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  1. Field of Dreams (a pair of FRT502 modulators)
  2. cathode follower
  3. ECC808- what is it more like?
  4. Help needed to find these rare values!
  5. New PP amp just completed - a few unusual features (long)
  6. MKP VS Electrolyte
  7. is 5mA too low???
  8. Dynaco FM3 220v-120v
  9. does plate current/voltage effect tube sound????
  10. Any opinions on the ECC81?
  11. #26 line stage help
  12. coupling caps? RTX vs Jupiter wax
  13. MC275 Hum Conundrum
  14. We91a
  15. Is 50 degrees C too hot?
  16. Using LEDs to bias grid voltage?
  17. DIY Hybride amplifiers
  18. wa i popped a tube lol
  19. 6C33C substitute
  20. Resistor popped...need help for replacement in Yaqin amp
  21. Check this eye candy out....
  22. Russian 5U4GB
  23. simple phono preamp circuit needed
  24. Black gate PS capacitors
  25. amp troubles
  26. Instruments Of Amplification - DIY
  27. my EL84 pre-amp with schematic
  28. Hammond AO29 to guitar amp?
  29. Radical (insane) PSU ideas
  30. First Tube Amp Considerations...
  31. hardcore tube night light?
  32. Frankenstein tube amp
  33. Can I use this tube?
  34. help for DHT bias in PP
  35. Multiple projects
  36. recommend operating point for EL84?
  37. First time builder, need advice.
  38. Tube Depot...
  39. schematics
  40. BOGEN MX60A Schematic
  41. Help with 1626 PSE Amp needed
  42. OTL question.
  43. diy tube amp
  44. Load line for CF
  45. DIY Vacuum tube amp
  46. Hammond or James OPT for SE 300B ?
  47. PSE 6550 schematic needed
  48. Schematic for Siemens "Table" Amplifier
  49. power supply for 6922 mu follower
  50. Dead simple tube circuit
  51. Any info on a Musical Fidelity X-Pre?
  52. Autoformer CF amp
  53. 2a3 or otl on an fullrange coral
  54. My New Project Completed
  55. SE el84
  56. Many thanks!
  57. Switching power supply & filament
  58. tube phono amp req'd
  59. Had a strange problem today...
  60. wsw siemens ultralinear 815 410 G !!?!
  61. Bottlehead Gear
  62. Amp, Stange temporary buzz, what is that?
  63. 2a3 schematic
  64. NEWBIE needs help-static in one channel of preamp
  65. Vintage speaker screw outs to 1/4" plug
  66. Flashing EL34
  67. Sovtek 2A3 tolerances / defected tube?
  68. Massive Parallel Operating
  69. filter circuit for 866a
  70. reasonable powered simple amp
  71. 6c19pi ?
  72. S5 Electronics 139 $ tube amp
  73. 12AU7 or 12AT7 instead of 12AX7 ?
  74. Tube Pre-Amp < $200
  75. Modification of 2A3 SE Circuit
  76. beta followers
  77. Q: Stereo Amp / Dual PS Chokes
  78. using Mosfets as diode in PS
  79. Sonic Frontiers Power 2SE
  80. Curcio daniel
  81. Ecc89 / Ecc189
  82. Magnavox
  83. Tube Preamp 'Clone' PCB copys on ebay (Marantz, McIntosh, etc)
  84. tube rectifier life expectancy
  85. Metal VS Glass
  86. does anybody know this transfo?
  87. need help finding tube make
  88. VTL deluxe 300 amps - adjustment question
  89. Building Marshall Plexi
  90. help converting conrad johnson MV-55 into triode!
  91. Does more tubes = more filter capacitors?
  92. 6V6 GT, Do they worth playing with them ??
  93. 12ax7 > 6sn7 > 300b
  94. calculating NFB dB
  95. PCL806 is equivalen to PCL86?
  96. anti digitalizing process
  97. Telefunken?
  98. Bogen MX30A
  99. base for amp
  100. Unbalanced - Balanced Tube Preamplifier wanted
  101. rusty iron- need help :)
  102. A new/old CCS?
  103. Rogers Cadet III - balance control
  104. Anyone tried Van Alstine's OmegaStar Bridge?
  105. Plasma/ion tweeters
  106. PP 6B4G stereo amp filament question
  107. tube tone control?
  108. trio amp up in smoke-ya really up
  109. Ideas for SE amp with this tube
  110. regulated PS - with Zener diode
  111. Filament voltage of PP2A3
  112. Dennis Boyle, Alliance Audio
  113. How do I replace this 40+ year old selenium rectifier?
  114. please advise on operating point of a 5687
  115. Output Transformer Question
  116. Stepped attenuator
  117. PP2A3 amp options
  118. Need advice: Want to learn Vacuum tubes
  119. AVO CT-160 --- Help
  120. Needed schematic....
  121. Az1 mounted on wood!
  122. Dynaco A450 specs
  123. Ecc186= SQ Ecc82
  124. tube amp kit on 230 v???
