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  1. Transformer selection question
  2. Grounded Grid Help
  3. EF86 penthode
  4. Any audio use for ER21A?
  5. Upgrading a sonic frontiers SFS-80
  6. Hum problem
  7. low frequency oscillation in 12B4 linestage
  8. Balanced volume control question
  9. Need Help for Power Supply for gg Preamp
  10. OTL 6c33c Ciufolli v8.2 low voltage rails
  11. Any way to extend OPT low-frequency response?
  12. RCA Phono Stage Redux
  13. About tube codes
  14. More Joules? Tube or Solid State PSU?
  15. EL34 schematic confusion
  16. 2-stage DHT: high-mu vs. interstage stepup
  17. Understanding this power supply
  18. 6V6G recommended schematic
  19. parallel CRC Filtering for B+
  20. 6v6. 6lg Gain Max Voltage
  21. More buffer questions
  22. Benchtop PS
  23. Chassis labels
  24. LM317 Regulator Problem
  25. Can I afford my SE amp ??
  26. 12B4 versus 6S4 for linestage
  27. Function Generator Probe?
  28. Otl Set?
  29. Tektronix TDS2000 series is a noisy scope
  30. vanderveen's 30W PP amp..
  31. Roberts/Akai M series amp problems
  32. What speaker to use with my tube clone
  33. What’s the best tube amplifier you can build?
  34. Cathode Follower Buffer Input Impedance
  35. EL84 as Preamp and as Crossover
  36. Wondering if Upcoming DIY design will work with Tubes? Cheap DIY Kits?
  37. EL 84 Single Ended Integrated
  38. "2 Stage" PP 7591 Amp
  39. Jolida 1301a with Mission M71 speakers?
  40. EL34 SE in 430V?
  41. EL 84 PPP/PP Class A Triode schematic
  42. Almarro A318A
  43. beckman berkley model 7360
  44. spice model for UL output transformer?
