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View Full Version : Tubes / Valves

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  1. Using Eagle for Tubes designs
  2. Worst that could happen?
  3. Identifying output tx.
  4. Small pre
  5. Cathode follower driver
  6. comment on this B+ supply
  7. ODD TUBES, what to look for?
  8. 2A3 SE and Edcorp tranny
  9. Differential amplifier with 12AX7
  10. Bogen Challenger CH30 Amplifier
  11. do I need to use a heatsink on a DN2540 in a B+ supply?
  12. Transformer, 10K 1:1 - which one?
  13. Where to find Blackgate Caps?
  14. Passive Pre-Amp causes huge power loss?
  15. Rubbish fluorescent tubes: Eterna Lighting (UK), GE (US)
  16. Melos TM90 ST schematic?
  17. My first tube preamplifier:)
  18. Opinions on the Conrad Johnson MV75 amplifier please.
  19. Favorite Tubes
  20. SS replacement for 83 tube ?
  21. AMC CVT 2030 Output Transformer.
  22. 6-ohm speaker to tube amp
  23. What tubes share the pinout with the 5687?
  24. SMPS for B+ discussion
  25. Building a 200W+ bass amp
  26. need help understanding voltage regulator schematic (using CCS) from Raleigh Audio
  27. SS No R No C Power Supply for Tubes
  28. FREDs? Replace 1N4003 rectifier diodes?
  29. Hot running regulated dc filament supply for aikido preamp
  30. B+ TX. overkill?
  31. 33 Power Pentode Design Pointers Needed
  32. What Wiki?
  33. help understanding updated DRD from J Elliano's site (using 6AN4 instead of 6n1p)
  34. Zen SE84TS
  35. 5687 tube
  36. Tube vs. Semiconducter rectification
  37. Bogen CHB35 Mods and Preamp ideas
  38. I Want To Build A 100+Watt per/channel Tube Poweramp
  39. Phonodude problem
  40. enjoythemusic's t-rex amp: where is the +70VDC tap?
  41. Earthing and how it effects sound.
  42. Rectifier question
  43. Help for SE Main Transformer
  44. 6D22S Getter Question
  45. Repair of a McIntosh MC225 power amp
  46. OPA627 with tube buffer....
  47. Bell Stereophonic 3030 help
  48. Choosing the line stage preamp.
  49. I Need Help, Mcintosh/Marantz 7 content
  50. For 45 > 845: selecting an 9.5/ 10 Interstage
  51. How to reduce gain of this Tube Preamplifier ?
  52. looking for pp amp schematic without nfb
  53. Pseudo dual mono PS?
  54. WE404A drive 6L6 solution
  55. Looking for info on loudness control
  56. Tubes and minority carriers
  57. suggestions for 3 projects please
  58. DIY tube preamp kit
  59. M6 lamination: what is it?
  60. why is it that most tube projects uses copper sheetmetal?
  61. Sources in the Philippines / Manila
  62. Tube noise - Help
  63. Strange reverb circuit
  64. Tiny tube amp
  65. DC heating directly heated output valves
  66. Alps 250k in a Pas-3 Question
  67. 1st cap heats up...
  68. RCA VR Tube engineering data
  69. dropping heater voltage
  70. Please Help with Sound Valves M40 Monoblock Bias Adjustment Procedure!!!
  71. Old Sony SE OPT's /w 600r tap... cathode feedback maybe?
  72. Which is the poor man 45 tube?
  73. Audio Note Low Gain Quest Power Amplifier
  74. Quad II: Which resistors?
  75. Designing a preamp with two tubes
  76. ARC Classic 30 problem
  77. Why does the 6AS7 have such high Miller capacitance ?
  78. Driving an unusal Z=1k5-2k input spring reverb w/o tranny
  79. serching 5A6 beam power pentode data/curves/schematics for AF practice amp
  80. HPHV regulator measurement
  81. DHT Topology Comparison Question
  82. Secondary Tap of Power Transformer?
  83. Soft-clipping Circuit/tubecad
  84. lack of bass in a 6h30 design
  85. Difference between two novals
  86. C3g
  87. All Tube Stereo power amplifier
  88. what gas VR tube?
  89. KT88 schematic
  90. Help me understand the topologies here...
  91. Finished my Amp, Need to build a PS
  92. Push-Pull driver stage?
  93. Floating the heaters
  94. Replacing Power Transformer
  95. When car audio & tubes collide...
  96. 6N6P and 6SN7 Operating point suggestions
  97. NOS pF capacitors voltage rating?
  98. Tubes in Vietnam
  99. Passive pre order?
  100. layout help
  101. junkbox amp help
  102. required specs of an input step up transformer, into a 45, to allow it drive an 845
  103. 6as7 SRPP output stage
  104. Bias range and selenium rectifier
  105. OTL's and aircraft transformers
  106. PSE EL34 - valve rectification question
  107. A 2a3 Amplifier
  108. James Transformer BS
  109. Plate Voltage on 12ax7a
  110. Parallel Triodes and Load Lines
  111. Steve Bench OTL
  112. High power P-P EL34/6550/KT88 amp suggestions
  113. Stepped attenuators - break before make?
  114. audionote 144 OPT comment pls...
  115. KT88 and Hammond Transformer Schematics
  116. How do I know that my measured AC voltage is precise?
  117. 6C33B-C push pull with output transformer
  118. EL84 grid voltage?
  119. seperate power supply?
