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  1. Heathkit rebuild or...?
  2. Fisher 500B OPT/Feedback Questions
  3. Transformer selection question
  4. Grounded Grid Help
  5. EF86 penthode
  6. Any audio use for ER21A?
  7. Upgrading a sonic frontiers SFS-80
  8. Hum problem
  9. low frequency oscillation in 12B4 linestage
  10. Balanced volume control question
  11. Need Help for Power Supply for gg Preamp
  12. OTL 6c33c Ciufolli v8.2 low voltage rails
  13. Any way to extend OPT low-frequency response?
  14. RCA Phono Stage Redux
  15. About tube codes
  16. More Joules? Tube or Solid State PSU?
  17. EL34 schematic confusion
  18. 2-stage DHT: high-mu vs. interstage stepup
  19. Understanding this power supply
  20. 6V6G recommended schematic
  21. parallel CRC Filtering for B+
  22. 6v6. 6lg Gain Max Voltage
  23. More buffer questions
  24. Benchtop PS
  25. Chassis labels
  26. LM317 Regulator Problem
  27. Can I afford my SE amp ??
  28. 12B4 versus 6S4 for linestage
  29. Function Generator Probe?
  30. Otl Set?
  31. Tektronix TDS2000 series is a noisy scope
  32. vanderveen's 30W PP amp..
  33. Roberts/Akai M series amp problems
  34. What speaker to use with my tube clone
  35. What’s the best tube amplifier you can build?
  36. Cathode Follower Buffer Input Impedance
  37. EL84 as Preamp and as Crossover
  38. Wondering if Upcoming DIY design will work with Tubes? Cheap DIY Kits?
  39. EL 84 Single Ended Integrated
  40. "2 Stage" PP 7591 Amp
  41. Jolida 1301a with Mission M71 speakers?
  42. EL34 SE in 430V?
  43. EL 84 PPP/PP Class A Triode schematic
  44. Almarro A318A
  45. beckman berkley model 7360
  46. spice model for UL output transformer?
