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  1. 6880 Triode cascode guitar amp
  2. bad PX4? dark blue glow
  3. Soft Start/bucking transformer For Marantz 9 Monoblocks
  4. Direct coupling with CCS
  5. 407A/B Preamp
  6. Bad 845 tube? (video link)
  7. Blues Jr. Mods
  8. Dynaco PAS 4
  9. OTL Amplifier in 1990 Glass Audio Magazine
  10. Volume drop when playing and hiss noise at turning off from one channel
  11. OPT in or near loudspeaker?
  12. Soft start for tube amplifier
  13. Transformer Sizing, etc
  14. 4P1L filament oscillation
  15. Toroidal power transformers in a tube amp
  16. No left channel output
  17. Conrar Johnson PV-10 squeal!
  18. Need expert help on EL34 SE tube amplifier.
  19. Coupling Caps
  20. 12pin/compactron tube socket
  21. Aikido audio problem w/ mains voltage fluctuations
  22. Radford STA-12
  23. New popping sound from my amp
  24. Line stage experiments with 6sn7
  25. simple SE headphone amp
  26. Aesthetix Metis Linestage
  27. Problem with Antique Sounds Pre Amp
  28. Output coupling capacitor question
  29. Screen Voltage present without B+
  30. jolida jd3000b preamp
  31. Need help on output transformer wiring alternatives
  32. Hi-End Push-Pull universal driver
  33. schematic for pentode 42 SE
  34. 6L6 / EL34 / EL84 / 6V6 frequency response curves?
  35. cheap and dirty supply
  36. EL84 SET red plating problem
  37. Using Aikido Topology to make Phono Preamp and Power Supply
  38. 5687 & OB2 as an excellent HT regulator
  39. 6S45P-E questions
  40. Extreme hybrid, a 100W with the vacuum tube sound
  41. Test Settings for a EL33/6AG6/6M6 on Eico 628 tester
  42. Chinook (Baby Amp II)
  43. Einstein Amplifier Input and Driver Section
  44. Tube System for Symphony/Jazz
  45. What is the purpose of C3 & C4?
  46. Yes, I'm the one who bought it...
  47. Capacitor Values
  48. Parks Audio / Triode ST35 kit?
  49. noob question.
  50. First stereo amp "Newbie" questions
  51. Newbie tries to design an amp
  52. Help - analysis on an output KT88 PP amp
  53. 12T10 triode connection - similar "real" triode to compare to?
  54. Recommendations for tube preamp (vinyl playback)
  55. Magnavox 8802 refurb boutique or standard parts.
  56. Allen model 75 organ amplifiers modifications
  57. Capacitance of rectifier tubes/valves near V=0??
  58. Volume/selector switch
  59. Auto Bias w/ LM317
  60. Volume drops and then comes back - anyone recognizes the sympthom?
  61. Cathode Follower and Volume Pot
  62. Dyna Mark III monoblocks. Driver boards and some questions on modding.
  63. switching a 5y3 for a 5y4?
  64. K-12M in Ultra Linear Mode Volume Issue
  65. SA 260 Pilot tube amplifier
  66. Standard Earmax Mod
  67. 470V using Bridge vs. 230V using Doubler
  68. Troublesome hybrid shengya a10..
  69. Heater Dropping Resistors
  70. Useing Mosfet in cathode leg of phase splitter
  71. Cheap (<100€) Digital Tube Tester from ebay; experience/build/mod thread
  72. Cleaning old tube sockets with common household products
  73. Automatic Bias Kit
  74. Triode mode Pentode G2 resistor?
  75. Rectifier.
  76. Tube gainstage for newbie
  77. Source follower irf720 or DN2540
  78. Toroidal OPT
  79. Tesla E83CC - Have done research & still havingt trouble spotting fakes from real
  80. Can Capacitor
  81. SE Power amp SG2 voltage
  82. Bias supply
  83. 7377 tube socket
  84. Power Transformer Impedance Matching
  85. zenith console amplifier (a stereo mono amplifier :) )
