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  1. White cathode follower analysis and design
  2. SP14
  3. 6BQ5 triode driver stage operating point
  4. Did I draw this parafeed correctly???
  5. AutoBIAS (tentlabs) module
  6. PP 300b project (3 stage)
  7. Ideal THD vs Frequency for SET
  8. DigiBIAS incl. delay
  9. 6U8 input stage question
  10. PP amp E88CC - 6N8S - 6GB8
  11. Strange 45 behavior, Gas?
  12. PP UL amp: ECC83 + 6SN7 + KT88
  13. Simple trick to change UL from 40% to 60% ?!
  14. JJ 12AY7 for EL34 SE ?
  15. IT stage microphony
  16. first amplifier question
  17. 5687 tube 6.3VDC heater pins connection
  18. Preamp Power Supply - HV, filament & chassis earth - question
  19. Hybrid with a difference?
  20. Need Schematic for 6C5 Linestage
  21. KT88 PS Caps?
  22. Jolida 102B ALPS RK27 Install Tricks
  23. Yet another CCS
  24. Heater cathode potential
  25. Preamp HV and coupling cap question
  26. I am looking for the circuit from a tube amp (description and photo attached)
  27. Tube surround sound/hafler home theater build
  28. Looking at more preamps........
  29. Help me to improve my 6n6p/El34 UL...CCS/AnodeChoke/Transformer ?
  30. Darkvoice 336 tubes
  31. GU-50 opt in europe
  32. OPT on Ebay, any one know or use this?
  33. VTA M-125 mono block kit.
  34. 6V6 Regulator Issue
  35. Tube phono stage build
  36. First valve amplifier, tunings!
  37. Looking for 7N7 preamp schematic
  38. Line Magnetic LM-216 -- Annoying Hum
  39. Anthem Pre2L Special Edition...tubes?
  40. 6550 tube compatibles?
  41. Dynaco VTA ST-120.
  42. Tube amp help
  43. Transmitting tubes eg; 805 datasheet, Rp, gm, mu?
  44. 300b selectable ac or dc filament supply?
  45. Russian 6J43P-E(6Ж43ПE) Dual anode pentode....
  46. suitable 1:2 opt for a headphone amp
  47. Primary impedance, which tube?
  48. Dual-control, sharp-cutoff pentode
  49. Big transformer for little project?
  50. Entry in to DIY Tube world with 300B SET Kit
  51. Dynaco ST-70, Original or Mod?
  52. Damper diode as delay
  53. Thoughts on this design......
  54. Output Transformer Question
  55. Feedback on Andrea Ciuffoli's Extreme Hi-End Hybrid Amplifier
  56. Help troubleshooting oscillation
  57. Audio Research VS110
  58. Re-activate getter/save gassy tube
  59. What does 40% screen tap mean for UL OPT?
  60. Which pentode mode is this?
  61. ST-70 Power supply questions
  62. 3 stage DC - any thoughts?
  63. Help to choose the right EL34 schematic
  64. Russian tubes - Classification of various brands?
  65. hot bias- actually hot?
  66. POT between EAR834 phono and power amp
  67. Matching 100 tubes ECC803S
  68. EL34 Single-ended Class A tube amplifier KIT
  69. Help to de-bug a 6AH9/mosfet concertina driver
  70. More Ruminations on Screen Drive/Crazy Drive
  71. How is this possible??
  72. 10k power tube load
  73. Phonola Record Player TK 2146
  74. Anode Bootstrapping
  75. basic line stage testing
  76. Question about power transformer choice.
  77. Separating power supply with SET amps
  78. Weird EL84 and 6p14p-k tubes
  79. genuine 6P14P-EB?
  80. Power Transformer for OTL Headphone Amp
  81. Magnetic relay to drive with small-signal tube
  82. rj6 coaxial cable to wire the input connections to the input/driver tubes?
