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  1. Lowering gain on Frank's 6SN7 preamp
  2. Pro amp input modification
  3. Sanity of compactron for "integrated" headphone amp?
  4. vdc drop
  5. HELP - SMART 845 or 300B SE
  6. DC Servo - Direct Coupling Applications?
  7. Edison 12 amplifier
  8. Mounting terminal strips to blank copper board
  9. 6C33C tube socket for GM70 tube??
  10. Fisher X100C 2 sets speakers?
  11. 4P1L DHT Line Stage
  12. Trying to identify an old radio tube
  13. Yaqin CD3 upgrading caps help for novice
  14. push pull adjustable fixed bias
  15. Another SE amp design.
  16. Chassis to experiment with....
  17. Ray Butts Echosonic #27
  18. Ampeg Reverberocket II Hum
  19. What coupling capacitor values are common
  20. Yamamoto A-09s
  21. 9001 variant of Acorn 954 Pentode
  22. Khron-Hite UHR220 tube power source
  23. Grounding the 4ohm tap
  24. Rectifier mechanical buzz
  25. Informed opinion(s) on phase inversion?
  26. Computer grade electrolytics
  27. Strange problem with Grundig CS200 tube receiver
  28. Puresound P10 RIAA
  29. Need help on DIY Toccata Phono Preamp
  30. Single 6EB8 tube kit?
  31. SE OPT as PS choke
  32. Best input DHT tube?
  33. Stainless Steel Chassis Polishing
  34. Hm, which order to replace 2 out of 4 tubes?
  35. EL34 Musical Machine Output XFMR suggestions
  36. Driver stage to finals newbie questions - (I hope not dumb questions)
  37. Preamp with single 12ax7 Ecc83 for stereo?
  38. Ming-Da MC-300B845 schematic needed
  39. My RH84 Build - first amp after a 25 year break -:)
  40. Jolida 502a Snubber Mod
  41. Again
  42. KT120, PSE
  43. 6v6 bias with cathodyne
  44. How did the "magic eye" work on old valve radios ?
  45. High voltage switching
  46. High voltage switching
  47. EF184 as ccs / design questions / spice model
  48. ECC807
  49. Chassis thickness
  50. Compactron 6C10 & 6Q11/6K11 tube data
  51. Output voltage guitar preamp
  52. Reverse Engineering leads from Tube amp
  53. Did you all see this??
  54. WESTREX 60 WATT AMP
  55. Johari's audio system
  56. el95 single ended amp project needs help with preamp
  57. SS Rectifers and Zero-Crossing Distortion, possible fix or idotic idea?
  58. 3 ways active crossover
  59. 5691 tube tonal balance
  60. Dynaco Mark III chassis
  61. variac - breadboard with choke input
  62. Stancor A-8053 Output Transformer - opinions wanted!
  63. Nice OPT's for headphone amp...
  64. Eimac 304TH anode question
  65. Is WE310A > 45 > 300B PP possible?
  66. Aikido 5687 PCB - Headphone and C3
  67. Twist-lok caps?
  68. Tube RIAA(something easy)
  69. Testing power pentodes
  70. NTC THERMISTOR as SOFT START for TUBES
  71. NEW ARIA (MENG) MINI 6P1
  72. Basic schematic for Dodd Audio tube buffer?
  73. EL844
  74. 3 channel all tube preamp pedal w/fx loops for all clone build
  75. Tube CAD?
  76. Cap Problem with philco 49-1401
  77. Music Angel
  78. Help 7189A Tubes!
  79. Bulb in cathode?
  80. Gain and volume pots - newbie question
  81. Resistor test TX7525 AMRG CMF55
  82. I think I made a mistake
  83. 12at7 and 12au7
  84. PSE KT88 using Mikael's basic schematic.....
  85. PSU sanity check - negative rail?
  86. Mods Tube Amps/Pre-amp
  87. Help to find out what OPT are these
  88. LL1660 P PZ Lundahl interstage ringing problem GM70pp
  89. Possible PS chokes
  90. Adding Bal output to Akido
  91. Input impedance, the higher the better or not?
  92. Risk of DC coupled input with tube pre-amp ?
  93. UL Cascode phono
  94. DC Imbalance with the LTP
  95. More Wireless World articles archived
  96. Yaqin VK-2100 Static from one channel
  97. Direct Coupled, Self Biasing, CCS Loaded, 300B Amp
  98. Testing a 300A on a B&K
  99. Diodes to tube
  100. PL84/EL86 push pull
  101. circuit diagram
  102. Ultralinear operation
  103. 60hz hum in component system
  104. Crackling Amp
  105. Regulated Supply for Direct Coupled Amp
  106. Explanation wanted
  107. Dynaco FM1 stereo updating ?
  108. tube amp diy off. Is this a good deal?
