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  1. DC heating directly heated output valves
  2. Alps 250k in a Pas-3 Question
  3. 1st cap heats up...
  4. RCA VR Tube engineering data
  5. dropping heater voltage
  6. Please Help with Sound Valves M40 Monoblock Bias Adjustment Procedure!!!
  7. Old Sony SE OPT's /w 600r tap... cathode feedback maybe?
  8. Which is the poor man 45 tube?
  9. Audio Note Low Gain Quest Power Amplifier
  10. Quad II: Which resistors?
  11. Designing a preamp with two tubes
  12. ARC Classic 30 problem
  13. Why does the 6AS7 have such high Miller capacitance ?
  14. Driving an unusal Z=1k5-2k input spring reverb w/o tranny
  15. serching 5A6 beam power pentode data/curves/schematics for AF practice amp
  16. HPHV regulator measurement
  17. DHT Topology Comparison Question
  18. Secondary Tap of Power Transformer?
  19. Soft-clipping Circuit/tubecad
  20. lack of bass in a 6h30 design
  21. Difference between two novals
  22. C3g
  23. All Tube Stereo power amplifier
  24. what gas VR tube?
  25. KT88 schematic
  26. Help me understand the topologies here...
  27. Finished my Amp, Need to build a PS
  28. Push-Pull driver stage?
  29. Floating the heaters
  30. Replacing Power Transformer
  31. When car audio & tubes collide...
  32. 6N6P and 6SN7 Operating point suggestions
  33. NOS pF capacitors voltage rating?
  34. Tubes in Vietnam
  35. Passive pre order?
  36. layout help
  37. junkbox amp help
  38. required specs of an input step up transformer, into a 45, to allow it drive an 845
  39. 6as7 SRPP output stage
  40. Bias range and selenium rectifier
  41. OTL's and aircraft transformers
  42. PSE EL34 - valve rectification question
  43. A 2a3 Amplifier
  44. James Transformer BS
  45. Plate Voltage on 12ax7a
  46. Parallel Triodes and Load Lines
  47. Steve Bench OTL
  48. High power P-P EL34/6550/KT88 amp suggestions
  49. Stepped attenuators - break before make?
  50. audionote 144 OPT comment pls...
  51. KT88 and Hammond Transformer Schematics
  52. How do I know that my measured AC voltage is precise?
  53. 6C33B-C push pull with output transformer
  54. EL84 grid voltage?
  55. seperate power supply?
  56. Mysterious tektronix power supply
  57. tube amp subwoofer hum problem
  58. How to test transformer's current rating?
  59. Death/Black Metal sound on Crate 6212
  60. 4654/4699 pentodes
  61. Output tubes on a Marshall JCM900
  62. vacuum tube logic gate
  63. Screen current
  64. Any tube-sleuths out there know who made these Daystrom tubes?
  65. With this meter reading, enough to know Fuse is the culprit?
  66. need comments on amp design
  67. KEF/Celestion speakers for tube use...
  68. Another cheap fix - MOT as plate choke.
  69. XAM Mark II B
  70. How to test voltages on secondaries?
  71. Audio innovation L1 valve replacement
  72. Is this in-rush current?
  73. TETRODE amplifiers
  74. Audio Shop Eifl Corporation
  75. 6sn7 Buffer
  76. Marantz 8b operating voltages
  77. amplifier with 813 valves
  78. Changing plate resistor in live circuitry.
  79. 2xEL34 vs. 4xEL84 vs. 2x6L6 vs. 4x6V6
  80. KT88 drivers
  81. Simple Hybrid SE EL84 UL amp.. comments please.
  82. max input impedance for // el84's and other ?
  83. Please Help.. PCL81
  84. Some troubles with PSUD. A little help please !
  85. Why D getters?
  86. Help me information of the tubes?
  87. Questions about this line stage
  88. 5Z4P rectifier tube question
  89. Need help from Aikido builder
  90. Aikesi賍机el34尋找國外代理,可以送一台!!
  91. Direct heating triodes are really better?
  92. Audio Reality is back, in digital format
  93. Stoetkit 25W integrated amp
  94. Switchable stages with Tubelab抯 hybrid MOSFET/ 845 SE amp?
  95. Tube Pre Amplifier for SEWA 7 Watt ClassA MOSFET
  96. Michaelson Audio Odysseus Problem.
  97. ASC metal can polypro caps: ground the metal can to AC ground?
  98. anyone living in australia (hopefully adelaide) willing to lend their puncher/bit?
  99. ReinoutdV
  100. Priboj amp schematic
  101. EL84 in ultra-linear mode
  102. internal shielding
  103. RIAA: what does it stand for?
  104. Socket Mounting Rings
  105. heathkit sa2 - new question
  106. RCA R35, 39 & 57 Terminal Usage...
  107. 45 into an 845 parafeed circuit
  108. Tubes power supply 220 t0 300V ?
  109. ripple values in B+ supply
  110. Capacitors and tubes for AA5?
  111. Dynaco PAS Rebuild
  112. Audio Research SP9 Circuit Diagram HELP!
  113. ARC reference II schematic
  114. 71a Line Stage and Miller Capacitance
  115. Low plate voltage pentode (<40v) for diff pair?
  116. loadlines for newbie.
  117. Measuring approx RMS power O/P
  118. Hybrid Aikido-ish gain stage
  119. Loftin-White coupling Questions
  120. 807 screen regulation
  121. What kills an opt tranny?
  122. EAR529 schematic diagram
  123. World Designs KEL84 Valve Amplifier
  124. what 300B design would you recommend but...
