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  1. problem on thorens PR15 (strange filaments circuity)
  2. My 1W 5687 SE Direct Coupled Power Amp
  3. VT-25 linestage + step-down trafo
  4. What to do with 803's
  5. Newbie: KT88 amp info needed
  6. 805 tube amp, uProcessor controlled
  7. Class A Tube BJT Hybrid
  8. John Broskie's enhanced T8
  9. Audio Research SP6 E
  10. Andr Charlin anybody got his Tube Amp
  11. Info needed - Shuguang SG120-C Integrated Amp
  12. Help with 6SN7 preamp
  13. 12b4 vs. aikido linestage
  14. KT88/6550 as Triode
  15. 6AU6WA triode connected as a line amp?
  16. A few basic noobie questions.
  17. Which connector for PSU/chassis B+ supply?
  18. Quad II-Forty schematic ?:
  19. Audio Research Manuals
  20. I was thinking
  21. silicon or tube rectifier?
  22. Is this OK for the Etude Preamp?
  23. gary pimm's latest self-biasing CCS circuit
  24. 46 tube pre
  25. BEZ T9B Intermittent problem
  26. Heathkit W-5M rebuild
  27. Masco MA25N repair
  28. Sunday's Project
  29. 5881- 6l6
  30. Gas-Rectifier power supply
  31. How to get more juice out of this shunt regulator
  32. Resistors on DHT Cathode
  33. Noise floor rise on heathkit W4-AMs when power supply transformers were swapped
  34. Help me finish up this SET project (multiple questions / ramblings)
  35. This Is Cool !!
  36. output bias servo
  37. Looking for dual power triodes.
  38. Need advice selecting a 2A3 design
  39. Feedback basics
  40. tubalizer..
  41. The 6b4g
  42. 6N6P Operating Points
  43. Lundahl+EL84 PP+concertina+input stage
  44. Help wanted for a truly loco project. (A Tube--gainclone hybrid guitar amp!)
  45. Looking for circuit of SE amp. for Eimac 100TH
  46. Counterpoint Sa-3000 Circuit Diagram
  47. compressor Faiirchild 670 DIY
  48. How much headroom for a choke---to stop it from humming?
  49. Bay Area Diy Festival
  50. Using Eagle for Tubes designs
  51. Worst that could happen?
  52. Identifying output tx.
  53. Small pre
  54. Cathode follower driver
  55. comment on this B+ supply
  56. ODD TUBES, what to look for?
  57. 2A3 SE and Edcorp tranny
  58. Differential amplifier with 12AX7
  59. Bogen Challenger CH30 Amplifier
  60. do I need to use a heatsink on a DN2540 in a B+ supply?
  61. Transformer, 10K 1:1 - which one?
  62. Where to find Blackgate Caps?
  63. Passive Pre-Amp causes huge power loss?
  64. Rubbish fluorescent tubes: Eterna Lighting (UK), GE (US)
  65. Melos TM90 ST schematic?
  66. My first tube preamplifier:)
  67. Opinions on the Conrad Johnson MV75 amplifier please.
  68. Favorite Tubes
  69. SS replacement for 83 tube ?
  70. AMC CVT 2030 Output Transformer.
  71. 6-ohm speaker to tube amp
  72. What tubes share the pinout with the 5687?
  73. SMPS for B+ discussion
  74. Building a 200W+ bass amp
  75. need help understanding voltage regulator schematic (using CCS) from Raleigh Audio
  76. SS No R No C Power Supply for Tubes
  77. FREDs? Replace 1N4003 rectifier diodes?
  78. Hot running regulated dc filament supply for aikido preamp
  79. B+ TX. overkill?
  80. 33 Power Pentode Design Pointers Needed
  81. What Wiki?
  82. help understanding updated DRD from J Elliano's site (using 6AN4 instead of 6n1p)
  83. Zen SE84TS
  84. 5687 tube
  85. Tube vs. Semiconducter rectification
  86. Bogen CHB35 Mods and Preamp ideas
  87. I Want To Build A 100+Watt per/channel Tube Poweramp
  88. Phonodude problem
  89. enjoythemusic's t-rex amp: where is the +70VDC tap?
  90. Earthing and how it effects sound.
  91. Rectifier question
  92. Help for SE Main Transformer
  93. 6D22S Getter Question
  94. Repair of a McIntosh MC225 power amp
  95. OPA627 with tube buffer....
  96. Bell Stereophonic 3030 help
  97. Choosing the line stage preamp.
  98. I Need Help, Mcintosh/Marantz 7 content
  99. For 45 > 845: selecting an 9.5/ 10 Interstage
  100. How to reduce gain of this Tube Preamplifier ?
  101. looking for pp amp schematic without nfb
  102. Pseudo dual mono PS?
  103. WE404A drive 6L6 solution
  104. Looking for info on loudness control
  105. Tubes and minority carriers
  106. suggestions for 3 projects please
  107. DIY tube preamp kit
  108. M6 lamination: what is it?
  109. why is it that most tube projects uses copper sheetmetal?
  110. Sources in the Philippines / Manila
  111. Tube noise - Help
  112. Strange reverb circuit
  113. Tiny tube amp
  114. DC heating directly heated output valves
  115. Alps 250k in a Pas-3 Question
  116. 1st cap heats up...
