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  1. Line stage experiments with 6sn7
  2. simple SE headphone amp
  3. Aesthetix Metis Linestage
  4. Problem with Antique Sounds Pre Amp
  5. Output coupling capacitor question
  6. Screen Voltage present without B+
  7. jolida jd3000b preamp
  8. Need help on output transformer wiring alternatives
  9. Hi-End Push-Pull universal driver
  10. schematic for pentode 42 SE
  11. 6L6 / EL34 / EL84 / 6V6 frequency response curves?
  12. cheap and dirty supply
  13. EL84 SET red plating problem
  14. Using Aikido Topology to make Phono Preamp and Power Supply
  15. 5687 & OB2 as an excellent HT regulator
  16. 6S45P-E questions
  17. Extreme hybrid, a 100W with the vacuum tube sound
  18. Test Settings for a EL33/6AG6/6M6 on Eico 628 tester
  19. Chinook (Baby Amp II)
  20. Einstein Amplifier Input and Driver Section
  21. Tube System for Symphony/Jazz
  22. What is the purpose of C3 & C4?
  23. Yes, I'm the one who bought it...
  24. Capacitor Values
  25. Parks Audio / Triode ST35 kit?
  26. noob question.
  27. First stereo amp "Newbie" questions
  28. Newbie tries to design an amp
  29. Help - analysis on an output KT88 PP amp
  30. 12T10 triode connection - similar "real" triode to compare to?
  31. Recommendations for tube preamp (vinyl playback)
  32. Magnavox 8802 refurb boutique or standard parts.
  33. Allen model 75 organ amplifiers modifications
  34. Capacitance of rectifier tubes/valves near V=0??
  35. Volume/selector switch
  36. Auto Bias w/ LM317
  37. Volume drops and then comes back - anyone recognizes the sympthom?
  38. Cathode Follower and Volume Pot
  39. Dyna Mark III monoblocks. Driver boards and some questions on modding.
  40. switching a 5y3 for a 5y4?
  41. K-12M in Ultra Linear Mode Volume Issue
  42. SA 260 Pilot tube amplifier
  43. Standard Earmax Mod
  44. 470V using Bridge vs. 230V using Doubler
  45. Troublesome hybrid shengya a10..
  46. Heater Dropping Resistors
  47. Useing Mosfet in cathode leg of phase splitter
  48. Cheap (<100€) Digital Tube Tester from ebay; experience/build/mod thread
  49. Cleaning old tube sockets with common household products
  50. Automatic Bias Kit
  51. Triode mode Pentode G2 resistor?
  52. Rectifier.
  53. Tube gainstage for newbie
  54. Source follower irf720 or DN2540
  55. Toroidal OPT
  56. Tesla E83CC - Have done research & still havingt trouble spotting fakes from real
  57. Can Capacitor
  58. SE Power amp SG2 voltage
  59. Bias supply
  60. 7377 tube socket
  61. Power Transformer Impedance Matching
  62. zenith console amplifier (a stereo mono amplifier :) )
  63. Trutone model Teeco 610-D
  64. electromagnetic hum problem
  65. Heathkit A7 Volume.
  66. Ribbon Tube Amp
  67. Brimar ECC83 with red bottom
  68. Dynaco ST 35 Cheap Transformers source in EU
  69. Transformer input for P-P
  70. Help Identifying 12au7a From Hammond Organ
  71. K502 Bleeder and LED
  72. Cathode follower attenuates signal
  73. Anyone has a curve tracer to trace Western Electric 436A 448A 418A in triode mode ?
  74. Breadboards and tube voltages
  75. Dynaco 35 Power Supply
  76. Magic eye with tube em80-schematic or circuit
  77. Using 220v amp in country with 230v
  78. Magic eye with EM81 tube - made in China
  79. Improvement Suggestion Wanted: 6AS7 Hybrid PP Amp
  80. Tube amp instability in LTSpice (Claus Byrith 4-30)
  81. Current mfg triode's
  82. K12g upgrades
  83. Help Needed Identifying a Custom Tube Amp
  84. Capacitor Voltage rating
  85. 6dj8 6922 driver question
  86. APPJ PA0901A Repair
  87. Output tube G1 resistors question
  88. Building Mullard PP ECL86 stereo
  89. 6SN7 Parallel Preamp Anyone?
