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  1. EL84
  2. Long tails and current sources
  3. How to reduce gain in mu-follower?
  4. Single Ended Amplifier 6P43P
  5. 6C33C spacing
  6. A very excitable Luminescence
  7. KT-88 Data sheet question.
  8. Good 12ax7
  9. Operating points theory...
  10. What should clipping look like? (AKA reading sine waves)
  11. Quicksilver Mono Amp Model 1300 - creating Auto Bias wanted
  12. 845 with kathode bias
  13. Looking for EI-75 80% perm ...
  14. Ambient temperature target
  15. Old radio
  16. JJ glowing twice as bright
  17. DPA150
  18. Discharging a capacitor - should I??
  19. German transformer builder
  20. 6P30B-V subminiature tube
  21. Improved Tube Headphones Amp
  22. Best method of reducing line voltage into vintage transformers?
  23. Harman-Kardon TA5000X, A500 or A50K OPT - Quality?
  24. hum measurement
  25. DIY 450VA+ multi-tapped tube power trafo
  26. DIY 450VA+ multi-tapped tube power trafo
  27. Duelund Alexander Copper Foil Capacitors
  28. Yaqin MS-20L tube recommendation
  29. Tube version of aleph-x. Is it possible?
  30. help - Looking for specs Trimax TA1439
  31. Mono 5W-17W Power Amp using EL84 push-pull
  32. Reference Books
  33. Tresco?
  34. BELL 3DT, Phono RIAA Odditty
  35. 6SL7/6V6 tubes in an RH84 SE amplifier?
  36. How to calculate max voltage swing in cathode follower?
  37. Silvaweld OTL Tube Reference 100 schematics
  38. Unison Research SMART 845
  39. 26/45 SE amp ?
  40. Sweep Tube SEP
  41. Help me find cirquit, I forgot where I last saw it?
  42. Plate resistor for FVP5a
  43. DHT w/ DC heater - How to rig cathode bias?
  44. schematics needed- Luxman MQ70
  45. CSS for 6c33?
  46. Svetlana (Winged C) 6L6GC vs. the Others...
  47. Power Supply Help- 807's, High Voltage
  48. Looking for info about a 1940s Amp
  49. More amplifiers in the Wireless World Archive
  50. why does my amp require a preamp?
  51. Why two GZ34 in this schematic?
  52. Floating Dc heaters, capacitor to ground
  53. anyone have experience with 1J17B tube
  54. Preventing arcing on standby switch?
  55. Help with buzzing mains transformer
  56. Balanced Amp Topology
  57. ECC33
  58. Distortion spectrum vs feedback
  59. Heaters question
  60. what's my fisher 400 off gassing?
  61. Executone schematic needed
  62. parafeed output amplifier
  63. CCCP SUBTUBE: my last project
  64. Aikido Line-Stage jumper question
  65. Tube Amplifier to power Gale GS401 speakers
  66. Bypass Cap on cathode?
  67. How to measure/calculate dB of negative feedback?
  68. Need your advices & experiences
  69. Parmeko gresham transformers specifications
  70. Valve cascodes for Phono input.
  71. ST-70 XLR Balanced Driver Boad
  72. I'm new here any places for like us newbies?
  73. Noob looking for some advice
  74. QQE04/5 Curves
  75. Help on Audio Research D79A adjustment
  76. lazarus preamp hums even with volume down and no components connected.
  77. Troubles when elevating a LT supply
  78. Turning up the heat: cathode bias
  79. Anyone build Dynaco Mk IIIs with Sullivan boards?
  80. Lowering gain on Frank's 6SN7 preamp
  81. Pro amp input modification
  82. Sanity of compactron for "integrated" headphone amp?
  83. HELP - SMART 845 or 300B SE
  84. DC Servo - Direct Coupling Applications?
  85. Edison 12 amplifier
  86. 6C33C tube socket for GM70 tube??
