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  1. Modeling Fi Primer 300B with LTSpice
  2. Please check my biasing numbers/methodology (EL34)
  3. yet another Antique Sounds 1006 845 SET
  4. Transformers, Marshall JTM45/100 Style 100W Output Transformer or Edcor CXPP100-4.2K
  5. Which VR Tube Option is Least Noisy
  6. Hybrid cascodes: does the tube actually matter?
  7. EL34 - 40W PCB
  8. Dynaco 6V6 Can replace 6SN7 with 6SL7?
  9. Separate power supplies for power and pre/driver tubes
  10. Coleman regulator on 2A3
  11. Amp
  12. Assembling the tube amplifier 6Ж4 - 6П3С.
  13. Advice needed for damper diode use
  14. 1614 vs 6L6
  15. 12ax7 el34 10watt diy 180-250v. why use a transformer?
  16. AR LS25MK2 actual schematic & simulation
  17. Measuring rp of triodes (and pentodes, for that matter)
  18. looking for input Kailin's Model K-6L6 OTL
  19. Possible to add a Pre out to a tube amp?
  20. Power Supply - 6SN7 KT88 PP Amp 50W
  21. Yaqin MC-100B heater elevation
  22. Douk Audio HiFi 6P3P kit
  23. hum
  24. Tung-Sol 6SN7GT / GTA / GTB datasheets + 6J5
  25. Dropping mains voltage
  26. Idea for a hybrid.
  27. Tube testing with regulated power supply...need help
  28. Lundahl LL1660S
  29. 6sn7/6 preamp tweaking advice
  30. Pics of your random experiments!
  31. PV5
  32. HV Secondary Testing
  33. Looking for 6SN7 tubes
  34. Shuguang WE211 or Psvane WE211?
  35. Tube Operational Amplifier
  36. Looking for entry level EL34 tube amp
  37. CATO linestage. Periodic DC offset problem.
  38. Hybrid amp
  39. H.H. Scott 265a
  40. Lundahl LL1668 25mA parallel capacitance
  41. 14GW8 4P1L PSE need tweak comment
  42. Questions about resistor for Sonic Frontiers SFL-1
  43. SPICE Phono MC with split RIAA. Is it O.K.?
  44. Help me to understand the maths for anode choke / IT
  45. choke input PS throws noise like crazy
  46. Altec 344a Quartet amplifiers, Amazing Junk...
  47. An unconventional integrated tube amp.
  48. DHT and Input/Driver on same heater supply?
  49. 2 LM317 CCS in series?