  117. RCA VR Tube engineering data
  118. dropping heater voltage
  119. Please Help with Sound Valves M40 Monoblock Bias Adjustment Procedure!!!
  120. Old Sony SE OPT's /w 600r tap... cathode feedback maybe?
  121. Which is the poor man 45 tube?
  122. Audio Note Low Gain Quest Power Amplifier
  123. Quad II: Which resistors?
  124. Designing a preamp with two tubes
  125. ARC Classic 30 problem
  126. Why does the 6AS7 have such high Miller capacitance ?
  127. Driving an unusal Z=1k5-2k input spring reverb w/o tranny
  128. serching 5A6 beam power pentode data/curves/schematics for AF practice amp
  129. HPHV regulator measurement
  130. DHT Topology Comparison Question
  131. Secondary Tap of Power Transformer?
  132. Soft-clipping Circuit/tubecad
  133. lack of bass in a 6h30 design
  134. Difference between two novals
  135. C3g
  136. All Tube Stereo power amplifier
  137. what gas VR tube?
  138. KT88 schematic
  139. Help me understand the topologies here...
  140. Finished my Amp, Need to build a PS
  141. Push-Pull driver stage?
  142. Floating the heaters
  143. Replacing Power Transformer
  144. When car audio & tubes collide...
  145. 6N6P and 6SN7 Operating point suggestions
  146. NOS pF capacitors voltage rating?
  147. Tubes in Vietnam
  148. Passive pre order?
  149. layout help
  150. junkbox amp help
  151. required specs of an input step up transformer, into a 45, to allow it drive an 845
  152. 6as7 SRPP output stage
  153. Bias range and selenium rectifier
  154. OTL's and aircraft transformers
  155. PSE EL34 - valve rectification question
  156. A 2a3 Amplifier
  157. James Transformer BS
  158. Plate Voltage on 12ax7a
  159. Parallel Triodes and Load Lines
  160. Steve Bench OTL
  161. High power P-P EL34/6550/KT88 amp suggestions
  162. Stepped attenuators - break before make?
  163. audionote 144 OPT comment pls...
  164. KT88 and Hammond Transformer Schematics
  165. How do I know that my measured AC voltage is precise?
  166. 6C33B-C push pull with output transformer
  167. EL84 grid voltage?
  168. seperate power supply?
  169. Mysterious tektronix power supply
  170. tube amp subwoofer hum problem
  171. How to test transformer's current rating?
  172. Death/Black Metal sound on Crate 6212
  173. 4654/4699 pentodes
  174. Output tubes on a Marshall JCM900
  175. vacuum tube logic gate
  176. Screen current
  177. Any tube-sleuths out there know who made these Daystrom tubes?
  178. With this meter reading, enough to know Fuse is the culprit?
  179. need comments on amp design
  180. KEF/Celestion speakers for tube use...
  181. Another cheap fix - MOT as plate choke.
  182. XAM Mark II B
  183. How to test voltages on secondaries?
  184. Audio innovation L1 valve replacement
  185. Is this in-rush current?
  186. TETRODE amplifiers
  187. Audio Shop Eifl Corporation
  188. 6sn7 Buffer
  189. Marantz 8b operating voltages
  190. amplifier with 813 valves
  191. Changing plate resistor in live circuitry.
  192. 2xEL34 vs. 4xEL84 vs. 2x6L6 vs. 4x6V6
  193. KT88 drivers
  194. Simple Hybrid SE EL84 UL amp.. comments please.
  195. max input impedance for // el84's and other ?
  196. Please Help.. PCL81
  197. Some troubles with PSUD. A little help please !
  198. Why D getters?
  199. Help me information of the tubes?
  200. Questions about this line stage
  201. 5Z4P rectifier tube question
  202. Need help from Aikido builder
  203. Aikesi_el34҇һ̨
  204. Direct heating triodes are really better?
  205. Audio Reality is back, in digital format
  206. Stoetkit 25W integrated amp
  207. Switchable stages with Tubelabs hybrid MOSFET/ 845 SE amp?
  208. Tube Pre Amplifier for SEWA 7 Watt ClassA MOSFET
  209. Michaelson Audio Odysseus Problem.
  210. ASC metal can polypro caps: ground the metal can to AC ground?
  211. anyone living in australia (hopefully adelaide) willing to lend their puncher/bit?
  212. ReinoutdV
  213. Priboj amp schematic
  214. EL84 in ultra-linear mode
  215. internal shielding
  216. RIAA: what does it stand for?
  217. Socket Mounting Rings
  218. heathkit sa2 - new question
  219. RCA R35, 39 & 57 Terminal Usage...
  220. 45 into an 845 parafeed circuit
  221. Tubes power supply 220 t0 300V ?
  222. ripple values in B+ supply
  223. Capacitors and tubes for AA5?
  224. Dynaco PAS Rebuild
  225. Audio Research SP9 Circuit Diagram HELP!
  226. ARC reference II schematic
  227. 71a Line Stage and Miller Capacitance
  228. Low plate voltage pentode (<40v) for diff pair?
  229. loadlines for newbie.
  230. Measuring approx RMS power O/P
  231. Hybrid Aikido-ish gain stage
  232. Loftin-White coupling Questions
  233. 807 screen regulation
  234. What kills an opt tranny?
  235. EAR529 schematic diagram
  236. World Designs KEL84 Valve Amplifier
  237. what 300B design would you recommend but...
  238. Replacement conductance meter for Hickok 533A
  239. My RIAA Phono Stage Project
  240. A2 Questions
  241. World Audio Design
  242. Seek for your comments/advice to newbie on Tube world
  243. CCSed LTP validity?
  244. Suitability of transmitter tubes for musical amplifiers
  245. Anyone using an 813 in pentode?
  246. Electrolytic in the feedback loop
  247. El34 PP Vs. El34 PSE
  248. RIAA Phono Amp Design
  249. Matching resistors to 1% or Better
  250. Wirewound cathode resistor

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