Time to replace my 50 year old filter caps...
  2. Amazingly low distortion -- Radford-based design
  3. To ground or not to ground the OPT secondary, that is the question
  4. Ultralinear Observations and Questions
  5. FEEDBACK DELAY TIME
  6. 6SN7 v 6N8P v 6H8C
  7. NOS radio parts awaiting for my pick up!
  8. Toroidal Transformer Cover
  9. VTV 6sn7 line stage project
  10. can something be made using these tubes
  11. Help! Need tube tester info for 6CW4 Nuvistor
  12. Hampton MC preamp
  13. J-fet - tube DAC analog stage
  14. geloso 3270 power amplifier
  15. Belton micalex tube sockets any experience ?
  16. DeathTrap 500 - An Engineer's approach to the 300B SET
  17. My First Power Supply
  18. 5aR4 Rectifier Problem, Help! Little Long
  19. Electrolytic vs Polypropylene cathode
  20. Size of 5Y3 tubes?
  21. 3C24 really is a fine output tube...
  22. Yaqin MC100B Newbie Questions
  23. JE simple 45 SE grid leak resistor question
  24. 26 vs 27
  25. Bypass the tone control
  26. CCS with VN2222L
  27. Adding a ground with a 3 prong cable and connector
  28. European Made 6080/6AS7
  29. PFL200, what can I use them to?
  30. 7W7 tube - how it competes with other pentodes as driver?
  31. 1959 Blaupunkt receiver capacitors -Newbie
  32. i have one 5672 tube (new)
  33. 12ax7 pre amp + solid state power amp
  34. Preamp for Tim Mellow's 6C33C OTL
  35. Power supply buzz
  36. How to make a PCB with 15 years old Positiv 20
  37. Circuit query
  38. 845/211 driver circuits
  39. A question about the Malanz 7
  40. Looking for four KT90 Ei
  41. Dynaco PAS transformer breakdown
  42. where do you find your tube treasures
  43. 5670 Thoughts?
  44. looking to build or buy a cheep preamp
  45. Trying to achieve 25-30 watts... help please!
  46. RCA Reel to Reel Conversion??
  47. AA5 Tube Radio Design using 2010 Techniques
  48. I found a use for surplus tubes
  49. Edcor CXPP-30-MS-3.8K OPT
  50. Which tube does my amp use? 845 or 211
  51. Coupling cap replacement in series?
  52. electronique practique
  53. New PNP HV tranny for anode CCS
  54. tube reliability
  55. Hybrid dreams
  56. Triode Electronics 30W SE Transformer
  57. SMALL SIZE OUTPUT TRANSFORMERS
  58. headphone amp with 7025?
  59. Separation of preamp and power amp
  60. Aikido 9pin with 6n1p and 6n6p as Headphone
  61. PreAmp output transformers
  62. Line-out on tubes
  63. Would this scheme work ?
  64. differential cascode patented in 2007
  65. Question about AMP185 Rectifier Circuit
  66. correct heater wiring
  67. Speaker snap or crack (no pop)
  68. Very long cables
  69. Help! 2A3 SET quit after hot restart
  70. INTEGRATED HYBRID AMP WITH NO LOAD
  71. ECC88 symbol problem in TINA-TI
  72. 12AX7 preamp on 375V
  73. The Blue Velvet Line Preamp with 7193 instead of 6SN7
  74. Increase idle current on my KT77's?
  75. Yet another nutty idea - don't say I didn't warn
  76. Need help calibrating a Hickok 6000 Chicago
  77. need someone to run a sim in PSUD2...my PC is down and my MAC wont runt the program!!
