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  1. CCS current regulators for OP valves
  2. 1930's push pull field coil amplifier
  3. Loudness and power and volts
  4. Opinions; big mess or have potential?
  5. Premier 90 Reverb Buzzzzz
  6. Star grounding
  7. High NFB OTL headphone amp
  8. Any technical advantages of almost floating grounds?
  9. Twisted power cables
  10. Output transformer
  11. 12AU7 Tube Line Pre-amp on Ebay
  12. Would you run these at say 1200vdc?
  13. MOSFET equivalent
  14. 6BY5 GA full wave rectifier replacement
  15. ID those parts - trafo
  16. Sweeps in class A
  17. Preamp valve rectified power supply
  18. Grommes Precision S-35 - Worth playing with?
  19. 6922 or E88CC in the Rode NTK Mic
  20. What the hell caused this?
  21. 6SN7 Aikido White Follower - Spice simulation
  22. Need to build a moving coil stage
  23. You guys and gals recognize any of this equipment?
  24. Help with first amp design, SET no feedback hp amp
  25. LTSPICE problems with 10Y model
  26. 5876 tube
  27. P2P wiring and cable types
  28. Claus Byrith 4-30: missing valve in the PCB?
  29. KR T1610 PP amp building
  30. Pls Help me Identify these Tubes!
  31. measuring output transformer primary impedance
  32. Unusual output transformer Triad
  33. Input transformer differences
  34. Faint buzz through power stage (845)
  35. Pros and Cons of 3rd Stage in SE (6AV5/2A3 drive requirements)
  36. Star grounding - wooden box
  37. R601P Tube Radio
  38. analog metric el34 se amp
  39. EL34 PP amplifier suggestions
  40. 6AU6 Triode Mode
  41. Another GM70
  42. newbie amp question.
  43. Push-Pull Plate Choke from Edcor?
  44. Finalizing 300B Amps==Please Comment
  45. Help!!!
  46. Controlling gain in VA stage
  47. 833 Push Pull Design
  48. restoring mullard valve paint
  49. Mentmore TVA1
  50. DIY in Korea?
  51. Case suggestions for Pye Black Box?
  52. help trouble shooting a problem
  53. Liteaudio 1s37 Phono preamp
  54. All DHT tube amp dream
  55. Suggestion for valve amp kit
  56. Alps black beauty inductive?
  57. Why are directly heated rectifiers still popular?
  58. Headphone amp with pre out
  59. wish to buy 10's or other tungsten DHT's
  60. Audio Innovations Series 300 II -red plate
  61. 811 heater power supply...
  62. Bijou resistors specs
  63. Bijou schematics question (PINs)
  64. Looking for a proficient tube tech in New England.
  65. hybrid amplifier using EF86
  66. Looking in San Diego....
  67. Ground of tube headphone amp
  68. Input Transformer Question
  69. Low imp tube headphone diy amp
  70. Cathode Follower as DAC Output Stage?
  71. Monoblock Gu-50 help.
  72. Aikido CF question
  73. Tube Power Amp Kit Recommendations
  74. EL34,KT66,6L6GC,KT77:who works better with high impedance OT load in SE Triode Mode?
  75. ECC40 Voltage Question
  76. Question re DC coupling vs RC coupling (AC)
  77. Measuring ripple in filament supply (coleman reg)
  78. What about use largest possible capacitor as interstage decoupling ( 1 or 2uf)
  79. replace 6N3 tube preamp with mullard E555L
  80. Preamp to Poweramp tube proximity/spacing?
  81. List of Tube Noise Measurements - please nominate lowest noise tubes
  82. Just for interest
  83. Time to build the big one.
  84. Opinion? Would the input/driver from a HK-5 be good to replace original Mk3 ft. end??
  85. Has anyone built this kit?
  86. 22 AWG PTFE Wire jacket
  87. mu-follower with output transformer?
  88. ECC81 double triode tubes flashed brightly when switched on.
  89. pre amp with tone controll
  90. Making own hifi tube amp from scratch!!
  91. Pentode CCS as a load for long tailed pair?
  92. E88CC & 6N23P plate voltage range?
  93. First pre phono design [newbie]
  94. Struggling with LTspice - How to use .inc to get a tube to appear
  95. Eico St 40
  96. ECC88 Input/driverstage for F4 amp
  97. Tube headphone amp
  98. Rike Audio S-cap
  99. Acquired free brand new Jolida 302a
  100. Triode vs Transistor
  101. Help with restoration of Audio Research equipment
  102. Grommes 103gt tuner
  103. Frank’s 6SN7 pre & regulated supply
  104. Sleeping giant
  105. hum by mounting powertransformer and tubes on same chassis
  106. Rectifier tube overheating
  107. "World's Best Technical Master Craftsmen"
