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  1. Looking for dual power triodes.
  2. Need advice selecting a 2A3 design
  3. Feedback basics
  4. tubalizer..
  5. The 6b4g
  6. 6N6P Operating Points
  7. Lundahl+EL84 PP+concertina+input stage
  8. Help wanted for a truly loco project. (A Tube--gainclone hybrid guitar amp!)
  9. Looking for circuit of SE amp. for Eimac 100TH
  10. Counterpoint Sa-3000 Circuit Diagram
  11. compressor Faiirchild 670 DIY
  12. How much headroom for a choke---to stop it from humming?
  13. Bay Area Diy Festival
  14. Using Eagle for Tubes designs
  15. Worst that could happen?
  16. Identifying output tx.
  17. Small pre
  18. Cathode follower driver
  19. comment on this B+ supply
  20. ODD TUBES, what to look for?
  21. 2A3 SE and Edcorp tranny
  22. Differential amplifier with 12AX7
  23. Bogen Challenger CH30 Amplifier
  24. do I need to use a heatsink on a DN2540 in a B+ supply?
  25. Transformer, 10K 1:1 - which one?
  26. Where to find Blackgate Caps?
  27. Passive Pre-Amp causes huge power loss?
  28. Rubbish fluorescent tubes: Eterna Lighting (UK), GE (US)
  29. Melos TM90 ST schematic?
  30. My first tube preamplifier:)
  31. here is one for the rare tube heads...6GY8, 6EZ8
  32. Opinions on the Conrad Johnson MV75 amplifier please.
  33. Favorite Tubes
  34. SS replacement for 83 tube ?
  35. AMC CVT 2030 Output Transformer.
  36. 6-ohm speaker to tube amp
  37. What tubes share the pinout with the 5687?
  38. SMPS for B+ discussion
  39. Building a 200W+ bass amp
  40. need help understanding voltage regulator schematic (using CCS) from Raleigh Audio
  41. SS No R No C Power Supply for Tubes
  42. FREDs? Replace 1N4003 rectifier diodes?
  43. Hot running regulated dc filament supply for aikido preamp
  44. B+ TX. overkill?
  45. 33 Power Pentode Design Pointers Needed
  46. What Wiki?
  47. help understanding updated DRD from J Elliano's site (using 6AN4 instead of 6n1p)
  48. Zen SE84TS
  49. 5687 tube
  50. Tube vs. Semiconducter rectification
  51. Bogen CHB35 Mods and Preamp ideas
  52. I Want To Build A 100+Watt per/channel Tube Poweramp
  53. Phonodude problem
  54. enjoythemusic's t-rex amp: where is the +70VDC tap?
  55. Earthing and how it effects sound.
  56. Rectifier question
  57. Help for SE Main Transformer
  58. 6D22S Getter Question
  59. Repair of a McIntosh MC225 power amp
  60. OPA627 with tube buffer....
  61. Bell Stereophonic 3030 help
  62. Choosing the line stage preamp.
  63. I Need Help, Mcintosh/Marantz 7 content
  64. For 45 > 845: selecting an 9.5/ 10 Interstage
  65. How to reduce gain of this Tube Preamplifier ?
  66. looking for pp amp schematic without nfb
  67. Pseudo dual mono PS?
  68. WE404A drive 6L6 solution
  69. Looking for info on loudness control
  70. Tubes and minority carriers
  71. suggestions for 3 projects please
  72. DIY tube preamp kit
  73. M6 lamination: what is it?
  74. why is it that most tube projects uses copper sheetmetal?
  75. Sources in the Philippines / Manila
  76. Tube noise - Help
  77. Strange reverb circuit
  78. Tiny tube amp
  79. DC heating directly heated output valves
  80. Alps 250k in a Pas-3 Question
  81. 1st cap heats up...
  82. RCA VR Tube engineering data
  83. dropping heater voltage
  84. Please Help with Sound Valves M40 Monoblock Bias Adjustment Procedure!!!
  85. Old Sony SE OPT's /w 600r tap... cathode feedback maybe?
  86. Which is the poor man 45 tube?
  87. Audio Note Low Gain Quest Power Amplifier
  88. Quad II: Which resistors?
  89. Designing a preamp with two tubes
  90. ARC Classic 30 problem
  91. Why does the 6AS7 have such high Miller capacitance ?
  92. Driving an unusal Z=1k5-2k input spring reverb w/o tranny
  93. serching 5A6 beam power pentode data/curves/schematics for AF practice amp
  94. HPHV regulator measurement
  95. DHT Topology Comparison Question
  96. Secondary Tap of Power Transformer?
  97. Soft-clipping Circuit/tubecad
  98. lack of bass in a 6h30 design
  99. Difference between two novals
  100. C3g
  101. All Tube Stereo power amplifier
  102. what gas VR tube?
  103. KT88 schematic
  104. Help me understand the topologies here...
  105. Finished my Amp, Need to build a PS
  106. Push-Pull driver stage?
  107. Floating the heaters
  108. Replacing Power Transformer
  109. When car audio & tubes collide...
  110. 6N6P and 6SN7 Operating point suggestions
  111. NOS pF capacitors voltage rating?
  112. Tubes in Vietnam
  113. Passive pre order?
  114. layout help
  115. junkbox amp help
  116. required specs of an input step up transformer, into a 45, to allow it drive an 845
  117. 6as7 SRPP output stage
  118. Bias range and selenium rectifier
  119. OTL's and aircraft transformers
  120. PSE EL34 - valve rectification question
  121. A 2a3 Amplifier
  122. James Transformer **
  123. Plate Voltage on 12ax7a
  124. Parallel Triodes and Load Lines
  125. Steve Bench OTL
  126. High power P-P EL34/6550/KT88 amp suggestions
  127. Stepped attenuators - break before make?
  128. audionote 144 OPT comment pls...