  83. Noob question: one channel is dead; safe to swap tubes to troubleshoot?
  84. Little 6BQ5 am squealing....HELP
  85. output trans for input trans
  86. Emulating Ultra Linear Mode
  87. Mullard 5-20 and logarithmic passive volume control: how to connect ?
  88. Chinese EL34B SE "A10" Disection
  89. indicator light using filament 6.3VAC voltage
  90. 6p42s tubes
  91. Type 79 Tube Question
  92. Preamp for 6N3 tube
  93. In praise of Tribute Autoformer Volume Control
  94. 12AE7 Automotive Tube Amplifier
  95. Using a LM317 for setting tube bias
  96. KT120 LED bias?
  97. Tubes with different mu in a cathode follower
  98. Scott LK-48 stock?
  99. Troubleshooting question
  100. Constant current load for testing power supplies
  101. Push Pull Parafeed Headphones Amp
  102. Grommes 20PG8 Amp Motorboating
  103. Anyother tube with same pinout than 6CG7?
  104. Calculating coupling capacitor values
  105. Help with Welborne DRD 45 amp
  106. GU-50 + solid state driver
  107. ECC82. JJ vs vintage, peculiar frequency response tests
  108. How to Bias Morrison Micro 2A3?
  109. Solid state feeding a tube amplifier
  110. Power Transformer for 845 Monoblock?
  111. 16LS Kit
  112. 12 pin compactron pinout dimensions ?
  113. Mullard 3-3 build oscillation?
  114. LTSpice newbie: why doesn't the EL34 sim properly?
  115. Op Amp booster circuits, tube hybrid
  116. 150K resistor at input. Too high value?
  117. Looking for a book about valve amps (MJ not suitable)
  118. Power Transformer for Decware ZBox
  119. mu-follower for hybrid amp
  120. Quick Question on Grid NFB
  121. Vintage SE output transformer has a G2 tap
  122. Views on a regulated bias supply
  123. Distortion in cathode follower output stage
  124. VT4-B
  125. series heater voltage for 5-channel preamp
  126. Tube Technology Unisis Information
  127. Newbie with k-16ls
  128. can i run parallel se 300b's off one supply winding
  129. volume fluctuation on tube amp
  130. The chassis, to ground or not to ground.....
  131. Substitute for RCA 841 driving 300B
  132. Music Angel
  133. Priboj with other tubes
  134. 211 Melody Platinum amplifier.
