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  1. Another Approach to Totem Pole OTL Amplifier
  2. Dynaco ST-70 vs.... ????
  3. Tube rectifiers also need snubber capacitors?
  4. HV regulator design - opinions?
  5. 4E27 / 8001 transmitting tube
  6. testing WE 420A / 5755
  7. String LEDs on long tail pair?
  8. SMPS Tube kit - Interested?
  9. tung-sol 7236
  10. PT Failed Winding
  11. ID for an AMprex something...
  12. Help with floating AC heaters (please)
  13. parallel secondaries, both with center taps
  14. Eico ST 40
  15. Opt primary impedance for audionote M10 phono pre
  16. Sansui AU-70 hum in one channel
  17. Pye HF25 Monoblocks
  18. Magnavox 6V6 circuit and output transformers.
  19. 13.8 volt smps for a kt120 SE amp???
  20. EL84 custom monoblocks
  21. Little Bear pre amp valuable find...
  22. ECL8? Is this the proper name of this tube?
  23. EL 502 / EL 511
  24. Used too weak diode, fuse blew.
  25. My first ever vacuum tube amplifier :)
  26. ATS25N -- Any use for audio ??
  27. Maggie 9300 Amp Problem
  28. Musicmaster 6AQ5A socket
  29. 6922 or 12AX7
  30. nobsound amp
  31. New project: pre and power mono, what to build?
  32. Radford bias: options for ultralinear output
  33. Class D Amplifier -- building blocks
  34. HT windings with no CT
  35. Dynaco st 70 resistor
  36. Older Conrad Johnson or new something else
  37. Power supply dummy load
  38. Micro-power, micro cost amp with Rod-Tubes, 1P24B-V
  39. A bit of fun with archaic converters
  40. DOUK 5670+6AQ5+6E2 push-pull merge Class AB tube amp HIFI amplifier DIY KIT
  41. Counterpoint SA-5.1 with dead channel
  42. need safety advise - speaker output ternimals
  43. Marantz 8B Replica Build
  44. Why Gold Grids
  45. "Shiny Eyes" PSE 300B
  46. PCB layout for Valves
  47. rogers cadet mkiii
  48. Direct-Coupled Tube (or Tube-MOSFET) Headphone Amp Circuit
  49. My GM70 amp...separating the input+driver from the output stage
  50. My Quad II and 22 restoration
  51. Help with an OTL CV3618 amp design
  52. stancore NOS power transformer Picture
  53. Choosing a tube amplifier to build, HELP needed
  54. FB circuit for a Maggie 175 with Edcor UL OT's
  55. Gary Lays it on the Line (Classic Output XFMRs)
  56. Info needed on adding subwoofer to tune amp
  57. Help me understand this 7189A SE tube amp?
  58. uTracer Users: Could you trace Western Electric 436A, 448A tubes ?
  59. Tube amp project for 4 ohm speakers
  60. Wouldn't equal plate V + screen V = triode mode?
  61. 866A, 3B25 LTSPICE models
  62. 6HB6 as finals
  63. Leak OP Transformer Mod - Assistance please
  64. strange noise from tube line amp
  65. 6a6 tube as power output in headphone amp
  66. Mullard 6-7 stereo valve amp rebuild
  67. tube regulator for B+
  68. Yet another HV regulator
  69. Opinions on Clamping a ring-of-two bias-block in cathode of EL84
  70. Odd stabilized HV power EF86 + EL84
  71. NL710, 6011
  72. Somebody can identify this tube?
  73. Bullet proof driver circuit
  74. Need Grounding Advice for my System
  75. Use the chassis as the heatsink - Need safety advise
  76. Kofi's Tetra Sans
  77. Spice Simulation of NFB Amp with embedded PF
  78. Simplicity or complexity?
  79. 6N16B Aikido
  80. How to test a power supply
  81. Buying tubes in Bulgaria
  82. Input Trafo MFG reviews needed
  83. A cautinary tale.
  84. HELP! Hybrid Rectifier PSU with 2 Diodes und 2 TV-Dampers 6CG3
  85. ecc99-2a3:opinion
  86. AutoCAD tube/valve blocks
  87. Step By Step Journal Of My TubeLab SSE build
  88. Triode troubles
  89. Safe PSU capacitor values for old Dyna amp?
  90. KT88, 6550 SE Triode Strapped Performance.
  91. Dynaco A431 OPTs
  92. Gingertube's 'bias-block' EL84 Heatsunk MJE340?
  93. SST-70 w/KT-150's mono's build
  94. Error Correction?
  95. Tube amp issue
  96. 4x6N3 preamp board from ebay
  97. time delayed LED for heater
  98. Aikido PSU decisions
  99. coupling caps for RCA rebuild
  100. Recommended coax
  101. Adding solid state bass to valves
  102. Incompatibility between Aikido Pre and Tubelab SimpleSE
  103. What power amp design would suit Esoteric MG-20?
  104. PL36 (triode) SE
  105. Any thoughts on this?
  106. BAT VK 55 paralleled
  107. Looking for a good phono preamp schematic.
  108. Nice diy from Poland
  109. Unballancer humming in one channel
  110. 6S19P tubes instead of 7233 tubes.?
