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  1. Tube Frequency Response
  2. Big B+ voltage drop using diode rectifier.
  3. Triode ST70 kit schematic?
  4. 6AU6 replacement
  5. IT in cathode for driver class A2 tube
  6. Bogen MX30 Output Transformers
  7. Worlds Most Expensive Tube Amp !!!
  8. Blown screen resistor
  9. Blown screen resistor
  10. To ground plane or not?
  11. 5Z4PA Alternative?
  12. Question about chassis ground
  13. 6337- wtf is it?
  14. need ideers for a 6 channel amp
  15. sv572 transformer headache
  16. 6C33C / 6EM7
  17. 6146 TUBES ?
  18. Impedance matching
  19. QRP03 - Tube Buffered Gainclone
  20. Amp Cage Fababricators?
  21. PP KT88, Need help!
  22. Question regarding rectifier tube replacement
  23. Harmon Kardon A500
  24. Double triode 6SN7
  25. Tank's DIY tube preamp
  26. C core OPT for PP EL84
  27. amp diagram for KT88 and 300B on the same circuit
  28. Yaqin MS 34 D
  29. Tube buffer for amplifier with LM1875
  30. What is the best ?
  31. Fender DRRI tone
  32. DUKANE tube PA help
  33. Old tube? HELP RSE NP-7V-12 168810
  34. My first tube power amp
  35. Another mystery tube:
  36. Quad 22 Wiring
  37. Radford phase splitter again
  38. hookup wire source
  39. MCU adjustable fixed bias
  40. vr tube / glow tube as filter?
  41. Using phono stage only of preamp
  42. Correct settings for EBL21 and other tube on Hickok 539C
  43. Decca Portable Record Player model DPS8 Filter cap replacment
  44. 6V6 vs EL84 for output
  45. Realistic HK 210/Acrosound Stereo 120 Amp Schmatic/Manual Needed
  46. 2A3 with 12AT7
  47. Voltage rating of plate gyrator MOSFET
  48. Quad22 like preamplifier kit
  49. Push-pull implemented with KT88
  50. My QUAD 2 Restoration
  51. DIY High Power Car Tube Amp
  52. Perished insulation on transformer secondary - seems shorted. What can I do here?
  53. Need advice and help with new build
  54. Suggestions for a cheap Stereo Phono tube preamp based upon this power transformer?
  55. Determining imput impedence of a preamp line stage
  56. Newb question on 12AU7 gain stage
  57. Valve Preamplifier Help
  58. OPT choices - 6L6 PPP
  59. MESA STRATEGY 400
  60. Shuguang, Beijing or Shanghai EL84 ?
  61. CJ PV-5 tubes
  62. Reference tube amp kit, <20 watts for under $1,000?
  63. ccs power supply 310a
  64. At what point does it become a "hybrid" ?
  65. Line filters
  66. Step-up MC transformer for Audio Research SP 6C
  67. Psud help.
  68. MC Step-Up OTL Stage (grounded-grid) for MM RIAA Head Amps
  69. Repurposing heathkit s-2 electronic switch
  70. output cap bypass?
  71. 6e5p & 6c41 tube amplifier
  72. Looking for my first tube amp...
  73. Acceptable variance in plate voltage?
  74. SRPP bias calculation
  75. 6A3 test, what am I doing wrong?
  76. Goldline Phono Tube Pre Amp PCB - Analog Metric
  77. New Copper Nanoparticle Solder - Breakthrough?
  78. SRPP as a final stage? What do you think?
  79. Troughline Transmissionline theory explanation needed
  80. Help with odd bias method on Crown tube amp
  81. preamp output impedance matching
  82. KT66 Woes
  83. Help with Calibration: Hickok Western Electric KS-15750-L1 Tubes Tester
  84. Cascode driver
  85. 2a3 DC coupled
  86. ECF/PCF 200, 201 B10B 10Pin Tubes
  87. Homemade EL84 Push-Pull amp doesn't work
  88. Tamradio Transformer
  89. Variable HF oscilator
  90. eico st70 dimming house lights and slowing turntable`
  91. Amplifier Calculators
  92. Are any of these tubes useful for audio
  93. Modifying a J Sound Lab 2A3 amplifier
  94. Experimentation - Power transformer as output
  95. Mullard with ECC99 Phase Splitter
  96. Killed an Edcor OPT. How?
  97. Silvertone 1482 Fuse Troubleshooter help
  98. If it ain't broke....
  99. Silly DHT question VaMax
  100. Recommendations for preamps with PCC88
  101. 6h23n same as 6n23p
  102. Mighty Midget Amplifier and speaker requirements.
  103. Bias Supply protection
  104. Tube Amp Schematics
  105. POWER TRANSFORMER IDENTIFICATION NEEDED "26R90"
  106. 6sn7 driving Push Pull Parallel kt88's?
  107. help with an old Peak ST-100 - single ended 6GW8
  108. Designing an 801 SET Class A2 Amp
  109. Grid choke considerations for 300b
  110. SE poweramp with best bass performance
  111. 45 Tube IN SET Amp
  112. what will happen?
