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  1. DIY Tube Amp with phono
  2. active loading and point to point
  3. Which tubes are having biggest influence on sound (not power)?
  4. Output Transformers in series
  5. Trying to ID maker of O/P Transformers from 'Fuji-Star' tuner
  6. Dynaco Gear or Marketing?
  7. Help me ID these tubes
  8. BOC amp BP-40-k schematic
  9. Bias Schematic
  10. Filtering of DC volts?
  11. Motorola Stereophonic
  12. Helping a newbie break the code...
  13. Additional help.
  14. Help with tube ID.
  15. First build! Heater supply question
  16. Reasonable derating for a power transformer ?
  17. Information wanted on an old amp
  18. Quick question about heater voltage
  19. ECC83 Phase Splitter Voltages
  20. Bias Probe Question
  21. Vintage parts to new amp
  22. Converting all unbalanced connections to balanced
  23. ACF-2 Build
  24. Frequency dependent power rating; OPT se
  25. 6L6 SE AMP
  26. Need to know some kind of found tubes
  27. Sansui 1000a opt max current question
  28. 12U7 - any users out there?
  29. 6GW8 Tube Test Data Needed
  30. 832A headphone amplifier
  31. Help with el84 valves
  32. Tube Preamp philips Mullard
  33. ecc99 2a3
  34. Chinese amp Oscillation
  35. tube regulators
  36. Storing spare tubes
  37. Best way to re-apply text to vintage amp chassis?
  38. Technical questions: understanding "El Cheapo Grande"
  39. Another Approach to Totem Pole OTL Amplifier
  40. Dynaco ST-70 vs.... ????
  41. Tube rectifiers also need snubber capacitors?
  42. HV regulator design - opinions?
  43. 4E27 / 8001 transmitting tube
  44. testing WE 420A / 5755
  45. String LEDs on long tail pair?
  46. SMPS Tube kit - Interested?
  47. tung-sol 7236
  48. PT Failed Winding
  49. ID for an AMprex something...
  50. Help with floating AC heaters (please)
  51. parallel secondaries, both with center taps
  52. Eico ST 40
  53. Opt primary impedance for audionote M10 phono pre
  54. Sansui AU-70 hum in one channel
  55. Pye HF25 Monoblocks
  56. Magnavox 6V6 circuit and output transformers.
  57. 13.8 volt smps for a kt120 SE amp???
  58. EL84 custom monoblocks
  59. Little Bear pre amp valuable find...
  60. ECL8? Is this the proper name of this tube?
  61. EL 502 / EL 511
  62. Used too weak diode, fuse blew.
  63. My first ever vacuum tube amplifier :)
  64. ATS25N -- Any use for audio ??
  65. Maggie 9300 Amp Problem
  66. Musicmaster 6AQ5A socket
  67. 6922 or 12AX7
  68. nobsound amp
  69. New project: pre and power mono, what to build?
  70. Radford bias: options for ultralinear output
  71. Class D Amplifier -- building blocks
  72. HT windings with no CT
  73. Dynaco st 70 resistor
  74. Older Conrad Johnson or new something else
  75. Power supply dummy load
  76. Micro-power, micro cost amp with Rod-Tubes, 1P24B-V
  77. A bit of fun with archaic converters
  78. DOUK 5670+6AQ5+6E2 push-pull merge Class AB tube amp HIFI amplifier DIY KIT
  79. Counterpoint SA-5.1 with dead channel
  80. need safety advise - speaker output ternimals
  81. Marantz 8B Replica Build
  82. Why Gold Grids
  83. "Shiny Eyes" PSE 300B
  84. PCB layout for Valves
  85. rogers cadet mkiii
  86. Direct-Coupled Tube (or Tube-MOSFET) Headphone Amp Circuit
  87. My GM70 amp...separating the input+driver from the output stage
  88. My Quad II and 22 restoration
  89. Help with an OTL CV3618 amp design
  90. stancore NOS power transformer Picture
  91. Choosing a tube amplifier to build, HELP needed
  92. FB circuit for a Maggie 175 with Edcor UL OT's
  93. Gary Lays it on the Line (Classic Output XFMRs)
  94. Info needed on adding subwoofer to tune amp
  95. Help me understand this 7189A SE tube amp?
  96. uTracer Users: Could you trace Western Electric 436A, 448A tubes ?