  125. some tubes
  126. ppp el84 fixed bias schematics
  127. Tube buffered NIGC trafo thoughs?
  128. driver stage
  129. PS cap placement/type
  130. Vintage OPT
  131. simple, single-ended project
  132. 6sn7 - 6bx7 - sv811-3 amp
  133. I look for a correct driver stage
  134. PCB tubes amp?
  135. XLR to 1/4" TRS?
  136. Umbilical Connector Suggestions
  137. Good Inexpensive Starter Amp Kit
  138. tube rectified preamp schematic
  139. oxygen free interconnects
  140. how to calculate feedback resistor
  141. Topaz Isolation Tranny
  142. 4E27A monster se amp??
  143. 6V6 Parafeed?
  144. Old Tranny Potting Material
  145. Brimar ECC81
  146. PCB mounting B7G sockets
  147. Directly heated cathodes, but why?
  148. SET kit for newbie
  149. High Power 805 Triode based amplifier
  150. DigitalSignalProcessing -&gt; future?
  151. 5v Damper Diode?
  152. Tubes in Class D amplifiers
  153. Universal power supply UIP-1 from former USSR schematics
  154. Building a fender twin reverb in the UK
  155. First project for Proac loudspeakers
  156. transformers
  157. cathode battery bias questions
  158. tube amp project
  159. AN DacKit 1.2 Upgrade Ideas
  160. What are the requirements for driving a 300B?
  161. 900v. 100ma. Power supply for 813 tube amplifier
  162. Chassis Internal Height / Pot Clearance
  163. Bogen help
  164. Tube tester questions
  165. 211 VT-4C Good Simple SE Schematic
  166. mosfet in regulated PS.
  167. Hammond Transformer in Toronto
  168. 6n30pi plate resistance ?
  169. balanced input stage
  170. A better triode strap?
  171. Chinese new 845
  172. what tube manufacture of 6550??
  173. Low frequency noise in a 12B4 preamp
  174. Difference between CK6528 and 6528A ?
  175. 6L6 help needed
  176. Hawksford style error correcting output
  177. SE UL OT - primary wired in reverse
  178. tube bias pot question
  179. Transformer supplier in Australia
  180. Newb here
  181. Anyone familiar with James output transformers?
  182. What Limits Freqency response in a simple tube amp like the zen?
  183. Grid driven (ETM) KT88 SE amp design - final works on paper
  184. Sansui 1000 outputs?
  185. The overlooked is often cheaper
  186. Fender 6L6 Amp... HELP!!!
  187. Tube amp design characteristics?
  188. ecc40 or 76 as driver for 2A3
  189. toroids on top of each other ?
  190. Out Of Order
  191. Pinging JAX (Sweden)
  192. Common Cathode 6922 output impedance?
  193. Blue Velvet Preamp
  194. Has anyone got any plans for a car amp?
  195. Tube Radio Kit
  196. New Tube Porn!!
  197. Need someone to host my "TUBE PORN" images.
  198. Trying to understand preamp schematic...
  199. 6C33C schematic
  200. We have liftoff!!!! Houston, all systems are go!
  201. Dynaco ST70
  202. Is Tesla still going?
  203. yet another 12b4a
  204. Tubes load resistance and output trans impedance
  205. Antique schematic help please.
  206. 12b4a wiring question
  207. $1 AMP find
  208. Heater winding load question.
  209. Direct Coupling Modulated Bias (SET)
  210. Amp with 6c33
  211. Ideas for amp rebuild...
  212. simple tube amp
  213. What's the ideal tube amplifier for me for max. $660 , maybe a kit ?
  214. CCS design help!!
  215. Proposed Transfomer/Valve Layout
  216. Mic input for guitar?
  217. My darling is giving me hell!
  218. EL84 or 6v6 or something else?
  219. Borbely hybrid phono
  220. SS power supply question
  221. RCA Tube Radio...circa 1930-40
  222. New project on 807
  223. SE design using 10k OPTs
  224. Biasing a cathode follower?
  225. Lower Distortion Alternatives to 12AT7 & 12AU7 ?
  226. Oil in Paper in oil capacitor.
  227. Valves for Crackly Fender Hot Rod
  228. Information needed
  229. Hybrid
  230. heavy metal, low power guitar amp?
  231. found two boxes of GE 6CL6 tubes
  232. Please help me compare 2 cattle of fish...
  233. Vacuum Tube Valley 6SN7 preamp
  234. SET Power Supply Regulation
  235. TubeCAD
  236. 60 Hz noise in modified Audible Illusions M2B
  237. Anodized Aluminum and Glue/Epoxy
  238. shared parts between channels
  239. May I use 5K transformer for Dynaco III amp?
  240. First amp build questions
  241. Help needed changing from srpp5814a to srpp12bh7a
  242. ok, i'll try and make it simple.
  243. Sure, copy an amp. . . It'd work but I'm looking for something different.
  244. Half a bee Philosophically. . . Er sorry Its actually about ECC83 amps
  245. Bogan schematic for HO 50 power Amp
  246. Gibson GA-15RV tube amp
  247. Can VT-185 be applied in audio circuit?
  248. Best PP transformer for 2A3 amp?
  249. help in finding tubetester meter value
  250. B+ Voltage

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