  45. Need help with my new amp
  46. Motor caps
  47. E88CC Mullard fake
  48. Anyone try sharp cutoff pentodes in a p-p output stage?
  49. 845 A2 Monoblock Project
  50. newb needs help on simple el84 amp PS
  51. Newbie's power supply woes
  52. Question about M7 Preamp
  53. Which amp to DIY as a first project?
  54. help for psu
  55. tube amp
  56. Will a 6BH6 work in an Aikido?
  57. Tubes and maximum ratings
  58. FireFly Amp Question
  59. help needed 1st tube diy
  60. Help for newbie building Toccata preamp
  61. Diy Orange guitar amp
  62. Hybrid amp -> tube for VAS stage
  63. I recently inherited a Heathkit HO-10 monitor o-scope...
  64. Laney PA amp help!
  65. Aikido tube choice
  66. Biasing pre-amp problem
  67. Help with identifying tube
  68. Off Topic Holiday Cheer
  69. Prototype preamp example
  70. PV10AL Transformer burned, help!
  71. EL34 Pentode in Push-Pull!
  72. Mcintosh MX110 repair
  73. Mains Transformer Question
  74. Loaded Question
  75. A BIG SCRATCH in my speakers? Help me please.
  76. New Production Tung Sol 6550 Tubes - Opinions
  77. Looking to build a tube integrated
  78. Which high power CCS for output stage?
  79. Using a mosfet to drop B+?
  80. drawings vs. schematics
  81. New TEK Scopes
  82. Transfos Anyone?
  83. Ripple guidelines for power supplies
  84. Mains transformer orientation
  85. New Nightmare (Guitar Amp)
  86. AMD tube integrated tube amp
  87. Using Choke in LCRC filter in power supply
  88. Need good current sink JFET or MOSFET?
  89. Setting Up a Circuit for Testing
  90. 6H6 question
  91. Kennedy Tube Audio Website Hijacked
  92. Yet another 12B4 line stage, or is the 12B4 better than the Grounded Grid.....
  93. transformer for Philips AG9015
  94. Real McTube Help
  95. Where are the 307A / VT225 amps?
  96. Anyone have a single el84 PPP OPT?
  97. Finished First Guitar Amp
  98. Using an old power transformer as a choke?
  99. Convergent Audio Technology SL-1 Scematics
  100. Poinz 6AQ5 Linestage
  101. microphone preamp
  102. Ticking noise, need help.
  103. Humm in my preamp...
  104. Enclosure suggestion/questions
  105. Calculating Tube Parameters +SPICE
  106. Loudspeaker for TUBE DIYer
  107. Tube ID 18R-AL1?
  108. 6l6gc Tube Drive
  109. Need a little help, TT and PC? Amp Kit?
  110. 12ax7 preamp
  111. 308/ecll800 Lorenz
  112. How did you do your Aikido?
  113. Thoughts on this 807 design
  114. Rectifier compatibilty
  115. Tube amp for biamped speaker
  116. 12ae6, 12fk6, 12fm6 diode specs
  117. Any software out there for taking the headache out of composite loadlines?
  118. Driving a single 6L6GC with 12AX7
  119. quick 50c5 to play around with
  120. A question about distortion in SE vs. PP designs:
  121. Need help on first tube amp rebuild -trans problems
  122. HAMMOND 125ESE Transformer WIRING
  123. preamp ps problem
  124. What does everybody really NEED???
  125. Marantz 7C still good today?
  126. Magnavox Chassis #196-55 Resistor Question
  127. 6BL7
  128. altec/peerless mystery amp
  129. 6gk8 triode pentode tube data
  130. Low Current Source
  131. Parallel Single-Ended Questions
  132. Tube power ratings
  133. 6DJ8 or 12xx7 for hybrid amp (Monarchy)
  134. What did I do wrong with LEGACY????
  135. seeking: tube for a SEP parallel feed like an EL84, but with a lower Ra
  136. Tube Tracer
  137. a question of tube behaviour
  138. Which tube? ECC82, 6SN7 or 6SL7
  139. oscillator
  140. The Covi Mark II Circlotron Amp
  141. HT transformers and polarity
  142. Hammond 156C - good Plate choke load??
  143. Music Man sixtyfive reverb head needs help!
  144. DIY pre-amp kit vote
  145. 6550 tubes
  146. Is the 6N6P a direct substitute for the 5687?
  147. SE amp using 1619 instead of 45 triode
  148. Akai M-7 Amp Schematics?
  149. asl 845 monos mods
  150. 3 stages... Two Power Supplies
  151. RCA 7094 tetrodes...
  152. KT88 push pull
  153. Tube amp fan?
  154. Ping gerd.....
  155. Need help finding Sovtel EL84M tubes
  156. Min. current draw for choke input?
  157. Passive RIAA with tubes
  158. Oscillation Mystery
  159. unison research P30K schem?
  160. Can I use a 5R4 GY in place of a 5AR4?
  161. Seeking for all Norman H. Crowhurst papers
  162. best way to elevate heater?
  163. Tube Load Line
  164. Homemade Vacuum Tube
  165. beardm70mk2-want less b+
  166. Need help with tube test data - fast
  167. Show me a schema 6Pi3C-E Push-pull
  168. Help about the 6SN7/5692 linestage
  169. Active load output stage
  170. Power supply question
  171. EL34 Triode Mode - G3 where?
  172. Is "reforming" Electrolytic Capacitors necessary?
  173. Screen grid driver for PL519?
  174. Best replacment for a 6F2
  175. Please Tell Me How To Modify And Upgrade My Music Angle 845 Amplifier?
  176. Pentode to Triode trick.
  177. 6550 making a Popping sound?
  178. Pie-eyed and puzzled...
  179. How about this schematic
  180. tube disorder
  181. PC choke in a preamp ?
  182. selective tone control
  183. time for a laugh
  184. Another New Build Pictures ( G' Amp )
  185. Help finding: 7-pin PCB socket, 90deg horizontal
  186. LC vs. CLC Theory
  187. Input transformer & volume pot
  188. MC34-B Quit working suddenly (newb)
  189. Golden Tube Audio 300B se
  190. Wanted: Pioneer sa-810 schematic
  191. se el34 finally
  192. Tube design question
  193. Marantz 8 clone build
  194. Active RIAA Eq for tubes- Brian Clark's article
  195. pre hums - even unplugged!
  196. Push Pull Preamplifier anybody?
  197. 6AN8 tube question
  198. Distortion in Fisher 800C
  199. 20% versus 43% screen tap
  200. Van der Veen transformers
  201. Want to upgrade Velleman K8020
  202. KT88 Power supply question
  203. TX coupled, pentode linestage
  204. phase splitter question
  205. New preamp project is online
  206. Newbie: Which amps to build?
  207. Which valve, 5842 (417A) or 6H30
  208. How do you punch out your chassis holes?
  209. recommend a 5Y3 based bass guitar amp?
  210. Help identifying tube tester
  211. paralelled tube
  212. ECC88 at 12 volts
  213. azarus preamplifier schematics
  214. Which valve amp do I keep?
  215. Favorite Driver for 845
  216. Somebody has that magazine?
  217. modify parallel push-pull EL84 to single push-pull
  218. How long it will last?
  219. Hurricane Wilma
  220. Suddenly, no output from Copland CTA-501
  221. 807 Audio Amp Progress Report
  222. Choke induced Hum
  223. Wim's DC EL84 amp
  224. Drivers for a KT88 pair
  225. what do u think of these tubes?
  226. 12BH7 spice 3f4 model
  227. Clone Marantz M7 Line Amp
  228. PIO caps question
  229. New Build Pics (guitar Amp)
  230. 6HF5 sweep tube single ended amp
  231. My first DIY
  232. Winding A Interstage Transformer
  233. help building 12ax7/el84 amp
  234. PSE schematic
  235. Using PSU Designer to calculate DC filament supply
  236. Dynaco stereo 70 driver board
  237. Excellent and cheap DIY INTERSTAGE!
  238. Need Advice with Timer Relay Shut Off
  239. standby switch
  240. Purpose of small cap across PSU rails?
  241. 6SL7 + EL34 SE Audio Amp
  242. guitar tube amp as home stereo
  243. 6C33 fixed/auto bias ?
  244. Long Tail and Local feedback
  245. I look for EAR 859 pictures.
  246. Designing a simple tube opamp?
  247. Difference between Hammond 200 and 300 series
  248. Ultrapath Cap
  249. where to find 600v 18awg wire??
  250. Suggested power supply B+?

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