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  1. pick tubes for tubecad unbalancer
  2. OPT for EL34
  3. 12v dc tube amp/pre high SQ
  4. Better than 12au7?
  5. Amps and 4-ohm loads
  6. What is the "best" tube amp / speaker / source you have ever used?
  7. 814 as Triode / Max. Ug2 voltage
  8. musical fidelity x10d clone
  9. Acrosound 7591A amp
  10. suggestions for simple amp wanted
  11. Wish you could nail down your copper wool holder?
  12. HELP- Pricing Genuine Genalex KT77's
  13. K120 on 6550/KT88/KT90 anyone tried???
  14. do tubes ever leak b+ into heaters?
  15. How can I use these high-current, low-inductance chokes?
  16. 6005w Q+introduction
  17. Sonic Frontiers Line 3 Increate the Output Voltage
  18. Dynaco ST-70 chassis
  19. Opinion on the scheme with the 12AX7!
  20. Fully Parametric Tube EQ (with gyrators)
  21. anyone knows of 6 channel tube amplier ?
  22. 6N6P SE idea
  23. EL84
  24. Long tails and current sources
  25. How to reduce gain in mu-follower?
  26. Single Ended Amplifier 6P43P
  27. 6C33C spacing
  28. A very excitable Luminescence
  29. KT-88 Data sheet question.
  30. Good 12ax7
  31. Operating points theory...
  32. 1-stage (killer, literally) amp made of junk
  33. What should clipping look like? (AKA reading sine waves)
  34. Quicksilver Mono Amp Model 1300 - creating Auto Bias wanted
  35. 845 with kathode bias
  36. Looking for EI-75 80% perm ...
  37. Ambient temperature target
  38. Old radio
  39. JJ glowing twice as bright
  40. DPA150
  41. Discharging a capacitor - should I??
  42. German transformer builder
  43. 6P30B-V subminiature tube
  44. Improved Tube Headphones Amp
  45. Best method of reducing line voltage into vintage transformers?
  46. Harman-Kardon TA5000X, A500 or A50K OPT - Quality?
  47. hum measurement
  48. DIY 450VA+ multi-tapped tube power trafo
  49. DIY 450VA+ multi-tapped tube power trafo
  50. Duelund Alexander Copper Foil Capacitors
  51. Yaqin MS-20L tube recommendation
  52. Tube version of aleph-x. Is it possible?
  53. help - Looking for specs Trimax TA1439
  54. Mono 5W-17W Power Amp using EL84 push-pull
  55. Reference Books
  56. Tresco?
  57. BELL 3DT, Phono RIAA Odditty
  58. 6SL7/6V6 tubes in an RH84 SE amplifier?
  59. How to calculate max voltage swing in cathode follower?
  60. Silvaweld OTL Tube Reference 100 schematics
  61. Unison Research SMART 845
  62. 26/45 SE amp ?
  63. Sweep Tube SEP
  64. Help me find cirquit, I forgot where I last saw it?
  65. Plate resistor for FVP5a
  66. DHT w/ DC heater - How to rig cathode bias?
  67. schematics needed- Luxman MQ70
  68. CSS for 6c33?
  69. Svetlana (Winged C) 6L6GC vs. the Others...
  70. Power Supply Help- 807's, High Voltage
  71. Looking for info about a 1940s Amp
  72. More amplifiers in the Wireless World Archive
  73. why does my amp require a preamp?
  74. Why two GZ34 in this schematic?
  75. Floating Dc heaters, capacitor to ground
  76. anyone have experience with 1J17B tube
  77. Preventing arcing on standby switch?
  78. Help with buzzing mains transformer
  79. Balanced Amp Topology
  80. ECC33
  81. Distortion spectrum vs feedback
  82. Heaters question
  83. what's my fisher 400 off gassing?
  84. Executone schematic needed
  85. parafeed output amplifier
  86. CCCP SUBTUBE: my last project
  87. Aikido Line-Stage jumper question
  88. Tube Amplifier to power Gale GS401 speakers
  89. Bypass Cap on cathode?
  90. How to measure/calculate dB of negative feedback?
  91. Need your advices & experiences
  92. Parmeko gresham transformers specifications
  93. Valve cascodes for Phono input.
  94. ST-70 XLR Balanced Driver Boad
  95. I'm new here any places for like us newbies?
  96. Noob looking for some advice
  97. QQE04/5 Curves
  98. Help on Audio Research D79A adjustment
  99. lazarus preamp hums even with volume down and no components connected.
  100. Troubles when elevating a LT supply
  101. Turning up the heat: cathode bias
  102. Anyone build Dynaco Mk IIIs with Sullivan boards?
  103. Lowering gain on Frank's 6SN7 preamp
  104. Pro amp input modification
  105. Sanity of compactron for "integrated" headphone amp?
  106. HELP - SMART 845 or 300B SE
  107. DC Servo - Direct Coupling Applications?
  108. Edison 12 amplifier
  109. 6C33C tube socket for GM70 tube??
