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  1. Quicksilver Mono Amp Model 1300 - creating Auto Bias wanted
  2. 845 with kathode bias
  3. Looking for EI-75 80% perm ...
  4. Ambient temperature target
  5. Old radio
  6. JJ glowing twice as bright
  7. DPA150
  8. Discharging a capacitor - should I??
  9. German transformer builder
  10. 6P30B-V subminiature tube
  11. Improved Tube Headphones Amp
  12. Best method of reducing line voltage into vintage transformers?
  13. Harman-Kardon TA5000X, A500 or A50K OPT - Quality?
  14. hum measurement
  15. DIY 450VA+ multi-tapped tube power trafo
  16. DIY 450VA+ multi-tapped tube power trafo
  17. Duelund Alexander Copper Foil Capacitors
  18. Yaqin MS-20L tube recommendation
  19. Tube version of aleph-x. Is it possible?
  20. help - Looking for specs Trimax TA1439
  21. Mono 5W-17W Power Amp using EL84 push-pull
  22. Reference Books
  23. Tresco?
  24. BELL 3DT, Phono RIAA Odditty
  25. 6SL7/6V6 tubes in an RH84 SE amplifier?
  26. How to calculate max voltage swing in cathode follower?
  27. Silvaweld OTL Tube Reference 100 schematics
  28. Unison Research SMART 845
  29. 26/45 SE amp ?
  30. Sweep Tube SEP
  31. Help me find cirquit, I forgot where I last saw it?
  32. Plate resistor for FVP5a
  33. DHT w/ DC heater - How to rig cathode bias?
  34. schematics needed- Luxman MQ70
  35. CSS for 6c33?
  36. Svetlana (Winged C) 6L6GC vs. the Others...
  37. Power Supply Help- 807's, High Voltage
  38. Looking for info about a 1940s Amp
  39. More amplifiers in the Wireless World Archive
  40. why does my amp require a preamp?
  41. Why two GZ34 in this schematic?
  42. Floating Dc heaters, capacitor to ground
  43. anyone have experience with 1J17B tube
  44. Preventing arcing on standby switch?
  45. Help with buzzing mains transformer
  46. Balanced Amp Topology
  47. ECC33
  48. Distortion spectrum vs feedback
  49. Heaters question
  50. what's my fisher 400 off gassing?
  51. Executone schematic needed
  52. parafeed output amplifier
  53. CCCP SUBTUBE: my last project
  54. Aikido Line-Stage jumper question
  55. Tube Amplifier to power Gale GS401 speakers
  56. Bypass Cap on cathode?
  57. How to measure/calculate dB of negative feedback?
  58. Need your advices & experiences
  59. Parmeko gresham transformers specifications
  60. Valve cascodes for Phono input.
  61. ST-70 XLR Balanced Driver Boad
  62. I'm new here any places for like us newbies?
  63. Noob looking for some advice
  64. QQE04/5 Curves
  65. Help on Audio Research D79A adjustment
  66. lazarus preamp hums even with volume down and no components connected.
  67. Troubles when elevating a LT supply
  68. Turning up the heat: cathode bias
  69. Anyone build Dynaco Mk IIIs with Sullivan boards?
  70. Lowering gain on Frank's 6SN7 preamp
  71. Pro amp input modification
  72. Sanity of compactron for "integrated" headphone amp?
  73. HELP - SMART 845 or 300B SE
  74. DC Servo - Direct Coupling Applications?
  75. Edison 12 amplifier
  76. 6C33C tube socket for GM70 tube??