  111. Looking for good stereo amp <$350 - help
  112. Question on EL84 SE triode with CCS at cathode
  113. Convert choke loaded 12b4 to CCS and retain od3's
  114. What can I make with these?
  115. 12AT7 LTP Calling Eli Duttman
  116. Book Help, Please?
  117. Amplifier class A EL34
  118. ps audio hybrid tube buffer
  119. FS: Copper chassis, OPT and Power Xfmrs
  120. Negative Feedback Amplifier with embedded Positive Feedback Booster
  121. Looking for a single ended amp.
  122. EF39 as 300B driver...
  123. How is Electro Harmonix 6922 sonicly compared to NOS?
  124. Tube amp driving a Subwoofer
  125. Leak Stereo 20 Power Supply Choke?
  126. help me read circuit: broski 300b shunt reg
  127. CCS current regulators for OP valves
  128. 1930's push pull field coil amplifier
  129. Loudness and power and volts
  130. Opinions; big mess or have potential?
  131. Premier 90 Reverb Buzzzzz
  132. Star grounding
  133. High NFB OTL headphone amp
  134. Any technical advantages of almost floating grounds?
  135. Twisted power cables
  136. Output transformer
  137. 12AU7 Tube Line Pre-amp on Ebay
  138. Would you run these at say 1200vdc?
  139. MOSFET equivalent
  140. 6BY5 GA full wave rectifier replacement
  141. ID those parts - trafo
  142. Sweeps in class A
  143. Preamp valve rectified power supply
  144. Grommes Precision S-35 - Worth playing with?
  145. 6922 or E88CC in the Rode NTK Mic
  146. What the hell caused this?
  147. 6SN7 Aikido White Follower - Spice simulation
  148. Need to build a moving coil stage
  149. You guys and gals recognize any of this equipment?
  150. Help with first amp design, SET no feedback hp amp
  151. LTSPICE problems with 10Y model
  152. 5876 tube
  153. P2P wiring and cable types
  154. Claus Byrith 4-30: missing valve in the PCB?
  155. KR T1610 PP amp building
  156. Pls Help me Identify these Tubes!
  157. measuring output transformer primary impedance
  158. Unusual output transformer Triad
  159. Input transformer differences
  160. Faint buzz through power stage (845)
  161. Pros and Cons of 3rd Stage in SE (6AV5/2A3 drive requirements)
  162. Star grounding - wooden box
  163. R601P Tube Radio
  164. analog metric el34 se amp
  165. EL34 PP amplifier suggestions
  166. 6AU6 Triode Mode
  167. Another GM70
  168. newbie amp question.
  169. Push-Pull Plate Choke from Edcor?
  170. Finalizing 300B Amps==Please Comment
  171. Help!!!
  172. Controlling gain in VA stage
  173. 833 Push Pull Design
  174. restoring mullard valve paint
  175. Mentmore TVA1
  176. DIY in Korea?
  177. Case suggestions for Pye Black Box?
  178. help trouble shooting a problem
  179. Liteaudio 1s37 Phono preamp
  180. All DHT tube amp dream
  181. Suggestion for valve amp kit
  182. Alps black beauty inductive?
  183. Why are directly heated rectifiers still popular?
  184. Headphone amp with pre out
  185. wish to buy 10's or other tungsten DHT's
  186. Audio Innovations Series 300 II -red plate
  187. 811 heater power supply...
  188. Bijou resistors specs
  189. Bijou schematics question (PINs)
  190. Looking for a proficient tube tech in New England.
  191. hybrid amplifier using EF86
  192. Looking in San Diego....
  193. Ground of tube headphone amp
  194. Input Transformer Question
  195. Low imp tube headphone diy amp
  196. Cathode Follower as DAC Output Stage?
  197. Monoblock Gu-50 help.
  198. Aikido CF question
  199. Tube Power Amp Kit Recommendations
  200. EL34,KT66,6L6GC,KT77:who works better with high impedance OT load in SE Triode Mode?
  201. ECC40 Voltage Question
  202. Question re DC coupling vs RC coupling (AC)
  203. Measuring ripple in filament supply (coleman reg)
  204. What about use largest possible capacitor as interstage decoupling ( 1 or 2uf)
  205. replace 6N3 tube preamp with mullard E555L
  206. Preamp to Poweramp tube proximity/spacing?
  207. List of Tube Noise Measurements - please nominate lowest noise tubes
  208. Just for interest
  209. Time to build the big one.
  210. Opinion? Would the input/driver from a HK-5 be good to replace original Mk3 ft. end??
  211. Has anyone built this kit?
  212. 22 AWG PTFE Wire jacket
  213. mu-follower with output transformer?
  214. ECC81 double triode tubes flashed brightly when switched on.
  215. pre amp with tone controll
  216. Making own hifi tube amp from scratch!!
  217. Pentode CCS as a load for long tailed pair?
  218. E88CC & 6N23P plate voltage range?
  219. First pre phono design [newbie]
  220. Struggling with LTspice - How to use .inc to get a tube to appear
  221. Eico St 40
  222. ECC88 Input/driverstage for F4 amp
  223. Tube headphone amp
  224. Rike Audio S-cap
  225. Acquired free brand new Jolida 302a
  226. Triode vs Transistor
  227. Help with restoration of Audio Research equipment
  228. Grommes 103gt tuner
  229. Frank’s 6SN7 pre & regulated supply
  230. Sleeping giant
  231. hum by mounting powertransformer and tubes on same chassis
  232. Rectifier tube overheating
  233. "World's Best Technical Master Craftsmen"
  234. OPT for 2A3
  235. getting rid of pre amp in a tube amp
  236. A question on OPT and no loads.
  237. Auto-Bias vs Manual bias vs EFB
  238. Russian receiving tubes and foreign equivalents
  239. B+ delay timer module
  240. Testing DIY triodes
  241. Adding a dummy load to prevent amp from being damaged by having no load?
  242. 30 watt class A chopper controlled bias with 6 EL84
  243. THD
  244. Input resistor (What are purposes?)
  245. Posted new 300B push-pull amp design
  246. Help me source a pair of OPT for Knight KG-240 tube amp
  247. Help Pick Transformers for EICO HF-87
  248. PreAmp
  249. Original price of the Conrad Johnson PV-5
  250. balance pots in Williamson driver stage

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