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View Full Version : Tubes / Valves


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  1. Modifications to Sennheiser VKS 203
  2. Onix SP3 integrated amp latest schematic
  3. Omit sp3 integrated amp latest schematic
  4. Help: Western Electric 102A Tube Datasheet and Test Settings
  5. Power and output transformer separated from amplifier
  6. discrete and simple VCCS
  7. heater wiring question
  8. What is the deal with Welborne Labs?
  9. Center Channel
  10. input stage problem help please!
  11. Tube Tips/Tricks for beginners
  12. Any skilled custom tube amplifier builders out there?
  13. Are these tubes really matched?
  14. Single Ended Amp
  15. Mighty Midget Problems
  16. Run the tube stuff in your car
  17. Jackson 648 test for 6973
  18. Space-charge tetrodes in Inverted Mode
  19. choosing input valve
  20. Rectifier characteristics
  21. Glass-ware?
  22. 5751 Mil spec tubes vrs 12AX7
  23. 47 pentode...fabulous sound !!!!
  24. Aikido preamp transformer question
  25. 40's tube receiver question
  26. W5m transformer
  27. Dual voltage PS filtering.
  28. OD3 150V tube regulator
  29. Fisher 500c
  30. Help with quad cap upgrade
  31. low voltage hybrid power amplifier
  32. Morgan Jones Kapacitors
  33. Which IR LED?
  34. Tube Frequency Response
  35. Big B+ voltage drop using diode rectifier.
  36. Triode ST70 kit schematic?
  37. 6AU6 replacement
  38. IT in cathode for driver class A2 tube
  39. Bogen MX30 Output Transformers
  40. Worlds Most Expensive Tube Amp !!!
  41. Blown screen resistor
  42. Blown screen resistor
  43. To ground plane or not?
  44. 5Z4PA Alternative?
  45. Question about chassis ground
  46. 6337- wtf is it?
  47. need ideers for a 6 channel amp
  48. sv572 transformer headache
  49. 6C33C / 6EM7
  50. 6146 TUBES ?
  51. Impedance matching
  52. QRP03 - Tube Buffered Gainclone
  53. Amp Cage Fababricators?
  54. PP KT88, Need help!
  55. Question regarding rectifier tube replacement
  56. Harmon Kardon A500
  57. Double triode 6SN7
  58. Tank's DIY tube preamp
  59. C core OPT for PP EL84
  60. amp diagram for KT88 and 300B on the same circuit
  61. Yaqin MS 34 D
  62. Tube buffer for amplifier with LM1875
  63. What is the best ?
  64. Fender DRRI tone
  65. DUKANE tube PA help
  66. Old tube? HELP RSE NP-7V-12 168810
  67. My first tube power amp
  68. Another mystery tube:
  69. Quad 22 Wiring
  70. Radford phase splitter again
  71. hookup wire source
  72. MCU adjustable fixed bias
  73. vr tube / glow tube as filter?
  74. Using phono stage only of preamp
  75. Correct settings for EBL21 and other tube on Hickok 539C
  76. Decca Portable Record Player model DPS8 Filter cap replacment
  77. 6V6 vs EL84 for output
  78. Realistic HK 210/Acrosound Stereo 120 Amp Schmatic/Manual Needed
  79. 2A3 with 12AT7
  80. Voltage rating of plate gyrator MOSFET
  81. Quad22 like preamplifier kit
  82. Push-pull implemented with KT88
  83. My QUAD 2 Restoration
  84. DIY High Power Car Tube Amp
  85. Perished insulation on transformer secondary - seems shorted. What can I do here?
  86. Need advice and help with new build
  87. Suggestions for a cheap Stereo Phono tube preamp based upon this power transformer?
  88. Determining imput impedence of a preamp line stage
  89. Newb question on 12AU7 gain stage
  90. Valve Preamplifier Help
  91. OPT choices - 6L6 PPP
  92. MESA STRATEGY 400
  93. Shuguang, Beijing or Shanghai EL84 ?
  94. CJ PV-5 tubes
  95. Reference tube amp kit, <20 watts for under $1,000?
  96. ccs power supply 310a
  97. At what point does it become a "hybrid" ?
  98. Line filters
  99. Step-up MC transformer for Audio Research SP 6C
  100. Psud help.
  101. MC Step-Up OTL Stage (grounded-grid) for MM RIAA Head Amps
  102. Repurposing heathkit s-2 electronic switch
  103. output cap bypass?
  104. 6e5p & 6c41 tube amplifier
  105. Looking for my first tube amp...
  106. Acceptable variance in plate voltage?
  107. SRPP bias calculation
  108. 6A3 test, what am I doing wrong?
  109. Goldline Phono Tube Pre Amp PCB - Analog Metric
  110. New Copper Nanoparticle Solder - Breakthrough?
  111. SRPP as a final stage? What do you think?
  112. Troughline Transmissionline theory explanation needed
  113. Help with odd bias method on Crown tube amp
  114. preamp output impedance matching
  115. KT66 Woes
  116. Help with Calibration: Hickok Western Electric KS-15750-L1 Tubes Tester
  117. Cascode driver
  118. 2a3 DC coupled
  119. ECF/PCF 200, 201 B10B 10Pin Tubes
  120. Homemade EL84 Push-Pull amp doesn't work
  121. Tamradio Transformer
  122. Variable HF oscilator
  123. eico st70 dimming house lights and slowing turntable`
  124. Amplifier Calculators
  125. Are any of these tubes useful for audio
  126. Modifying a J Sound Lab 2A3 amplifier
  127. Experimentation - Power transformer as output
  128. Mullard with ECC99 Phase Splitter
  129. Killed an Edcor OPT. How?
  130. Silvertone 1482 Fuse Troubleshooter help
  131. If it ain't broke....
  132. Silly DHT question VaMax
  133. Recommendations for preamps with PCC88
  134. 6h23n same as 6n23p
  135. Mighty Midget Amplifier and speaker requirements.
  136. Bias Supply protection
  137. Tube Amp Schematics
  138. POWER TRANSFORMER IDENTIFICATION NEEDED "26R90"
  139. 6sn7 driving Push Pull Parallel kt88's?