  90. Advice on Finishing my K502 Build
  91. Another SSE build question
  92. Ferrite SE Outut XFMR for HF Tube Amp
  93. Question about grounding a 2-prong tube amp
  94. Grommes Mono Block
  95. EL84 triode mode @ 425V?
  96. Hybrid amp - Grounding Suggestions?
  97. Advises asked for, exquisite taste wanted!!
  98. need a good 2a3 socket... need advice
  99. Cathode feedback comments?
  100. Does different Rectifier Tubes change the tone????
  101. Another boring day
  102. el84 Tube amp
  103. Haddon PL151 Quad II input transformer
  104. Noob question
  105. Futterman H3 Set Up
  106. Good tube amp for bass
  107. Any tube guys here use a MiniDSP
  108. Should Output Transformers be replaced
  109. Quad II questions
  110. MY OTL Tim Mellow-ESL 63 PROJECT
  111. Zobel for REDD47 w/ HA-100 Inpu
  112. Pentode P-P - cathode biasing for A and AB
  113. Why a Headphone Amp?
  114. How little B+ ripple do I really need?
  115. Need good EF86 based RIAA preamp.
  116. Marshall 9005 modification
  117. Which Tube amplifier should I build first?
  118. Sound Practices Magazines, Complete Set 98% perfect
  119. 6L6GC in Push Pull Class A - how much power out?
  120. ECC83 DC Heater Supply - without CT
  121. PPP EL84 monoblocs: i knew then what i know now...
  122. zener, voltage devider or 02A
  123. DHT heater current draw - how fast?
  124. Rca sa752
  125. Audio Research and Octal Pre's
  126. Scott 299D
  127. Unison Smart 845 big problem
  128. Need help with driver idea for 845 amp - have a few ideas
  129. Input impedance on cathode follower stage?
  130. Picked up a box of tubes for $5.. What tubes are usable?
  131. Need help on potentiometer.
  132. A Raven preamp (mk2) finished
  133. need help searching for ground
  134. Pre-amp transformer output
  135. Boyuu EL34 A9 Tube Amp
  136. Hybrid 15W, want feedback - work in-progress
  137. PT from scratch for 100 W Marshall 2555 Silver Jubilee - advices and comments ...
  138. SP12 and PH12 Pre and Phono from Vacuum Tube Audio
  139. Which tube amp for Telefunken-tlx3 loudspeakers?
  140. Burned up a tube - want to be sure I know why
  141. Output Transformer Windings in parallel
  142. New tube tech from Korg
  143. Got some PX4 valves from an old radiogram
  144. At the start: Triodedick´s Monobill Classic KT88 Monos
  145. Choose your harmonic distribution: which sound better?
  146. Recommended HT current limit for old stock power transformers
  147. preamp circuit
  148. Low impedance headphone amp
  149. "Earthing" in DIY tube preamps
  150. Tube amp help
  151. How to draw a dynamic load line for cathode bypass triode like 12AX7
  152. Common Grid design
  153. 6AW8-A
  154. Push pull amp without GNFB
  155. No filament voltage
  156. Selecting Component Values for Simple Current-Feedback Amplifier
  157. 4 Blown Soft Recovery Diodes...Are TV Damper Tubes more Reliable?
  158. Just got a nice EL84 based receiver
  159. Is there any good current Production 6550s?
  160. Building the Damn Good 300B
  161. convert trashed kolster k20 into tube amp?
  162. Junkbox Hero
  163. KT150 curves by Sofia
  164. My new EL84 Amp
  165. 1955 Bogen J330 Mic Input Problem
  166. parallel el84 output pp. shared coupling caps?