  78. Building an B-15-inspired amp
  79. China preamp Xiang Sheng 768A
  80. RE: Fisher 200 tube amp fuse blowing issue
  81. How do you match output tubes?
  82. Best Dyna ST-70 rebuild kit?
  83. Help with tube wiring
  84. Decided on Gibson GA 20 need layout drawings etc.
  85. st70 problem
  86. Help with info on old valve amp
  87. Exceeding V-heater-cathode
  88. Cayin/Sparks A- 50T schematic.
  89. Looking for Bi siemens datasheet
  90. Transformers, transformers, transformers...
  91. Need ideas for my 6V6 from 1946 Blues / rockabilly
  92. Quasi complimentary output stage?
  93. 4ohm output transformer with 8ohm speaker
  94. First DIY project for a good power Amplifier
  95. Cherry red plates
  96. DIY triode
  97. First post/build
  98. New Transformer Vendor In Belgium
  99. KT88 grid stopper
  100. Connecting valve shields to earth
  101. Shindo MAZERIS BELLEVUS MODEL 454-2xAttenuator-How works this Circuit? 6067+12BH7
  102. Fixed bias failure B+ switch off protection
  103. Who can tell me where to buy Caddock MS220
  104. Uses for Quicksilver Transformers
  105. SE amp problem
  106. EL-34 to 6P3S-E
  107. 6922 sepp with Balanced Gains
  108. What path to choose for Hamonica amplifier?
  109. tubes for these OPT?, pri 1.75Kohm, sec 2.5, 4, 8ohm, taps 20%, weight 4Kg
  110. Turning a 6.3 V secondary into a 5 V secondary on an Antek 2T350
  111. gridchokes/output caps
  112. Can I build an MC30?
  113. Cathodyne: Can someone please help me fill in the blanks ?
  114. help hovland hp200
  115. 6SL7 and 6AS7 PP amplifier, design advice needed
  116. Project: Baldwin Tube Amp...
  117. Power Supply Input Capacitor - JE simple 45 question
  118. Tube output: Voltage or Current source?
  119. Edcor's new E-store website.....finally!
  120. Help complete the 300B schematic
  121. Confusion about a 5Y3GT rectifier
  122. Need advice on 300B circuit
  123. PCB in components
  124. new 6080 dc pp
  125. Single ended to balanced Aikido with mosfets in buffer position
  126. Simple LED power indicator light circuit?
  127. about 83 mercury rectifier
  128. Aikido Zo Calculation
  129. Line out issue - 1965 Ampeg B-18-N
  130. Pavane/ Psvane 845, 805, 211, 12AX7, 12AU7, 12AT7 and EL84
  131. Is this Telefunken fake or OEM?
  132. About Hmmmmm
  133. PRE-AMP PROJECT SRPP + HEADPHONE AMP
  134. 6BN11 vs 6CB6
  135. Is output stage local feedback necessary?
  136. Tube Longevity
  137. Power triode drive current requirements
  138. OPT Selection Question
  139. Recommend me a 6V6 P-P schematic
  140. Requesting advice on a pre-amp build. I'm working on asking realistic questions.
  141. So, im going to replace the Alps with a PEC...someone help?
  142. 13e1 se "shade" some questions
  143. Pio russian capacitor K42-11...is good ?
  144. My first build VTA ST-120
  145. World Wide Audio, model: HBP-97a, Hybrid Power Amplifier - info needed
  146. DIY 50C5 mini amp...
  147. So you think you have cool tubes?????
  148. Layout
  149. Looking to ID this amp
  150. Help me to make tube amply
  151. CAT SL1 SIGNATURE schematik phono
  152. Have anyone built this 6V6 amp?
  153. GU-50 in Single-Ended Triode Configuration - What bias points?
  154. DC coupling on a LTP? Opinions and help needed on Fred's design.
  155. Power Selection - Help Needed
  156. Which speaker with a 1/4W tube amp?
  157. 6973 VS 6CZ5 substitute
  158. Third Reich tubes
  159. Hello...and another ST-70 project.
  160. Home theater magic smoke...smoked and I think I heard a mirror crack...
  161. Scott LK48-B restoration
  162. 3 - 12AU7 Preamp. Is there such an animal?