  86. Trutone model Teeco 610-D
  87. electromagnetic hum problem
  88. Heathkit A7 Volume.
  89. Western Electric Parafeed
  90. Ribbon Tube Amp
  91. Brimar ECC83 with red bottom
  92. Dynaco ST 35 Cheap Transformers source in EU
  93. Transformer input for P-P
  94. Help Identifying 12au7a From Hammond Organ
  95. K502 Bleeder and LED
  96. Cathode follower attenuates signal
  97. Anyone has a curve tracer to trace Western Electric 436A 448A 418A in triode mode ?
  98. Breadboards and tube voltages
  99. Dynaco 35 Power Supply
  100. Magic eye with tube em80-schematic or circuit
  101. Using 220v amp in country with 230v
  102. Magic eye with EM81 tube - made in China
  103. Improvement Suggestion Wanted: 6AS7 Hybrid PP Amp
  104. Tube amp instability in LTSpice (Claus Byrith 4-30)
  105. Current mfg triode's
  106. K12g upgrades
  107. Help Needed Identifying a Custom Tube Amp
  108. Capacitor Voltage rating
  109. 6dj8 6922 driver question
  110. APPJ PA0901A Repair
  111. Output tube G1 resistors question
  112. Building Mullard PP ECL86 stereo
  113. 6SN7 Parallel Preamp Anyone?
  114. Advice on Finishing my K502 Build
  115. Another SSE build question
  116. Ferrite SE Outut XFMR for HF Tube Amp
  117. Question about grounding a 2-prong tube amp
  118. Grommes Mono Block
  119. EL84 triode mode @ 425V?
  120. Hybrid amp - Grounding Suggestions?
  121. Advises asked for, exquisite taste wanted!!
  122. need a good 2a3 socket... need advice
  123. Cathode feedback comments?
  124. Does different Rectifier Tubes change the tone????
  125. Another boring day
  126. el84 Tube amp
  127. Haddon PL151 Quad II input transformer
  128. Noob question
  129. Futterman H3 Set Up
  130. Good tube amp for bass
  131. Any tube guys here use a MiniDSP
  132. Should Output Transformers be replaced
  133. Quad II questions
  134. MY OTL Tim Mellow-ESL 63 PROJECT
  135. Zobel for REDD47 w/ HA-100 Inpu
  136. Pentode P-P - cathode biasing for A and AB
  137. Why a Headphone Amp?
  138. How little B+ ripple do I really need?
  139. Need good EF86 based RIAA preamp.
  140. Marshall 9005 modification
  141. Which Tube amplifier should I build first?
  142. Sound Practices Magazines, Complete Set 98% perfect
  143. 6L6GC in Push Pull Class A - how much power out?
