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  1. bad PX4? dark blue glow
  2. Soft Start/bucking transformer For Marantz 9 Monoblocks
  3. Direct coupling with CCS
  4. 407A/B Preamp
  5. Bad 845 tube? (video link)
  6. Dynaco PAS 4
  7. OTL Amplifier in 1990 Glass Audio Magazine
  8. Volume drop when playing and hiss noise at turning off from one channel
  9. OPT in or near loudspeaker?
  10. Soft start for tube amplifier
  11. Transformer Sizing, etc
  12. 4P1L filament oscillation
  13. Toroidal power transformers in a tube amp
  14. No left channel output
  15. Conrad Johnson PV-10 squeal!
  16. Need expert help on EL34 SE tube amplifier.
  17. 12pin/compactron tube socket
  18. Aikido audio problem w/ mains voltage fluctuations
  19. Radford STA-12
  20. New popping sound from my amp
  21. Line stage experiments with 6sn7
  22. simple SE headphone amp
  23. Aesthetix Metis Linestage
  24. Problem with Antique Sounds Pre Amp
  25. Output coupling capacitor question
  26. Screen Voltage present without B+
  27. jolida jd3000b preamp
  28. Need help on output transformer wiring alternatives
  29. Hi-End Push-Pull universal driver
  30. schematic for pentode 42 SE
  31. 6L6 / EL34 / EL84 / 6V6 frequency response curves?
  32. cheap and dirty supply
  33. EL84 SET red plating problem
  34. Using Aikido Topology to make Phono Preamp and Power Supply
  35. 5687 & OB2 as an excellent HT regulator
  36. 6S45P-E questions
  37. Extreme hybrid, a 100W with the vacuum tube sound
  38. Test Settings for a EL33/6AG6/6M6 on Eico 628 tester
  39. Chinook (Baby Amp II)
  40. Einstein Amplifier Input and Driver Section
  41. Tube System for Symphony/Jazz
  42. What is the purpose of C3 & C4?
  43. Yes, I'm the one who bought it...
  44. Capacitor Values
  45. Parks Audio / Triode ST35 kit?
  46. noob question.
  47. First stereo amp "Newbie" questions
  48. Newbie tries to design an amp
  49. Help - analysis on an output KT88 PP amp
  50. 12T10 triode connection - similar "real" triode to compare to?
  51. Recommendations for tube preamp (vinyl playback)
  52. Magnavox 8802 refurb boutique or standard parts.
  53. Allen model 75 organ amplifiers modifications
  54. Capacitance of rectifier tubes/valves near V=0??
  55. Volume/selector switch
  56. Auto Bias w/ LM317
  57. Volume drops and then comes back - anyone recognizes the sympthom?
  58. Cathode Follower and Volume Pot
  59. Dyna Mark III monoblocks. Driver boards and some questions on modding.
  60. switching a 5y3 for a 5y4?
  61. K-12M in Ultra Linear Mode Volume Issue
  62. SA 260 Pilot tube amplifier
  63. Standard Earmax Mod
  64. 470V using Bridge vs. 230V using Doubler
  65. Troublesome hybrid shengya a10..
  66. Heater Dropping Resistors
  67. Useing Mosfet in cathode leg of phase splitter
  68. Cleaning old tube sockets with common household products
  69. Automatic Bias Kit
  70. Triode mode Pentode G2 resistor?
  71. Rectifier.
  72. Tube gainstage for newbie
  73. Source follower irf720 or DN2540
  74. Toroidal OPT
  75. Tesla E83CC - Have done research & still havingt trouble spotting fakes from real
  76. SE Power amp SG2 voltage
  77. Bias supply
  78. 7377 tube socket
  79. Power Transformer Impedance Matching
  80. zenith console amplifier (a stereo mono amplifier :) )