  113. ECL86 PP Amp - Very low frequency clicking
  114. motor run cap question
  115. Power Switch/Indicator Lamp Mod to S-5 Electronics K-501
  116. EL34 SET With No Driver Tube?
  117. Filter capacitors - motor run?
  118. Microwave transformers
  119. Capacitors in the cathode of preamp tubes
  120. How Many Tubes to a Rackspace?
  121. selenium diodes
  122. Is it possible to Oversize an SE OPT?
  123. questions about my ecc83 phono pre build
  124. PSU resistor temperature
  125. QE08-200
  126. Adding heater transformer to my 6b4g amp. help a noob please.
  127. Bogen CHB-35a Troubleshooting: Distortion, Power Tubes Very Hot
  128. Big Cap in luxman MB3045
  129. Question about 4x12 cabinet wiring
  130. What happened to Sakuma-san's website ?
  131. Should I ???
  132. Can you classify condition of tubes?
  133. Help: Hickok Western Electric KS-15750-L1 Tubes Tester Maintenance and Calibration
  134. ecc99 preamp into an amp
  135. AI 500 Volume pot advice wanted.
  136. eico st70 input impedance question
  137. Tube Preamp or Power Amp?
  138. pmillett "Engineer's Amplifier" to mono?
  139. Advice/schematics wanted for HF-81 opt project
  140. 7591 tube, can't find that number on tester.
  141. valve upgrade
  142. has anyone known about Ming Da amplifiers
  143. A nice little valve amplifier
  144. Use rectifier winding for 6.3V DC heater?
  145. Voltage Regulators Zener / Gas Reg
  146. Looking for first tube amp kit.
  147. Which choke is better ?
  148. UK input voltage question
  149. 1sh29b
  150. 6G2 amp - volume and tone play up on one input only
  151. One channel grainy sound
  152. anybody know 6BY5 plate resistance ?
  153. SE 6550
  154. Yaqin MC-100b Volume pot
  155. Pair of possible MC step ups - octal mount
  156. My Mighty Midget
  157. Conrad Johnson MV75 "update circuit drawing"
  158. Cheap Red LED bias on ecc83/12ax7
  159. stoneAmp
  160. Project thread: KT88 PP amp
  161. I need the voltages or schematic for a Magnavox 177.55 amp
  162. Different PSE output designs - which to use?
  163. Toroidal (adding a winding)
  164. Kondo Souga - audition
  165. Electrocube Polyestyrene caps
  166. a incar tube/valve line driver
  167. Before I punch the holes.. A quartet of EL84?
  168. Tubes Home Theater 4+1
  169. DAC direct out, not enough gain, help me build a driving stage.
  170. ultra linear aikido with linearizing pentode
  171. Scott 299
  172. OPTs With Multiple Secondaries
  173. Over Four Tons Of Tubes
  174. L channel lower output?
  175. 16LS Amp by S5 Electronics Questions
  176. Heathkit WM-5
  177. 6BL8 not on roll chart
  178. CJ PV-5 PS rebuild
  179. Attenuator for passive pre (LEAK ST 20)
  180. Help ID tubes Plz
  181. Data sheet and load line question
  182. Trouble with Silver to Black face twin mod.
  183. Grommes S35 booster amp output?
  184. dc filament heater - high impedance const. voltage
  185. Schematic for Modwright SWL 9.0se Preamp
  186. GZ37 substitutes
  187. output attenuation
  188. My humming home made tube amp
  189. Shared Cathodes 300b
  190. Bogen CHB-35 for Music...
  191. correctly connecting PT for 110/220 volts
  192. voltage divider
  193. "Bypass caps" and their effect on perceived sound
  194. Repair of Cayin HA-2 Tube Headphone Amp
  195. Best Drive for EL34
  196. Needing Schematic for Grommes LJ7 please.
  197. 6550C v. KT88
  198. ECC81 MU-Follower consumption
  199. Locating hum source
  200. c3g self oscillation problem - a newbie needs help!
  201. Voice of music console help
  202. One tube radio
  203. Triodes with better "look&feel"
  204. HV Supply
  205. Will this arrangement impact the input impedence of the cathode follower?
  206. Measuring preamp output impedance
  207. Capacitor from 120VAC to ground
  208. I have power but no sound???
  209. Using a function generator with a tube amp?
  210. What resistors to use on KT88s tubes?
  211. Opinions on Raysonic sp-200 + Raysonic 168 CD
  212. Lab power supply for testing tubes
  213. Could really use some help here!
  214. Help~ GU50 ?
  215. Some Power Supply Help
  216. newbies beware of lampizator srpp pdf
  217. Headphone output
  218. Has anyone played around with this as an amp front end?
  219. Help for Dynavox VR-70E
  220. Heathkit TT-1 (testing a 199, 99 tube)
  221. Tube And Transformer I/V Converter For Differential Current DAC
  222. Volume increases as amp warms up
  223. New 6V6 Build - Suggestions Needed
  224. Tubes Numbers
  225. VTL
  226. Visit to KR audio Prague 20120921
  227. Where did he posted it?
  228. Problems with PT325.2i
  229. What phono preamp with Dynaco MKIII
  230. opinions on supporting a past sale/trade deal
  231. Series connection of regulator tubes
  232. Preamp buzzes when volume is at zero?
  233. Hrrrrmphhhff. PSU design error and how to cope with it
  234. 300B fixed bias specs
  235. Battery filament for 4P1L
  236. Need pro help with this tube amp.
  237. Guitar Amps Output Transformer specs
  238. Need help with UTC transformer
  239. Very interesting 300b design
  240. How to understand the power output in this case?
  241. K12G Help
  242. all dht se PX4
  243. multiple output transformers per channel
  244. What would you change in this schematic? (PP amp)
  245. Anyone know where to get this type of breadboard?
  246. moscode 600 tube recommendations
  247. Should I use two separate OPTs for parallel output tubes?
  248. custom Tube chassis vendor
  249. VLS631 Thermal Delay
  250. 6au6 preamp stage

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