  125. Replacement conductance meter for Hickok 533A
  126. My RIAA Phono Stage Project
  127. A2 Questions
  128. World Audio Design
  129. Seek for your comments/advice to newbie on Tube world
  130. CCSed LTP validity?
  131. Suitability of transmitter tubes for musical amplifiers
  132. Anyone using an 813 in pentode?
  133. Electrolytic in the feedback loop
  134. El34 PP Vs. El34 PSE
  135. RIAA Phono Amp Design
  136. Matching resistors to 1% or Better
  137. Wirewound cathode resistor
  138. Tube Hybrid Amp.
  139. Nasty ground loop
  140. ECC88 Class B
  141. Cree diodes
  142. Old Tube Amp Servicer In Nj???
  143. Vg-k max
  144. Anyone used PT15 / VT104 ?
  145. rebuild a Musical Fidelity X-10D ??
  146. Transformer Building
  147. Identifying weird signal transformer
  148. 100watt mono blocks
  149. Resistor combination calculator - RESCALC
  150. Aikido choice of valves (or tubes, if you will)
  151. Pin 9 on 6n6P, 6H30, etc
  152. Croft Super Micro meets Acoustat TNT200
  153. tube mic preamp kit??
  154. The SACD Meets Tubes
  155. Useful Abbreviations
  156. cap value for 6X4 rectifier?
  157. One B+ for the both driver and output tube if they are identical?
  158. Fisher 500B Schematic Question
  159. SE Output Transfromers Question
  160. Amplifier Project
  161. Grid Stopper for parallel sides of dual triode
  162. centre tap or floating heaters?
  163. Converting 6.3V to 6.3VCT Quick questions
  164. Russian Nuvistors...Anyone tried them?
  165. 一台300bc胆机,大家给点意见,谢谢
  166. Australian Amp Manufacturers
  167. Old radio quick question re PS
  168. Kt90 Pse
  169. Velleman K4040 is Always Blowing Output Tubes
  170. looking for transformer with the following specs?
  171. 5686 amplifier schematic
  172. Heaters for cathodes with a large swing
  173. 6DJ8 as phase splitter.
  174. New driver for SE 2A3
  175. I磛e made a Mu stage with 6888 and 6C45...
  176. Quick urgent Help plz !
  177. Cheap SET Kit for UK
  178. How can I change bias 6H30pi tube
  179. DHT heater voltage
  180. Ok SY...You Win
  181. Input level required- PP KT88
  182. SE 6C33C-B ; preview of a new Baby
  183. 2A3 grid DC voltage
  184. Dyna ST70 experience bypassing input tubes
  185. [Theory] Amplifier efficiency
  186. Pentode Cascode CCS
  187. Noval Relay
  188. Where to buy 6A5G ?
  189. AC or grounded DC for heater?
  190. EM84 based VUmeter "lines" don't go to zero
  191. 'scoping tube amps
  192. Preferred operating points of small signal triodes
  193. Is the Nuvistor Better Than The 12B4 For A Line Stage
  194. audio research schematics
  195. Looking to put the entire (last edition) RCA and Sylvania books online
  196. 5693 as a phono preamp?
  197. Audible Illusions Dual Mono Preamplifier
  198. should the filaments be already hot before the B+ is applied or
  199. One Electron vs. Transcendar
  200. &quot;Y&quot; caps? current bleed?
  201. I made a 200W tube amp!
  202. Power amp kit for a complete newbie
  203. Confused, datasheet of 417A/5842
  204. Audio Amp Project
  205. Tube tester settings?
  206. Neutrik XLR for Umbilical
  207. Primary Impedance
  208. Need help for HV section Design
  209. power amp kit recommendations
  210. 6N6P vs 5687
  211. Triode spice models for Circuit maker
  212. My ARC D70 get trouble
  213. when using PSUD2, do you...
  214. Depression... and a plea for help!!!
  215. Weston 981 Type 3 schematic and parts list needed
  216. 3W 6C33B-C SE OTL schematics ready
  217. Batory tubes, anyone familiar with these?
  218. Musical Pre-amp topology needed. Interstages please apply!
  219. Tube power Amp matching with SAE Mark M pre amp and AR18 speaker or MS 25i
  220. PowerDrive Circuit for 805 (+ve grid bias)
  221. Alternate spice models
  222. Is this heater supply OK?
  223. Basic RC Value Question
  224. Hookup powersubwoofer to a tube receiver.
  225. Transformer question RE; connections on phono stage
  226. Rectifier Tubes Data - Quick Sheet
  227. Now This is A Tube Guitar Amp!!
  228. Which cabling to use?
  229. Need 396A/6N3P/2C51/407A spice model
  230. Antek Toroidal Power Transformers
  231. HT stands for???
  232. Is it possible to hook up 6c33 plate in parallel
  233. Help eliminating hum
  234. Tube LTP CCS?
  235. Trancsendar Transformers
  236. Hafler/Keroes 6L6 UL
  237. hum
  238. Leads for ISCO PS?
  239. Negative Feedback Bogen CHB100
  240. TubeCad's Hybrid amp question
  241. Cathode bias resistor value for 6SN7?
  242. El84 2-Channel Mono Blocks
  243. Tube Design Books
  244. Interesting Williamson article..
  245. Locating Preamp Output Transformers
  246. Plate characteristics
  247. How do you finance A Great DIY Audio Amp?
  248. 808 Se
  249. Parafeed doubt
  250. A little research: old tube amps from the past

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