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  1. low output
  2. I suppose it should be obvious but...
  3. 4p1l pentode driver
  4. Are these useful? utc s29 transformer
  5. Power Tube testing...
  6. Quad II w. New MEM Q: impedance+pre-amp
  7. 60W with CFB, using Sweep Tube, Full Differential
  8. DHT Cathode Follower?
  9. Quad II Hum / Ground Loop
  10. Need advice on a simple project
  11. Sy's Heretical preamp DC servo capacitor question...
  12. New Mullard 5-20 (4-30)
  13. 4P1L PP with no feed back help
  14. Preamp hengpen-13 with 6n3 advice!!
  15. 300B SE Driver Stage Understanding
  16. Spud and a half
  17. SEP- Amp power source
  18. Hammond 126B Frequency Response and More...
  19. Aikido & TVC
  20. Matching SS radio to tube amplifier input
  21. Valve buffer stage
  22. Transformers for Tube Crossover
  23. Contemporary 12AX7 Replacement
  24. How much GNF
  25. First build up and running
  26. Found these tubes cheap in a thrift store ....
  27. Tube buffer between CD and amp!
  28. Eico ST40 - Capacitor Questions
  29. Lowther Jazz 6L6 schematic
  30. DIY 2a3SE oscillation question!
  31. 2a3 vs 300b
  32. Using capacitor voltage divider
  33. Output impedence in spice
  34. Simple amp using PCL82, question
  35. 6SN7 push pull flea amplifier project
  36. 10m45s mu follower
  37. Better current drive approach?
  38. Single Ended stability with LT spice
  39. Secondary taps
  40. Can we talk about tube shunt regulators?
  41. 300b fixed bias supply
  42. Parallel Resistor/Tone Control Question
  43. MC Phono test generator
  44. Philips 5895 Direct-Heated Tetrode
  45. Zener diodes in a regulated bias supply
  46. Heater wiring - DC heaters
  47. Applied Feedback Theory (no pun intended)
  48. No output sound from 6v6 parallel push pull
  49. Test point help...
  50. Changing amp EL84
  51. 811a Push Pull need help
  52. Tube EQ - Tone control.
  53. ARC D115 mk2 DC balance adjustment
  54. Tubetvr's OTL Headphone amp
  55. MC-7P Hum
  56. Heathkit UA2 build up.
  57. Dumb/weird question
  58. EL34 amp design/build
  59. Tube IV stage
  60. Tube rectifier problem
  61. Is there a "best" hybrid rectifier scheme?...
  62. Audio Institute VR-110 schematic review
  63. 6ohm OPT
  64. Glass tail
  65. Simple SE on GU-50 and EF80
  66. Plate-to-plate negative feedback: pro and cons
  67. First Home Stereo Amp
  68. GZ37 Mullard or Fake?
  69. EL34PP at low plate voltageD
  70. Yaqin MS-300C
  71. Let's talk 12BH7
  72. Building an 6sn7GT Fleapower amp
  73. Removed load from active amp, kabooey!
  74. JADIS DA7 repair
  75. Vacuum tube parameters - Educate me
  76. Any interest in a home-etch pcb El Cheapo PP?
  77. Pre-Amp for Magnetic Cartridge
  78. Balanced DHT-Preamp/Dac-Output anyone ?
  79. O3s tube HP amp
  80. Wonder where tube technology originated?
  81. Miller effect on tubes with active load CCS
  82. Ju-Jutsu Monoblock Builds?
  83. Found this on ebay
  84. Moscode 300 resistors overheating
  85. Little Bear Pre-Amp Distortion - Need Advice
  86. Yaqin MC10L supply cap exploded.
  87. How can I add a balanced input to a tube amplifier?
  88. Leak Stereo 20 FB compensation.
  89. Tube line stage Preamp Outputs
  90. Output Transformer - C-Core or EI; M3 or M6 core?
  91. SE/10Y to PP/300B interstage suggestion
  92. Anyone out there with a KT150?
  93. heater sec voltage 6.3v
  94. Suggestions for a new SET or SEP build
  95. Williamson amplifier feedback problem
  96. Cathode bias with op amp?
  97. 6DE4 Flash
  98. Edcor line transformers for input isolation?
  99. Compare the valve?
  100. Beard P100S
  101. What to do with these Telewatts??
  102. Audio Research VS110
  103. To match or not to match
  104. mixed bias questions
  105. want to build all tube preamp
  106. Dual Rail Heater question
  107. Advantage of pentode for LTP?
  108. Tubes that will be around forever
  109. Simple Lineamp idea
  110. Hum & Distortion
  111. Type 83 Tube - Which Way To Plug In Socket?
  112. EL84 amp
  113. Source Follower with Rod Elliott Baffle Step Circuit?
  114. Help needed in Crosstalk calculation
  115. SE OPT Arcana
  116. Suggestions for Power Transformer KT88 PP
  117. A push-pull 6v6 amplifier design for your approval, not for the purists!
  118. Anyone around Omaha Ne area?
  119. Tube buffer for raising input impedance
  120. Hammond H-AO-43-1 (L100) chassis of any merit?
  121. DC offset
  122. Test Amplifier for Tube Circuits
  123. EC8010 phono stage anybody
  124. Extra power,higher DF,lower distortion from SE pentodes
  125. Looking for the best SQ Phono LCR schematic
  126. Completed 300B-C3M SET (pictures)
  127. 12av5ga variations!
