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

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