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

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