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  1. replace 6N1P with 7308
  2. Plate choke on a line stage?
  3. Looking for datasheet
  4. 811A SET Monoblock physical layout suggestions
  5. Automated bias
  6. OTL or parafeed?
  7. tubes: Jcm 900 Slx 50watt
  8. Reversing mains toroids for HT
  9. 5881/6L6WGC and 12AT7WA replacement
  10. Direction for Mounting Transformers
  11. Ecf80
  12. feedback phasing
  13. Cryotubes? Cryogenically Frozen valves
  14. European Triode Festival 2005
  15. PSU capacitors
  16. Question on shared rectifier / signal tube filament windings
  17. Heathkit rebuild or...?
  18. Fisher 500B OPT/Feedback Questions
  19. Transformer selection question
  20. Grounded Grid Help
  21. EF86 penthode
  22. Any audio use for ER21A?
  23. Upgrading a sonic frontiers SFS-80
  24. Hum problem
  25. low frequency oscillation in 12B4 linestage
  26. Balanced volume control question
  27. Need Help for Power Supply for gg Preamp
  28. OTL 6c33c Ciufolli v8.2 low voltage rails
  29. Any way to extend OPT low-frequency response?
  30. RCA Phono Stage Redux
  31. About tube codes
  32. More Joules? Tube or Solid State PSU?
  33. EL34 schematic confusion
  34. 2-stage DHT: high-mu vs. interstage stepup
  35. Understanding this power supply
  36. 6V6G recommended schematic
  37. parallel CRC Filtering for B+
  38. 6v6. 6lg Gain Max Voltage
  39. More buffer questions
  40. Benchtop PS
  41. Chassis labels
  42. LM317 Regulator Problem
  43. Can I afford my SE amp ??
  44. 12B4 versus 6S4 for linestage
  45. Function Generator Probe?
  46. Otl Set?
  47. Tektronix TDS2000 series is a noisy scope
  48. vanderveen's 30W PP amp..
  49. Roberts/Akai M series amp problems
  50. What speaker to use with my tube clone
  51. What’s the best tube amplifier you can build?
  52. Cathode Follower Buffer Input Impedance
  53. EL84 as Preamp and as Crossover
  54. Wondering if Upcoming DIY design will work with Tubes? Cheap DIY Kits?
  55. EL 84 Single Ended Integrated
  56. "2 Stage" PP 7591 Amp
  57. Jolida 1301a with Mission M71 speakers?
  58. EL34 SE in 430V?
  59. EL 84 PPP/PP Class A Triode schematic
  60. Almarro A318A
  61. beckman berkley model 7360
  62. spice model for UL output transformer?