  135. Cloning my 1968 stereo.....power transformer question.
  136. DC Coupled EL34 Biasing - Help Request
  137. K-12G Tube amp Hum at low volume
  138. SE 6c33 Amplifier OPT overshoot/ringing oscillations
  139. Dynaco MKIII issue
  140. "SRPP" 300B Headphone Amplifier
  141. LDR's in the Marantz 10b
  142. Shuguang Treasure CV181-Z Lifespan in hours?
  143. Need to help to understand using 6x5 as half wave rect
  144. 300B plate voltages
  145. Mullard 3-3 power supply
  146. Best path into diy hifi tube audio
  147. 801A PP or 2a3 PP
  148. Shuguang Treasure tube genuine source?
  149. Passive RIAA with 6F12P and 6N5P
  150. ANDREA a Democratic hybrid amp for luxury sound
  151. Quad II classic output transformer
  152. overheating 10w resistor in power supply
  153. Strange EL34BW
  154. Scott LC21 tube hums when hand is near
  155. Heater Elevation & Dual Rail Power Supply
  156. Request for help with Wavebourn's SVCS
  157. Lundahl LL1682PP suitable for 300B PP amp?
  158. Modding input of EAR859 to feed output for Bi-Amp?
  159. Voltage gain triode
  160. Excellent midbass performance
  161. 6SN7 Mu Follower problem in distortion
  162. 6N7's in phase inverter service
  163. Going to Amberg Germany and Graz Austria, Any DIY-ers in the area have time to meet?
  164. Mullard 3-3, wrong power transformer
  165. Tube hybrid vfet
  166. 12ax7 + 12au7 strange behavior
  167. Hybrid amplifier with 6SN7 or 6SL7 tube
  168. Dynaco ST70 midrange glare
  169. Request review of my schematic
  170. 12AX7/12AU7 Williamson-style front end
  171. No-Vacuum Diamond Triode Device
  172. 6CB6 pentodes and 12AU7 twin triode to replace 7199 in major SCA35 rebuild
  173. miniwatt as headphone amp, impedance Q
  174. Fluorescing GU 29 tubes - whats wrong?
  175. SE 6CA7 Stereo Tube Amplifier Pot Hum
  176. Paragon 12A
  177. Need Help with PSU for KT120 / KT150 SE
  178. SE valve tube output transformer clarification.
  179. Poor valves or expecting too much ?
  180. ST-70 vs. Mark IV heater connections
  181. 6H8C Glass Moves
  182. Audio Research LS2BMkII parts identification
  183. Newbie Recapping, Help identifying caps
  184. Suppressor Grid tied to plate and not ground
  185. Picked up a heathkit aa - 32. ....now what.
  186. EL34 Internal shorts
  187. Questions about this EL34 amp design
  188. Troubleshooting 6550 Jadis Clone
  189. Help the newb: cathode to heater shortage
  190. Diy tube amp recommandation
  191. Bogen Presto Challenger AC220 Stereo Amplifier
  192. How to parafeed 811a from this schematic
  193. Help me to understand a simple bias question...
  194. Poinz Musical Machine - which class is it?
  195. A question on tube rolling
  196. Small tube stash - whats useful?
  197. Parallel triodes, single output question
  198. EL84 red plating
  199. ECC83 self-bias test circuit, weird mesurements
  200. AIKIDO
  201. vintage electronics kit
  202. Revox 40 tube amp 4 x ecl86
  203. DIY Preamp Issues
  204. 6n16b operating point
  205. Pete Millett's MAGIC BOX (6BN6 tube)
  206. Need confirmation if my schematic is good at all. It uses 50L6 as a stereo hi fi amp
  207. Chinese 6SN7 300B SE Amp - need help to tweak
  208. Kondo KSL-M77 heater regulator?
  209. Quad II issues
  210. THD measurements keithley 2015 integrated anp
  211. SRPP #56>D3A>EL 156 SE Build.
  212. webcore schematics???
  213. Purpose of LC Circuit going to Output Transformer?
  214. 12ax7+12au7 for DAC i/v
  215. Eico 666 settings for 5670
  216. transconductance conversion
  217. What is the pressure inside a mercury rectifier?
  218. Strange distortion value?
  219. Glass Ware and Pass
  220. Is over or undervolting bad for amps?
  221. Mod an EICO ST-70 or HF-20 into FISHER KX-200?
  222. Paralleled 12AX7's for phono stage
  223. Drive
  224. Telefunken Princess II 5486MX transformer question
  225. DAC in the Amp?
  226. Tube data for the 9AM10
  227. 5687 headphone amp
  228. Marantz Model 9 Prototype.
  229. Motorboating Tubes
  230. Mc Farlow f1mk2
  231. Global Matching of Great Tube WE300B, WE417A...etc
  232. What to do with unused half of triode ?
  233. Dynaco Mk III output transformers
  234. Gu-15
  235. Making a console stereo to a speaker amp?
  236. Strange valve pre amp on ebay.
  237. 833A "budget" design
  238. FU50 tube amp mods and schematic
  239. Tube type W1039 (subs NR27/A or CV1161) - Needs Datasheet, curves and/or info (any)
  240. Audio Research SP6B
  241. VTA PH16 Build
  242. What tubes to use with this Interstage Transformers?
  243. Questions and Problems with Mullard 5-10 clone
  244. semi scratch build; pas 3 board and pwr supply
  245. SHIII project, All-Pentode PP
  246. Battery bias and negative feedback
  247. schematic/kit recommendation for low gain output stage
  248. Help identifying OPT
  249. Getting Started On RCA Console I picked up
  250. Er, what's plate voltage?

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