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  1. D3a preamp.
  2. Newbie needs advice about DIY project please!
  3. PSUD and Off load Voltage
  4. Help! AVO CT-160 Meltdown
  5. Groovewatt-Valve RIAA Phono Preamp?
  6. Mullard EL84 Reissue?
  7. Push Pull amp power supply question
  8. Aikido all in one 5687 tube pre / louder in right Channel
  9. AUDIO RESEARCH SP-6B TUBE AMPLIFIER
  10. Tube Amp
  11. Preamp Pentode Screen Voltage and Gain
  12. AUDIBLE iLLUSION m3A
  13. What "Class" amp is this?
  14. DC coupling
  15. DuKane 1A831
  16. Thump sound at turn off of a power amp
  17. DHT AC heating 120hz phase canceling
  18. REVOX Model 40 amp. Need some hand holding please.
  19. heater imbalance fixable?
  20. Headphone amp
  21. Speech Amp for Modulator
  22. 2.1 channel el84 amp help
  23. Identify PC board in little amp...
  24. dcpp vs sse vs spp? First build
  25. Spice model for GU50 (LT-Spice)
  26. Need schematic of Preamplifier AM 1065
  27. My Journey to build Tube power amplifier B300 SE
  28. Kondo M77
  29. tube datasheet gm
  30. xiang sheng best valves
  31. 6CN6/EL38 Replacement
  32. 4P55
  33. Possible or way to complicated?
  34. Jeff korneff SET 45
  35. Hickok 536 Calibration Procedure?
  36. P2p layout
  37. Heating tubes off mains voltage
  38. EL84 as preamp tube?
  39. Claus Byrith 4-30 PP with KT66
  40. biasing confusion
  41. Bogen HE-10 question
  42. Golden Tube Audio SE-100
  43. Nearing Conclusion of Line/Phono Project
  44. Bias Supply For Citation V?
  45. Tube Integrated Amp
  46. Help needed about a quad FM2 RF
  47. 21jv6 tube datasheet
  48. Interstage transformer theoretical phase change?
  49. Bootstrapping a high pass filter
  50. Help with hybrid Aikido amp! Suggestions please
  51. Need help with a Curcio Daniel 1
  52. Audio Tubes used in Industrial equipment?
  53. Hammond H1 Amp
  54. CCS assisted small signal UL pentode
  55. Dynaco ST35 B+
  56. Simple Tube Amp
  57. Portable tube amplifier
  58. Using the heater supply to get a DC source
  59. phono/aux switching problem
  60. What is the best EF86 in production at the moment
  61. 12AX7 / 12AT7 Mu Follower Phono
  62. Kreisler Stereo 6 speaker impedance
  63. A serviceable life.....
  64. TV 7 DU Tube info
  65. Twinings Tea Transformer Covers
  66. ECC88 with 12V heaters
  67. CXhange opa 627ap for an audio gd moon ?
  68. PP-EL34/6550/EL-PL504 or KT88 Bal. innput
  69. fatman itube mk1 sounds bad
  70. Chinese FD-71 tube is the russian GK-71 ?
  71. Leak stereo 20 diagnosis
  72. VTL
  73. Looking for tubed MC pre-pre
  74. Correct wiring types
  75. Couplates
  76. Op-Amp Like Line Preamp
  77. SE GU-50/6CB6 Pentode Design
  78. Pioneer SX34
  79. About metal film resistor in a tube tuner
  80. Looking for 52dBs or more MM phono
  81. Winter is coming... Time to start GM70 SE parafeed amp
  82. Doug Self: Wireless World Magazine Article Archive
  83. Relay short circuit
  84. EL34 PP oscillating
  85. Dynaco switchable diode/tube rec and driver tube mode
  86. CCS into a VR with Interstage question
  87. 6SN7-6V6x2 DC coupled 2 stage with stacked supplies
  88. Rectifier and DC filtering relationship question
  89. Class A2 6JD5 Curves
  90. Motorola HS-839 Amp problem
  91. Active valve monitors?
  92. Did I get this load calculation right?
  93. Convergent SL1 original schematic
  94. Bleed down resistor
  95. How do I calculate resistor value in this schematic?
  96. Easy question about tube data sheet
  97. Tube regulator question
  98. Tube amp build for an 1st timer.
  99. Full music 101d input tube/valve
  100. EZ80 Voltage Question
  101. What the heck is this? Bulb?
  102. Audio Note Kit 1 Upgrade
  103. Will this work? (EL34 PP)
  104. Anthem 1 intergrated amp
  105. Tubes and the sun?
  106. Two triodes cascaded cathode follower?
  107. HIRAGA PREAMP PHONO + line
  108. OB2WA Radioactive???
  109. 9 pin tube socket pcb boards with screw terminals
  110. Hai I need a little help on designing a power supply
  111. Tesla E83CC Frame Grid Tube Purchase - Legitimate Production or Fakes?
  112. Cleaning Up the Noise + Selector Switch Anomalie
  113. first tube preamp
  114. Rescuing a vessel : 1964 HICKOK 539C tube tester
  115. Dynaco Feedback
  116. Mundorf Silver Oil in hot 300B tube amplifier !!
  117. MULLARD 5-20 build with mods
  118. Choke loaded driver with small opt?
  119. Preamp Tube Bias and feedback
  120. Capacitor replacement option
  121. New EL84 SE Amp PCB: The u-SE
  122. Question about Amp Theory
  123. Help needed for modifying DAC-opamp-tube circuit
  124. best way to start with tube amps
  125. Damper diode between C1 and L1
  126. Question about 'near' zero volt bias for low level stages
  127. Filmosound 179 - Should I even bother?
  128. Newbie question
  129. I think I know how it works, but can I get some help? (OddWatt PP)
