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  1. Recommended coax
  2. Adding solid state bass to valves
  3. Incompatibility between Aikido Pre and Tubelab SimpleSE
  4. What power amp design would suit Esoteric MG-20?
  5. PL36 (triode) SE
  6. Any thoughts on this?
  7. BAT VK 55 paralleled
  8. Looking for a good phono preamp schematic.
  9. Nice diy from Poland
  10. Unballancer humming in one channel
  11. 6S19P tubes instead of 7233 tubes.?
  12. Looking for good stereo amp <$350 - help
  13. Question on EL84 SE triode with CCS at cathode
  14. Convert choke loaded 12b4 to CCS and retain od3's
  15. What can I make with these?
  16. 12AT7 LTP Calling Eli Duttman
  17. Book Help, Please?
  18. Amplifier class A EL34
  19. ps audio hybrid tube buffer
  20. Negative Feedback Amplifier with embedded Positive Feedback Booster
  21. Looking for a single ended amp.
  22. EF39 as 300B driver...
  23. How is Electro Harmonix 6922 sonicly compared to NOS?
  24. Tube amp driving a Subwoofer
  25. Leak Stereo 20 Power Supply Choke?
  26. help me read circuit: broski 300b shunt reg
  27. CCS current regulators for OP valves
  28. 1930's push pull field coil amplifier
  29. Loudness and power and volts
  30. Opinions; big mess or have potential?
  31. Star grounding
  32. High NFB OTL headphone amp
  33. Any technical advantages of almost floating grounds?
  34. Output transformer
  35. 12AU7 Tube Line Pre-amp on Ebay
  36. Would you run these at say 1200vdc?
  37. MOSFET equivalent
  38. 6BY5 GA full wave rectifier replacement
  39. ID those parts - trafo
  40. Sweeps in class A
  41. Preamp valve rectified power supply
  42. Grommes Precision S-35 - Worth playing with?
  43. 6922 or E88CC in the Rode NTK Mic
  44. What the hell caused this?
  45. 6SN7 Aikido White Follower - Spice simulation
  46. Need to build a moving coil stage
  47. You guys and gals recognize any of this equipment?
  48. Help with first amp design, SET no feedback hp amp
  49. LTSPICE problems with 10Y model
  50. 5876 tube
  51. P2P wiring and cable types
  52. Claus Byrith 4-30: missing valve in the PCB?
  53. KR T1610 PP amp building
  54. Pls Help me Identify these Tubes!
  55. measuring output transformer primary impedance
  56. Unusual output transformer Triad
  57. Input transformer differences
  58. Faint buzz through power stage (845)
  59. Pros and Cons of 3rd Stage in SE (6AV5/2A3 drive requirements)
  60. Star grounding - wooden box
  61. R601P Tube Radio
  62. analog metric el34 se amp
  63. EL34 PP amplifier suggestions
  64. 6AU6 Triode Mode
  65. Another GM70
  66. newbie amp question.
  67. Push-Pull Plate Choke from Edcor?
  68. Finalizing 300B Amps==Please Comment
  69. Help!!!
  70. Controlling gain in VA stage
  71. 833 Push Pull Design
  72. restoring mullard valve paint
  73. Mentmore TVA1
  74. DIY in Korea?
  75. Case suggestions for Pye Black Box?
  76. help trouble shooting a problem
  77. Liteaudio 1s37 Phono preamp
  78. All DHT tube amp dream
  79. Suggestion for valve amp kit
  80. Why are directly heated rectifiers still popular?
  81. Headphone amp with pre out
  82. wish to buy 10's or other tungsten DHT's
  83. Audio Innovations Series 300 II -red plate
  84. 811 heater power supply...
  85. Bijou schematics question (PINs)
  86. Looking for a proficient tube tech in New England.
  87. hybrid amplifier using EF86
  88. Looking in San Diego....
  89. Ground of tube headphone amp
  90. Input Transformer Question
  91. Low imp tube headphone diy amp
  92. Cathode Follower as DAC Output Stage?
  93. Monoblock Gu-50 help.
  94. Aikido CF question
  95. Tube Power Amp Kit Recommendations
  96. EL34,KT66,6L6GC,KT77:who works better with high impedance OT load in SE Triode Mode?
  97. ECC40 Voltage Question
  98. Question re DC coupling vs RC coupling (AC)
  99. Measuring ripple in filament supply (coleman reg)
  100. What about use largest possible capacitor as interstage decoupling ( 1 or 2uf)
  101. replace 6N3 tube preamp with mullard E555L
  102. Preamp to Poweramp tube proximity/spacing?
  103. List of Tube Noise Measurements - please nominate lowest noise tubes
  104. Just for interest
  105. Time to build the big one.
  106. Opinion? Would the input/driver from a HK-5 be good to replace original Mk3 ft. end??
  107. Has anyone built this kit?
  108. mu-follower with output transformer?
  109. ECC81 double triode tubes flashed brightly when switched on.
  110. pre amp with tone controll
  111. Making own hifi tube amp from scratch!!
  112. Pentode CCS as a load for long tailed pair?
  113. E88CC & 6N23P plate voltage range?
  114. First pre phono design [newbie]
  115. Struggling with LTspice - How to use .inc to get a tube to appear
  116. Eico St 40
  117. ECC88 Input/driverstage for F4 amp
  118. Tube headphone amp
  119. Acquired free brand new Jolida 302a
  120. Help with restoration of Audio Research equipment
  121. Grommes 103gt tuner
  122. Frank’s 6SN7 pre & regulated supply
  123. Sleeping giant
  124. hum by mounting powertransformer and tubes on same chassis
  125. Rectifier tube overheating
  126. "World's Best Technical Master Craftsmen"