  97. Tube amp project for 4 ohm speakers
  98. Wouldn't equal plate V + screen V = triode mode?
  99. 866A, 3B25 LTSPICE models
  100. 6HB6 as finals
  101. Leak OP Transformer Mod - Assistance please
  102. strange noise from tube line amp
  103. 6a6 tube as power output in headphone amp
  104. Mullard 6-7 stereo valve amp rebuild
  105. tube regulator for B+
  106. Yet another HV regulator
  107. Opinions on Clamping a ring-of-two bias-block in cathode of EL84
  108. Odd stabilized HV power EF86 + EL84
  109. NL710, 6011
  110. Somebody can identify this tube?
  111. Bullet proof driver circuit
  112. Need Grounding Advice for my System
  113. Use the chassis as the heatsink - Need safety advise
  114. Kofi's Tetra Sans
  115. Spice Simulation of NFB Amp with embedded PF
  116. Simplicity or complexity?
  117. 6N16B Aikido
  118. How to test a power supply
  119. Buying tubes in Bulgaria
  120. Input Trafo MFG reviews needed
  121. A cautinary tale.
  122. HELP! Hybrid Rectifier PSU with 2 Diodes und 2 TV-Dampers 6CG3
  123. ecc99-2a3:opinion
  124. Triode troubles
  125. Safe PSU capacitor values for old Dyna amp?
  126. KT88, 6550 SE Triode Strapped Performance.
  127. Dynaco A431 OPTs
  128. Gingertube's 'bias-block' EL84 Heatsunk MJE340?
  129. SST-70 w/KT-150's mono's build
  130. Error Correction?
  131. Tube amp issue
  132. 4x6N3 preamp board from ebay
  133. time delayed LED for heater
  134. Aikido PSU decisions
  135. coupling caps for RCA rebuild
  136. Recommended coax
  137. Adding solid state bass to valves
  138. Incompatibility between Aikido Pre and Tubelab SimpleSE
  139. What power amp design would suit Esoteric MG-20?
  140. PL36 (triode) SE
  141. Any thoughts on this?
  142. BAT VK 55 paralleled
  143. Looking for a good phono preamp schematic.
  144. Nice diy from Poland
  145. Unballancer humming in one channel
  146. 6S19P tubes instead of 7233 tubes.?
  147. Looking for good stereo amp <$350 - help
  148. Question on EL84 SE triode with CCS at cathode
  149. Convert choke loaded 12b4 to CCS and retain od3's
  150. What can I make with these?
  151. 12AT7 LTP Calling Eli Duttman
  152. Book Help, Please?
  153. Amplifier class A EL34
  154. ps audio hybrid tube buffer
  155. Negative Feedback Amplifier with embedded Positive Feedback Booster
  156. Looking for a single ended amp.
  157. EF39 as 300B driver...
  158. How is Electro Harmonix 6922 sonicly compared to NOS?
  159. Tube amp driving a Subwoofer
  160. Leak Stereo 20 Power Supply Choke?
  161. help me read circuit: broski 300b shunt reg
  162. CCS current regulators for OP valves
  163. 1930's push pull field coil amplifier
  164. Loudness and power and volts
  165. Opinions; big mess or have potential?
  166. Star grounding
  167. High NFB OTL headphone amp
  168. Any technical advantages of almost floating grounds?
  169. Output transformer
  170. 12AU7 Tube Line Pre-amp on Ebay
  171. Would you run these at say 1200vdc?
  172. MOSFET equivalent
  173. 6BY5 GA full wave rectifier replacement
  174. ID those parts - trafo
  175. Sweeps in class A
  176. Preamp valve rectified power supply
  177. Grommes Precision S-35 - Worth playing with?
  178. 6922 or E88CC in the Rode NTK Mic
  179. What the hell caused this?
  180. 6SN7 Aikido White Follower - Spice simulation
  181. Need to build a moving coil stage
  182. You guys and gals recognize any of this equipment?
  183. Help with first amp design, SET no feedback hp amp
  184. LTSPICE problems with 10Y model
  185. 5876 tube
  186. Claus Byrith 4-30: missing valve in the PCB?
  187. KR T1610 PP amp building
  188. Pls Help me Identify these Tubes!
  189. measuring output transformer primary impedance
  190. Unusual output transformer Triad
  191. Input transformer differences
  192. Faint buzz through power stage (845)
  193. Pros and Cons of 3rd Stage in SE (6AV5/2A3 drive requirements)
  194. Star grounding - wooden box
  195. R601P Tube Radio
  196. analog metric el34 se amp
  197. EL34 PP amplifier suggestions
  198. 6AU6 Triode Mode
  199. Another GM70
  200. newbie amp question.
  201. Push-Pull Plate Choke from Edcor?
  202. Finalizing 300B Amps==Please Comment
  203. Help!!!
  204. Controlling gain in VA stage
  205. 833 Push Pull Design
  206. restoring mullard valve paint
  207. Mentmore TVA1
  208. DIY in Korea?
  209. Case suggestions for Pye Black Box?
  210. help trouble shooting a problem
  211. Liteaudio 1s37 Phono preamp
  212. All DHT tube amp dream
  213. Suggestion for valve amp kit
  214. Why are directly heated rectifiers still popular?
  215. Headphone amp with pre out
  216. wish to buy 10's or other tungsten DHT's
  217. Audio Innovations Series 300 II -red plate
  218. 811 heater power supply...
  219. Bijou schematics question (PINs)
  220. Looking for a proficient tube tech in New England.
  221. hybrid amplifier using EF86
  222. Looking in San Diego....
  223. Ground of tube headphone amp
  224. Input Transformer Question
  225. Low imp tube headphone diy amp
  226. Cathode Follower as DAC Output Stage?
  227. Monoblock Gu-50 help.
  228. Aikido CF question
  229. Tube Power Amp Kit Recommendations
  230. EL34,KT66,6L6GC,KT77:who works better with high impedance OT load in SE Triode Mode?
  231. ECC40 Voltage Question
  232. Question re DC coupling vs RC coupling (AC)
  233. Measuring ripple in filament supply (coleman reg)
  234. What about use largest possible capacitor as interstage decoupling ( 1 or 2uf)
  235. replace 6N3 tube preamp with mullard E555L
  236. Preamp to Poweramp tube proximity/spacing?
  237. List of Tube Noise Measurements - please nominate lowest noise tubes
  238. Just for interest
  239. Time to build the big one.
  240. Opinion? Would the input/driver from a HK-5 be good to replace original Mk3 ft. end??
  241. Has anyone built this kit?
  242. mu-follower with output transformer?
  243. ECC81 double triode tubes flashed brightly when switched on.
  244. pre amp with tone controll
  245. Making own hifi tube amp from scratch!!
  246. Pentode CCS as a load for long tailed pair?
  247. E88CC & 6N23P plate voltage range?
  248. First pre phono design [newbie]
  249. Struggling with LTspice - How to use .inc to get a tube to appear
  250. Eico St 40

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