  81. Trutone model Teeco 610-D
  82. electromagnetic hum problem
  83. Heathkit A7 Volume.
  84. Ribbon Tube Amp
  85. Brimar ECC83 with red bottom
  86. Dynaco ST 35 Cheap Transformers source in EU
  87. Transformer input for P-P
  88. Help Identifying 12au7a From Hammond Organ
  89. K502 Bleeder and LED
  90. Cathode follower attenuates signal
  91. Anyone has a curve tracer to trace Western Electric 436A 448A 418A in triode mode ?
  92. Breadboards and tube voltages
  93. Dynaco 35 Power Supply
  94. Magic eye with tube em80-schematic or circuit
  95. Using 220v amp in country with 230v
  96. Magic eye with EM81 tube - made in China
  97. Improvement Suggestion Wanted: 6AS7 Hybrid PP Amp
  98. Tube amp instability in LTSpice (Claus Byrith 4-30)
  99. Current mfg triode's
  100. K12g upgrades
  101. Help Needed Identifying a Custom Tube Amp
  102. 6dj8 6922 driver question
  103. APPJ PA0901A Repair
  104. Output tube G1 resistors question
  105. Building Mullard PP ECL86 stereo
  106. 6SN7 Parallel Preamp Anyone?
  107. Advice on Finishing my K502 Build
  108. Ferrite SE Outut XFMR for HF Tube Amp
  109. Question about grounding a 2-prong tube amp
  110. Grommes Mono Block
  111. EL84 triode mode @ 425V?
  112. Hybrid amp - Grounding Suggestions?
  113. Advises asked for, exquisite taste wanted!!
  114. need a good 2a3 socket... need advice
  115. Cathode feedback comments?
  116. Does different Rectifier Tubes change the tone????
  117. Another boring day
  118. el84 Tube amp
  119. Haddon PL151 Quad II input transformer
  120. Noob question
  121. Futterman H3 Set Up
  122. Any tube guys here use a MiniDSP
  123. Should Output Transformers be replaced
  124. Quad II questions
  125. MY OTL Tim Mellow-ESL 63 PROJECT
  126. Zobel for REDD47 w/ HA-100 Inpu
  127. Pentode P-P - cathode biasing for A and AB
  128. Why a Headphone Amp?
  129. How little B+ ripple do I really need?
  130. Need good EF86 based RIAA preamp.
  131. Which Tube amplifier should I build first?
  132. 6L6GC in Push Pull Class A - how much power out?
  133. ECC83 DC Heater Supply - without CT
  134. PPP EL84 monoblocs: i knew then what i know now...
  135. zener, voltage devider or 02A
  136. DHT heater current draw - how fast?
  137. Rca sa752
  138. Audio Research and Octal Pre's
  139. Scott 299D
  140. Unison Smart 845 big problem
  141. Need help with driver idea for 845 amp - have a few ideas
  142. Input impedance on cathode follower stage?
  143. Picked up a box of tubes for $5.. What tubes are usable?
  144. A Raven preamp (mk2) finished
  145. need help searching for ground
  146. Pre-amp transformer output
  147. Boyuu EL34 A9 Tube Amp
  148. Hybrid 15W, want feedback - work in-progress
  149. SP12 and PH12 Pre and Phono from Vacuum Tube Audio
  150. Which tube amp for Telefunken-tlx3 loudspeakers?
  151. Burned up a tube - want to be sure I know why
  152. Output Transformer Windings in parallel
  153. New tube tech from Korg
  154. Got some PX4 valves from an old radiogram
  155. At the start: Triodedick´s Monobill Classic KT88 Monos
  156. Recommended HT current limit for old stock power transformers
  157. preamp circuit
  158. Low impedance headphone amp
  159. "Earthing" in DIY tube preamps
  160. Tube amp help
  161. How to draw a dynamic load line for cathode bypass triode like 12AX7
  162. Common Grid design
  163. 6AW8-A
  164. Push pull amp without GNFB
  165. No filament voltage
  166. Selecting Component Values for Simple Current-Feedback Amplifier
  167. 4 Blown Soft Recovery Diodes...Are TV Damper Tubes more Reliable?
