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  1. Buy Tubes
  2. Placement of power amp imput resistor
  3. Brimar EL34
  4. Elekit TU-870
  5. Tube amplifier mods
  6. Stromberg-Carlson project
  7. How to design the straight load line for choke loaded tube ?
  8. OPT failure modes
  9. Life of tubes - what to expect?
  10. Profiteering from Gordan Rankin Designs
  11. Gain/Schematic Question
  12. Heath Distortion Measurement Set HD-1
  13. Tube troubleshooting question
  14. Speaker tube amp with headphones
  15. Gain of 6AK5
  16. R vs. RC on secondaries
  17. My simple 5010 amplifiers
  18. constant current sources...
  19. Critical resistors
  20. Digital tube designs?
  21. 2A3 SE Amp
  22. Dact closeout
  23. Mysterious runaway output tube
  24. Ampex 351 Power Transformer
  25. better the Pass camp?
  26. My first tube amp kit.
  27. Plate Resistor
  28. EZ81 tube rectifier
  29. 4K:10K interstage
  30. DIY in New York City
  31. can I tone control the Peavey Classic 60/60
  32. dead project, new life?
  33. Guitar overdriven preamp schematics?
  34. Interesting Read On 300B's
  35. Low voltage tubes
  36. Perser SA20 Restoration
  37. IP headroom with LTP splitter
  38. Triode strapping 6l6gc PP
  39. Question on design
  40. Peavey Classic 60/60 bias mod advice
  41. pin outs on Hammond tube amp?
  42. cathode follower
  43. Positive feedback online issue #16
  44. el84 help
  45. RIAA help
  46. Advise for my first tube amplifier, please
  47. My 50/10Y amp with hybrid PSU... am I doing the standby switch right?
  48. What can I build with this iron?
  49. Hey Planet_10 (and others)
  50. Tube sockets for Harmon-K Citation II
  51. Seeking a source for Mundorf M-caps.
  52. Question on ZZ-1000/8228
  53. noise analysis
  54. Using latching signal relay in SE guitar amp.
  55. Help wanted with fixing french DRG valve preamp....
  56. How hot are they supposed to get?
  57. EF86 Triode Mode
  58. Using a 6SL7 in a tube overdrive pedal instead of 12AX7?
  59. Guitar Amp Question!!!!! Adding Film Cap?
  60. naive questions
  61. Rozenblits Grounded grid preamp layout
  62. Help extend the life of my 805's
  63. Difference between 5687, 5687WA and 5687WB tubes?
  64. The first tube "integrated circuit" (1926)
  65. Fix loose connection in base with solder pot?
  66. 91a 300b conversion to 2a3
  67. Adams Amp Discussion, please help! :)
  68. Had a bad accident with my TT21 today.
  69. Different sound for CD Tube Player
  70. Tube audio transformer
  71. Hybrid Srpp
  72. "it is just SO hard to get bad sound from EL84 PP amp"
  73. Wire types??
  74. triode vs. pentode for pp output.
  75. 6GK5 vs. EC95/6ER5
  76. 25BQ6GTB?? Any Good?
  77. do pp output tubes have to be matched?
  78. Ampex 600 pre
  79. line-stage preamp tubes? which ones to use...
  80. Another timekiller project
  81. 6sn7GT
  82. problem with EL84 PP amp
  83. a speaker whose load varies too much for an OTL
  84. Mystery manufacturer/distributor
  85. 37s Anyone?
  86. sv811-10 push pull
  87. 416B dangerous tube?
  88. blew my amp because of distortion pedal
  89. Help with Tube Phono Output Impedance
  90. Minimum current for choke operation
  91. stored energy in output transformer?
  92. socket mounting depth
  93. Parafeeding a push pull
  94. Different direct heating styles?
  95. The most simple tube preamp
  96. Sample/hold DC servo circuit
  97. Interstage transformer as OPT?
  98. What can you do with cheap 1kV power?
  99. Marshall Super Lead MkII
  100. Flashing Rectifier Tube- Bad Thing?
  101. Amp for my speakers, PLEASE Help
  102. suitable preamp for a tube amp (kt88+12ax7)
  103. anyone know of a kit to make tube night light?
  104. Sprague capasitor id
  105. Question on Tango XE-20S
  106. 6SL7 diff pair - how to set up????
  107. Hwat should be the best driver for a 520V2 ?
  108. problem: half power on push-pull ?
  109. Screen voltage - standby cut (Roland Bolt 60)
  110. Triode Dick/FdeGrove 2A3 PP amplifier
  111. PSU for perusal
  112. Kt66 Gec Replica
  113. 6as7
  114. Please confirm my transformer math.
  115. Anything wrong with this design?
  116. Buffer Line Pre-Amp Power Tx
  117. Why filter in tube DAC?
  118. advances in tube amp design?
  119. How to determine grid leak current?
  120. dissimilar triode for White cathode follower?
