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  1. Convert choke loaded 12b4 to CCS and retain od3's
  2. What can I make with these?
  3. 12AT7 LTP Calling Eli Duttman
  4. Book Help, Please?
  5. Amplifier class A EL34
  6. ps audio hybrid tube buffer
  7. FS: Copper chassis, OPT and Power Xfmrs
  8. Negative Feedback Amplifier with embedded Positive Feedback Booster
  9. Looking for a single ended amp.
  10. EF39 as 300B driver...
  11. How is Electro Harmonix 6922 sonicly compared to NOS?
  12. Tube amp driving a Subwoofer
  13. Leak Stereo 20 Power Supply Choke?
  14. help me read circuit: broski 300b shunt reg
  15. CCS current regulators for OP valves
  16. 1930's push pull field coil amplifier
  17. Loudness and power and volts
  18. Opinions; big mess or have potential?
  19. Star grounding
  20. High NFB OTL headphone amp
  21. Any technical advantages of almost floating grounds?
  22. Twisted power cables
  23. Output transformer
  24. 12AU7 Tube Line Pre-amp on Ebay
  25. Would you run these at say 1200vdc?
  26. MOSFET equivalent
  27. 6BY5 GA full wave rectifier replacement
  28. ID those parts - trafo
  29. Sweeps in class A
  30. Preamp valve rectified power supply
  31. Grommes Precision S-35 - Worth playing with?
  32. 6922 or E88CC in the Rode NTK Mic
  33. What the hell caused this?
  34. 6SN7 Aikido White Follower - Spice simulation
  35. Need to build a moving coil stage
  36. You guys and gals recognize any of this equipment?
  37. Help with first amp design, SET no feedback hp amp
  38. LTSPICE problems with 10Y model
  39. 5876 tube
  40. P2P wiring and cable types
  41. Claus Byrith 4-30: missing valve in the PCB?
  42. KR T1610 PP amp building
  43. Pls Help me Identify these Tubes!
  44. measuring output transformer primary impedance
  45. Unusual output transformer Triad
  46. Input transformer differences
  47. Faint buzz through power stage (845)
  48. Pros and Cons of 3rd Stage in SE (6AV5/2A3 drive requirements)
  49. Star grounding - wooden box
  50. R601P Tube Radio
  51. analog metric el34 se amp
  52. EL34 PP amplifier suggestions
  53. 6AU6 Triode Mode
  54. Another GM70
  55. newbie amp question.
  56. Push-Pull Plate Choke from Edcor?
  57. Finalizing 300B Amps==Please Comment
  58. Help!!!
  59. Controlling gain in VA stage
  60. 833 Push Pull Design
  61. restoring mullard valve paint
  62. Mentmore TVA1
  63. DIY in Korea?
  64. Case suggestions for Pye Black Box?
  65. help trouble shooting a problem
  66. Liteaudio 1s37 Phono preamp
  67. All DHT tube amp dream
  68. Suggestion for valve amp kit
  69. Alps black beauty inductive?
  70. Why are directly heated rectifiers still popular?
  71. Headphone amp with pre out
  72. wish to buy 10's or other tungsten DHT's
  73. Audio Innovations Series 300 II -red plate
  74. 811 heater power supply...
  75. Bijou resistors specs
  76. Bijou schematics question (PINs)
  77. Looking for a proficient tube tech in New England.
  78. hybrid amplifier using EF86
  79. Looking in San Diego....
  80. Ground of tube headphone amp
  81. Input Transformer Question
  82. Low imp tube headphone diy amp
  83. Cathode Follower as DAC Output Stage?
  84. Monoblock Gu-50 help.
  85. Aikido CF question
  86. Tube Power Amp Kit Recommendations
  87. EL34,KT66,6L6GC,KT77:who works better with high impedance OT load in SE Triode Mode?
  88. ECC40 Voltage Question
  89. Question re DC coupling vs RC coupling (AC)
  90. Measuring ripple in filament supply (coleman reg)
  91. What about use largest possible capacitor as interstage decoupling ( 1 or 2uf)
  92. replace 6N3 tube preamp with mullard E555L
  93. Preamp to Poweramp tube proximity/spacing?
  94. List of Tube Noise Measurements - please nominate lowest noise tubes
  95. Just for interest
  96. Time to build the big one.
  97. Opinion? Would the input/driver from a HK-5 be good to replace original Mk3 ft. end??
  98. Has anyone built this kit?
  99. 22 AWG PTFE Wire jacket
  100. mu-follower with output transformer?
  101. ECC81 double triode tubes flashed brightly when switched on.
  102. pre amp with tone controll
  103. Making own hifi tube amp from scratch!!
  104. Pentode CCS as a load for long tailed pair?
  105. E88CC & 6N23P plate voltage range?
  106. First pre phono design [newbie]
  107. Struggling with LTspice - How to use .inc to get a tube to appear
  108. Eico St 40
  109. ECC88 Input/driverstage for F4 amp
  110. Tube headphone amp
  111. Rike Audio S-cap
  112. Acquired free brand new Jolida 302a
  113. Triode vs Transistor
  114. Help with restoration of Audio Research equipment
  115. Grommes 103gt tuner
  116. Frank’s 6SN7 pre & regulated supply
  117. Sleeping giant
  118. hum by mounting powertransformer and tubes on same chassis
  119. Rectifier tube overheating
  120. "World's Best Technical Master Craftsmen"
