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  1. EF86 Triode Mode
  2. Using a 6SL7 in a tube overdrive pedal instead of 12AX7?
  3. naive questions
  4. Rozenblits Grounded grid preamp layout
  5. Help extend the life of my 805's
  6. Difference between 5687, 5687WA and 5687WB tubes?
  7. The first tube "integrated circuit" (1926)
  8. Fix loose connection in base with solder pot?
  9. 91a 300b conversion to 2a3
  10. Adams Amp Discussion, please help! :)
  11. Had a bad accident with my TT21 today.
  12. Different sound for CD Tube Player
  13. Tube audio transformer
  14. Hybrid Srpp
  15. "it is just SO hard to get bad sound from EL84 PP amp"
  16. Wire types??
  17. triode vs. pentode for pp output.
  18. 6GK5 vs. EC95/6ER5
  19. 25BQ6GTB?? Any Good?
  20. do pp output tubes have to be matched?
  21. Ampex 600 pre
  22. line-stage preamp tubes? which ones to use...
  23. Another timekiller project
  24. 6sn7GT
  25. problem with EL84 PP amp
  26. a speaker whose load varies too much for an OTL
  27. Mystery manufacturer/distributor
  28. 37s Anyone?
  29. sv811-10 push pull
  30. 416B dangerous tube?
  31. blew my amp because of distortion pedal
  32. Help with Tube Phono Output Impedance
  33. Minimum current for choke operation
  34. stored energy in output transformer?
  35. socket mounting depth
  36. Parafeeding a push pull
  37. Different direct heating styles?
  38. The most simple tube preamp
  39. Sample/hold DC servo circuit
  40. Interstage transformer as OPT?
  41. What can you do with cheap 1kV power?
  42. Flashing Rectifier Tube- Bad Thing?
  43. Amp for my speakers, PLEASE Help
  44. suitable preamp for a tube amp (kt88+12ax7)
  45. anyone know of a kit to make tube night light?
  46. Sprague capasitor id
  47. Question on Tango XE-20S
  48. 6SL7 diff pair - how to set up????
  49. Hwat should be the best driver for a 520V2 ?
  50. problem: half power on push-pull ?
  51. Triode Dick/FdeGrove 2A3 PP amplifier
  52. PSU for perusal
  53. Kt66 Gec Replica
  54. 6as7
  55. Please confirm my transformer math.
  56. Anything wrong with this design?
  57. Buffer Line Pre-Amp Power Tx
  58. Why filter in tube DAC?
  59. advances in tube amp design?
  60. How to determine grid leak current?
  61. dissimilar triode for White cathode follower?
  62. tube rectifier
  63. 6Vdc from 6,3Vac
  64. Computer Grade Cap or Inverter Grade Cap???
  65. Peculiar Sovtek EL34 bevaviour
  66. 5AS4 sub for 5U4
  67. Preamp hum again
  68. Modifying amp to accept different tubes (Newbie alert!)
  69. Quetion for Thorsten
  70. OPT axis
  71. Schematic Counterpoint SA3.1 and SA-9
  72. optimizing constant current heater supply
  73. Valve Art KT100
  74. baxandall tone control
  75. Kofi Annan in: "Brownin' Out!"
  76. strange tube
  77. Monarch SA-30 Schematic
  78. Power Supply for 300B Monoblock
  79. Matisse Line Amp
  80. Panel mounting on a woode case
  81. Hardware??
  82. another way to turn a pentode or tetrode into a triode
  83. 0Z4 as a rectifier?
  84. Unused HV windings on power transformer
  85. Mundorf M-Lytic and Silver-in-Oil Capacitors
  86. grainy preamp gain
  87. Need help with PS for 1626 "Darling" amp
  88. questions about power supply for 6l6 pp
  89. Proof that demagnetizing tubes works
  90. ECC88/5687/2A3 amp voltages
  91. What can I do with these? (tube and OPT question)
  92. Blowing fuses
  93. questions about transfo
  94. Common Cathode Resistor
  95. Why a Zobel network across OPT primary or secondary?
  96. Morgan Jones "Valve Amplifiers"
  97. Why?
  98. 833 push pull design help
  99. Lamm schematics
  100. Mu Followers -- ressources?
  101. Pennsylvania DIY's
  102. Interstage trans? Yes please!
  103. What's wrong with UL anyway ?
  104. SE amp like mcintosh ?
  105. 300b Push Pull Interstage Tsf
  106. amp stages...
  107. Heater supply recommendation for 6922?
  108. hi-end?
  109. Just a quicky
  110. Question on Mains Transformer
  111. Help! Who is the dirtributors of 6V4/EZ80 and 6H30/6N30?
  112. SE 6AS7 amp question
  113. Timed switch on B+ in power supply, good idea?
  114. Parts Sourcing
  115. Power Supply Question
  116. tube amp kits
  117. in search of a schematic
  118. heater wiring
  119. 5A/152M perfect driver? SPICE?
  120. 12AU7 -> 12BH7 Do I need to change Rp?
  121. Need help understanding transformer impedance ratios and impedance matching
  122. Audio schematics for GU50 ????
  123. 6sn7 & 6sn7GTB
  124. Tube amp schematic - any thoughts?
  125. tube distortion effect.