  63. Need help with my new amp
  64. Motor caps
  65. E88CC Mullard fake
  66. Anyone try sharp cutoff pentodes in a p-p output stage?
  67. 845 A2 Monoblock Project
  68. newb needs help on simple el84 amp PS
  69. Newbie's power supply woes
  70. Question about M7 Preamp
  71. Which amp to DIY as a first project?
  72. help for psu
  73. tube amp
  74. Will a 6BH6 work in an Aikido?
  75. Tubes and maximum ratings
  76. FireFly Amp Question
  77. help needed 1st tube diy
  78. Help for newbie building Toccata preamp
  79. Diy Orange guitar amp
  80. Hybrid amp -> tube for VAS stage
  81. I recently inherited a Heathkit HO-10 monitor o-scope...
  82. Laney PA amp help!
  83. Aikido tube choice
  84. Biasing pre-amp problem
  85. Help with identifying tube
  86. Off Topic Holiday Cheer
  87. Prototype preamp example
  88. PV10AL Transformer burned, help!
  89. EL34 Pentode in Push-Pull!
  90. Mcintosh MX110 repair
  91. Mains Transformer Question
  92. Loaded Question
  93. A BIG SCRATCH in my speakers? Help me please.
  94. New Production Tung Sol 6550 Tubes - Opinions
  95. Looking to build a tube integrated
  96. Which high power CCS for output stage?
  97. Using a mosfet to drop B+?
  98. drawings vs. schematics
  99. New TEK Scopes
  100. Transfos Anyone?
  101. Ripple guidelines for power supplies
  102. Mains transformer orientation
  103. New Nightmare (Guitar Amp)
  104. AMD tube integrated tube amp
  105. Using Choke in LCRC filter in power supply
  106. Need good current sink JFET or MOSFET?
  107. Setting Up a Circuit for Testing
  108. 6H6 question
  109. Kennedy Tube Audio Website Hijacked
  110. Yet another 12B4 line stage, or is the 12B4 better than the Grounded Grid.....
  111. transformer for Philips AG9015
  112. Real McTube Help
  113. Where are the 307A / VT225 amps?
  114. Anyone have a single el84 PPP OPT?
  115. Finished First Guitar Amp
  116. Using an old power transformer as a choke?
  117. Convergent Audio Technology SL-1 Scematics
  118. Poinz 6AQ5 Linestage
  119. microphone preamp
  120. Ticking noise, need help.
  121. Humm in my preamp...
  122. Enclosure suggestion/questions
  123. Calculating Tube Parameters +SPICE
  124. Loudspeaker for TUBE DIYer
  125. Tube ID 18R-AL1?
  126. 6l6gc Tube Drive
  127. Need a little help, TT and PC? Amp Kit?
  128. 12ax7 preamp
  129. 308/ecll800 Lorenz
  130. How did you do your Aikido?
  131. Thoughts on this 807 design
  132. Rectifier compatibilty
  133. Tube amp for biamped speaker
  134. 12ae6, 12fk6, 12fm6 diode specs
  135. Any software out there for taking the headache out of composite loadlines?
  136. Driving a single 6L6GC with 12AX7
  137. quick 50c5 to play around with
  138. A question about distortion in SE vs. PP designs:
  139. Need help on first tube amp rebuild -trans problems
  140. HAMMOND 125ESE Transformer WIRING
  141. preamp ps problem
  142. What does everybody really NEED???
  143. Marantz 7C still good today?
  144. Magnavox Chassis #196-55 Resistor Question
  145. 6BL7
  146. altec/peerless mystery amp
  147. 6gk8 triode pentode tube data
  148. Low Current Source
  149. Parallel Single-Ended Questions
  150. Tube power ratings
  151. 6DJ8 or 12xx7 for hybrid amp (Monarchy)
  152. What did I do wrong with LEGACY????
  153. seeking: tube for a SEP parallel feed like an EL84, but with a lower Ra
  154. Tube Tracer
  155. a question of tube behaviour
  156. Which tube? ECC82, 6SN7 or 6SL7
  157. oscillator
  158. The Covi Mark II Circlotron Amp
  159. HT transformers and polarity
  160. Hammond 156C - good Plate choke load??
  161. Music Man sixtyfive reverb head needs help!
  162. DIY pre-amp kit vote
  163. 6550 tubes
  164. Is the 6N6P a direct substitute for the 5687?
  165. SE amp using 1619 instead of 45 triode
  166. Akai M-7 Amp Schematics?
  167. asl 845 monos mods
  168. 3 stages... Two Power Supplies
  169. RCA 7094 tetrodes...
  170. KT88 push pull
  171. Tube amp fan?
  172. Ping gerd.....
  173. Need help finding Sovtel EL84M tubes
  174. Min. current draw for choke input?
  175. Passive RIAA with tubes
  176. Oscillation Mystery
  177. unison research P30K schem?
  178. Can I use a 5R4 GY in place of a 5AR4?
  179. Seeking for all Norman H. Crowhurst papers
  180. best way to elevate heater?
  181. Tube Load Line
  182. Homemade Vacuum Tube
  183. beardm70mk2-want less b+
  184. Need help with tube test data - fast
  185. Show me a schema 6Pi3C-E Push-pull
  186. Help about the 6SN7/5692 linestage
  187. Active load output stage
  188. Power supply question
  189. EL34 Triode Mode - G3 where?
  190. Is "reforming" Electrolytic Capacitors necessary?
  191. Screen grid driver for PL519?
  192. Best replacment for a 6F2
  193. Please Tell Me How To Modify And Upgrade My Music Angle 845 Amplifier?
  194. Pentode to Triode trick.
  195. 6550 making a Popping sound?
  196. Pie-eyed and puzzled...
  197. How about this schematic
  198. tube disorder
  199. PC choke in a preamp ?
  200. selective tone control
  201. time for a laugh
  202. Another New Build Pictures ( G' Amp )
  203. Help finding: 7-pin PCB socket, 90deg horizontal
  204. LC vs. CLC Theory
  205. Input transformer & volume pot
  206. MC34-B Quit working suddenly (newb)
  207. Golden Tube Audio 300B se
  208. Wanted: Pioneer sa-810 schematic
  209. se el34 finally
  210. Tube design question
  211. Marantz 8 clone build
  212. Active RIAA Eq for tubes- Brian Clark's article
  213. pre hums - even unplugged!
  214. Push Pull Preamplifier anybody?
  215. 6AN8 tube question
  216. Distortion in Fisher 800C
  217. 20% versus 43% screen tap
  218. Van der Veen transformers
  219. Want to upgrade Velleman K8020
  220. KT88 Power supply question
  221. TX coupled, pentode linestage
  222. phase splitter question
  223. New preamp project is online
  224. Newbie: Which amps to build?
  225. Which valve, 5842 (417A) or 6H30
  226. How do you punch out your chassis holes?
  227. recommend a 5Y3 based bass guitar amp?
  228. Help identifying tube tester
  229. paralelled tube
  230. ECC88 at 12 volts
  231. azarus preamplifier schematics
  232. Which valve amp do I keep?
  233. Favorite Driver for 845
  234. Somebody has that magazine?
  235. modify parallel push-pull EL84 to single push-pull
  236. How long it will last?
  237. Hurricane Wilma
  238. Suddenly, no output from Copland CTA-501
  239. 807 Audio Amp Progress Report
  240. Choke induced Hum
  241. Wim's DC EL84 amp
  242. Drivers for a KT88 pair
  243. what do u think of these tubes?
  244. 12BH7 spice 3f4 model
  245. Clone Marantz M7 Line Amp
  246. PIO caps question
  247. New Build Pics (guitar Amp)
  248. 6HF5 sweep tube single ended amp
  249. My first DIY
  250. Winding A Interstage Transformer

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