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  1. Difference between 5687, 5687WA and 5687WB tubes?
  2. The first tube "integrated circuit" (1926)
  3. Fix loose connection in base with solder pot?
  4. 91a 300b conversion to 2a3
  5. Adams Amp Discussion, please help! :)
  6. Had a bad accident with my TT21 today.
  7. Different sound for CD Tube Player
  8. Tube audio transformer
  9. Hybrid Srpp
  10. "it is just SO hard to get bad sound from EL84 PP amp"
  11. Wire types??
  12. triode vs. pentode for pp output.
  13. 6GK5 vs. EC95/6ER5
  14. 25BQ6GTB?? Any Good?
  15. do pp output tubes have to be matched?
  16. Ampex 600 pre
  17. line-stage preamp tubes? which ones to use...
  18. Another timekiller project
  19. 6sn7GT
  20. problem with EL84 PP amp
  21. a speaker whose load varies too much for an OTL
  22. Mystery manufacturer/distributor
  23. 37s Anyone?
  24. sv811-10 push pull
  25. 416B dangerous tube?
  26. blew my amp because of distortion pedal
  27. Help with Tube Phono Output Impedance
  28. Minimum current for choke operation
  29. stored energy in output transformer?
  30. socket mounting depth
  31. Parafeeding a push pull
  32. Different direct heating styles?
  33. The most simple tube preamp
  34. Sample/hold DC servo circuit
  35. Interstage transformer as OPT?
  36. What can you do with cheap 1kV power?
  37. Flashing Rectifier Tube- Bad Thing?
  38. Amp for my speakers, PLEASE Help
  39. suitable preamp for a tube amp (kt88+12ax7)
  40. anyone know of a kit to make tube night light?
  41. Sprague capasitor id
  42. Question on Tango XE-20S
  43. 6SL7 diff pair - how to set up????
  44. Hwat should be the best driver for a 520V2 ?
  45. problem: half power on push-pull ?
  46. Triode Dick/FdeGrove 2A3 PP amplifier
  47. PSU for perusal
  48. Kt66 Gec Replica
  49. 6as7
  50. Please confirm my transformer math.
  51. Anything wrong with this design?
  52. Buffer Line Pre-Amp Power Tx
  53. Why filter in tube DAC?
  54. advances in tube amp design?
  55. How to determine grid leak current?
  56. dissimilar triode for White cathode follower?
  57. tube rectifier
  58. 6Vdc from 6,3Vac
  59. Computer Grade Cap or Inverter Grade Cap???
  60. Peculiar Sovtek EL34 bevaviour
  61. 5AS4 sub for 5U4
  62. Preamp hum again
  63. Modifying amp to accept different tubes (Newbie alert!)
  64. Quetion for Thorsten
  65. OPT axis
  66. Schematic Counterpoint SA3.1 and SA-9
  67. optimizing constant current heater supply
  68. Valve Art KT100
  69. baxandall tone control
  70. Kofi Annan in: "Brownin' Out!"
  71. strange tube
  72. Monarch SA-30 Schematic
  73. Power Supply for 300B Monoblock
  74. Matisse Line Amp
  75. Panel mounting on a woode case
  76. Hardware??
  77. another way to turn a pentode or tetrode into a triode
  78. 0Z4 as a rectifier?
  79. Unused HV windings on power transformer
  80. Mundorf M-Lytic and Silver-in-Oil Capacitors
  81. grainy preamp gain
  82. Need help with PS for 1626 "Darling" amp
  83. questions about power supply for 6l6 pp
  84. Proof that demagnetizing tubes works
  85. ECC88/5687/2A3 amp voltages
  86. What can I do with these? (tube and OPT question)
  87. Blowing fuses
  88. questions about transfo
  89. Common Cathode Resistor
  90. Why a Zobel network across OPT primary or secondary?
  91. Morgan Jones "Valve Amplifiers"
  92. Why?
  93. 833 push pull design help
  94. Lamm schematics
  95. Mu Followers -- ressources?
  96. Pennsylvania DIY's
  97. Interstage trans? Yes please!
  98. What's wrong with UL anyway ?
  99. SE amp like mcintosh ?
  100. 300b Push Pull Interstage Tsf
  101. amp stages...
  102. Heater supply recommendation for 6922?
  103. hi-end?
  104. Just a quicky
  105. Question on Mains Transformer
  106. Help! Who is the dirtributors of 6V4/EZ80 and 6H30/6N30?
  107. SE 6AS7 amp question
  108. Timed switch on B+ in power supply, good idea?
  109. Parts Sourcing
  110. Power Supply Question
  111. tube amp kits
  112. in search of a schematic
  113. heater wiring
  114. 5A/152M perfect driver? SPICE?
  115. 12AU7 -> 12BH7 Do I need to change Rp?
  116. Need help understanding transformer impedance ratios and impedance matching
  117. Audio schematics for GU50 ????
  118. 6sn7 & 6sn7GTB
  119. Tube amp schematic - any thoughts?
  120. tube distortion effect.
