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  1. Tube Tracer
  2. a question of tube behaviour
  3. Which tube? ECC82, 6SN7 or 6SL7
  4. oscillator
  5. The Covi Mark II Circlotron Amp
  6. HT transformers and polarity
  7. Hammond 156C - good Plate choke load??
  8. Music Man sixtyfive reverb head needs help!
  9. DIY pre-amp kit vote
  10. 6550 tubes
  11. Is the 6N6P a direct substitute for the 5687?
  12. SE amp using 1619 instead of 45 triode
  13. Akai M-7 Amp Schematics?
  14. asl 845 monos mods
  15. 3 stages... Two Power Supplies
  16. RCA 7094 tetrodes...
  17. KT88 push pull
  18. Tube amp fan?
  19. Ping gerd.....
  20. Need help finding Sovtel EL84M tubes
  21. Min. current draw for choke input?
  22. Passive RIAA with tubes
  23. Oscillation Mystery
  24. unison research P30K schem?
  25. Can I use a 5R4 GY in place of a 5AR4?
  26. Seeking for all Norman H. Crowhurst papers
  27. best way to elevate heater?
  28. Tube Load Line
  29. Homemade Vacuum Tube
  30. beardm70mk2-want less b+
  31. Need help with tube test data - fast
  32. Show me a schema 6Pi3C-E Push-pull
  33. Help about the 6SN7/5692 linestage
  34. Active load output stage
  35. Power supply question
  36. EL34 Triode Mode - G3 where?
  37. Is "reforming" Electrolytic Capacitors necessary?
  38. Screen grid driver for PL519?
  39. Best replacment for a 6F2
  40. Please Tell Me How To Modify And Upgrade My Music Angle 845 Amplifier?
  41. Pentode to Triode trick.
  42. 6550 making a Popping sound?
  43. Pie-eyed and puzzled...
  44. How about this schematic
  45. tube disorder
  46. PC choke in a preamp ?
  47. selective tone control
  48. time for a laugh
  49. Another New Build Pictures ( G' Amp )
  50. Help finding: 7-pin PCB socket, 90deg horizontal
  51. LC vs. CLC Theory
  52. Input transformer & volume pot
  53. MC34-B Quit working suddenly (newb)
  54. Golden Tube Audio 300B se
  55. Wanted: Pioneer sa-810 schematic
  56. se el34 finally
  57. Tube design question
  58. Marantz 8 clone build
  59. Active RIAA Eq for tubes- Brian Clark's article
  60. pre hums - even unplugged!
  61. Push Pull Preamplifier anybody?
  62. 6AN8 tube question
  63. Distortion in Fisher 800C
  64. 20% versus 43% screen tap
  65. Van der Veen transformers
  66. Want to upgrade Velleman K8020
  67. KT88 Power supply question
  68. TX coupled, pentode linestage
  69. phase splitter question
  70. New preamp project is online
  71. Newbie: Which amps to build?
  72. Which valve, 5842 (417A) or 6H30
  73. How do you punch out your chassis holes?
  74. recommend a 5Y3 based bass guitar amp?
  75. Help identifying tube tester
  76. paralelled tube
  77. ECC88 at 12 volts
  78. azarus preamplifier schematics
  79. Which valve amp do I keep?
  80. Favorite Driver for 845
  81. Somebody has that magazine?
  82. modify parallel push-pull EL84 to single push-pull
  83. How long it will last?
  84. Hurricane Wilma
  85. Suddenly, no output from Copland CTA-501
  86. 807 Audio Amp Progress Report
  87. Choke induced Hum
  88. Wim's DC EL84 amp
  89. Drivers for a KT88 pair
  90. what do u think of these tubes?
  91. 12BH7 spice 3f4 model
  92. Clone Marantz M7 Line Amp
  93. PIO caps question
  94. New Build Pics (guitar Amp)
  95. 6HF5 sweep tube single ended amp
  96. My first DIY
  97. Winding A Interstage Transformer
  98. help building 12ax7/el84 amp
  99. PSE schematic
  100. Using PSU Designer to calculate DC filament supply
  101. Dynaco stereo 70 driver board
  102. Excellent and cheap DIY INTERSTAGE!
  103. Need Advice with Timer Relay Shut Off
  104. standby switch
  105. Purpose of small cap across PSU rails?
  106. 6SL7 + EL34 SE Audio Amp
  107. guitar tube amp as home stereo
  108. 6C33 fixed/auto bias ?
  109. Long Tail and Local feedback
  110. I look for EAR 859 pictures.
  111. Designing a simple tube opamp?
  112. Difference between Hammond 200 and 300 series
  113. Ultrapath Cap
  114. where to find 600v 18awg wire??
  115. Suggested power supply B+?
  116. Variable Impedence Mic Preamp
  117. Help me stop my preamp from farting!
  118. Just bought some of those Russian paper/oil caps off of ebay
  119. The Valhalla power amplifier project
  120. help! EL84's dying
  121. Could check this pentode-mu stage thingy for me (disclaimer* it is for a gutar amp)
  122. ASC Polypropylene And Oil Capacitors
  123. pots... log or linear?