  121. OPT for 2A3
  122. getting rid of pre amp in a tube amp
  123. A question on OPT and no loads.
  124. Auto-Bias vs Manual bias vs EFB
  125. Russian receiving tubes and foreign equivalents
  126. B+ delay timer module
  127. Testing DIY triodes
  128. Adding a dummy load to prevent amp from being damaged by having no load?
  129. 30 watt class A chopper controlled bias with 6 EL84
  130. THD
  131. Input resistor (What are purposes?)
  132. Posted new 300B push-pull amp design
  133. Help me source a pair of OPT for Knight KG-240 tube amp
  134. Help Pick Transformers for EICO HF-87
  135. PreAmp
  136. Original price of the Conrad Johnson PV-5
  137. balance pots in Williamson driver stage
  138. Another Question on Tektronix Transformers
  139. Philco K1629 Upgrade Options
  140. My return to tubes, via headphones - what circuit would you recommend?
  141. High Quality EL84 UL SE Amplifier
  142. regulated supply to CCS plate load
  143. Twin Audio Sinfonia Preamp
  144. ecll800 schematic confusion
  145. 6L6 recommendations
  146. tube 100th
  147. Luxman OY15-5k OPT?
  148. Has anyone had experience with Russian 5C8S and 5C9S?
  149. New Here looking for info on rare SVIKO russian made 6KG6 monoblocks
  150. EL 84 pp amp - simple regulated circuit sought
  151. Any tube amp to drive B&W 802D?
  152. New to valve amplifiers
  153. SE 6GW8 output transformer with 5 wires.
  154. Mr.Curwen's single ended adventures
  155. Tube magic eye with em84-sensitivity?!
  156. Tube test
  157. Brimar 6V6 USSR
  158. Construction Guides
  159. World Design KT88 Kit
  160. Opinions appreciated: Lafayette LA 224b vs. McIntosh 225
  161. Clone X10D problems distortion / saturation ... help!
  162. 12DW7 or 12AU7+12AX7 if stereo?
  163. First preamp and gain control
  164. Tube life..
  165. Berman 76 preamplifier, I need some advice please
  166. How to light GM70 tube as decorative?
  167. Old Tube amp missing tubes. HELP
  168. Going to Berlin, looking for electronics diy shops
  169. 6SJ7 Vs 6Ж8 - Can the russian tube be considered an equivalent tube ?
  170. 6L6G Tung-Sol reissue: sweet sound and delicious night sight, but...
  171. Help with Eico ST70
  172. Class-D and Tube buffer/preamp off same 12V SLA?
  173. Hard time to find High Voltage medium power linear BJT
  174. Gu50 or 1624 PP amp first trials
  175. cathode follower driver A2
  176. High Pass Filter for OTL headphone Amp
  177. Bewitch 6550 Balance Issue
  178. ground hum issues in an old peak st-100
  179. Need an APPJ PA0901A Mini Amp Output Transformer.
  180. VTL Tiny Triode Schematics?
  181. A question of dynamics: Amplifier design?
  182. Rechargeable battery for cathode bias: open discussion
  183. High quality tube socket for 4P1L tube ?
  184. VTL Schematic needed
  185. Diode rating for filament voltage doubler
  186. SE vs PP for SET amps
  187. Use "mu output" from depletion mode MOSFET load?
  188. GM70 SE mov rectifiers
  189. First Preamp build
  190. Fisher KX-200 driving a pair of ESL from the plates
  191. Disadvantages of unbalanced tube
  192. The anatomy of a vacuum toob
  193. Valve Amplification Company CLA1 mkii help
  194. leak stereo 20 channel imbalance
  195. Mains powered 20W submin bridge amp
  196. SS rectification ST70
  197. K-12g ultra fast diode mod UF4007
  198. WE46c..
  199. 10 Pin B10A socket
  200. RIAA network adjustment
  201. audio research sp16
  202. Visiting Japan
  203. "up-rating" power filter chokes
  204. Differential pair gain/ where to apply feedback
  205. EL84 ECC83 SE Amp schematic
  206. high B+ voltage drop
  207. Volume control chip
  208. Signal Ground
  209. New to 6DJ8 tube
  210. EL91 Max ratings ? help
  211. I need a distraction!
  212. 300B amp project
  213. "bevois valley" in triode
  214. Strange problem wit a 3 tube preamplifier
  215. JJ Tesla vs. Electro Harmonix for Hi-Fi EL84 SE?
  216. This Tube CB make
  217. tubecad el84 powersupply ps4 question
  218. ART Tube MP studio V3 problems
  219. Calculating Cathode Bias w/o tube curves?
  220. Cathode follower PA Driver in a cathode biased amp
  221. I have my first Valve Amp, help me not blow it up!
  222. Unison Research SR-1 schematic/service manual
  223. Mega Tube DIY project
  224. very very simple single ended 300b valve amp schematic?
  225. 300b with single stage driver, c3m or?
  226. Cap upgrade for SVP RIAA stage
  227. Quick Q about JC's upside down front end.
  228. Bogen beasts again
  229. I thought this was a joke...but..
  230. Black pollution
  231. Difference between 6N1P and 6N23P?
  232. low voltage AC umbilical advice
  233. RCA MI-4288J Amplifier - Any info?
  234. 3.5k OPT for 45 type tube?
  235. DIY/OOTB upgrade? PP/SE?
  236. Sansui AU70
  237. Moody 496 Schematic Wanted
  238. Center-tapped Plate Choke vs. OPT for PP plate loads
  239. Help sourcing some resistors with very special values for a project
  240. Power Transformer Rating?
  241. KT120 x 4 / 240W Push Pull TUBE AMP MONOBLOCKS
  242. How Much Wiring??
  243. Schematic request for Meixing Mingda MC-211
  244. 300B SE with an interstage
  245. 211/845 tubes in a 805 based amp ?
  246. Grid leak bias, how does it work?
  247. Melos Sha Gold Reference
  248. Tube Amp for MTM
  249. Dynaco ST-70 Series III
  250. #27 + 6N8S Mu-Follower: Vhk Max Question

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