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

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