  129. KT88 and Hammond Transformer Schematics
  130. How do I know that my measured AC voltage is precise?
  131. 6C33B-C push pull with output transformer
  132. EL84 grid voltage?
  133. seperate power supply?
  134. Mysterious tektronix power supply
  135. tube amp subwoofer hum problem
  136. How to test transformer's current rating?
  137. Death/Black Metal sound on Crate 6212
  138. 4654/4699 pentodes
  139. Output tubes on a Marshall JCM900
  140. vacuum tube logic gate
  141. Screen current
  142. Any tube-sleuths out there know who made these Daystrom tubes?
  143. With this meter reading, enough to know Fuse is the culprit?
  144. need comments on amp design
  145. KEF/Celestion speakers for tube use...
  146. Another cheap fix - MOT as plate choke.
  147. XAM Mark II B
  148. How to test voltages on secondaries?
  149. Audio innovation L1 valve replacement
  150. Is this in-rush current?
  151. TETRODE amplifiers
  152. Audio Shop Eifl Corporation
  153. 6sn7 Buffer
  154. Marantz 8b operating voltages
  155. amplifier with 813 valves
  156. Changing plate resistor in live circuitry.
  157. 2xEL34 vs. 4xEL84 vs. 2x6L6 vs. 4x6V6
  158. KT88 drivers
  159. Simple Hybrid SE EL84 UL amp.. comments please.
  160. max input impedance for // el84's and other ?
  161. Please Help.. PCL81
  162. Some troubles with PSUD. A little help please !
  163. Why D getters?
  164. Help me information of the tubes?
  165. Questions about this line stage
  166. 5Z4P rectifier tube question
  167. Need help from Aikido builder
  168. Aikesi賍机el34尋找國外代理，可以送一台！！
  169. Direct heating triodes are really better?
  170. Audio Reality is back, in digital format
  171. Stoetkit 25W integrated amp
  172. Switchable stages with Tubelab抯 hybrid MOSFET/ 845 SE amp?
  173. Tube Pre Amplifier for SEWA 7 Watt ClassA MOSFET
  174. Michaelson Audio Odysseus Problem.
  175. ASC metal can polypro caps: ground the metal can to AC ground?
  176. anyone living in australia (hopefully adelaide) willing to lend their puncher/bit?
  177. ReinoutdV
  178. Priboj amp schematic
  179. EL84 in ultra-linear mode
  180. internal shielding
  181. RIAA: what does it stand for?
  182. Socket Mounting Rings
  183. heathkit sa2 - new question
  184. RCA R35, 39 & 57 Terminal Usage...
  185. 45 into an 845 parafeed circuit
  186. Tubes power supply 220 t0 300V ?
  187. ripple values in B+ supply
  188. Capacitors and tubes for AA5?
  189. Dynaco PAS Rebuild
  190. Audio Research SP9 Circuit Diagram HELP!
  191. ARC reference II schematic
  192. 71a Line Stage and Miller Capacitance
  193. Low plate voltage pentode (<40v) for diff pair?
  194. loadlines for newbie.
  195. Measuring approx RMS power O/P
  196. Hybrid Aikido-ish gain stage
  197. Loftin-White coupling Questions
  198. 807 screen regulation
  199. What kills an opt tranny?
  200. EAR529 schematic diagram
  201. World Designs KEL84 Valve Amplifier
  202. what 300B design would you recommend but...
  203. Replacement conductance meter for Hickok 533A
  204. My RIAA Phono Stage Project
  205. A2 Questions
  206. World Audio Design
  207. Seek for your comments/advice to newbie on Tube world
  208. CCSed LTP validity?
  209. Suitability of transmitter tubes for musical amplifiers
  210. Anyone using an 813 in pentode?
  211. Electrolytic in the feedback loop
  212. El34 PP Vs. El34 PSE
  213. RIAA Phono Amp Design
  214. Matching resistors to 1% or Better
  215. Wirewound cathode resistor
  216. Tube Hybrid Amp.
  217. Nasty ground loop
  218. ECC88 Class B
  219. Cree diodes
  220. Old Tube Amp Servicer In Nj???
  221. Vg-k max
  222. Anyone used PT15 / VT104 ?
  223. rebuild a Musical Fidelity X-10D ??
  224. Transformer Building
  225. Identifying weird signal transformer
  226. 100watt mono blocks
  227. Resistor combination calculator - RESCALC
  228. Aikido choice of valves (or tubes, if you will)
  229. Pin 9 on 6n6P, 6H30, etc
  230. Croft Super Micro meets Acoustat TNT200
  231. tube mic preamp kit??
  232. The SACD Meets Tubes
  233. Useful Abbreviations
  234. cap value for 6X4 rectifier?
  235. One B+ for the both driver and output tube if they are identical?
  236. Fisher 500B Schematic Question
  237. SE Output Transfromers Question
  238. Amplifier Project
  239. Grid Stopper for parallel sides of dual triode
  240. centre tap or floating heaters?
  241. Converting 6.3V to 6.3VCT Quick questions
  242. Russian Nuvistors...Anyone tried them?
  243. 一台300bc胆机，大家给点意见，谢谢
  244. Australian Amp Manufacturers
  245. Old radio quick question re PS
  246. Kt90 Pse
  247. Velleman K4040 is Always Blowing Output Tubes
  248. looking for transformer with the following specs?
  249. 5686 amplifier schematic
  250. Heaters for cathodes with a large swing