  109. SE driver
  110. DN2540 + LM317 cascode CCS?
  111. Recapping old tube amp
  112. How a SRPP stage sounds like?
  113. Help troubleshooting SE Pentode amp
  114. What meter for Bias?
  115. Mains tranformer noise
  116. Tube tester block diagram
  117. got a custom 829b amp that i got laying around, need to know what driver to use
  118. Universal filament regulator
  119. ECC88 - 6DJ8 Cascode Plate Curves
  120. Gain of Phase Inverter
  121. CF/CCS, can it be made simpler?
  122. 2A3 Heater Hum Pot
  123. Need help - black out while the amp. was on
  124. simple question about cathodyne PI
  125. Where can I get a cover for the OPT and PS
  126. Power supply for heater
  127. how to use oscilloscope
  128. I am collecting parts for my 200w mono amps "But"
  129. This seems wrong?
  130. StoetKit Junior Schematics
  131. Valve Amplifiers 3rd edition Errata
  132. Anybody ever compared the Eico HF81 to Harman Kardon A220 "The Lute"?
  133. 6v6 datasheet
  134. Leaving filaments on?
  135. output caps -- your observations, pleeze
  136. Low gain preamp.
  137. Recommended Tube/Valve references?
  138. Stand Alone guitar power amp
  139. Tube Socket Identification
  140. Some agreement on reasonable affordable and well performing design builds?
  141. Fletcher cooke OTL article
  142. I have 4 Pl504's. Are they best used as SE or PP ?
  143. More k12g amp musings
  144. How preserve loudness circuit with new volume pot?
  145. Where to find 212E tubes???
  146. Music Angel XD-SE EL34 Amp
  147. CV345 VS EL34
  148. Reducing Filment Hum in Tubes
  149. push pull power amp
  150. 6 ohm speakers....
  151. Need a 12.6 VDC power supply schematic
  152. Gold Lion KT88 Issue
  153. Plate currents in P-P
  154. Bass preamp + Edcor balanced out = HUM!
  155. Testing amplifiers with computer software...
  156. Welborn Labs - Abysmal Service
  157. Repairing broken pins on valuable tube...
  158. Explain how feedback affects DF?
  159. Low emissions
  160. Tube Blue Glow question
  161. Common-mode choke before or after?
  162. 6l6 data sheet question
  163. Mic preamp
  164. Physical Tube Diagnosis?
  165. how and why power amps clip
  166. 80's Guitar Amp...replacing o/p tubes...which 6L6 should i try?
  167. Vacuum Tube OTL power amp!!
  168. Tube replacement options.....
  169. balanced RIAA amp
  170. power amp distortion
  171. Suggestions for 5k5 40W iron?
  172. Peavey Classic 30 Reverb headscratcher...
  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. i think its time i start playing with caps
  185. problems with preamp on home brew
  186. LS180 Tube Socket?
  187. simple question - 5V heater power supply
  188. Lineamp
  189. FI AUDİO 421 A
  190. Pete Millett has another Red Board for sale
  191. Jolida JD9 Problem
  192. 6N11 = 6N1P ?
  193. K12-G tube amp problem
  194. Please vote for one of the schematics.
  195. Advantages of separate PS for input and output stages
  196. Another PCB tube amp design
  197. Help. Replacement OPT sqrueeechhh.
  198. New concept of a power amp
  199. Lundahl and rectifier mismatch?
  200. Resurrecting weak tubes
  201. Best DHT heater?
  202. Help requested for EL84 SET amp
  203. What did I buy??
  204. Edcor and Custom Power Transformer Design
  205. What would you make with this power TX?
  206. Lundahl 1676
  207. DHT for 300B problem
  208. Newbie question about output transformer to speaker matching
  209. Red board add-on phono/RIAA pre-amp
  210. 2 Chassis amp
  211. Is It posible to bridge two quad II monoblocks?
  212. Power tube at work picture
  213. Tube SE power amp , which one??
  214. Hickok 539A issue
  215. Noise in one channel? Pioneer SX-400
  216. Hartung / Prestla OTL amps
  217. Lafayette Model 417
  218. Extreme plate load
  219. What do you think about this idea
  220. el84pse schem, need advice
  221. Video pentodes as outputs
  222. Custom Vibrolux Reverb noise issue
  223. Chinese "Audio Research" KT88s
  224. Fender bandmaster rectifire problem.
  225. New 6C33 Socket
  226. 2a3 PP output transformer
  227. PSU problem - Murphy is an ***hole!
  228. Best SET design?
  229. Anybody ever tried EBC41 as 12AX7 substitute?
  230. The 7242
  231. 12bh7a
  232. Phase Splitter Help
  233. Oscilloscope Question
  234. sizing opt
  235. 6P3C-E Datasheet help
  236. on the toroids again
  237. OPT problem or Something else 6L6 PP
  238. Look what I found!
  239. Help, Diy tube amp
  240. Idea
  241. a few DIY tube amplifier setups
  242. 6L6 PP amp motorboating
  243. Mayer-inspired 4P1L
  244. 6L6 WGB 2X34W STEREO AMPL
  245. Isolation transformation wiring project help
  246. Tube Amp DIY or Retail
  247. Supplier for GU50 tubes
  248. 2E26's
  249. Encel Stereophonic M.F.B CSM 40 amplifier
  250. Mono 300B SE Amplifier

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