  121. tube rolling Blue Circle BC 21 preamp
  122. A sorry tale which will make you cry !!!
  123. Variac problems
  124. tubeamp project, weekend timekiller
  125. isolated supply grounding
  126. Car preamp with Aikido
  127. Audio Note M1 potentiometer question
  128. Beginner , tube kit suggestions please
  129. Question on OPT
  130. Telefunken S80 Stereo ECL82 Amp- any comment?
  131. Active crossovers using Tubes
  132. 300BSE power amplifier circuit
  133. tube buffer using 12bz7
  134. "Complete" SE KT88
  135. Output Tube biasing for Toroidal Output Transformer
  136. Cardas Golden Capacitors
  137. Tube Buffer for CD-PRO2M (6922)
  138. Troubleshooting fuse blowing
  139. Billington valves and quallity
  140. Regulated PSU, your comments please.
  141. Change coupling cap from .47uf to 2.2uf
  142. RIAA Schematics?
  143. Line out for subwoofer in tube amps
  144. Feedback in IT coupled amps?
  145. Filemant Voltage
  146. DC compensated SE output transformer
  147. Winding an audio transformer
  148. Tube effects Loop Schematics... ?
  149. KT100...what's this ??
  150. Help measuring output impedience
  151. tubes
  152. Need PP KT-88 amp design and KT-88 for triode use?
  153. 7241 tube
  154. Max B+ for 807 UL?
  155. Problem with my Darling!
  156. Effect of cross-coupled "local" FB on plate load of previous stage
  157. DC coupled long tailed pairs
  158. I need an advice for these tubes..
  159. Anode Resistors on PPP Amps
  160. help with modifing a H/K A500 amp
  161. Damper Diode Musings
  162. Heater Question
  163. Push pull designs.
  164. Anybody heard about Tarzian Silicon Rectifier for Tube Rectifier Replacement?
  165. Voice of Music 555 phonograph
  166. Direct driving of GM70 by one ECL86 ???
  167. Bogen amp schematic
  168. 6336a
  169. Power transformer colors & wiring
  170. Stepped Attenuator and Selector Switch
  171. Music without speakers? Need help.
  172. el84 ultra linear datat sheet
  173. 2a3 layout
  174. Matisse Ref per amp
  175. Recommendations for Simple SET Amp Topologies
  176. HV power supply repair
  177. Grundig Model 3265U Restore?
  178. Valve Art EL 156!
  179. Classe A 6550 40W
  180. Lafayette Bypass Option
  181. Plate curves or Op Point for 6KN8?
  182. 12e1 sub for 807 ?
  183. Extremely low power and low loss transformers
  184. looking for power supply diagram SE 813 45 Watt
  185. How to make this 6C33C better??
  186. All octal 6AS7 PP amp is it possible?
  187. Toroids VS EI Transfomers
  188. Bias secrets for a HH Scott 233?!?
  189. new idea of DHT heater supply
  190. Eastern Audio transformers: any good?
  191. UL40-S2 schematic
  192. Tube monster amplifier
  193. Big pentode help!
  194. which one?
  195. system matching
  196. a 5ar4 problem
  197. coupling capacitor intermediate values
  198. Quicksilver Mono 60 upgrades
  199. Can anything be done
  200. OTL ECC88 amp
  201. Bridging Mono Blocks
  202. Cathode-coupled Phase Splitter Formula
  203. Drd 45, 300b
  204. SV572-30: Opinions?
  205. Poor man's transformer volume control?
  206. Output current of this CAT SL-1 schematic ?
  207. Fixed Bias Circuit for 300B
  208. want to build SE450TL
  209. Tubes lifetime and sound
  210. Heater supply problem?
  211. Lowering HV secondary on Power Transformer
  212. Van der Veen 70W tube Amp DIY
  213. 5751 for marantz 7 linestage
  214. To be or not to be, UL or quad?
  215. Tube Failure
  216. 12AX7 Compared!
  217. transformer case grounding
  218. pre/amplifier grounding
  219. First Time Amp
  220. 6ck4 pp amp
  221. JJ electros, any good?
  222. fun with amps
  223. Newbie needs clarification
  224. looking for powerful Single Ended diagram.
  225. Power amp output newbie question
  226. SE ultralinear amplifier generate a lot of Odd harmonics ?
  227. Grounding Filament CT?
  228. one more 12B4A preamp
  229. 6V6PP -> 6L6 PP with triode connection.
  230. ? about powering a sub with a Fisher 30a mono amp.
  231. Pin out conversion 6V6-6AQ5A
  232. 211
  233. Nice looking rectifier tubes help
  234. Stepped attenuator inquiry
  235. Designing a Phonostage with the S&B 10K LCR RIAA Module
  236. 211 tube
  237. The T-Rex SET Amplifier DIY project
  238. Strange Wiring in Bogen 6v6 PP
  239. 6AS7 amp schematics
  240. Blue glow confused :(
  241. 6V6 SE and Screen Grid Voltage
  242. 6BQ5 <-> 6V6 without socket job...Any Idea?
  243. Melbourne, Australia valve enthusiasts check in!
  244. HELP! Blown R + HIGH V!
  245. PCB Pad Layout for B9A Noval
  246. DIY tube amps - help??
  247. New home made S.E amps
  248. Amplifier Oscillation
  249. First project, need guidance
  250. Cap max value after 6X5GT/EZ35 rectifier?

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