  163. 300b filament
  164. resistor 880 ohms cathode
  165. Anyone have a Bugle Boy logo
  166. Change of circuit from triode to tetrode
  167. Need upgrade info for my Atma-Sphere Novacron Amps
  168. Whats Vintage Testing Equipment Do YOU Have/Use?
  169. JJ Kt77 Bias?
  170. tube rectified psu
  171. HELP!: my SET amp was turned off without a load and now it sound veiled!
  172. 5842 grid leak
  173. AMI Jukebox speaker impedence question
  174. Advice Needed: "Flabby" Amp Low-End
  175. Aikido transformer coupled output
  176. Audio measurements on tube amp. ? look here
  177. 12BH7A driver stage help
  178. Audio drive to g2 connected to g1 via 15K0
  179. KT88 SE Complete Kit
  180. Any high-end 6BM8 push pull tube amp schematic ?
  181. How a Triode Works
  182. EL3N substitute
  183. Magnavox AMP-185
  184. Best 6V6G that won't get me divorced..
  185. Shorted EL34 ?
  186. ARC VS60 hum in speaker
  187. Need help for a bias circuit
  188. Eico HF20 Output Txr Questions
  189. A Radford STA15 restoration story
  190. Tube Testing in DC Area
  191. Thorens PR24
  192. Newbie here with a couple questions
  193. 300B SwitchMode filament supply
  194. Mixed bias for balancing unmatched tubes in PPP?
  195. My First DIY Experience: An Aikido/Tetra Preamp
  196. how to test chokes for current and voltage
  197. pictures miniblok 1 and miniblok 2 by fred nachbaur
  198. Help with Aikido Preamp+class d amp
  199. will a PTX without center tap work?
  200. Anyone have information on 300B silvertone tube
  201. 6P14P push pull with low output
  202. passive 30Hz-20kHz Bandpass filter for tube preamp?
  203. My First Amp
  204. Frank's 6sn7 preamp
  205. My new 300B Amp
  206. help troubleshooting gradually distorting tube amp (dropping b+ voltage when hot)
  207. Tube Gear Supply/Surplus in Houston Area
  208. What 2a3 ?
  209. long tailed pair - need more gain
  210. how to bypass the volume pot on my SET amp?
  211. 2 stage AIKIDO
  212. Guys please help me with my Jolida 102B!
  213. Philbrick GAP/R K2-W question
  214. First time baby Huey amplifier build
  215. 6LB6's....
  216. LMG Capacitor
  217. Meng 6PI Biasing Question
  218. AIKIDO LV WON'T START
  219. Under rating of Vertical Sweep Tubes
  220. Simple 845 tube monoblock design
  221. Running on filament only
  222. soft stat
  223. BJT Bias?
  224. Preamp Squeal
  225. Hammond L101 compensation cap
  226. Powering a headphone amplifier with DC filament supply
  227. new to this
  228. miniblok 1 voltage problem
  229. How will this affect my amp?
  230. Tetra Phono Builders...got problems!
  231. yagoolar's tube amp projects
  232. Base material of GEC KT88 Feb 1960
  233. Headphone amp with 6n2p valve on 12V
  234. pcc189 for audio use
  235. Reading material
  236. 2A3 rectifier
  237. help calibrating a mercury model 1000 tube tester
  238. 866a valve test
  239. Anybody in the Knoxville area?
  240. Looking for simple Push-Pull tricks (from Baby Huey) #1
  241. Why wire an output transformer as autoformer ? (parafeed)
  242. Measuring unwanted grid current
  243. Tube companies
  244. heathkit a7???guitar amp
  245. Hi Performance Pre amp
  246. HH Scott Type 209 Amp
  247. 6l6gb PP w/fixed bias?
  248. Holy cow! Can anyone tell me why this wire is so pricey?
  249. EL34B 6N9P 5Z3P amplifier kit - any thoughts on schematic?
  250. 4 x EL84 in UL PP, 470 B+!! is this right

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