  167. Will a Western Electric 422A substitute for a 5Y3?
  168. Question for a moderator
  169. bottlehead quickie schematic
  170. RCA 6146B sub for 807 or 6L6?
  171. Leak monoblock hum
  172. Eico 2036
  173. Heathkit iT-12 signal tracer to much gain??
  174. Valve Monoblocks - am I being realistic?
  175. Aikido Headphone Amp and PS1 Power supply
  176. Transforming a triode into a pentode?
  177. New to amps - Long-tail pair and heater hum
  178. Experimenting with the Aikido 12Vac kit
  179. Strategies for Implementing Negative Feedback in a 12ax7 Line Amplifier
  180. Output Transformer Impedances
  181. PP 6l6 class ab...advice needed
  182. 300B
  183. 12AX7 EL34B TUBE AMPLIFIER
  184. UK info please
  185. PAS 2/3 RIAA Modification
  186. My Homage to the Earmax Headphone Amp
  187. Aikio Line Stage
  188. Lite Audio LS 58 schematic
  189. Lite Audio LS 58 schematic
  190. Love those triodes
  191. Differential Pair with negative feedback
  192. Quad II Eighty Schematic?
  193. Adventures with Aikido
  194. Beard BB 100 and Beard A35
  195. Noob is about to press the BIN button and buy a Chinese tube amp kit. Save me/ help?
  196. Ebay Kit EL34 6n9P 5Z3P Build Thread.
  197. Sakuma 46 / 801A Circuit
  198. Tube Manufacturing at Expo-Pul
  199. Philips EL6410, how does it sound?
  200. tube amp power help
  201. Video from the Czech Tesla Tube factory
  202. Alans' rantings
  203. 3 x 3 Tube amp 30 watts
  204. Maximum allowed capacitance after gas rectifiers
  205. PSUD2 rectifiers list
  206. EL34 amplifier with these transformers
  207. Aikido Octal Dual Mono for Dummies... Help me.
  208. Monster Trans or Really Good Doorstop?
  209. The correct way to wire DC filaments 3B7 DHT
  210. Haller Circuit Problems
  211. Need recommendation for VERY basic amp project
  212. Recommendation on tube buffer?
  213. For Your Consideration: Unity Coupled Plitron Amp, No Bootstrapped Driver, No GNF
  214. Tango Transformers - any unique push pull circuits?
  215. newbe at designing tube amp
  216. Need help with microphone preamp.
  217. Trouble shooting vintage Harman Kardon A250
  218. Coating on Hammond Power Transformer
  219. Small tube amp for PC
  220. CCS dissipation
  221. 6SL7 - grid stopper values
  222. HELP - Laying out footprint for 9 pin tube socket
  223. Telefunken Magnetophon 104 - Keep or strip?
  224. Transformer rewinding or repair needed.
  225. Sun Audio in the USA?
  226. Wyetech Opal 6SN7 tube preamp, any DIY kit sound even close?
  227. KBG capacitors
  228. Praise for the 6N6G
  229. DHT equivalent to 12AT7?
  230. Why high voltage in coupling caps?
  231. BIAS Consonance M800SE
  232. SE ECC83 - EL 84 - EZ 81 - 1964 !
  233. Name That Design!!
  234. Distortion expected in SE DC coupled 26/45 amp
  235. One Channel is Louder than the other on my Tube Phono Pre
  236. Need a Zobel Network (or RC shunt) in tube amplifier?
  237. Aikido 12VAC Help needed
  238. Novarria TU-30 output transformer
  239. Question on Schematic
  240. CJ PV-10A
  241. Mcintosh C2200 ReCap
  242. simple tube amp for music
  243. SE Parafeed Signal Return ?
  244. RCA VC274
  245. Heathkit w5
  246. tube rectifier for 1000v AC
  247. New Tubes For Peavey Valveking VK100
  248. Tone Control Intercept Point on TU 8200
  249. Help with transformer and power switch wiring
  250. Mullard 5-20 iron

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