  121. tube rectifier
  122. 6Vdc from 6,3Vac
  123. Computer Grade Cap or Inverter Grade Cap???
  124. Peculiar Sovtek EL34 bevaviour
  125. 5AS4 sub for 5U4
  126. Preamp hum again
  127. Modifying amp to accept different tubes (Newbie alert!)
  128. Quetion for Thorsten
  129. OPT axis
  130. Schematic Counterpoint SA3.1 and SA-9
  131. optimizing constant current heater supply
  132. Valve Art KT100
  133. baxandall tone control
  134. Kofi Annan in: "Brownin' Out!"
  135. strange tube
  136. Monarch SA-30 Schematic
  137. Power Supply for 300B Monoblock
  138. Matisse Line Amp
  139. Panel mounting on a woode case
  140. Hardware??
  141. another way to turn a pentode or tetrode into a triode
  142. 0Z4 as a rectifier?
  143. Unused HV windings on power transformer
  144. Mundorf M-Lytic and Silver-in-Oil Capacitors
  145. grainy preamp gain
  146. Need help with PS for 1626 "Darling" amp
  147. questions about power supply for 6l6 pp
  148. Proof that demagnetizing tubes works
  149. ECC88/5687/2A3 amp voltages
  150. What can I do with these? (tube and OPT question)
  151. Blowing fuses
  152. questions about transfo
  153. Common Cathode Resistor
  154. Why a Zobel network across OPT primary or secondary?
  155. Morgan Jones "Valve Amplifiers"
  156. Why?
  157. 833 push pull design help
  158. Lamm schematics
  159. Mu Followers -- ressources?
  160. Pennsylvania DIY's
  161. Interstage trans? Yes please!
  162. What's wrong with UL anyway ?
  163. SE amp like mcintosh ?
  164. 300b Push Pull Interstage Tsf
  165. amp stages...
  166. Heater supply recommendation for 6922?
  167. hi-end?
  168. Just a quicky
  169. Question on Mains Transformer
  170. Help! Who is the dirtributors of 6V4/EZ80 and 6H30/6N30?
  171. SE 6AS7 amp question
  172. Timed switch on B+ in power supply, good idea?
  173. Parts Sourcing
  174. Power Supply Question
  175. tube amp kits
  176. in search of a schematic
  177. heater wiring
  178. 5A/152M perfect driver? SPICE?
  179. 12AU7 -> 12BH7 Do I need to change Rp?
  180. Need help understanding transformer impedance ratios and impedance matching
  181. Audio schematics for GU50 ????
  182. 6sn7 & 6sn7GTB
  183. Tube amp schematic - any thoughts?
  184. tube distortion effect.
  185. tube rolling Blue Circle BC 21 preamp
  186. A sorry tale which will make you cry !!!
  187. Variac problems
  188. tubeamp project, weekend timekiller
  189. isolated supply grounding
  190. Car preamp with Aikido
  191. Audio Note M1 potentiometer question
  192. Beginner , tube kit suggestions please
  193. anyone ever used metalized polypropylene caps from Digi-key?
  194. Question on OPT
  195. Telefunken S80 Stereo ECL82 Amp- any comment?
  196. Active crossovers using Tubes
  197. 300BSE power amplifier circuit
  198. tube buffer using 12bz7
  199. "Complete" SE KT88
  200. Output Tube biasing for Toroidal Output Transformer
  201. Cardas Golden Capacitors
  202. Tube Buffer for CD-PRO2M (6922)
  203. Troubleshooting fuse blowing
  204. Billington valves and quallity
  205. Regulated PSU, your comments please.
  206. Change coupling cap from .47uf to 2.2uf
  207. RIAA Schematics?
  208. Line out for subwoofer in tube amps
  209. Feedback in IT coupled amps?
  210. Filemant Voltage
  211. DC compensated SE output transformer
  212. Winding an audio transformer
  213. Tube effects Loop Schematics... ?
  214. Scrap Heathkit W-5m for guitar amp?
  215. KT100...what's this ??
  216. Help measuring output impedience
  217. tubes
  218. Need PP KT-88 amp design and KT-88 for triode use?
  219. 7241 tube
  220. Max B+ for 807 UL?
  221. Fender amplifier.. burnt choke ??
  222. Problem with my Darling!
  223. Effect of cross-coupled "local" FB on plate load of previous stage
  224. wickedly awsome guitar amp
  225. DC coupled long tailed pairs
  226. I need an advice for these tubes..
  227. Anode Resistors on PPP Amps
  228. help with modifing a H/K A500 amp
  229. Damper Diode Musings
  230. Heater Question
  231. Push pull designs.
  232. Anybody heard about Tarzian Silicon Rectifier for Tube Rectifier Replacement?
  233. Voice of Music 555 phonograph
  234. Direct driving of GM70 by one ECL86 ???
  235. Bogen amp schematic
  236. 6336a
  237. Power transformer colors & wiring
  238. Stepped Attenuator and Selector Switch
  239. Music without speakers? Need help.
  240. el84 ultra linear datat sheet
  241. 2a3 layout
  242. Matisse Ref per amp
  243. Recommendations for Simple SET Amp Topologies
  244. HV power supply repair
  245. Grundig Model 3265U Restore?
  246. Valve Art EL 156!
  247. Classe A 6550 40W
  248. Lafayette Bypass Option
  249. Plate curves or Op Point for 6KN8?
  250. 12e1 sub for 807 ?

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