  144. ECC83 DC Heater Supply - without CT
  145. PPP EL84 monoblocs: i knew then what i know now...
  146. zener, voltage devider or 02A
  147. DHT heater current draw - how fast?
  148. Rca sa752
  149. Audio Research and Octal Pre's
  150. Scott 299D
  151. Unison Smart 845 big problem
  152. Need help with driver idea for 845 amp - have a few ideas
  153. Input impedance on cathode follower stage?
  154. Picked up a box of tubes for $5.. What tubes are usable?
  155. Need help on potentiometer.
  156. A Raven preamp (mk2) finished
  157. need help searching for ground
  158. Pre-amp transformer output
  159. Boyuu EL34 A9 Tube Amp
  160. Hybrid 15W, want feedback - work in-progress
  161. PT from scratch for 100 W Marshall 2555 Silver Jubilee - advices and comments ...
  162. SP12 and PH12 Pre and Phono from Vacuum Tube Audio
  163. Which tube amp for Telefunken-tlx3 loudspeakers?
  164. Burned up a tube - want to be sure I know why
  165. Output Transformer Windings in parallel
  166. New tube tech from Korg
  167. Got some PX4 valves from an old radiogram
  168. At the start: Triodedick´s Monobill Classic KT88 Monos
  169. Choose your harmonic distribution: which sound better?
  170. Recommended HT current limit for old stock power transformers
  171. preamp circuit
  172. Low impedance headphone amp
  173. "Earthing" in DIY tube preamps
  174. Tube amp help
  175. How to draw a dynamic load line for cathode bypass triode like 12AX7
  176. Common Grid design
  177. 6AW8-A
  178. Push pull amp without GNFB
  179. No filament voltage
  180. Selecting Component Values for Simple Current-Feedback Amplifier
  181. 4 Blown Soft Recovery Diodes...Are TV Damper Tubes more Reliable?
  182. Just got a nice EL84 based receiver
  183. Is there any good current Production 6550s?
  184. Building the Damn Good 300B
  185. convert trashed kolster k20 into tube amp?
  186. Junkbox Hero
  187. KT150 curves by Sofia
  188. My new EL84 Amp
  189. 1955 Bogen J330 Mic Input Problem
  190. parallel el84 output pp. shared coupling caps?
  191. Will a Western Electric 422A substitute for a 5Y3?
  192. Question for a moderator
  193. bottlehead quickie schematic
  194. RCA 6146B sub for 807 or 6L6?
  195. Leak monoblock hum
  196. Eico 2036
  197. Heathkit iT-12 signal tracer to much gain??
  198. Valve Monoblocks - am I being realistic?
  199. Aikido Headphone Amp and PS1 Power supply
  200. Transforming a triode into a pentode?
  201. New to amps - Long-tail pair and heater hum
  202. Experimenting with the Aikido 12Vac kit
  203. Strategies for Implementing Negative Feedback in a 12ax7 Line Amplifier
  204. Output Transformer Impedances
  205. PP 6l6 class ab...advice needed
  206. 300B
  207. 12AX7 EL34B TUBE AMPLIFIER
  208. UK info please
  209. PAS 2/3 RIAA Modification
  210. My Homage to the Earmax Headphone Amp
  211. Aikio Line Stage
  212. Lite Audio LS 58 schematic
  213. Lite Audio LS 58 schematic
  214. Love those triodes
  215. Differential Pair with negative feedback
  216. Quad II Eighty Schematic?
  217. Adventures with Aikido
  218. Beard BB 100 and Beard A35
  219. Noob is about to press the BIN button and buy a Chinese tube amp kit. Save me/ help?
  220. Ebay Kit EL34 6n9P 5Z3P Build Thread.
  221. Sakuma 46 / 801A Circuit
  222. Tube Manufacturing at Expo-Pul
  223. Philips EL6410, how does it sound?
  224. tube amp power help
  225. Video from the Czech Tesla Tube factory
  226. Alans' rantings
  227. 3 x 3 Tube amp 30 watts
  228. Maximum allowed capacitance after gas rectifiers
  229. PSUD2 rectifiers list
  230. EL34 amplifier with these transformers
  231. Aikido Octal Dual Mono for Dummies... Help me.
  232. Monster Trans or Really Good Doorstop?
  233. The correct way to wire DC filaments 3B7 DHT
  234. Haller Circuit Problems
  235. Need recommendation for VERY basic amp project
  236. Recommendation on tube buffer?
  237. For Your Consideration: Unity Coupled Plitron Amp, No Bootstrapped Driver, No GNF
  238. Tango Transformers - any unique push pull circuits?
  239. newbe at designing tube amp
  240. Need help with microphone preamp.
  241. Trouble shooting vintage Harman Kardon A250
  242. Coating on Hammond Power Transformer
  243. Small tube amp for PC
  244. CCS dissipation
  245. 6SL7 - grid stopper values
  246. HELP - Laying out footprint for 9 pin tube socket
  247. Telefunken Magnetophon 104 - Keep or strip?
  248. Transformer rewinding or repair needed.
  249. Sun Audio in the USA?
  250. Wyetech Opal 6SN7 tube preamp, any DIY kit sound even close?

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