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  1. Life of tubes - what to expect?
  2. Profiteering from Gordan Rankin Designs
  3. Gain/Schematic Question
  4. Heath Distortion Measurement Set HD-1
  5. Tube troubleshooting question
  6. Speaker tube amp with headphones
  7. Gain of 6AK5
  8. R vs. RC on secondaries
  9. My simple 5010 amplifiers
  10. constant current sources...
  11. Critical resistors
  12. Digital tube designs?
  13. 2A3 SE Amp
  14. Dact closeout
  15. Mysterious runaway output tube
  16. Ampex 351 Power Transformer
  17. better the Pass camp?
  18. My first tube amp kit.
  19. Plate Resistor
  20. EZ81 tube rectifier
  21. 4K:10K interstage
  22. DIY in New York City
  23. can I tone control the Peavey Classic 60/60
  24. dead project, new life?
  25. Guitar overdriven preamp schematics?
  26. Interesting Read On 300B's
  27. Low voltage tubes
  28. Perser SA20 Restoration
  29. IP headroom with LTP splitter
  30. Triode strapping 6l6gc PP
  31. Question on design
  32. Peavey Classic 60/60 bias mod advice
  33. pin outs on Hammond tube amp?
  34. cathode follower
  35. Positive feedback online issue #16
  36. el84 help
  37. RIAA help
  38. Advise for my first tube amplifier, please
  39. My 50/10Y amp with hybrid PSU... am I doing the standby switch right?
  40. What can I build with this iron?
  41. Hey Planet_10 (and others)
  42. Tube sockets for Harmon-K Citation II
  43. Seeking a source for Mundorf M-caps.
  44. Question on ZZ-1000/8228
  45. noise analysis
  46. Using latching signal relay in SE guitar amp.
  47. Help wanted with fixing french DRG valve preamp....
  48. How hot are they supposed to get?
  49. EF86 Triode Mode
  50. Using a 6SL7 in a tube overdrive pedal instead of 12AX7?
  51. Guitar Amp Question!!!!! Adding Film Cap?
  52. naive questions
  53. Rozenblits Grounded grid preamp layout
  54. Help extend the life of my 805's
  55. Difference between 5687, 5687WA and 5687WB tubes?
  56. The first tube "integrated circuit" (1926)
  57. Fix loose connection in base with solder pot?
  58. 91a 300b conversion to 2a3
  59. Adams Amp Discussion, please help! :)
  60. Had a bad accident with my TT21 today.
  61. Different sound for CD Tube Player
  62. Tube audio transformer
  63. Hybrid Srpp
  64. "it is just SO hard to get bad sound from EL84 PP amp"
  65. Wire types??
  66. triode vs. pentode for pp output.
  67. 6GK5 vs. EC95/6ER5
  68. 25BQ6GTB?? Any Good?
  69. do pp output tubes have to be matched?
  70. Ampex 600 pre
  71. line-stage preamp tubes? which ones to use...
  72. Another timekiller project
  73. 6sn7GT
  74. problem with EL84 PP amp
  75. a speaker whose load varies too much for an OTL
  76. Mystery manufacturer/distributor
  77. 37s Anyone?
  78. sv811-10 push pull
  79. 416B dangerous tube?
  80. blew my amp because of distortion pedal
  81. Help with Tube Phono Output Impedance
  82. Minimum current for choke operation
  83. stored energy in output transformer?
  84. socket mounting depth
  85. Parafeeding a push pull
  86. Different direct heating styles?
  87. The most simple tube preamp
  88. Sample/hold DC servo circuit
  89. Interstage transformer as OPT?
  90. What can you do with cheap 1kV power?
  91. Marshall Super Lead MkII
  92. Flashing Rectifier Tube- Bad Thing?
  93. Amp for my speakers, PLEASE Help
  94. suitable preamp for a tube amp (kt88+12ax7)
  95. anyone know of a kit to make tube night light?
  96. Sprague capasitor id
  97. Question on Tango XE-20S
  98. 6SL7 diff pair - how to set up????
  99. Hwat should be the best driver for a 520V2 ?
  100. problem: half power on push-pull ?
  101. Screen voltage - standby cut (Roland Bolt 60)
  102. Triode Dick/FdeGrove 2A3 PP amplifier
  103. PSU for perusal
  104. Kt66 Gec Replica
  105. 6as7
  106. Please confirm my transformer math.
  107. Anything wrong with this design?
  108. Buffer Line Pre-Amp Power Tx
  109. Why filter in tube DAC?
  110. advances in tube amp design?
  111. How to determine grid leak current?
  112. dissimilar triode for White cathode follower?
  113. tube rectifier
  114. 6Vdc from 6,3Vac
  115. Computer Grade Cap or Inverter Grade Cap???
  116. Peculiar Sovtek EL34 bevaviour
  117. 5AS4 sub for 5U4
  118. Preamp hum again
  119. Modifying amp to accept different tubes (Newbie alert!)
  120. Quetion for Thorsten
  121. OPT axis
  122. Schematic Counterpoint SA3.1 and SA-9
  123. optimizing constant current heater supply
  124. Valve Art KT100
  125. baxandall tone control
  126. Kofi Annan in: "Brownin' Out!"
  127. strange tube
  128. Monarch SA-30 Schematic
  129. Power Supply for 300B Monoblock
  130. Matisse Line Amp
  131. Panel mounting on a woode case
  132. Hardware??
  133. another way to turn a pentode or tetrode into a triode
  134. 0Z4 as a rectifier?
