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  1. what's my fisher 400 off gassing?
  2. Executone schematic needed
  3. parafeed output amplifier
  4. B+K 500 Testor Question
  5. CCCP SUBTUBE: my last project
  6. Aikido Line-Stage jumper question
  7. Tube Amplifier to power Gale GS401 speakers
  8. Bypass Cap on cathode?
  9. How to measure/calculate dB of negative feedback?
  10. Need your advices & experiences
  11. Parmeko gresham transformers specifications
  12. Valve cascodes for Phono input.
  13. ST-70 XLR Balanced Driver Boad
  14. I'm new here any places for like us newbies?
  15. Noob looking for some advice
  16. Stand Alone guitar power amp for evaluation
  17. QQE04/5 Curves
  18. Help on Audio Research D79A adjustment
  19. lazarus preamp hums even with volume down and no components connected.
  20. Troubles when elevating a LT supply
  21. Turning up the heat: cathode bias
  22. Anyone build Dynaco Mk IIIs with Sullivan boards?
  23. Lowering gain on Frank's 6SN7 preamp
  24. Pro amp input modification
  25. Sanity of compactron for "integrated" headphone amp?
  26. vdc drop
  27. HELP - SMART 845 or 300B SE
  28. DC Servo - Direct Coupling Applications?
  29. Edison 12 amplifier
  30. Mounting terminal strips to blank copper board
  31. 6C33C tube socket for GM70 tube??
  32. Fisher X100C 2 sets speakers?
  33. 4P1L DHT Line Stage
  34. Trying to identify an old radio tube
  35. Yaqin CD3 upgrading caps help for novice
  36. push pull adjustable fixed bias
  37. Another SE amp design.
  38. Chassis to experiment with....
  39. Ray Butts Echosonic #27
  40. Ampeg Reverberocket II Hum
  41. What coupling capacitor values are common
  42. Yamamoto A-09s
  43. 9001 variant of Acorn 954 Pentode
  44. Khron-Hite UHR220 tube power source
  45. Grounding the 4ohm tap
  46. Rectifier mechanical buzz
  47. Informed opinion(s) on phase inversion?
  48. Computer grade electrolytics
  49. Strange problem with Grundig CS200 tube receiver
  50. Puresound P10 RIAA
  51. Need help on DIY Toccata Phono Preamp
  52. Single 6EB8 tube kit?
  53. SE OPT as PS choke
  54. Best input DHT tube?
  55. Stainless Steel Chassis Polishing
  56. Hm, which order to replace 2 out of 4 tubes?
  57. EL34 Musical Machine Output XFMR suggestions
  58. Driver stage to finals newbie questions - (I hope not dumb questions)
  59. Preamp with single 12ax7 Ecc83 for stereo?
  60. Ming-Da MC-300B845 schematic needed
  61. My RH84 Build - first amp after a 25 year break -:)
  62. Jolida 502a Snubber Mod
  63. Again
  64. KT120, PSE
  65. 6v6 bias with cathodyne
  66. How did the "magic eye" work on old valve radios ?
  67. High voltage switching
  68. High voltage switching
  69. EF184 as ccs / design questions / spice model
  70. ECC807
  71. Chassis thickness
  72. Compactron 6C10 & 6Q11/6K11 tube data
  73. Output voltage guitar preamp
  74. Reverse Engineering leads from Tube amp
  75. Did you all see this??
  76. WESTREX 60 WATT AMP
  77. Johari's audio system
  78. el95 single ended amp project needs help with preamp
  79. SS Rectifers and Zero-Crossing Distortion, possible fix or idotic idea?
  80. 3 ways active crossover
  81. 5691 tube tonal balance
  82. Dynaco Mark III chassis
  83. variac - breadboard with choke input
  84. Stancor A-8053 Output Transformer - opinions wanted!
  85. Nice OPT's for headphone amp...
  86. Eimac 304TH anode question
  87. Is WE310A > 45 > 300B PP possible?
  88. Aikido 5687 PCB - Headphone and C3
  89. Twist-lok caps?
  90. Tube RIAA(something easy)
  91. Testing power pentodes
  92. NTC THERMISTOR as SOFT START for TUBES
  93. NEW ARIA (MENG) MINI 6P1
  94. Basic schematic for Dodd Audio tube buffer?
  95. EL844
  96. 3 channel all tube preamp pedal w/fx loops for all clone build
  97. Tube CAD?
  98. Cap Problem with philco 49-1401
  99. Music Angel
  100. Help 7189A Tubes!
  101. Bulb in cathode?
  102. Gain and volume pots - newbie question
  103. Resistor test TX7525 AMRG CMF55
  104. I think I made a mistake
  105. 12at7 and 12au7
  106. PSE KT88 using Mikael's basic schematic.....
  107. PSU sanity check - negative rail?
  108. Mods Tube Amps/Pre-amp
  109. Help to find out what OPT are these
  110. LL1660 P PZ Lundahl interstage ringing problem GM70pp
  111. Possible PS chokes
  112. Adding Bal output to Akido
  113. Input impedance, the higher the better or not?
  114. Risk of DC coupled input with tube pre-amp ?
  115. UL Cascode phono
  116. DC Imbalance with the LTP
  117. More Wireless World articles archived
  118. Yaqin VK-2100 Static from one channel
  119. Direct Coupled, Self Biasing, CCS Loaded, 300B Amp
  120. Testing a 300A on a B&K
  121. Diodes to tube
  122. PL84/EL86 push pull
  123. circuit diagram
  124. Ultralinear operation
  125. 60hz hum in component system
  126. Crackling Amp
  127. Regulated Supply for Direct Coupled Amp
  128. Explanation wanted
  129. Dynaco FM1 stereo updating ?
  130. tube amp diy off. Is this a good deal?