  168. Just got a nice EL84 based receiver
  169. Is there any good current Production 6550s?
  170. Building the Damn Good 300B
  171. convert trashed kolster k20 into tube amp?
  172. Junkbox Hero
  173. KT150 curves by Sofia
  174. My new EL84 Amp
  175. parallel el84 output pp. shared coupling caps?
  176. Will a Western Electric 422A substitute for a 5Y3?
  177. Question for a moderator
  178. bottlehead quickie schematic
  179. RCA 6146B sub for 807 or 6L6?
  180. Leak monoblock hum
  181. Eico 2036
  182. Heathkit iT-12 signal tracer to much gain??
  183. Valve Monoblocks - am I being realistic?
  184. Aikido Headphone Amp and PS1 Power supply
  185. Transforming a triode into a pentode?
  186. New to amps - Long-tail pair and heater hum
  187. Experimenting with the Aikido 12Vac kit
  188. Strategies for Implementing Negative Feedback in a 12ax7 Line Amplifier
  189. Output Transformer Impedances
  190. PP 6l6 class ab...advice needed
  191. 300B
  192. 12AX7 EL34B TUBE AMPLIFIER
  193. UK info please
  194. PAS 2/3 RIAA Modification
  195. My Homage to the Earmax Headphone Amp
  196. Aikio Line Stage
  197. Love those triodes
  198. Differential Pair with negative feedback
  199. Quad II Eighty Schematic?
  200. Adventures with Aikido
  201. Beard BB 100 and Beard A35
  202. Noob is about to press the BIN button and buy a Chinese tube amp kit. Save me/ help?
  203. Ebay Kit EL34 6n9P 5Z3P Build Thread.
  204. Sakuma 46 / 801A Circuit
  205. Tube Manufacturing at Expo-Pul
  206. Philips EL6410, how does it sound?
  207. tube amp power help
  208. Video from the Czech Tesla Tube factory
  209. Alan0354's Rantings
  210. 3 x 3 Tube amp 30 watts
  211. Maximum allowed capacitance after gas rectifiers
  212. PSUD2 rectifiers list
  213. EL34 amplifier with these transformers
  214. Aikido Octal Dual Mono for Dummies... Help me.
  215. Monster Trans or Really Good Doorstop?
  216. The correct way to wire DC filaments 3B7 DHT
  217. Haller Circuit Problems
  218. Need recommendation for VERY basic amp project
  219. Recommendation on tube buffer?
  220. For Your Consideration: Unity Coupled Plitron Amp, No Bootstrapped Driver, No GNF
  221. Tango Transformers - any unique push pull circuits?
  222. newbe at designing tube amp
  223. Trouble shooting vintage Harman Kardon A250
  224. Coating on Hammond Power Transformer
  225. Small tube amp for PC
  226. CCS dissipation
  227. 6SL7 - grid stopper values
  228. HELP - Laying out footprint for 9 pin tube socket
  229. Telefunken Magnetophon 104 - Keep or strip?
  230. Transformer rewinding or repair needed.
  231. Sun Audio in the USA?
  232. Wyetech Opal 6SN7 tube preamp, any DIY kit sound even close?
  233. Praise for the 6N6G
  234. DHT equivalent to 12AT7?
  235. BIAS Consonance M800SE
  236. SE ECC83 - EL 84 - EZ 81 - 1964 !
  237. Name That Design!!
  238. Distortion expected in SE DC coupled 26/45 amp
  239. One Channel is Louder than the other on my Tube Phono Pre
  240. Need a Zobel Network (or RC shunt) in tube amplifier?
  241. Aikido 12VAC Help needed
  242. Novarria TU-30 output transformer
  243. Question on Schematic
  244. CJ PV-10A
  245. Mcintosh C2200 ReCap
  246. simple tube amp for music
  247. SE Parafeed Signal Return ?
  248. RCA VC274
  249. Heathkit w5
  250. tube rectifier for 1000v AC

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