  47. Need help with my new amp
  48. Motor caps
  49. E88CC Mullard fake
  50. Anyone try sharp cutoff pentodes in a p-p output stage?
  51. 845 A2 Monoblock Project
  52. newb needs help on simple el84 amp PS
  53. Newbie's power supply woes
  54. Question about M7 Preamp
  55. Which amp to DIY as a first project?
  56. help for psu
  57. tube amp
  58. Will a 6BH6 work in an Aikido?
  59. Tubes and maximum ratings
  60. FireFly Amp Question
  61. help needed 1st tube diy
  62. Help for newbie building Toccata preamp
  63. Diy Orange guitar amp
  64. Hybrid amp -> tube for VAS stage
  65. I recently inherited a Heathkit HO-10 monitor o-scope...
  66. Laney PA amp help!
  67. Aikido tube choice
  68. Biasing pre-amp problem
  69. Help with identifying tube
  70. Off Topic Holiday Cheer
  71. Prototype preamp example
  72. PV10AL Transformer burned, help!
  73. EL34 Pentode in Push-Pull!
  74. Mcintosh MX110 repair
  75. Mains Transformer Question
  76. Loaded Question
  77. A BIG SCRATCH in my speakers? Help me please.
  78. New Production Tung Sol 6550 Tubes - Opinions
  79. Looking to build a tube integrated
  80. Which high power CCS for output stage?
  81. Using a mosfet to drop B+?
  82. drawings vs. schematics
  83. New TEK Scopes
  84. Transfos Anyone?
  85. Ripple guidelines for power supplies
  86. Mains transformer orientation
  87. New Nightmare (Guitar Amp)
  88. AMD tube integrated tube amp
  89. Using Choke in LCRC filter in power supply
  90. Need good current sink JFET or MOSFET?
  91. Setting Up a Circuit for Testing
  92. 6H6 question
  93. Kennedy Tube Audio Website Hijacked
  94. Yet another 12B4 line stage, or is the 12B4 better than the Grounded Grid.....
  95. transformer for Philips AG9015
  96. Real McTube Help
  97. Where are the 307A / VT225 amps?
  98. Anyone have a single el84 PPP OPT?
  99. Finished First Guitar Amp
  100. Using an old power transformer as a choke?
  101. Convergent Audio Technology SL-1 Scematics
  102. Poinz 6AQ5 Linestage
  103. microphone preamp
  104. Ticking noise, need help.
  105. Humm in my preamp...
  106. Enclosure suggestion/questions
  107. Calculating Tube Parameters +SPICE
  108. Loudspeaker for TUBE DIYer
  109. Tube ID 18R-AL1?
  110. 6l6gc Tube Drive
  111. Need a little help, TT and PC? Amp Kit?
  112. 12ax7 preamp
  113. 308/ecll800 Lorenz
  114. How did you do your Aikido?
  115. Thoughts on this 807 design
  116. Rectifier compatibilty
  117. Tube amp for biamped speaker
  118. 12ae6, 12fk6, 12fm6 diode specs
  119. Any software out there for taking the headache out of composite loadlines?
  120. Driving a single 6L6GC with 12AX7
  121. quick 50c5 to play around with
  122. A question about distortion in SE vs. PP designs:
  123. Need help on first tube amp rebuild -trans problems
  124. HAMMOND 125ESE Transformer WIRING
  125. preamp ps problem
  126. What does everybody really NEED???
  127. Marantz 7C still good today?
  128. Magnavox Chassis #196-55 Resistor Question
  129. 6BL7
  130. altec/peerless mystery amp
  131. 6gk8 triode pentode tube data
  132. Low Current Source
  133. Parallel Single-Ended Questions
  134. Tube power ratings
  135. 6DJ8 or 12xx7 for hybrid amp (Monarchy)
  136. What did I do wrong with LEGACY????
  137. seeking: tube for a SEP parallel feed like an EL84, but with a lower Ra
  138. Tube Tracer
  139. a question of tube behaviour
  140. Which tube? ECC82, 6SN7 or 6SL7
  141. oscillator
  142. The Covi Mark II Circlotron Amp
  143. HT transformers and polarity
  144. Hammond 156C - good Plate choke load??
  145. Music Man sixtyfive reverb head needs help!
  146. DIY pre-amp kit vote
  147. 6550 tubes
  148. Is the 6N6P a direct substitute for the 5687?
  149. SE amp using 1619 instead of 45 triode
  150. Akai M-7 Amp Schematics?
  151. asl 845 monos mods
  152. 3 stages... Two Power Supplies
  153. RCA 7094 tetrodes...
  154. KT88 push pull
  155. Tube amp fan?
  156. Ping gerd.....
  157. Need help finding Sovtel EL84M tubes
  158. Min. current draw for choke input?
  159. Passive RIAA with tubes
  160. Oscillation Mystery
  161. unison research P30K schem?
  162. Can I use a 5R4 GY in place of a 5AR4?
  163. Seeking for all Norman H. Crowhurst papers
  164. best way to elevate heater?
  165. Tube Load Line
  166. Homemade Vacuum Tube
  167. beardm70mk2-want less b+
  168. Need help with tube test data - fast
  169. Show me a schema 6Pi3C-E Push-pull
  170. Help about the 6SN7/5692 linestage
  171. Active load output stage
  172. Power supply question
  173. EL34 Triode Mode - G3 where?
  174. Is "reforming" Electrolytic Capacitors necessary?
  175. Screen grid driver for PL519?
  176. Best replacment for a 6F2
  177. Please Tell Me How To Modify And Upgrade My Music Angle 845 Amplifier?
  178. Pentode to Triode trick.
  179. 6550 making a Popping sound?
  180. Pie-eyed and puzzled...
  181. How about this schematic
  182. tube disorder
  183. PC choke in a preamp ?
  184. selective tone control
  185. time for a laugh
  186. Another New Build Pictures ( G' Amp )
  187. Help finding: 7-pin PCB socket, 90deg horizontal
  188. LC vs. CLC Theory
  189. Input transformer & volume pot
  190. MC34-B Quit working suddenly (newb)
  191. Golden Tube Audio 300B se
  192. Wanted: Pioneer sa-810 schematic
  193. se el34 finally
  194. Tube design question
  195. Marantz 8 clone build
  196. Active RIAA Eq for tubes- Brian Clark's article
  197. pre hums - even unplugged!
  198. Push Pull Preamplifier anybody?
  199. 6AN8 tube question
  200. Distortion in Fisher 800C
  201. 20% versus 43% screen tap
  202. Van der Veen transformers
  203. Want to upgrade Velleman K8020
  204. KT88 Power supply question
  205. TX coupled, pentode linestage
  206. phase splitter question
  207. New preamp project is online
  208. Newbie: Which amps to build?
  209. Which valve, 5842 (417A) or 6H30
  210. How do you punch out your chassis holes?
  211. recommend a 5Y3 based bass guitar amp?
  212. Help identifying tube tester
  213. paralelled tube
  214. ECC88 at 12 volts
  215. azarus preamplifier schematics
  216. Which valve amp do I keep?
  217. Favorite Driver for 845
  218. Somebody has that magazine?
  219. modify parallel push-pull EL84 to single push-pull
  220. How long it will last?
  221. Hurricane Wilma
  222. Suddenly, no output from Copland CTA-501
  223. 807 Audio Amp Progress Report
  224. Choke induced Hum
  225. Wim's DC EL84 amp
  226. Drivers for a KT88 pair
  227. what do u think of these tubes?
  228. 12BH7 spice 3f4 model
  229. Clone Marantz M7 Line Amp
  230. PIO caps question
  231. New Build Pics (guitar Amp)
  232. 6HF5 sweep tube single ended amp
  233. My first DIY
  234. Winding A Interstage Transformer
  235. help building 12ax7/el84 amp
  236. PSE schematic
  237. Using PSU Designer to calculate DC filament supply
  238. Dynaco stereo 70 driver board
  239. Excellent and cheap DIY INTERSTAGE!
  240. Need Advice with Timer Relay Shut Off
  241. standby switch
  242. Purpose of small cap across PSU rails?
  243. 6SL7 + EL34 SE Audio Amp
  244. guitar tube amp as home stereo
  245. 6C33 fixed/auto bias ?
  246. Long Tail and Local feedback
  247. I look for EAR 859 pictures.
  248. Designing a simple tube opamp?
  249. Difference between Hammond 200 and 300 series
  250. Ultrapath Cap

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