  131. SE driver
  132. DN2540 + LM317 cascode CCS?
  133. Recapping old tube amp
  134. How a SRPP stage sounds like?
  135. Help troubleshooting SE Pentode amp
  136. What meter for Bias?
  137. Mains tranformer noise
  138. Tube tester block diagram
  139. got a custom 829b amp that i got laying around, need to know what driver to use
  140. Universal filament regulator
  141. ECC88 - 6DJ8 Cascode Plate Curves
  142. Gain of Phase Inverter
  143. CF/CCS, can it be made simpler?
  144. 2A3 Heater Hum Pot
  145. Need help - black out while the amp. was on
  146. simple question about cathodyne PI
  147. Where can I get a cover for the OPT and PS
  148. Power supply for heater
  149. how to use oscilloscope
  150. I am collecting parts for my 200w mono amps "But"
  151. This seems wrong?
  152. StoetKit Junior Schematics
  153. Valve Amplifiers 3rd edition Errata
  154. Anybody ever compared the Eico HF81 to Harman Kardon A220 "The Lute"?
  155. 6v6 datasheet
  156. Leaving filaments on?
  157. output caps -- your observations, pleeze
  158. Low gain preamp.
  159. Recommended Tube/Valve references?
  160. Stand Alone guitar power amp
  161. Tube Socket Identification
  162. Some agreement on reasonable affordable and well performing design builds?
  163. Fletcher cooke OTL article
  164. I have 4 Pl504's. Are they best used as SE or PP ?
  165. More k12g amp musings
  166. How preserve loudness circuit with new volume pot?
  167. Where to find 212E tubes???
  168. Music Angel XD-SE EL34 Amp
  169. CV345 VS EL34
  170. Reducing Filment Hum in Tubes
  171. push pull power amp
  172. 6 ohm speakers....
  173. Need a 12.6 VDC power supply schematic
  174. Gold Lion KT88 Issue
  175. Plate currents in P-P
  176. Bass preamp + Edcor balanced out = HUM!
  177. Testing amplifiers with computer software...
  178. Welborn Labs - Abysmal Service
  179. Repairing broken pins on valuable tube...
  180. Explain how feedback affects DF?
  181. Low emissions
  182. Tube Blue Glow question
  183. Common-mode choke before or after?
  184. 6l6 data sheet question
  185. Mic preamp
  186. Physical Tube Diagnosis?
  187. how and why power amps clip
  188. 80's Guitar Amp...replacing o/p tubes...which 6L6 should i try?
  189. Vacuum Tube OTL power amp!!
  190. Tube replacement options.....
  191. balanced RIAA amp
  192. power amp distortion
  193. Suggestions for 5k5 40W iron?
  194. Peavey Classic 30 Reverb headscratcher...
  195. Schematic Tube Analog Output Stage???
  196. 300B 'direct drive' using a 6U8..
  197. Magnavox 88-02 power trans ratings?
  198. Preamp with humming noise!
  199. How to choose line out transformer?
  200. Tools for Cutting Tube Socket Holes?
  201. Switchable SE.
  202. GZ33 in place of 5U4 can it be done?
  203. phase splitter issue
  204. Armstrong A10 MK2 EL34 mono block
  205. "Ug" The Transformer
  206. i think its time i start playing with caps
  207. problems with preamp on home brew
  208. LS180 Tube Socket?
  209. simple question - 5V heater power supply
  210. Lineamp
  211. FI AUDİO 421 A
  212. Pete Millett has another Red Board for sale
  213. Jolida JD9 Problem
  214. 6N11 = 6N1P ?
  215. K12-G tube amp problem
  216. Please vote for one of the schematics.
  217. Advantages of separate PS for input and output stages
  218. Another PCB tube amp design
  219. Help. Replacement OPT sqrueeechhh.
  220. New concept of a power amp
  221. Lundahl and rectifier mismatch?
  222. Resurrecting weak tubes
  223. Best DHT heater?
  224. Help requested for EL84 SET amp
  225. What did I buy??
  226. Edcor and Custom Power Transformer Design
  227. What would you make with this power TX?
  228. Lundahl 1676
  229. DHT for 300B problem
  230. Newbie question about output transformer to speaker matching
  231. Red board add-on phono/RIAA pre-amp
  232. 2 Chassis amp
  233. Is It posible to bridge two quad II monoblocks?
  234. Power tube at work picture
  235. Tube SE power amp , which one??
  236. Hickok 539A issue
  237. Noise in one channel? Pioneer SX-400
  238. Hartung / Prestla OTL amps
  239. Lafayette Model 417
  240. Extreme plate load
  241. What do you think about this idea
  242. el84pse schem, need advice
  243. Video pentodes as outputs
  244. Custom Vibrolux Reverb noise issue
  245. Chinese "Audio Research" KT88s
  246. Fender bandmaster rectifire problem.
  247. New 6C33 Socket
  248. 2a3 PP output transformer
  249. PSU problem - Murphy is an ***hole!
  250. Best SET design?

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