  124. Cracking sound through speakers.
  125. EL84-PP - Why just 5W?
  126. Brook12a schematics...
  127. LongTailedPair gain -> how to calculate?
  128. Wiring secondaries of two power trafo's in parallel?
  129. RIAA "Tube Simulations"
  130. Has anyone built this 'Svetlana Six Pack' ?
  131. updated pics of tube project
  132. help 12FV7 datasheet
  133. Why does my oversized preamp trafo gets much too hot?!?!?
  134. 6sn7 pre
  135. 12AY7/6SN7 preamp PSU check
  136. CT design trans application
  137. Shindo schematics?
  138. Octal Hagerman Cornet Experiences
  139. My first (guitar) amplifier
  140. Zenith AM/FM C835 tube Radio schematic
  141. Oh man, my telefunken stoops...
  142. 42 single ended
  143. EL34 Feedback circuit
  144. Spice model for EL86/6CW5
  145. Ditching some High Voltage
  146. Newbie want to build simple tube preamp&psu!need help!
  147. Phono Pre-Design Input
  148. HV Direct Drive tube amp.
  149. A question about Cathodyne/split load/concertina PI's
  150. Kofi Annan in: "Hummin' Trafo Blues"
  151. Rattling Tube
  152. Berning output buffer
  153. Tube PSU Question
  154. JoLida Envoy PreAmp or DIY?
  155. Looking for Audio Note P1SE schematics.
  156. Which SE-ECL82 amp to build?
  157. PSU Help
  158. Help for stabilisator Data
  159. How much ripple on B+ is allowed?
  160. Typical 2A3 hum?
  161. PV10 PS transformer
  162. 300B Filament Voltage Range
  163. Mullard EL34-Authenticity Verification
  164. Fading or Frying Fender Clone Issue
  165. Philips V30M amplifier
  166. PWM power supply???
  167. Regulated psu for tube preamp
  168. About to start a new project: PP 6CK4s...
  169. Komuro DC 300B crct w/ 50dht?
  170. Anyone out there try a SEPP OTL guitar amp??
  171. DIY speaker attenuator?
  172. So what are some good 7-pin, hi mu, low noise/microphonic tubes??
  173. Audio meet pics from this past weekend
  174. Audio Note M7 Line Preamp??
  175. PP 7591 amp
  176. Tube op amps
  177. Please tell me how to upgrade Music Angel KT88 amplifier?
  178. Do I want a fan?
  179. 3rd Aikido?
  180. More Questions about A.Wrights PP1C
  181. 7591s flashing on start-up?
  182. first amp build... wiring questions
  183. pentode aikido driver for 300b
  184. Question about single NOS triodes in cascode for fun
  185. oscillating PP EL84 amplifier
  186. 6H30P based cathode-follower schema kindly requested
  187. Cathode follower question
  188. Bunch of old parts, worth anything?
  189. 6922 vs. 6N1P Bass Response
  190. Behringer reaches a new high in tube "transparency"
  191. Input stage tube
  192. Using transformers as choke?
  193. Resistors
  194. melos gk1 preamps anybody?
  195. Looking for a thread...
  196. DG7-32 based oscillograph schematic needed
  197. Try!!! Ef37a + 6c33c
  198. qustion on tube grade wiring
  199. Balanced pre-amp attempt
  200. GRRR.. sanity check on PTx current please
  201. How do you measure ripple on the B+?
  202. Aikido + EL34 Integrated
  203. heater voltage: why ac, and not dc?
  204. Ideas for using one ECL82 in a preamp
  205. Question about 12AU7
  206. 6AU6, 6U8, 6CL6, plus UTC A-10 make Mic Pre?
  207. WIMA FKP1 1000V as coupling cap ??
  208. Ping amperex re: Hammond organs
  209. schematic needen variable power supply
  210. Distributed Load/Balanced Bridge Connection
  211. CCS, feedback and grid leak questions.
  212. Vdd
  213. Help with 6GW8/ECL86 tubes??
  214. Best amplifier (recomendations) for Fostex FE108ez?
  215. Quick valve construction question
  216. Poindexter's 6v6 PP amp
  217. need some help with Ohm's law-fast!
  218. hybrid rectifier question
  219. I really, really wish I hadn't done that...
  220. Quicksilver 8417 conversion
  221. Supratek
  222. remote OPT, stupid idea ?
  223. Autoformer output stage
  224. Remote Power Supply: A Stupid Idea?
  225. Rjm simple tube phono pre
  226. Voltage controlled filter with tubes ??
  227. Does this look right to you?
  228. PWM amplifier hooked onto a tube preamp
  229. Zenith Console Opt Question, Odd Secondary
  230. Marchand LN108 Tube Phono Preamp
  231. Anyone care to express an opinion on this output Transformer
  232. 6L6 Triode strapped amp suggestions
  233. 6F1 and 6P2 Equivalents
  234. in memoriam Fred N. AKA 807
  235. Perplexed by 5AR4 Tube Socket? Picture Included
  236. Push pull 300B and more than a few questions...
  237. First tube project.
  238. DHT learning
  239. how do i add adjustable bias on amp?
  240. Tube tester: Accurate Instruments Model 157
  241. "El Cheapo Valve Phono" using 6ER5=>12AT7WC?
  242. Design Questions
  243. SRPP + Gainclone
  244. dht p-p filament question
  245. Report - 2005 London HiFi Show
  246. Want to build hi - power amp
  247. Gibson Skylark Grouding Questions
  248. Can I mod this circuit to use 6922 tubes?
  249. tube preamp kit question (again?)
  250. 3f4 spice models needed

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