  135. Unused HV windings on power transformer
  136. Mundorf M-Lytic and Silver-in-Oil Capacitors
  137. grainy preamp gain
  138. Need help with PS for 1626 "Darling" amp
  139. questions about power supply for 6l6 pp
  140. Proof that demagnetizing tubes works
  141. ECC88/5687/2A3 amp voltages
  142. What can I do with these? (tube and OPT question)
  143. Blowing fuses
  144. questions about transfo
  145. Common Cathode Resistor
  146. Why a Zobel network across OPT primary or secondary?
  147. Morgan Jones "Valve Amplifiers"
  148. Why?
  149. 833 push pull design help
  150. Lamm schematics
  151. Mu Followers -- ressources?
  152. Pennsylvania DIY's
  153. Interstage trans? Yes please!
  154. What's wrong with UL anyway ?
  155. SE amp like mcintosh ?
  156. 300b Push Pull Interstage Tsf
  157. amp stages...
  158. Heater supply recommendation for 6922?
  159. hi-end?
  160. Just a quicky
  161. Question on Mains Transformer
  162. Help! Who is the dirtributors of 6V4/EZ80 and 6H30/6N30?
  163. SE 6AS7 amp question
  164. Timed switch on B+ in power supply, good idea?
  165. Parts Sourcing
  166. Power Supply Question
  167. tube amp kits
  168. in search of a schematic
  169. heater wiring
  170. 5A/152M perfect driver? SPICE?
  171. 12AU7 -> 12BH7 Do I need to change Rp?
  172. Need help understanding transformer impedance ratios and impedance matching
  173. Audio schematics for GU50 ????
  174. 6sn7 & 6sn7GTB
  175. Tube amp schematic - any thoughts?
  176. tube distortion effect.
  177. tube rolling Blue Circle BC 21 preamp
  178. A sorry tale which will make you cry !!!
  179. Variac problems
  180. tubeamp project, weekend timekiller
  181. isolated supply grounding
  182. Car preamp with Aikido
  183. Audio Note M1 potentiometer question
  184. Beginner , tube kit suggestions please
  185. anyone ever used metalized polypropylene caps from Digi-key?
  186. Question on OPT
  187. Telefunken S80 Stereo ECL82 Amp- any comment?
  188. Active crossovers using Tubes
  189. 300BSE power amplifier circuit
  190. tube buffer using 12bz7
  191. "Complete" SE KT88
  192. Output Tube biasing for Toroidal Output Transformer
  193. Cardas Golden Capacitors
  194. Tube Buffer for CD-PRO2M (6922)
  195. Troubleshooting fuse blowing
  196. Billington valves and quallity
  197. Regulated PSU, your comments please.
  198. Change coupling cap from .47uf to 2.2uf
  199. RIAA Schematics?
  200. Line out for subwoofer in tube amps
  201. Feedback in IT coupled amps?
  202. Filemant Voltage
  203. DC compensated SE output transformer
  204. Winding an audio transformer
  205. Tube effects Loop Schematics... ?
  206. Scrap Heathkit W-5m for guitar amp?
  207. KT100...what's this ??
  208. Help measuring output impedience
  209. tubes
  210. Need PP KT-88 amp design and KT-88 for triode use?
  211. 7241 tube
  212. Max B+ for 807 UL?
  213. Fender amplifier.. burnt choke ??
  214. Problem with my Darling!
  215. Effect of cross-coupled "local" FB on plate load of previous stage
  216. wickedly awsome guitar amp
  217. DC coupled long tailed pairs
  218. I need an advice for these tubes..
  219. Anode Resistors on PPP Amps
  220. help with modifing a H/K A500 amp
  221. Damper Diode Musings
  222. Heater Question
  223. Push pull designs.
  224. Anybody heard about Tarzian Silicon Rectifier for Tube Rectifier Replacement?
  225. Voice of Music 555 phonograph
  226. Direct driving of GM70 by one ECL86 ???
  227. Bogen amp schematic
  228. 6336a
  229. Power transformer colors & wiring
  230. Stepped Attenuator and Selector Switch
  231. Music without speakers? Need help.
  232. el84 ultra linear datat sheet
  233. 2a3 layout
  234. Matisse Ref per amp
  235. Recommendations for Simple SET Amp Topologies
  236. HV power supply repair
  237. Grundig Model 3265U Restore?
  238. Valve Art EL 156!
  239. Classe A 6550 40W
  240. Lafayette Bypass Option
  241. Plate curves or Op Point for 6KN8?
  242. 12e1 sub for 807 ?
  243. Extremely low power and low loss transformers
  244. looking for power supply diagram SE 813 45 Watt
  245. How to make this 6C33C better??
  246. All octal 6AS7 PP amp is it possible?
  247. Toroids VS EI Transfomers
  248. Bias secrets for a HH Scott 233?!?
  249. new idea of DHT heater supply
  250. UL40-S2 schematic

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