  108. OPT for 2A3
  109. getting rid of pre amp in a tube amp
  110. A question on OPT and no loads.
  111. Auto-Bias vs Manual bias vs EFB
  112. Russian receiving tubes and foreign equivalents
  113. B+ delay timer module
  114. Testing DIY triodes
  115. Adding a dummy load to prevent amp from being damaged by having no load?
  116. 30 watt class A chopper controlled bias with 6 EL84
  117. THD
  118. Input resistor (What are purposes?)
  119. Posted new 300B push-pull amp design
  120. Help me source a pair of OPT for Knight KG-240 tube amp
  121. Help Pick Transformers for EICO HF-87
  122. PreAmp
  123. Original price of the Conrad Johnson PV-5
  124. balance pots in Williamson driver stage
  125. Another Question on Tektronix Transformers
  126. Philco K1629 Upgrade Options
  127. My return to tubes, via headphones - what circuit would you recommend?
  128. High Quality EL84 UL SE Amplifier
  129. regulated supply to CCS plate load
  130. Twin Audio Sinfonia Preamp
  131. ecll800 schematic confusion
  132. 6L6 recommendations
  133. tube 100th
  134. Luxman OY15-5k OPT?
  135. Has anyone had experience with Russian 5C8S and 5C9S?
  136. New Here looking for info on rare SVIKO russian made 6KG6 monoblocks
  137. DC-DC converters
  138. EL 84 pp amp - simple regulated circuit sought
  139. Any tube amp to drive B&W 802D?
  140. New to valve amplifiers
  141. SE 6GW8 output transformer with 5 wires.
  142. Mr.Curwen's single ended adventures
  143. Tube magic eye with em84-sensitivity?!
  144. Tube test
  145. Brimar 6V6 USSR
  146. Construction Guides
  147. World Design KT88 Kit
  148. Opinions appreciated: Lafayette LA 224b vs. McIntosh 225
  149. Clone X10D problems distortion / saturation ... help!
  150. 12DW7 or 12AU7+12AX7 if stereo?
  151. First preamp and gain control
  152. Tube life..
  153. Berman 76 preamplifier, I need some advice please
  154. How to light GM70 tube as decorative?
  155. Old Tube amp missing tubes. HELP
  156. Going to Berlin, looking for electronics diy shops
  157. 6SJ7 Vs 6Ж8 - Can the russian tube be considered an equivalent tube ?
  158. 6L6G Tung-Sol reissue: sweet sound and delicious night sight, but...
  159. Help with Eico ST70
  160. Class-D and Tube buffer/preamp off same 12V SLA?
  161. Hard time to find High Voltage medium power linear BJT
  162. Gu50 or 1624 PP amp first trials
  163. cathode follower driver A2
  164. High Pass Filter for OTL headphone Amp
  165. Bewitch 6550 Balance Issue
  166. ground hum issues in an old peak st-100
  167. Need an APPJ PA0901A Mini Amp Output Transformer.
  168. VTL Tiny Triode Schematics?
  169. A question of dynamics: Amplifier design?
  170. Rechargeable battery for cathode bias: open discussion
  171. High quality tube socket for 4P1L tube ?
  172. VTL Schematic needed
  173. Diode rating for filament voltage doubler
  174. SE vs PP for SET amps
  175. Use "mu output" from depletion mode MOSFET load?
  176. GM70 SE mov rectifiers
  177. First Preamp build
  178. Fisher KX-200 driving a pair of ESL from the plates
  179. Disadvantages of unbalanced tube
  180. The anatomy of a vacuum toob
  181. Valve Amplification Company CLA1 mkii help
  182. leak stereo 20 channel imbalance
  183. Mains powered 20W submin bridge amp
  184. SS rectification ST70
  185. K-12g ultra fast diode mod UF4007
  186. WE46c..
  187. 10 Pin B10A socket
  188. RIAA network adjustment
  189. audio research sp16
  190. Visiting Japan
  191. "up-rating" power filter chokes
  192. Differential pair gain/ where to apply feedback
  193. EL84 ECC83 SE Amp schematic
  194. high B+ voltage drop
  195. Volume control chip
  196. Signal Ground
  197. New to 6DJ8 tube
  198. EL91 Max ratings ? help
  199. I need a distraction!
  200. 300B amp project
  201. "bevois valley" in triode
  202. Strange problem wit a 3 tube preamplifier
  203. JJ Tesla vs. Electro Harmonix for Hi-Fi EL84 SE?
  204. This Tube CB make
  205. tubecad el84 powersupply ps4 question
  206. ART Tube MP studio V3 problems
  207. Calculating Cathode Bias w/o tube curves?
  208. Cathode follower PA Driver in a cathode biased amp
  209. I have my first Valve Amp, help me not blow it up!
  210. Unison Research SR-1 schematic/service manual
  211. Mega Tube DIY project
  212. very very simple single ended 300b valve amp schematic?
  213. 300b with single stage driver, c3m or?
  214. Cap upgrade for SVP RIAA stage
  215. Quick Q about JC's upside down front end.
  216. Bogen beasts again
  217. I thought this was a joke...but..
  218. Black pollution
  219. Difference between 6N1P and 6N23P?
  220. low voltage AC umbilical advice
  221. RCA MI-4288J Amplifier - Any info?
  222. 3.5k OPT for 45 type tube?
  223. DIY/OOTB upgrade? PP/SE?
  224. Sansui AU70
  225. Moody 496 Schematic Wanted
  226. Center-tapped Plate Choke vs. OPT for PP plate loads
  227. Help sourcing some resistors with very special values for a project
  228. Power Transformer Rating?
  229. KT120 x 4 / 240W Push Pull TUBE AMP MONOBLOCKS
  230. How Much Wiring??
  231. Schematic request for Meixing Mingda MC-211
  232. 300B SE with an interstage
  233. 211/845 tubes in a 805 based amp ?
  234. Grid leak bias, how does it work?
  235. Melos Sha Gold Reference
  236. Tube Amp for MTM
  237. Dynaco ST-70 Series III
  238. #27 + 6N8S Mu-Follower: Vhk Max Question
  239. Tube Mic preamp with compressor - any ideas?
  240. Counterpoint Sa-5000 and Klimo Kent - needed service manuals
  241. Drawing loadline using interstage / choosing interstage
  242. My New Iron for Single Ended 2a3
  243. GU-50 push pull amplifier
  244. 12SL7GT vs 12SN7GT
  245. DIY power amp and speakers
  246. KT88 SE
  247. Building a 6bq5 set amp
  248. OPT DC question
  249. Suitable speakers for a Leak Stereo 20
  250. Need advice on tube record player power jack.

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