  140. help with an old Peak ST-100 - single ended 6GW8
  141. Designing an 801 SET Class A2 Amp
  142. Grid choke considerations for 300b
  143. SE poweramp with best bass performance
  144. 45 Tube IN SET Amp
  145. what will happen?
  146. ECL86 PP Amp - Very low frequency clicking
  147. motor run cap question
  148. Power Switch/Indicator Lamp Mod to S-5 Electronics K-501
  149. EL34 SET With No Driver Tube?
  150. Filter capacitors - motor run?
  151. Microwave transformers
  152. Capacitors in the cathode of preamp tubes
  153. How Many Tubes to a Rackspace?
  154. selenium diodes
  155. Is it possible to Oversize an SE OPT?
  156. questions about my ecc83 phono pre build
  157. PSU resistor temperature
  158. QE08-200
  159. Adding heater transformer to my 6b4g amp. help a noob please.
  160. Bogen CHB-35a Troubleshooting: Distortion, Power Tubes Very Hot
  161. Big Cap in luxman MB3045
  162. Question about 4x12 cabinet wiring
  163. What happened to Sakuma-san's website ?
  164. Should I ???
  165. Can you classify condition of tubes?
  166. Help: Hickok Western Electric KS-15750-L1 Tubes Tester Maintenance and Calibration
  167. ecc99 preamp into an amp
  168. AI 500 Volume pot advice wanted.
  169. eico st70 input impedance question
  170. Tube Preamp or Power Amp?
  171. pmillett "Engineer's Amplifier" to mono?
  172. Advice/schematics wanted for HF-81 opt project
  173. 7591 tube, can't find that number on tester.
  174. valve upgrade
  175. has anyone known about Ming Da amplifiers
  176. A nice little valve amplifier
  177. Use rectifier winding for 6.3V DC heater?
  178. Voltage Regulators Zener / Gas Reg
  179. Looking for first tube amp kit.
  180. Which choke is better ?
  181. UK input voltage question
  182. 1sh29b
  183. 6G2 amp - volume and tone play up on one input only
  184. One channel grainy sound
  185. anybody know 6BY5 plate resistance ?
  186. SE 6550
  187. Yaqin MC-100b Volume pot
  188. Pair of possible MC step ups - octal mount
  189. My Mighty Midget
  190. Conrad Johnson MV75 "update circuit drawing"
  191. Cheap Red LED bias on ecc83/12ax7
  192. stoneAmp
  193. Project thread: KT88 PP amp
  194. I need the voltages or schematic for a Magnavox 177.55 amp
  195. Different PSE output designs - which to use?
  196. Toroidal (adding a winding)
  197. Kondo Souga - audition
  198. Electrocube Polyestyrene caps
  199. a incar tube/valve line driver
  200. Before I punch the holes.. A quartet of EL84?
  201. Tubes Home Theater 4+1
  202. DAC direct out, not enough gain, help me build a driving stage.
  203. ultra linear aikido with linearizing pentode
  204. Scott 299
  205. OPTs With Multiple Secondaries
  206. Over Four Tons Of Tubes
  207. L channel lower output?
  208. 16LS Amp by S5 Electronics Questions
  209. Heathkit WM-5
  210. 6BL8 not on roll chart
  211. CJ PV-5 PS rebuild
  212. Attenuator for passive pre (LEAK ST 20)
  213. Help ID tubes Plz
  214. Data sheet and load line question
  215. Trouble with Silver to Black face twin mod.
  216. Grommes S35 booster amp output?
  217. dc filament heater - high impedance const. voltage
  218. Schematic for Modwright SWL 9.0se Preamp
  219. GZ37 substitutes
  220. output attenuation
  221. My humming home made tube amp
  222. Shared Cathodes 300b
  223. Bogen CHB-35 for Music...
  224. correctly connecting PT for 110/220 volts
  225. voltage divider
  226. "Bypass caps" and their effect on perceived sound
  227. Repair of Cayin HA-2 Tube Headphone Amp
  228. Best Drive for EL34
  229. Needing Schematic for Grommes LJ7 please.
  230. 6550C v. KT88
  231. ECC81 MU-Follower consumption
  232. Locating hum source
  233. c3g self oscillation problem - a newbie needs help!
  234. Voice of music console help
  235. One tube radio
  236. Triodes with better "look&feel"
  237. HV Supply
  238. Will this arrangement impact the input impedence of the cathode follower?
  239. Measuring preamp output impedance
  240. Capacitor from 120VAC to ground
  241. I have power but no sound???
  242. Using a function generator with a tube amp?
  243. What resistors to use on KT88s tubes?
  244. Opinions on Raysonic sp-200 + Raysonic 168 CD
  245. Lab power supply for testing tubes
  246. Could really use some help here!
  247. Help~ GU50 ?
  248. Some Power Supply Help
  249. newbies beware of lampizator srpp pdf
  250. Headphone output

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