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  1. Preventing arcing on standby switch?
  2. Help with buzzing mains transformer
  3. Balanced Amp Topology
  4. ECC33
  5. Distortion spectrum vs feedback
  6. Heaters question
  7. what's my fisher 400 off gassing?
  8. Executone schematic needed
  9. parafeed output amplifier
  10. CCCP SUBTUBE: my last project
  11. Aikido Line-Stage jumper question
  12. Tube Amplifier to power Gale GS401 speakers
  13. Bypass Cap on cathode?
  14. How to measure/calculate dB of negative feedback?
  15. Need your advices & experiences
  16. Parmeko gresham transformers specifications
  17. Valve cascodes for Phono input.
  18. ST-70 XLR Balanced Driver Boad
  19. I'm new here any places for like us newbies?
  20. Noob looking for some advice
  21. QQE04/5 Curves
  22. Help on Audio Research D79A adjustment
  23. lazarus preamp hums even with volume down and no components connected.
  24. Troubles when elevating a LT supply
  25. Turning up the heat: cathode bias
  26. Anyone build Dynaco Mk IIIs with Sullivan boards?
  27. Lowering gain on Frank's 6SN7 preamp
  28. Pro amp input modification
  29. Sanity of compactron for "integrated" headphone amp?
  30. HELP - SMART 845 or 300B SE
  31. DC Servo - Direct Coupling Applications?
  32. Edison 12 amplifier
  33. 6C33C tube socket for GM70 tube??
  34. Fisher X100C 2 sets speakers?
  35. 4P1L DHT Line Stage
  36. Trying to identify an old radio tube
  37. Yaqin CD3 upgrading caps help for novice
  38. push pull adjustable fixed bias
  39. Another SE amp design.
  40. Ray Butts Echosonic #27
  41. What coupling capacitor values are common
  42. Yamamoto A-09s
  43. 9001 variant of Acorn 954 Pentode
  44. Grounding the 4ohm tap
  45. Rectifier mechanical buzz
  46. Informed opinion(s) on phase inversion?
  47. Strange problem with Grundig CS200 tube receiver
  48. Puresound P10 RIAA
  49. Need help on DIY Toccata Phono Preamp
  50. Single 6EB8 tube kit?
  51. SE OPT as PS choke
  52. Best input DHT tube?
  53. Hm, which order to replace 2 out of 4 tubes?
  54. EL34 Musical Machine Output XFMR suggestions
  55. Driver stage to finals newbie questions - (I hope not dumb questions)
  56. Preamp with single 12ax7 Ecc83 for stereo?
  57. Ming-Da MC-300B845 schematic needed
  58. My RH84 Build - first amp after a 25 year break -:)
  59. Jolida 502a Snubber Mod
  60. Again
  61. KT120, PSE
  62. 6v6 bias with cathodyne
  63. How did the "magic eye" work on old valve radios ?
  64. High voltage switching
  65. EF184 as ccs / design questions / spice model
  66. ECC807
  67. Compactron 6C10 & 6Q11/6K11 tube data
  68. Reverse Engineering leads from Tube amp
  69. Did you all see this??
  70. WESTREX 60 WATT AMP
  71. Johari's audio system
  72. el95 single ended amp project needs help with preamp
  73. 3 ways active crossover
  74. 5691 tube tonal balance
  75. Dynaco Mark III chassis
  76. Stancor A-8053 Output Transformer - opinions wanted!
  77. Nice OPT's for headphone amp...
  78. Eimac 304TH anode question
  79. Is WE310A > 45 > 300B PP possible?
  80. Aikido 5687 PCB - Headphone and C3
  81. Tube RIAA(something easy)
  82. Testing power pentodes
  83. NTC THERMISTOR as SOFT START for TUBES
  84. NEW ARIA (MENG) MINI 6P1
  85. Basic schematic for Dodd Audio tube buffer?
  86. EL844
  87. Tube CAD?
  88. Cap Problem with philco 49-1401
  89. Music Angel
  90. Help 7189A Tubes!
  91. Bulb in cathode?
  92. Gain and volume pots - newbie question
  93. Resistor test TX7525 AMRG CMF55
  94. I think I made a mistake
  95. 12at7 and 12au7
  96. PSE KT88 using Mikael's basic schematic.....
  97. Mods Tube Amps/Pre-amp
  98. Help to find out what OPT are these
  99. LL1660 P PZ Lundahl interstage ringing problem GM70pp
  100. Adding Bal output to Akido
  101. Input impedance, the higher the better or not?
  102. Risk of DC coupled input with tube pre-amp ?
  103. UL Cascode phono
  104. DC Imbalance with the LTP
  105. More Wireless World articles archived
  106. Yaqin VK-2100 Static from one channel
  107. Direct Coupled, Self Biasing, CCS Loaded, 300B Amp
  108. Testing a 300A on a B&K
  109. Diodes to tube
  110. PL84/EL86 push pull
  111. circuit diagram
  112. Ultralinear operation
  113. 60hz hum in component system
  114. Crackling Amp
  115. Explanation wanted
  116. Dynaco FM1 stereo updating ?
  117. tube amp diy off. Is this a good deal?