  130. kt150
  131. As anyone considered black oxide???
  132. OTL question
  133. Headphone amp/preamp project.
  134. Comments or suggestions on this schematic?
  135. Twin Conn Organ 7868 Rebuild
  136. Favorite PP 6550 schematic?
  137. DECWARE Z BOX SCHEMATIC
  138. 6V6
  139. Need suggestion for eliminating noise from aluminum cover
  140. Kuba Serenade Stereo Console question.
  141. Help with tube interchangeability
  142. 6sn7(12au7)-6v6-300b
  143. Westinghouse tube amp MODEL V2508, conversion
  144. Voltage on the chassis, bad xformer?
  145. TubeCad blues...
  146. OPT as PSU filter???
  147. Tube Plate Voltage Timing
  148. Transformer grounding
  149. Two questions concerning bleed resistors
  150. Choke ratings and resistor values in choke input supply?
  151. Novar Spud :: A $200 sweep tube Spud with PCB
  152. Mid 50s 250/500/1000W Valve amp needs some repairs......
  153. I want to learn tubes and set up a workstation
  154. Pre amp wire up__new
  155. allied knight / rauland borg schematic needed
  156. Rollable Tubes
  157. n00b - Leave out the LEDs??
  158. Aikido 5687 all in one kit
  159. 6P13S - WHAT TO DO WITH
  160. el84 set amp for 90db-8ohm speaker?
  161. My first cap coupled 2 stage
  162. Dodd Buffer Tube Rolling?
  163. Lowest THD Tube Design Possible? (Need for a class, I realize it doesn't matter)
  164. Olson-Morgan 6F6 Amplifier Info's needed.
  165. Newbie, Help with datasheet
  166. Conrad Johnson MV55 again - and Hi from a newb
  167. Interesting one piece EL34 PP tube amp diy pcb on ebay
  168. Low power stereo (dual mono) tube headphone amp
  169. 6EJ7's vs. 6JC6A
  170. EL34s Frying in my Cayin A50-T
  171. Grid Leak Amplifier with Unexpected Heater Resistor
  172. 7617 tube data
  173. preamplifier with huge amplification
  174. Counterpoint Amp Output
  175. Phase inverter Gremlins in Philips EL6431 amp
  176. Russian to English Translation needed
  177. Concertina type Phase inverters?
  178. Double C-Core output transformers
  179. Amplifier slew rate and DSD playback
  180. Bypassing volume pot on Cayin integrated tube amp
  181. Distortion when change into ecc83
  182. Mighty Midget Problem (One channel is louder)
  183. Mullard ECL86 3W Economical Amplifier
  184. Building a Baby Huey EL84 amp - might need some pointers
  185. Tranformer Choice
  186. Heathkit WM-5
  187. Aikido preamp power supply
  188. identify this traffo
  189. transformers
  190. parallel tube amplifier.
  191. What to do with a 12" x 8" enclosure?
  192. Odd filament winding
  193. transformers
  194. tube choices for an ST70
  195. "Arabella" - 6EM7 amplifier on Acacia
  196. CDE acquisition of Orange Drop Brand
  197. What is this inductor?
  198. Counterpoint SA-5000 upgrade
  199. Homebrew tube preamp noise
  200. Cathode follower with 12ax7
  201. CPC Japanese Tubes ?
  202. Cary SLA-70 with KT88 - worth building?
  203. Opinions or comments on schematic please
  204. Is this a tie point or a diode?
  205. Pushing EL36 ??
  206. Power Supply Chokes Question ?
  207. First Post, Viking/T Eaton co Tube Amp Issues! *Pictures*
  208. Knight 40 W Amp. tubes correct? Location?
  209. Push-Pull Output Transformer with Cathode Feedback Winding?
  210. 300b amp help
  211. Help with Dynaco value
  212. INTERSTAGE 2A3/211
  213. TCJ Push Pull Amp Calculator question
  214. winter project KT88 PP
  215. En Vogue Darling SRPP SE SRPP tube amp will this work?
  216. Shunt regulation for HT
  217. Unison research simply two, what gridvoltage for EL34?
  218. Finally Measured my Tube Preamp
  219. Aikido octal stereo problems
  220. Philips 5 pin IEC connector in AG9016
  221. Dynaclone OPT replacement - less power than expected
  222. 2 ECL 805 SE
  223. All DHT headphone amp with 4P1L & 307A
  224. cary audio rocket 88 tube amp
  225. Compactron Driver Dynaco MarkIII PCB Design.
  226. Paralelling pentodes ?
  227. KT120 Single Ended Ultralinear
  228. Does a PCL805 glow red at its maximum rating?
  229. V1 Noise Reduction Choices
  230. full pentode ppp
  231. Input transformer question
  232. Is this Tesla ECC803S real or fake?
  233. Michaelson and Austin TVA-1
  234. EN VOGUE DARLING SRPP SE PARALLEL 1626 REVIEW NEEDED
  235. 6EB8\6GN8 P-P Output 2*12w Class-B
  236. B+ regulator for KT88 amplifier
  237. Help figuring out wind/hiss
  238. 12A07 low voltage preamp
  239. Buying guideline for 6c33c
  240. New 211/VT4c shootout
  241. GM70 Output transformer
  242. OTL 2013
  243. Octal Preamp Triode Thoughts (IDHT's)
  244. Wrong tube and pin wiring
  245. New Production Tube If Transformers from Germany
  246. Vishay TX2575 resistor placement
  247. Direct connected madness
  248. RH84 build & quite a few questions...
  249. Tube preamp kits
  250. Capacitor query L1 audio innovation pre-amp

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