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  1. Sanity of compactron for "integrated" headphone amp?
  2. HELP - SMART 845 or 300B SE
  3. DC Servo - Direct Coupling Applications?
  4. Edison 12 amplifier
  5. 6C33C tube socket for GM70 tube??
  6. Fisher X100C 2 sets speakers?
  7. 4P1L DHT Line Stage
  8. Trying to identify an old radio tube
  9. Yaqin CD3 upgrading caps help for novice
  10. push pull adjustable fixed bias
  11. Another SE amp design.
  12. Ray Butts Echosonic #27
  13. What coupling capacitor values are common
  14. Yamamoto A-09s
  15. 9001 variant of Acorn 954 Pentode
  16. Grounding the 4ohm tap
  17. Rectifier mechanical buzz
  18. Informed opinion(s) on phase inversion?
  19. Strange problem with Grundig CS200 tube receiver
  20. Puresound P10 RIAA
  21. Need help on DIY Toccata Phono Preamp
  22. Single 6EB8 tube kit?
  23. SE OPT as PS choke
  24. Best input DHT tube?
  25. Hm, which order to replace 2 out of 4 tubes?
  26. EL34 Musical Machine Output XFMR suggestions
  27. Driver stage to finals newbie questions - (I hope not dumb questions)
  28. Preamp with single 12ax7 Ecc83 for stereo?
  29. Ming-Da MC-300B845 schematic needed
  30. My RH84 Build - first amp after a 25 year break -:)
  31. Jolida 502a Snubber Mod
  32. Again
  33. KT120, PSE
  34. 6v6 bias with cathodyne
  35. How did the "magic eye" work on old valve radios ?
  36. High voltage switching
  37. High voltage switching
  38. EF184 as ccs / design questions / spice model
  39. ECC807
  40. Compactron 6C10 & 6Q11/6K11 tube data
  41. Reverse Engineering leads from Tube amp
  42. Did you all see this??
  43. WESTREX 60 WATT AMP
  44. Johari's audio system
  45. el95 single ended amp project needs help with preamp
  46. 3 ways active crossover
  47. 5691 tube tonal balance
  48. Dynaco Mark III chassis
  49. Stancor A-8053 Output Transformer - opinions wanted!
  50. Nice OPT's for headphone amp...
  51. Eimac 304TH anode question
  52. Is WE310A > 45 > 300B PP possible?
  53. Aikido 5687 PCB - Headphone and C3
  54. Tube RIAA(something easy)
  55. Testing power pentodes
  56. NTC THERMISTOR as SOFT START for TUBES
  57. NEW ARIA (MENG) MINI 6P1
  58. Basic schematic for Dodd Audio tube buffer?
  59. EL844
  60. Tube CAD?
  61. Cap Problem with philco 49-1401
  62. Music Angel
  63. Help 7189A Tubes!
  64. Bulb in cathode?
  65. Gain and volume pots - newbie question
  66. Resistor test TX7525 AMRG CMF55
  67. I think I made a mistake
  68. 12at7 and 12au7
  69. PSE KT88 using Mikael's basic schematic.....
  70. Mods Tube Amps/Pre-amp
  71. Help to find out what OPT are these
  72. LL1660 P PZ Lundahl interstage ringing problem GM70pp
  73. Adding Bal output to Akido
  74. Input impedance, the higher the better or not?
  75. Risk of DC coupled input with tube pre-amp ?
  76. UL Cascode phono
  77. DC Imbalance with the LTP
  78. More Wireless World articles archived
  79. Yaqin VK-2100 Static from one channel
  80. Direct Coupled, Self Biasing, CCS Loaded, 300B Amp
  81. Testing a 300A on a B&K
  82. Diodes to tube
  83. PL84/EL86 push pull
  84. circuit diagram
  85. Ultralinear operation
  86. 60hz hum in component system
  87. Crackling Amp
  88. Explanation wanted
  89. Dynaco FM1 stereo updating ?
  90. tube amp diy off. Is this a good deal?
  91. SE driver
  92. DN2540 + LM317 cascode CCS?
  93. Recapping old tube amp
  94. How a SRPP stage sounds like?
  95. Help troubleshooting SE Pentode amp
  96. What meter for Bias?
  97. Tube tester block diagram
  98. got a custom 829b amp that i got laying around, need to know what driver to use
  99. Universal filament regulator
  100. ECC88 - 6DJ8 Cascode Plate Curves
  101. Gain of Phase Inverter
  102. CF/CCS, can it be made simpler?
  103. 2A3 Heater Hum Pot
  104. Need help - black out while the amp. was on
  105. simple question about cathodyne PI
  106. Where can I get a cover for the OPT and PS
  107. how to use oscilloscope
  108. I am collecting parts for my 200w mono amps "But"
  109. This seems wrong?
  110. StoetKit Junior Schematics
  111. Valve Amplifiers 3rd edition Errata
  112. Anybody ever compared the Eico HF81 to Harman Kardon A220 "The Lute"?
  113. 6v6 datasheet
  114. Leaving filaments on?
  115. output caps -- your observations, pleeze
  116. Low gain preamp.
  117. Recommended Tube/Valve references?
  118. Tube Socket Identification
  119. Some agreement on reasonable affordable and well performing design builds?
  120. Fletcher cooke OTL article
  121. I have 4 Pl504's. Are they best used as SE or PP ?
  122. More k12g amp musings
  123. How preserve loudness circuit with new volume pot?
  124. Where to find 212E tubes???
  125. Music Angel XD-SE EL34 Amp
  126. CV345 VS EL34
  127. Reducing Filment Hum in Tubes
  128. push pull power amp
  129. 6 ohm speakers....