  118. SE driver
  119. DN2540 + LM317 cascode CCS?
  120. Recapping old tube amp
  121. How a SRPP stage sounds like?
  122. Help troubleshooting SE Pentode amp
  123. What meter for Bias?
  124. Tube tester block diagram
  125. got a custom 829b amp that i got laying around, need to know what driver to use
  126. Universal filament regulator
  127. ECC88 - 6DJ8 Cascode Plate Curves
  128. Gain of Phase Inverter
  129. CF/CCS, can it be made simpler?
  130. 2A3 Heater Hum Pot
  131. Need help - black out while the amp. was on
  132. simple question about cathodyne PI
  133. Where can I get a cover for the OPT and PS
  134. how to use oscilloscope
  135. I am collecting parts for my 200w mono amps "But"
  136. This seems wrong?
  137. StoetKit Junior Schematics
  138. Valve Amplifiers 3rd edition Errata
  139. Anybody ever compared the Eico HF81 to Harman Kardon A220 "The Lute"?
  140. 6v6 datasheet
  141. Leaving filaments on?
  142. output caps -- your observations, pleeze
  143. Low gain preamp.
  144. Recommended Tube/Valve references?
  145. Tube Socket Identification
  146. Some agreement on reasonable affordable and well performing design builds?
  147. Fletcher cooke OTL article
  148. I have 4 Pl504's. Are they best used as SE or PP ?
  149. More k12g amp musings
  150. How preserve loudness circuit with new volume pot?
  151. Where to find 212E tubes???
  152. Music Angel XD-SE EL34 Amp
  153. CV345 VS EL34
  154. Reducing Filment Hum in Tubes
  155. push pull power amp
  156. 6 ohm speakers....
  157. Gold Lion KT88 Issue
  158. Plate currents in P-P
  159. Testing amplifiers with computer software...
  160. Welborn Labs - Abysmal Service
  161. Repairing broken pins on valuable tube...
  162. Explain how feedback affects DF?
  163. Low emissions
  164. Tube Blue Glow question
  165. 6l6 data sheet question
  166. Physical Tube Diagnosis?
  167. how and why power amps clip
  168. Vacuum Tube OTL power amp!!
  169. Tube replacement options.....
  170. balanced RIAA amp
  171. power amp distortion
  172. Suggestions for 5k5 40W iron?
  173. Schematic Tube Analog Output Stage???
  174. 300B 'direct drive' using a 6U8..
  175. Magnavox 88-02 power trans ratings?
  176. Preamp with humming noise!
  177. How to choose line out transformer?
  178. Tools for Cutting Tube Socket Holes?
  179. Switchable SE.
  180. GZ33 in place of 5U4 can it be done?
  181. phase splitter issue
  182. Armstrong A10 MK2 EL34 mono block
  183. "Ug" The Transformer
  184. problems with preamp on home brew
  185. LS180 Tube Socket?
  186. simple question - 5V heater power supply
  187. Lineamp
  188. FI AUDİO 421 A
  189. Pete Millett has another Red Board for sale
  190. Jolida JD9 Problem
  191. 6N11 = 6N1P ?
  192. K12-G tube amp problem
  193. Please vote for one of the schematics.
  194. Advantages of separate PS for input and output stages
  195. Another PCB tube amp design
  196. Help. Replacement OPT sqrueeechhh.
  197. New concept of a power amp
  198. Resurrecting weak tubes
  199. Best DHT heater?
  200. Help requested for EL84 SET amp
  201. What did I buy??
  202. Edcor and Custom Power Transformer Design
  203. What would you make with this power TX?
  204. Lundahl 1676
  205. DHT for 300B problem
  206. Newbie question about output transformer to speaker matching
  207. Red board add-on phono/RIAA pre-amp
  208. 2 Chassis amp
  209. Is It posible to bridge two quad II monoblocks?
  210. Power tube at work picture
  211. Tube SE power amp , which one??
  212. Hickok 539A issue
  213. Noise in one channel? Pioneer SX-400
  214. Hartung / Prestla OTL amps
  215. Lafayette Model 417
  216. Extreme plate load
  217. What do you think about this idea
  218. el84pse schem, need advice
  219. Video pentodes as outputs
  220. Chinese "Audio Research" KT88s
  221. New 6C33 Socket
  222. 2a3 PP output transformer
  223. Best SET design?
  224. Anybody ever tried EBC41 as 12AX7 substitute?
  225. The 7242
  226. 12bh7a
  227. Phase Splitter Help
  228. Oscilloscope Question
  229. sizing opt
  230. 6P3C-E Datasheet help
  231. on the toroids again
  232. OPT problem or Something else 6L6 PP
  233. Look what I found!
  234. Help, Diy tube amp
  235. Idea
  236. a few DIY tube amplifier setups
  237. 6L6 PP amp motorboating
  238. Mayer-inspired 4P1L
  239. 6L6 WGB 2X34W STEREO AMPL
  240. Tube Amp DIY or Retail
  241. Supplier for GU50 tubes
  242. 2E26's
  243. Encel Stereophonic M.F.B CSM 40 amplifier
  244. Mono 300B SE Amplifier
  245. Broken tubes for 3D Modelling
  246. Loud hum in one channel
  247. 6EM7 PP question
  248. 12AU7/IRF610 Hybrid Amplifier
  249. RIAA preamplifier
  250. Classic amp, Chinese or scratch-build for Quad ESL?

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