  126. tube rolling Blue Circle BC 21 preamp
  127. A sorry tale which will make you cry !!!
  128. Variac problems
  129. tubeamp project, weekend timekiller
  130. isolated supply grounding
  131. Car preamp with Aikido
  132. Audio Note M1 potentiometer question
  133. Beginner , tube kit suggestions please
  134. Question on OPT
  135. Telefunken S80 Stereo ECL82 Amp- any comment?
  136. Active crossovers using Tubes
  137. 300BSE power amplifier circuit
  138. tube buffer using 12bz7
  139. "Complete" SE KT88
  140. Output Tube biasing for Toroidal Output Transformer
  141. Cardas Golden Capacitors
  142. Tube Buffer for CD-PRO2M (6922)
  143. Troubleshooting fuse blowing
  144. Billington valves and quallity
  145. Regulated PSU, your comments please.
  146. Change coupling cap from .47uf to 2.2uf
  147. RIAA Schematics?
  148. Line out for subwoofer in tube amps
  149. Feedback in IT coupled amps?
  150. Filemant Voltage
  151. DC compensated SE output transformer
  152. Winding an audio transformer
  153. Tube effects Loop Schematics... ?
  154. KT100...what's this ??
  155. Help measuring output impedience
  156. tubes
  157. Need PP KT-88 amp design and KT-88 for triode use?
  158. 7241 tube
  159. Max B+ for 807 UL?
  160. Problem with my Darling!
  161. Effect of cross-coupled "local" FB on plate load of previous stage
  162. DC coupled long tailed pairs
  163. I need an advice for these tubes..
  164. Anode Resistors on PPP Amps
  165. help with modifing a H/K A500 amp
  166. Damper Diode Musings
  167. Heater Question
  168. Push pull designs.
  169. Anybody heard about Tarzian Silicon Rectifier for Tube Rectifier Replacement?
  170. Voice of Music 555 phonograph
  171. Direct driving of GM70 by one ECL86 ???
  172. Bogen amp schematic
  173. 6336a
  174. Power transformer colors & wiring
  175. Stepped Attenuator and Selector Switch
  176. Music without speakers? Need help.
  177. el84 ultra linear datat sheet
  178. 2a3 layout
  179. Matisse Ref per amp
  180. Recommendations for Simple SET Amp Topologies
  181. HV power supply repair
  182. Grundig Model 3265U Restore?
  183. Valve Art EL 156!
  184. Classe A 6550 40W
  185. Lafayette Bypass Option
  186. Plate curves or Op Point for 6KN8?
  187. 12e1 sub for 807 ?
  188. Extremely low power and low loss transformers
  189. looking for power supply diagram SE 813 45 Watt
  190. How to make this 6C33C better??
  191. All octal 6AS7 PP amp is it possible?
  192. Toroids VS EI Transfomers
  193. Bias secrets for a HH Scott 233?!?
  194. new idea of DHT heater supply
  195. Eastern Audio transformers: any good?
  196. UL40-S2 schematic
  197. Tube monster amplifier
  198. Big pentode help!
  199. which one?
  200. system matching
  201. a 5ar4 problem
  202. coupling capacitor intermediate values
  203. Quicksilver Mono 60 upgrades
  204. Can anything be done
  205. OTL ECC88 amp
  206. Bridging Mono Blocks
  207. Cathode-coupled Phase Splitter Formula
  208. Drd 45, 300b
  209. SV572-30: Opinions?
  210. Poor man's transformer volume control?
  211. Output current of this CAT SL-1 schematic ?
  212. Fixed Bias Circuit for 300B
  213. want to build SE450TL
  214. Tubes lifetime and sound
  215. Heater supply problem?
  216. Lowering HV secondary on Power Transformer
  217. Van der Veen 70W tube Amp DIY
  218. 5751 for marantz 7 linestage
  219. To be or not to be, UL or quad?
  220. Tube Failure
  221. 12AX7 Compared!
  222. transformer case grounding
  223. pre/amplifier grounding
  224. First Time Amp
  225. 6ck4 pp amp
  226. JJ electros, any good?
  227. fun with amps
  228. Newbie needs clarification
  229. looking for powerful Single Ended diagram.
  230. Power amp output newbie question
  231. SE ultralinear amplifier generate a lot of Odd harmonics ?
  232. Grounding Filament CT?
  233. one more 12B4A preamp
  234. 6V6PP -> 6L6 PP with triode connection.
  235. ? about powering a sub with a Fisher 30a mono amp.
  236. Pin out conversion 6V6-6AQ5A
  237. 211
  238. Nice looking rectifier tubes help
  239. Stepped attenuator inquiry
  240. Designing a Phonostage with the S&B 10K LCR RIAA Module
  241. 211 tube
  242. The T-Rex SET Amplifier DIY project
  243. Strange Wiring in Bogen 6v6 PP
  244. 6AS7 amp schematics
  245. Blue glow confused :(
  246. 6V6 SE and Screen Grid Voltage
  247. 6BQ5 <-> 6V6 without socket job...Any Idea?
  248. Melbourne, Australia valve enthusiasts check in!
  249. HELP! Blown R + HIGH V!
  250. PCB Pad Layout for B9A Noval

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