  127. OPT for 2A3
  128. getting rid of pre amp in a tube amp
  129. A question on OPT and no loads.
  130. Auto-Bias vs Manual bias vs EFB
  131. Russian receiving tubes and foreign equivalents
  132. B+ delay timer module
  133. Testing DIY triodes
  134. Adding a dummy load to prevent amp from being damaged by having no load?
  135. 30 watt class A chopper controlled bias with 6 EL84
  136. Input resistor (What are purposes?)
  137. Posted new 300B push-pull amp design
  138. Help me source a pair of OPT for Knight KG-240 tube amp
  139. Help Pick Transformers for EICO HF-87
  140. PreAmp
  141. Original price of the Conrad Johnson PV-5
  142. balance pots in Williamson driver stage
  143. Another Question on Tektronix Transformers
  144. Philco K1629 Upgrade Options
  145. My return to tubes, via headphones - what circuit would you recommend?
  146. High Quality EL84 UL SE Amplifier
  147. regulated supply to CCS plate load
  148. Twin Audio Sinfonia Preamp
  149. ecll800 schematic confusion
  150. 6L6 recommendations
  151. tube 100th
  152. Luxman OY15-5k OPT?
  153. Has anyone had experience with Russian 5C8S and 5C9S?
  154. New Here looking for info on rare SVIKO russian made 6KG6 monoblocks
  155. EL 84 pp amp - simple regulated circuit sought
  156. Any tube amp to drive B&W 802D?
  157. New to valve amplifiers
  158. SE 6GW8 output transformer with 5 wires.
  159. Mr.Curwen's single ended adventures
  160. Tube magic eye with em84-sensitivity?!
  161. Tube test
  162. Brimar 6V6 USSR
  163. World Design KT88 Kit
  164. Opinions appreciated: Lafayette LA 224b vs. McIntosh 225
  165. Clone X10D problems distortion / saturation ... help!
  166. 12DW7 or 12AU7+12AX7 if stereo?
  167. First preamp and gain control
  168. Tube life..
  169. Berman 76 preamplifier, I need some advice please
  170. Old Tube amp missing tubes. HELP
  171. Going to Berlin, looking for electronics diy shops
  172. 6SJ7 Vs 6Ж8 - Can the russian tube be considered an equivalent tube ?
  173. 6L6G Tung-Sol reissue: sweet sound and delicious night sight, but...
  174. Help with Eico ST70
  175. Class-D and Tube buffer/preamp off same 12V SLA?
  176. Gu50 or 1624 PP amp first trials
  177. cathode follower driver A2
  178. High Pass Filter for OTL headphone Amp
  179. Bewitch 6550 Balance Issue
  180. ground hum issues in an old peak st-100
  181. Need an APPJ PA0901A Mini Amp Output Transformer.
  182. VTL Tiny Triode Schematics?
  183. A question of dynamics: Amplifier design?
  184. Rechargeable battery for cathode bias: open discussion
  185. High quality tube socket for 4P1L tube ?
  186. VTL Schematic needed
  187. Diode rating for filament voltage doubler
  188. SE vs PP for SET amps
  189. Use "mu output" from depletion mode MOSFET load?
  190. GM70 SE mov rectifiers
  191. First Preamp build
  192. Fisher KX-200 driving a pair of ESL from the plates
  193. Disadvantages of unbalanced tube
  194. The anatomy of a vacuum toob
  195. Valve Amplification Company CLA1 mkii help
  196. leak stereo 20 channel imbalance
  197. Mains powered 20W submin bridge amp
  198. SS rectification ST70
  199. K-12g ultra fast diode mod UF4007
  200. WE46c..
  201. 10 Pin B10A socket
  202. RIAA network adjustment
  203. audio research sp16
  204. Visiting Japan
  205. "up-rating" power filter chokes
  206. Differential pair gain/ where to apply feedback
  207. EL84 ECC83 SE Amp schematic
  208. high B+ voltage drop
  209. Volume control chip
  210. Signal Ground
  211. New to 6DJ8 tube
  212. EL91 Max ratings ? help
  213. I need a distraction!
  214. 300B amp project
  215. "bevois valley" in triode
  216. Strange problem wit a 3 tube preamplifier
  217. JJ Tesla vs. Electro Harmonix for Hi-Fi EL84 SE?
  218. This Tube CB make
  219. tubecad el84 powersupply ps4 question
  220. ART Tube MP studio V3 problems
  221. Calculating Cathode Bias w/o tube curves?
  222. Cathode follower PA Driver in a cathode biased amp
  223. I have my first Valve Amp, help me not blow it up!
  224. Unison Research SR-1 schematic/service manual
  225. Mega Tube DIY project
  226. very very simple single ended 300b valve amp schematic?
  227. 300b with single stage driver, c3m or?
  228. Cap upgrade for SVP RIAA stage
  229. Quick Q about JC's upside down front end.
  230. Bogen beasts again
  231. I thought this was a joke...but..
  232. Black pollution
  233. Difference between 6N1P and 6N23P?
  234. low voltage AC umbilical advice
  235. RCA MI-4288J Amplifier - Any info?
  236. 3.5k OPT for 45 type tube?
  237. DIY/OOTB upgrade? PP/SE?
  238. Sansui AU70
  239. Moody 496 Schematic Wanted
  240. Center-tapped Plate Choke vs. OPT for PP plate loads
  241. Help sourcing some resistors with very special values for a project
  242. Power Transformer Rating?
  243. KT120 x 4 / 240W Push Pull TUBE AMP MONOBLOCKS
  244. How Much Wiring??
  245. Schematic request for Meixing Mingda MC-211
  246. 300B SE with an interstage
  247. 211/845 tubes in a 805 based amp ?
  248. Grid leak bias, how does it work?
  249. Melos Sha Gold Reference
  250. Tube Amp for MTM

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