  130. Gold Lion KT88 Issue
  131. Plate currents in P-P
  132. Testing amplifiers with computer software...
  133. Welborn Labs - Abysmal Service
  134. Repairing broken pins on valuable tube...
  135. Explain how feedback affects DF?
  136. Low emissions
  137. Tube Blue Glow question
  138. 6l6 data sheet question
  139. Physical Tube Diagnosis?
  140. how and why power amps clip
  141. Vacuum Tube OTL power amp!!
  142. Tube replacement options.....
  143. balanced RIAA amp
  144. power amp distortion
  145. Suggestions for 5k5 40W iron?
  146. Schematic Tube Analog Output Stage???
  147. 300B 'direct drive' using a 6U8..
  148. Magnavox 88-02 power trans ratings?
  149. Preamp with humming noise!
  150. How to choose line out transformer?
  151. Tools for Cutting Tube Socket Holes?
  152. Switchable SE.
  153. GZ33 in place of 5U4 can it be done?
  154. phase splitter issue
  155. Armstrong A10 MK2 EL34 mono block
  156. "Ug" The Transformer
  157. i think its time i start playing with caps
  158. problems with preamp on home brew
  159. LS180 Tube Socket?
  160. simple question - 5V heater power supply
  161. Lineamp
  162. FI AUDİO 421 A
  163. Pete Millett has another Red Board for sale
  164. Jolida JD9 Problem
  165. 6N11 = 6N1P ?
  166. K12-G tube amp problem
  167. Please vote for one of the schematics.
  168. Advantages of separate PS for input and output stages
  169. Another PCB tube amp design
  170. Help. Replacement OPT sqrueeechhh.
  171. New concept of a power amp
  172. Resurrecting weak tubes
  173. Best DHT heater?
  174. Help requested for EL84 SET amp
  175. What did I buy??
  176. Edcor and Custom Power Transformer Design
  177. What would you make with this power TX?
  178. Lundahl 1676
  179. DHT for 300B problem
  180. Newbie question about output transformer to speaker matching
  181. Red board add-on phono/RIAA pre-amp
  182. 2 Chassis amp
  183. Is It posible to bridge two quad II monoblocks?
  184. Power tube at work picture
  185. Tube SE power amp , which one??
  186. Hickok 539A issue
  187. Noise in one channel? Pioneer SX-400
  188. Hartung / Prestla OTL amps
  189. Lafayette Model 417
  190. Extreme plate load
  191. What do you think about this idea
  192. el84pse schem, need advice
  193. Video pentodes as outputs
  194. Chinese "Audio Research" KT88s
  195. New 6C33 Socket
  196. 2a3 PP output transformer
  197. Best SET design?
  198. Anybody ever tried EBC41 as 12AX7 substitute?
  199. The 7242
  200. 12bh7a
  201. Phase Splitter Help
  202. Oscilloscope Question
  203. sizing opt
  204. 6P3C-E Datasheet help
  205. on the toroids again
  206. OPT problem or Something else 6L6 PP
  207. Look what I found!
  208. Help, Diy tube amp
  209. Idea
  210. a few DIY tube amplifier setups
  211. 6L6 PP amp motorboating
  212. Mayer-inspired 4P1L
  213. 6L6 WGB 2X34W STEREO AMPL
  214. Tube Amp DIY or Retail
  215. Supplier for GU50 tubes
  216. 2E26's
  217. Encel Stereophonic M.F.B CSM 40 amplifier
  218. Mono 300B SE Amplifier
  219. Broken tubes for 3D Modelling
  220. Loud hum in one channel
  221. 6EM7 PP question
  222. 12AU7/IRF610 Hybrid Amplifier
  223. RIAA preamplifier
  224. Classic amp, Chinese or scratch-build for Quad ESL?
  225. CLASS A TUBE AMPLIFIER FOR TWEETER
  226. How to gap output transformers?
  227. Cathode bypasses - partial bypass and combination bias
  228. Phase splitter
  229. YS Audio balanced Preamp
  230. Low voltage 12AU7 (19J6) -- re "starving"
  231. phase splitter
  232. Music Angel Meng 6P1
  233. Is it possible to dampen a partially microphonic 12ax7?
  234. Pioneer SA-810 tube amp.
  235. 6C33 D.C.M.B. - Paging Ari Polisois
  236. Whose is this logo?
  237. What is grid resistance of 807/6l6 in pentode
  238. PAS Upgrade Boards by Epperson
  239. Bang and Olufsen 609k stereo se el84 fm tuner
  240. Finished EL34 tube amp... but oscilates weird..
  241. Scope Trace
  242. Drifty tubes
  243. Choosing plate voltage
  244. Determining Zout for SRPP
  245. PX25 amplifier - thoughts?
  246. Testing Ck5703 tubes
  247. When can screen voltage be higher than plate???
  248. 31AL10's
  249. Lafayette TE-50 Tube Tester
  250. Acoustic (not Audio) Alchemy - I need a wizzard

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