  128. Replacing caps in signal path - 300B SET
  129. New 45/2A3 amp power supply question
  130. Power tubes won't bias properly
  131. Balanced active tone control
  132. Modifying a Schema - 832A
  133. Dynamic ST-500 el84 amp
  134. James Audio JS-6113HS vs 6113H
  135. Scott 299c restoration help
  136. Advice for Vu meter
  137. Dual supply for plate current, grounding?
  138. Is output tube cathode bypass mandatory in stereo amps?
  139. Choose tube for opt headphone amp
  140. Advice on improving this headphone amp design
  141. Small signal diode for 12AX7 bias
  142. HK A500 rebuild issues
  143. 50W monoblock "Engineers Amp"
  144. GU32 Push Pull amplifier Troubleshooting
  145. First tube amplifier build suggestions
  146. 55V DC at output of CAP in cathode follower
  147. Wiring a multi filament transformer?
  148. Direct driving a 300b
  149. Tampa Bay Area HELP!!!!!
  150. My 6E5P amps (SPUD)
  151. Is this a good phono preamp circuit to build?
  152. Parallel SE amp question
  153. Sharing Meter with Switch
  154. Elevating heaters in separate channels together
  155. 6DJ8 hybrid headphone amp
  156. cascode distortion Spectrum.
  157. voltmeter causes errata on scope when touching plate of V1
  158. Opto to bias triode?
  159. 6ж52п 6Z52P triode curves anyone?
  160. 815 tube in PSE
  161. Stromberg ASR-880 Biasing
  162. 6FM7 pp amp
  163. Power transformer general question
  164. Needs new 845 tubes for SET AMP
  165. Output voltage query
  166. 6BF6 Possibilities?
  167. using "wrong" primary PT
  168. Audio Innovations 500 output transformer
  169. Figuring out Heathkit T-4 OPT 51-31 turns ratio and repurpose
  170. Ask the dust ... an amp with the mighty 801A
  171. SE with low distorsion
  172. Zenith 7D31 / Magnavox 9300 amp - Thoughts and questions
  173. A300 6L6/6V6 modified Harmon Kardan A300 (XAM)
  174. Hi End Tube Amp Kit
  175. Cathode follower interstage power amp
  176. Roberts preamp & APH 1100
  177. Newbie looking for DIY Tube Pre-Amp Kit
  178. Switching of B+ and HT to lesser-used phono stage
  179. Picking operating voltage for a 5814/12AU7
  180. A well Engineered amplifier
  181. SRPP vs. transformer ratio
  182. Mosfet concertina - a better, more simple to design power amp?
  183. Current draw of different wiring/tap alternatives
  184. Which EL34/KT88 PP projects should I consider?
  185. Matching KT 88 Tubes?
  186. Hifiandaudio.com
  187. Pentode as inverted triode
  188. 300B in a EL34 PP amp via adaptor possible ?
  189. KT88 SE advice sought
  190. male42 RIAA Preamp Discussion
  191. Please advise a few decent EL34 P-P OPT.
  192. Tube swapping questions
  193. Integrated Tube Amp with tube Phono Pre-Amp
  194. EL34 PP Amplifier - would like some advice about two designs
  195. What preamp tube for a 2.5K/600 ohm OPT
  196. Question on building my first tube preamp power supply
  197. 6SN7 preamp advice
  198. Sy, ever have any LED current hogging with RLD?
  199. Opinion on schematic
  200. Zenith 5G29 Tone Controls
  201. Problem - SE Class A with toroidal OT ?
  202. Please recommend a valve are-amp kit
  203. Stressed Poseidon board?
  204. Yaqin MC-10L biasing current
  205. smelly tube amp
  206. Choosing OT for triode stage
  207. Dual mono power supply/single driver tube wiring
  208. 12DW7 (actually 4HC7) preamp ideas?
  209. 26 Linestage Without ICs
  210. Transmitter Rectifier vs. TV Damper
  211. Single stage push pulll?
  212. Tube Adapters
  213. Audio Research D150
  214. need advice on presto 3 channel mixer power supply
  215. Am i at the right track? Will this work?
  216. Sanity check RQ for new amp build
  217. P-P 8236s
  218. What about a pass band feedback in SET amplifier
  219. New amp design: PL-177 single-ended
  220. SSRP amp Gain control pot placement.
  221. Help with Budget SET amp for Klipsch Cornwalls
  222. used all tubes in Yaqin
  223. Dukane 1A775 amps?
  224. What project?
  225. What output transformers ?
  226. Aikido SE driver
  227. P-P Load Resistance vs AB1 vs AB2
  228. Will an oversize output transformer improve the sound? Wright PP2C amp.
  229. EL84 Amp Question
  230. Tube Preamp
  231. What are the limits for a 500va variac?
  232. Rogue audio tempest ii scary sounds behaviour
  233. Help me understand Allen Wright balanced amp input, please!
  234. Philips 4C35 and Valvo 5C22 radioactivity?
  235. Need expertise for my first project, 6SN7-6SJ7-6V6
  236. Music angel minix3
  237. VTL tt25
  238. Seek advice on tranformer usage
  239. Counterpoint SA 5.1 Hum Problem.
  240. Tube manufacturers... all you need to know
  241. Optimizing twisted pairs for heaters and other AC wires
  242. Modeling Piezo
  243. RCA hum cancelling OPT feedback
  244. volume control location
  245. ST70 EL34 PPP?
  246. ISO fc-30-3.5 transformer
  247. Trying to understand 12ax7 stages in this baxandall type circuit
  248. 6KV6A
  249. Soliciting advice for my first design (push-pull 6973)
  250. ISO: Scott 272 Schematic (Not on the web)

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