  120. Mysterious tektronix power supply
  121. tube amp subwoofer hum problem
  122. How to test transformer's current rating?
  123. Death/Black Metal sound on Crate 6212
  124. 4654/4699 pentodes
  125. Output tubes on a Marshall JCM900
  126. vacuum tube logic gate
  127. Screen current
  128. Any tube-sleuths out there know who made these Daystrom tubes?
  129. With this meter reading, enough to know Fuse is the culprit?
  130. need comments on amp design
  131. KEF/Celestion speakers for tube use...
  132. Another cheap fix - MOT as plate choke.
  133. XAM Mark II B
  134. How to test voltages on secondaries?
  135. Audio innovation L1 valve replacement
  136. Is this in-rush current?
  137. TETRODE amplifiers
  138. Audio Shop Eifl Corporation
  139. 6sn7 Buffer
  140. Marantz 8b operating voltages
  141. amplifier with 813 valves
  142. Changing plate resistor in live circuitry.
  143. 2xEL34 vs. 4xEL84 vs. 2x6L6 vs. 4x6V6
  144. KT88 drivers
  145. Simple Hybrid SE EL84 UL amp.. comments please.
  146. max input impedance for // el84's and other ?
  147. Please Help.. PCL81
  148. Some troubles with PSUD. A little help please !
  149. Why D getters?
  150. Help me information of the tubes?
  151. Questions about this line stage
  152. 5Z4P rectifier tube question
  153. Need help from Aikido builder
  154. Aikesi賍机el34尋找國外代理，可以送一台！！
  155. Direct heating triodes are really better?
  156. Audio Reality is back, in digital format
  157. Stoetkit 25W integrated amp
  158. Switchable stages with Tubelab抯 hybrid MOSFET/ 845 SE amp?
  159. Tube Pre Amplifier for SEWA 7 Watt ClassA MOSFET
  160. Michaelson Audio Odysseus Problem.
  161. ASC metal can polypro caps: ground the metal can to AC ground?
  162. anyone living in australia (hopefully adelaide) willing to lend their puncher/bit?
  163. ReinoutdV
  164. Priboj amp schematic
  165. EL84 in ultra-linear mode
  166. internal shielding
  167. RIAA: what does it stand for?
  168. Socket Mounting Rings
  169. heathkit sa2 - new question
  170. RCA R35, 39 & 57 Terminal Usage...
  171. 45 into an 845 parafeed circuit
  172. Tubes power supply 220 t0 300V ?
  173. ripple values in B+ supply
  174. Capacitors and tubes for AA5?
  175. Dynaco PAS Rebuild
  176. Audio Research SP9 Circuit Diagram HELP!
  177. ARC reference II schematic
  178. 71a Line Stage and Miller Capacitance
  179. Low plate voltage pentode (<40v) for diff pair?
  180. loadlines for newbie.
  181. Measuring approx RMS power O/P
  182. Hybrid Aikido-ish gain stage
  183. Loftin-White coupling Questions
  184. 807 screen regulation
  185. What kills an opt tranny?
  186. EAR529 schematic diagram
  187. World Designs KEL84 Valve Amplifier
  188. what 300B design would you recommend but...
  189. Replacement conductance meter for Hickok 533A
  190. My RIAA Phono Stage Project
  191. A2 Questions
  192. World Audio Design
  193. Seek for your comments/advice to newbie on Tube world
  194. CCSed LTP validity?
  195. Suitability of transmitter tubes for musical amplifiers
  196. Anyone using an 813 in pentode?
  197. Electrolytic in the feedback loop
  198. El34 PP Vs. El34 PSE
  199. RIAA Phono Amp Design
  200. Matching resistors to 1% or Better
  201. Wirewound cathode resistor
  202. Tube Hybrid Amp.
  203. Nasty ground loop
  204. ECC88 Class B
  205. Cree diodes
  206. Old Tube Amp Servicer In Nj???
  207. Vg-k max
  208. Anyone used PT15 / VT104 ?
  209. rebuild a Musical Fidelity X-10D ??
  210. Transformer Building
  211. Identifying weird signal transformer
  212. 100watt mono blocks
  213. Resistor combination calculator - RESCALC
  214. Aikido choice of valves (or tubes, if you will)
  215. Pin 9 on 6n6P, 6H30, etc
  216. Croft Super Micro meets Acoustat TNT200
  217. tube mic preamp kit??
  218. The SACD Meets Tubes
  219. Useful Abbreviations
  220. cap value for 6X4 rectifier?
  221. One B+ for the both driver and output tube if they are identical?
  222. Fisher 500B Schematic Question
  223. SE Output Transfromers Question
  224. Amplifier Project
  225. Grid Stopper for parallel sides of dual triode
  226. centre tap or floating heaters?
  227. Converting 6.3V to 6.3VCT Quick questions
  228. Russian Nuvistors...Anyone tried them?
  229. 一台300bc胆机，大家给点意见，谢谢
  230. Australian Amp Manufacturers
  231. Old radio quick question re PS
  232. Kt90 Pse
  233. Velleman K4040 is Always Blowing Output Tubes
  234. looking for transformer with the following specs?
  235. 5686 amplifier schematic
  236. Heaters for cathodes with a large swing
  237. 6DJ8 as phase splitter.
  238. New driver for SE 2A3
  239. I磛e made a Mu stage with 6888 and 6C45...
  240. Quick urgent Help plz !
  241. Cheap SET Kit for UK
  242. How can I change bias 6H30pi tube
  243. DHT heater voltage
  244. Ok SY...You Win
  245. Input level required- PP KT88
  246. SE 6C33C-B ; preview of a new Baby
  247. 2A3 grid DC voltage
  248. Dyna ST70 experience bypassing input tubes
  249. [Theory] Amplifier efficiency
  250. Pentode Cascode CCS