  110. Fisher X100C 2 sets speakers?
  111. 4P1L DHT Line Stage
  112. Trying to identify an old radio tube
  113. Yaqin CD3 upgrading caps help for novice
  114. push pull adjustable fixed bias
  115. Another SE amp design.
  116. Ray Butts Echosonic #27
  117. What coupling capacitor values are common
  118. Yamamoto A-09s
  119. 9001 variant of Acorn 954 Pentode
  120. Grounding the 4ohm tap
  121. Rectifier mechanical buzz
  122. Informed opinion(s) on phase inversion?
  123. Strange problem with Grundig CS200 tube receiver
  124. Puresound P10 RIAA
  125. Need help on DIY Toccata Phono Preamp
  126. Single 6EB8 tube kit?
  127. SE OPT as PS choke
  128. Best input DHT tube?
  129. Hm, which order to replace 2 out of 4 tubes?
  130. EL34 Musical Machine Output XFMR suggestions
  131. Driver stage to finals newbie questions - (I hope not dumb questions)
  132. Preamp with single 12ax7 Ecc83 for stereo?
  133. Ming-Da MC-300B845 schematic needed
  134. My RH84 Build - first amp after a 25 year break -:)
  135. Jolida 502a Snubber Mod
  136. Again
  137. KT120, PSE
  138. 6v6 bias with cathodyne
  139. How did the "magic eye" work on old valve radios ?
  140. High voltage switching
  141. EF184 as ccs / design questions / spice model
  142. ECC807
  143. Compactron 6C10 & 6Q11/6K11 tube data
  144. Reverse Engineering leads from Tube amp
  145. Did you all see this??
  146. WESTREX 60 WATT AMP
  147. Johari's audio system
  148. el95 single ended amp project needs help with preamp
  149. 3 ways active crossover
  150. 5691 tube tonal balance
  151. Dynaco Mark III chassis
  152. Stancor A-8053 Output Transformer - opinions wanted!
  153. Nice OPT's for headphone amp...
  154. Eimac 304TH anode question
  155. Is WE310A > 45 > 300B PP possible?
  156. Aikido 5687 PCB - Headphone and C3
  157. Tube RIAA(something easy)
  158. Testing power pentodes
  159. NTC Thermistor As Soft Start For Tubes
  160. NEW ARIA (MENG) MINI 6P1
  161. Basic schematic for Dodd Audio tube buffer?
  162. EL844
  163. Tube CAD?
  164. Cap Problem with philco 49-1401
  165. Music Angel
  166. Help 7189A Tubes!
  167. Bulb in cathode?
  168. Gain and volume pots - newbie question
  169. Resistor test TX7525 AMRG CMF55
  170. I think I made a mistake
  171. 12at7 and 12au7
  172. PSE KT88 using Mikael's basic schematic.....
  173. Mods Tube Amps/Pre-amp
  174. Help to find out what OPT are these
  175. LL1660 P PZ Lundahl interstage ringing problem GM70pp
  176. Adding Bal output to Akido
  177. Input impedance, the higher the better or not?
  178. Risk of DC coupled input with tube pre-amp ?
  179. UL Cascode phono
  180. DC Imbalance with the LTP
  181. More Wireless World articles archived
  182. Yaqin VK-2100 Static from one channel
  183. Direct Coupled, Self Biasing, CCS Loaded, 300B Amp
  184. Testing a 300A on a B&K
  185. Diodes to tube
  186. PL84/EL86 push pull
  187. circuit diagram
  188. Ultralinear operation
  189. 60hz hum in component system
  190. Crackling Amp
  191. Explanation wanted
  192. Dynaco FM1 stereo updating ?
  193. tube amp diy off. Is this a good deal?
  194. SE driver
  195. DN2540 + LM317 cascode CCS?
  196. Recapping old tube amp
  197. How a SRPP stage sounds like?
  198. Help troubleshooting SE Pentode amp
  199. What meter for Bias?
  200. got a custom 829b amp that i got laying around, need to know what driver to use
  201. Universal filament regulator
  202. ECC88 - 6DJ8 Cascode Plate Curves
  203. Gain of Phase Inverter
  204. CF/CCS, can it be made simpler?
  205. 2A3 Heater Hum Pot
  206. Need help - black out while the amp. was on
  207. simple question about cathodyne PI
  208. Where can I get a cover for the OPT and PS
  209. I am collecting parts for my 200w mono amps "But"
  210. This seems wrong?
  211. StoetKit Junior Schematics
  212. Valve Amplifiers 3rd edition Errata
  213. Anybody ever compared the Eico HF81 to Harman Kardon A220 "The Lute"?
  214. 6v6 datasheet
  215. Leaving filaments on?
  216. output caps -- your observations, pleeze
  217. Low gain preamp.
  218. Recommended Tube/Valve references?
  219. Tube Socket Identification
  220. Some agreement on reasonable affordable and well performing design builds?
  221. Fletcher cooke OTL article
  222. I have 4 Pl504's. Are they best used as SE or PP ?
  223. More k12g amp musings
  224. How preserve loudness circuit with new volume pot?
  225. Where to find 212E tubes???
  226. Music Angel XD-SE EL34 Amp
  227. CV345 VS EL34
  228. Reducing Filment Hum in Tubes
  229. push pull power amp
  230. 6 ohm speakers....
  231. Gold Lion KT88 Issue
  232. Plate currents in P-P
  233. Testing amplifiers with computer software...
  234. Welborn Labs - Abysmal Service
  235. Repairing broken pins on valuable tube...
  236. Explain how feedback affects DF?
  237. Low emissions
  238. Tube Blue Glow question
  239. 6l6 data sheet question
  240. Physical Tube Diagnosis?
  241. how and why power amps clip
  242. Vacuum Tube OTL power amp!!
  243. Tube replacement options.....
  244. balanced RIAA amp
  245. power amp distortion
  246. Suggestions for 5k5 40W iron?
  247. Schematic Tube Analog Output Stage???
  248. 300B 'direct drive' using a 6U8..
  249. Magnavox 88-02 power trans ratings?
  250. Preamp with humming noise!

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