  87. Fisher X100C 2 sets speakers?
  88. 4P1L DHT Line Stage
  89. Trying to identify an old radio tube
  90. Yaqin CD3 upgrading caps help for novice
  91. push pull adjustable fixed bias
  92. Another SE amp design.
  93. Ray Butts Echosonic #27
  94. What coupling capacitor values are common
  95. Yamamoto A-09s
  96. 9001 variant of Acorn 954 Pentode
  97. Grounding the 4ohm tap
  98. Rectifier mechanical buzz
  99. Informed opinion(s) on phase inversion?
  100. Strange problem with Grundig CS200 tube receiver
  101. Puresound P10 RIAA
  102. Need help on DIY Toccata Phono Preamp
  103. Single 6EB8 tube kit?
  104. SE OPT as PS choke
  105. Best input DHT tube?
  106. Hm, which order to replace 2 out of 4 tubes?
  107. EL34 Musical Machine Output XFMR suggestions
  108. Driver stage to finals newbie questions - (I hope not dumb questions)
  109. Preamp with single 12ax7 Ecc83 for stereo?
  110. Ming-Da MC-300B845 schematic needed
  111. My RH84 Build - first amp after a 25 year break -:)
  112. Jolida 502a Snubber Mod
  113. Again
  114. KT120, PSE
  115. 6v6 bias with cathodyne
  116. How did the "magic eye" work on old valve radios ?
  117. High voltage switching
  118. EF184 as ccs / design questions / spice model
  119. ECC807
  120. Compactron 6C10 & 6Q11/6K11 tube data
  121. Reverse Engineering leads from Tube amp
  122. Did you all see this??
  123. WESTREX 60 WATT AMP
  124. Johari's audio system
  125. el95 single ended amp project needs help with preamp
  126. 3 ways active crossover
  127. 5691 tube tonal balance
  128. Dynaco Mark III chassis
  129. Stancor A-8053 Output Transformer - opinions wanted!
  130. Nice OPT's for headphone amp...
  131. Eimac 304TH anode question
  132. Is WE310A > 45 > 300B PP possible?
  133. Aikido 5687 PCB - Headphone and C3
  134. Tube RIAA(something easy)
  135. Testing power pentodes
  136. NTC Thermistor As Soft Start For Tubes
  137. NEW ARIA (MENG) MINI 6P1
  138. Basic schematic for Dodd Audio tube buffer?
  139. EL844
  140. Tube CAD?
  141. Cap Problem with philco 49-1401
  142. Music Angel
  143. Help 7189A Tubes!
  144. Bulb in cathode?
  145. Gain and volume pots - newbie question
  146. Resistor test TX7525 AMRG CMF55
  147. I think I made a mistake
  148. 12at7 and 12au7
  149. PSE KT88 using Mikael's basic schematic.....
  150. Mods Tube Amps/Pre-amp
  151. Help to find out what OPT are these
  152. LL1660 P PZ Lundahl interstage ringing problem GM70pp
  153. Adding Bal output to Akido
  154. Input impedance, the higher the better or not?
  155. Risk of DC coupled input with tube pre-amp ?
  156. UL Cascode phono
  157. DC Imbalance with the LTP
  158. More Wireless World articles archived
  159. Yaqin VK-2100 Static from one channel
  160. Direct Coupled, Self Biasing, CCS Loaded, 300B Amp
  161. Testing a 300A on a B&K
  162. Diodes to tube
  163. PL84/EL86 push pull
  164. circuit diagram
  165. Ultralinear operation
  166. 60hz hum in component system
  167. Crackling Amp
  168. Explanation wanted
  169. Dynaco FM1 stereo updating ?
  170. tube amp diy off. Is this a good deal?
  171. SE driver
  172. DN2540 + LM317 cascode CCS?
  173. Recapping old tube amp
  174. How a SRPP stage sounds like?
  175. Help troubleshooting SE Pentode amp
  176. What meter for Bias?
  177. got a custom 829b amp that i got laying around, need to know what driver to use
  178. Universal filament regulator
  179. ECC88 - 6DJ8 Cascode Plate Curves
  180. Gain of Phase Inverter
  181. CF/CCS, can it be made simpler?
  182. 2A3 Heater Hum Pot
  183. Need help - black out while the amp. was on
  184. simple question about cathodyne PI
  185. Where can I get a cover for the OPT and PS
  186. I am collecting parts for my 200w mono amps "But"
  187. This seems wrong?
  188. StoetKit Junior Schematics
  189. Valve Amplifiers 3rd edition Errata
  190. Anybody ever compared the Eico HF81 to Harman Kardon A220 "The Lute"?
  191. 6v6 datasheet
  192. Leaving filaments on?
  193. output caps -- your observations, pleeze
  194. Low gain preamp.
  195. Recommended Tube/Valve references?
  196. Tube Socket Identification
  197. Some agreement on reasonable affordable and well performing design builds?
  198. Fletcher cooke OTL article
  199. I have 4 Pl504's. Are they best used as SE or PP ?
  200. More k12g amp musings
  201. How preserve loudness circuit with new volume pot?
  202. Where to find 212E tubes???
  203. Music Angel XD-SE EL34 Amp
  204. CV345 VS EL34
  205. Reducing Filment Hum in Tubes
  206. push pull power amp
  207. 6 ohm speakers....
  208. Gold Lion KT88 Issue
  209. Plate currents in P-P
  210. Testing amplifiers with computer software...
  211. Welborn Labs - Abysmal Service
  212. Repairing broken pins on valuable tube...
  213. Explain how feedback affects DF?
  214. Low emissions
  215. Tube Blue Glow question
  216. 6l6 data sheet question
  217. Physical Tube Diagnosis?
  218. how and why power amps clip
  219. Vacuum Tube OTL power amp!!
  220. Tube replacement options.....
  221. balanced RIAA amp
  222. power amp distortion
  223. Suggestions for 5k5 40W iron?
  224. Schematic Tube Analog Output Stage???
  225. 300B 'direct drive' using a 6U8..
  226. Magnavox 88-02 power trans ratings?
  227. Preamp with humming noise!
  228. How to choose line out transformer?
  229. Tools for Cutting Tube Socket Holes?
  230. Switchable SE.
  231. GZ33 in place of 5U4 can it be done?
  232. phase splitter issue
  233. Armstrong A10 MK2 EL34 mono block
  234. "Ug" The Transformer
  235. problems with preamp on home brew
  236. LS180 Tube Socket?
  237. simple question - 5V heater power supply
  238. Lineamp
  239. FI AUDİO 421 A
  240. Pete Millett has another Red Board for sale
  241. Jolida JD9 Problem
  242. 6N11 = 6N1P ?
  243. K12-G tube amp problem
  244. Please vote for one of the schematics.
  245. Advantages of separate PS for input and output stages
  246. Another PCB tube amp design
  247. Help. Replacement OPT sqrueeechhh.
  248. New concept of a power amp
  249. Resurrecting weak tubes
  250. Best DHT heater?

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