  77. Fisher X100C 2 sets speakers?
  78. 4P1L DHT Line Stage
  79. Trying to identify an old radio tube
  80. Yaqin CD3 upgrading caps help for novice
  81. push pull adjustable fixed bias
  82. Another SE amp design.
  83. Ray Butts Echosonic #27
  84. What coupling capacitor values are common
  85. Yamamoto A-09s
  86. 9001 variant of Acorn 954 Pentode
  87. Grounding the 4ohm tap
  88. Rectifier mechanical buzz
  89. Informed opinion(s) on phase inversion?
  90. Strange problem with Grundig CS200 tube receiver
  91. Puresound P10 RIAA
  92. Need help on DIY Toccata Phono Preamp
  93. Single 6EB8 tube kit?
  94. SE OPT as PS choke
  95. Best input DHT tube?
  96. Hm, which order to replace 2 out of 4 tubes?
  97. EL34 Musical Machine Output XFMR suggestions
  98. Driver stage to finals newbie questions - (I hope not dumb questions)
  99. Preamp with single 12ax7 Ecc83 for stereo?
  100. Ming-Da MC-300B845 schematic needed
  101. My RH84 Build - first amp after a 25 year break -:)
  102. Jolida 502a Snubber Mod
  103. Again
  104. KT120, PSE
  105. 6v6 bias with cathodyne
  106. How did the "magic eye" work on old valve radios ?
  107. High voltage switching
  108. EF184 as ccs / design questions / spice model
  109. ECC807
  110. Compactron 6C10 & 6Q11/6K11 tube data
  111. Reverse Engineering leads from Tube amp
  112. Did you all see this??
  113. WESTREX 60 WATT AMP
  114. Johari's audio system
  115. el95 single ended amp project needs help with preamp
  116. 3 ways active crossover
  117. 5691 tube tonal balance
  118. Dynaco Mark III chassis
  119. Stancor A-8053 Output Transformer - opinions wanted!
  120. Nice OPT's for headphone amp...
  121. Eimac 304TH anode question
  122. Is WE310A > 45 > 300B PP possible?
  123. Aikido 5687 PCB - Headphone and C3
  124. Tube RIAA(something easy)
  125. Testing power pentodes
  126. NTC Thermistor As Soft Start For Tubes
  127. NEW ARIA (MENG) MINI 6P1
  128. Basic schematic for Dodd Audio tube buffer?
  129. EL844
  130. Tube CAD?
  131. Cap Problem with philco 49-1401
  132. Music Angel
  133. Help 7189A Tubes!
  134. Bulb in cathode?
  135. Gain and volume pots - newbie question
  136. Resistor test TX7525 AMRG CMF55
  137. I think I made a mistake
  138. 12at7 and 12au7
  139. PSE KT88 using Mikael's basic schematic.....
  140. Mods Tube Amps/Pre-amp
  141. Help to find out what OPT are these
  142. LL1660 P PZ Lundahl interstage ringing problem GM70pp
  143. Adding Bal output to Akido
  144. Input impedance, the higher the better or not?
  145. Risk of DC coupled input with tube pre-amp ?
  146. UL Cascode phono
  147. DC Imbalance with the LTP
  148. More Wireless World articles archived
  149. Yaqin VK-2100 Static from one channel
  150. Direct Coupled, Self Biasing, CCS Loaded, 300B Amp
  151. Testing a 300A on a B&K
  152. Diodes to tube
  153. PL84/EL86 push pull
  154. circuit diagram
  155. Ultralinear operation
  156. 60hz hum in component system
  157. Crackling Amp
  158. Explanation wanted
  159. Dynaco FM1 stereo updating ?
  160. tube amp diy off. Is this a good deal?
  161. SE driver
  162. DN2540 + LM317 cascode CCS?
  163. Recapping old tube amp
  164. How a SRPP stage sounds like?
  165. Help troubleshooting SE Pentode amp
  166. What meter for Bias?
  167. got a custom 829b amp that i got laying around, need to know what driver to use
  168. Universal filament regulator
  169. ECC88 - 6DJ8 Cascode Plate Curves
  170. Gain of Phase Inverter
  171. CF/CCS, can it be made simpler?
  172. 2A3 Heater Hum Pot
  173. Need help - black out while the amp. was on
  174. simple question about cathodyne PI
  175. Where can I get a cover for the OPT and PS
  176. I am collecting parts for my 200w mono amps "But"
  177. This seems wrong?
  178. StoetKit Junior Schematics
  179. Valve Amplifiers 3rd edition Errata
  180. Anybody ever compared the Eico HF81 to Harman Kardon A220 "The Lute"?
  181. 6v6 datasheet
  182. Leaving filaments on?
  183. output caps -- your observations, pleeze
  184. Low gain preamp.
  185. Recommended Tube/Valve references?
  186. Tube Socket Identification
  187. Some agreement on reasonable affordable and well performing design builds?
  188. Fletcher cooke OTL article
  189. I have 4 Pl504's. Are they best used as SE or PP ?
  190. More k12g amp musings
  191. How preserve loudness circuit with new volume pot?
  192. Where to find 212E tubes???
  193. Music Angel XD-SE EL34 Amp
  194. CV345 VS EL34
  195. Reducing Filment Hum in Tubes
  196. push pull power amp
  197. 6 ohm speakers....
  198. Gold Lion KT88 Issue
  199. Plate currents in P-P
  200. Testing amplifiers with computer software...
  201. Welborn Labs - Abysmal Service
  202. Repairing broken pins on valuable tube...
  203. Explain how feedback affects DF?
  204. Low emissions
  205. Tube Blue Glow question
  206. 6l6 data sheet question
  207. Physical Tube Diagnosis?
  208. how and why power amps clip
  209. Vacuum Tube OTL power amp!!
  210. Tube replacement options.....
  211. balanced RIAA amp
  212. power amp distortion
  213. Suggestions for 5k5 40W iron?
  214. Schematic Tube Analog Output Stage???
  215. 300B 'direct drive' using a 6U8..
  216. Magnavox 88-02 power trans ratings?
  217. Preamp with humming noise!
  218. How to choose line out transformer?
  219. Tools for Cutting Tube Socket Holes?
  220. Switchable SE.
  221. GZ33 in place of 5U4 can it be done?
  222. phase splitter issue
  223. Armstrong A10 MK2 EL34 mono block
  224. "Ug" The Transformer
  225. problems with preamp on home brew
  226. LS180 Tube Socket?
  227. simple question - 5V heater power supply
  228. Lineamp
  229. FI AUDİO 421 A
  230. Pete Millett has another Red Board for sale
  231. Jolida JD9 Problem
  232. 6N11 = 6N1P ?
  233. K12-G tube amp problem
  234. Please vote for one of the schematics.
  235. Advantages of separate PS for input and output stages
  236. Another PCB tube amp design
  237. Help. Replacement OPT sqrueeechhh.
  238. New concept of a power amp
  239. Resurrecting weak tubes
  240. Best DHT heater?
  241. Help requested for EL84 SET amp
  242. What did I buy??
  243. Edcor and Custom Power Transformer Design
  244. What would you make with this power TX?
  245. Lundahl 1676
  246. DHT for 300B problem
  247. Newbie question about output transformer to speaker matching
  248. Red board add-on phono/RIAA pre-amp
  249. 2 Chassis amp
  250. Is It posible to bridge two quad II monoblocks?

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