  50. Yaquin MS-12B preamp
  51. GZ34 JJ flashover
  52. I need some advice with this PCB!
  53. 6N2P-EV front end phase splitter and pre-amp stage
  54. low output
  55. I suppose it should be obvious but...
  56. 4p1l pentode driver
  57. Are these useful? utc s29 transformer
  58. Power Tube testing...
  59. Quad II w. New MEM Q: impedance+pre-amp
  60. 60W with CFB, using Sweep Tube, Full Differential
  61. DHT Cathode Follower?
  62. Quad II Hum / Ground Loop
  63. Need advice on a simple project
  64. Sy's Heretical preamp DC servo capacitor question...
  65. New Mullard 5-20 (4-30)
  66. 4P1L PP with no feed back help
  67. Preamp hengpen-13 with 6n3 advice!!
  68. 300B SE Driver Stage Understanding
  69. Spud and a half
  70. SEP- Amp power source
  71. Hammond 126B Frequency Response and More...
  72. Aikido & TVC
  73. Matching SS radio to tube amplifier input
  74. Valve buffer stage
  75. Transformers for Tube Crossover
  76. Contemporary 12AX7 Replacement
  77. How much GNF
  78. First build up and running
  79. Found these tubes cheap in a thrift store ....
  80. Tube buffer between CD and amp!
  81. Eico ST40 - Capacitor Questions
  82. Lowther Jazz 6L6 schematic
  83. DIY 2a3SE oscillation question!
  84. 2a3 vs 300b
  85. Using capacitor voltage divider
  86. Output impedence in spice
  87. Simple amp using PCL82, question
  88. 6SN7 push pull flea amplifier project
  89. 10m45s mu follower
  90. Better current drive approach?
  91. Single Ended stability with LT spice
  92. Secondary taps
  93. Can we talk about tube shunt regulators?
  94. 300b fixed bias supply
  95. Parallel Resistor/Tone Control Question
  96. MC Phono test generator
  97. Philips 5895 Direct-Heated Tetrode
  98. Zener diodes in a regulated bias supply
  99. Heater wiring - DC heaters
  100. Applied Feedback Theory (no pun intended)
  101. No output sound from 6v6 parallel push pull
  102. Test point help...
  103. Changing amp EL84
  104. 811a Push Pull need help
  105. Tube EQ - Tone control.
  106. ARC D115 mk2 DC balance adjustment
  107. Tubetvr's OTL Headphone amp
  108. MC-7P Hum
  109. Heathkit UA2 build up.
  110. Dumb/weird question
  111. EL34 amp design/build
  112. Tube IV stage
  113. Tube rectifier problem
  114. Is there a "best" hybrid rectifier scheme?...
  115. Audio Institute VR-110 schematic review
  116. 6ohm OPT
  117. Glass tail
  118. Simple SE on GU-50 and EF80
  119. Plate-to-plate negative feedback: pro and cons
  120. First Home Stereo Amp
  121. GZ37 Mullard or Fake?
  122. EL34PP at low plate voltageD
  123. Yaqin MS-300C
  124. Let's talk 12BH7
  125. Building an 6sn7GT Fleapower amp
  126. Removed load from active amp, kabooey!
  127. JADIS DA7 repair
  128. Vacuum tube parameters - Educate me
  129. Any interest in a home-etch pcb El Cheapo PP?
  130. Pre-Amp for Magnetic Cartridge
  131. Balanced DHT-Preamp/Dac-Output anyone ?
  132. O3s tube HP amp
  133. Wonder where tube technology originated?
  134. Miller effect on tubes with active load CCS
  135. Ju-Jutsu Monoblock Builds?
  136. Found this on ebay
  137. Moscode 300 resistors overheating
  138. Little Bear Pre-Amp Distortion - Need Advice
  139. Yaqin MC10L supply cap exploded.
  140. How can I add a balanced input to a tube amplifier?
  141. Leak Stereo 20 FB compensation.
  142. Tube line stage Preamp Outputs
  143. Output Transformer - C-Core or EI; M3 or M6 core?
  144. SE/10Y to PP/300B interstage suggestion
  145. Anyone out there with a KT150?
  146. heater sec voltage 6.3v
  147. Suggestions for a new SET or SEP build
  148. Williamson amplifier feedback problem
  149. Cathode bias with op amp?
  150. 6DE4 Flash
  151. Edcor line transformers for input isolation?
  152. Compare the valve?
  153. Beard P100S
  154. What to do with these Telewatts??
  155. Audio Research VS110
  156. To match or not to match
  157. mixed bias questions
  158. want to build all tube preamp
  159. Dual Rail Heater question
  160. Advantage of pentode for LTP?
  161. Tubes that will be around forever
  162. Simple Lineamp idea
  163. Hum & Distortion
  164. Type 83 Tube - Which Way To Plug In Socket?
  165. EL84 amp
  166. Source Follower with Rod Elliott Baffle Step Circuit?
  167. Help needed in Crosstalk calculation
  168. SE OPT Arcana
  169. Suggestions for Power Transformer KT88 PP
  170. A push-pull 6v6 amplifier design for your approval, not for the purists!
  171. Anyone around Omaha Ne area?
  172. Tube buffer for raising input impedance
  173. Hammond H-AO-43-1 (L100) chassis of any merit?
  174. DC offset
  175. Test Amplifier for Tube Circuits
  176. EC8010 phono stage anybody
  177. Extra power,higher DF,lower distortion from SE pentodes
  178. Looking for the best SQ Phono LCR schematic
  179. Completed 300B-C3M SET (pictures)
  180. 12av5ga variations!
  181. Replacing caps in signal path - 300B SET
  182. New 45/2A3 amp power supply question
  183. Power tubes won't bias properly
  184. Balanced active tone control
  185. Modifying a Schema - 832A
  186. Dynamic ST-500 el84 amp
  187. James Audio JS-6113HS vs 6113H
  188. Scott 299c restoration help
  189. Advice for Vu meter
  190. Dual supply for plate current, grounding?
  191. Is output tube cathode bypass mandatory in stereo amps?
  192. Choose tube for opt headphone amp
  193. Advice on improving this headphone amp design
  194. Small signal diode for 12AX7 bias
  195. HK A500 rebuild issues
  196. 50W monoblock "Engineers Amp"
  197. GU32 Push Pull amplifier Troubleshooting
  198. First tube amplifier build suggestions
  199. 55V DC at output of CAP in cathode follower
  200. Wiring a multi filament transformer?
  201. Direct driving a 300b
  202. Tampa Bay Area HELP!!!!!
  203. My 6E5P amps (SPUD)
  204. Is this a good phono preamp circuit to build?
  205. Parallel SE amp question
  206. Sharing Meter with Switch
  207. Elevating heaters in separate channels together
  208. 6DJ8 hybrid headphone amp
  209. cascode distortion Spectrum.
  210. voltmeter causes errata on scope when touching plate of V1
  211. Opto to bias triode?
  212. 6ж52п 6Z52P triode curves anyone?
  213. 815 tube in PSE
  214. Stromberg ASR-880 Biasing
  215. 6FM7 pp amp
  216. Power transformer general question
  217. Needs new 845 tubes for SET AMP
  218. Output voltage query
  219. 6BF6 Possibilities?
  220. using "wrong" primary PT
  221. Audio Innovations 500 output transformer
  222. Figuring out Heathkit T-4 OPT 51-31 turns ratio and repurpose
  223. Ask the dust ... an amp with the mighty 801A
  224. SE with low distorsion
  225. Zenith 7D31 / Magnavox 9300 amp - Thoughts and questions
  226. A300 6L6/6V6 modified Harmon Kardan A300 (XAM)
  227. Hi End Tube Amp Kit
  228. Cathode follower interstage power amp
  229. Roberts preamp & APH 1100
  230. Newbie looking for DIY Tube Pre-Amp Kit
  231. Switching of B+ and HT to lesser-used phono stage
  232. Picking operating voltage for a 5814/12AU7
  233. A well Engineered amplifier
  234. SRPP vs. transformer ratio
  235. Mosfet concertina - a better, more simple to design power amp?
  236. Current draw of different wiring/tap alternatives
  237. Which EL34/KT88 PP projects should I consider?
  238. Matching KT 88 Tubes?
  239. Hifiandaudio.com
  240. Pentode as inverted triode
  241. 300B in a EL34 PP amp via adaptor possible ?
  242. KT88 SE advice sought
  243. male42 RIAA Preamp Discussion
  244. Please advise a few decent EL34 P-P OPT.
  245. Tube swapping questions
  246. Integrated Tube Amp with tube Phono Pre-Amp
  247. EL34 PP Amplifier - would like some advice about two designs
  248. What preamp tube for a 2.5K/600 ohm OPT
  249. Question on building my first tube preamp power supply
  250. 6SN7 preamp advice

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