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  1. Building a tube pre/amp copy (6V6)
  2. 6922 pin i.d.
  3. KT88 Push Pull Amp using transistor driver stage
  4. 45 DHT HT Supply oscillating - help!
  5. exceeding plate voltage of the output tube
  6. Fisher 101D
  7. Tubes and Eagle3D
  8. Looking for old amp info
  9. Restoring an old tube amp
  10. Noob Tube Preamp Finished Kit Transformer HOT!
  11. the tv underrated tubes
  12. Headphone Amp
  13. What is needed to drive 86db speakers and sound *good*?
  14. ef86 - plate voltage
  15. Output signal distortion
  16. Minimum Acceptable Gm
  17. Anyone have experience with the 6SD7GT tube ?
  18. Identifying an ultralinear OPT
  19. A good sounding EL34 PP sch please
  20. THE CHAMP CBA-20807 1000 Watt Valve amplifier
  21. ST-35 First Build
  22. Identifying EL34 tube?
  23. Solid state relais in stean of standby swtich
  24. $75 tube amp kit on eBay???
  25. Power supply RC (ohm's law) question -NEWBIE ALERT
  26. variable power control
  27. reccommend a voltage doubler for bias?
  28. Point to Point build tips
  29. I need some fairly specific capacitors types, like polyester or silva mica.
  30. ecf82 pentode instead of ef86
  31. K-12G vs. K-502
  32. eq in a tiny Directly Heated Cathode amp
  33. Anyone ever try 6C33C SE with Aikido drive?
  34. Help with 1:2 line level input Tx's
  35. 112a preamp need comment please
  36. Excellent (Modified) Williamson Treatise
  37. Vintage Hoffman Stereo Amp Problem - fump, fump, fump
  38. Chicago BO-14 100w amp
  39. volume pot question, help.
  40. Simple B+ delay circuit for tube power amp?
  41. Dynacord Super 61, 62 spares request
  42. My small tube does it work?
  43. Approaching the best primary impedance on low or high side?
  44. CT Trafo and floating psu for circlotron?
  45. Unknown tube, need help to identify!
  46. 6L6 guidance needed
  47. Output Power Question
  48. Can the 7AK7 computer tube work as audio output tube ?
  49. Burned in Power Tubes?
  50. Driver Match for K-12G TubeAmp
  51. KT90 to KT88 with autobias
  52. SRPP DC working condition for Rk1=2Rk2
  53. NOS Russian Reflektor 6P6S (6V6) tubes were a pleasant surprise
  54. the 'sound' of a CF
  55. Hickok I-177B tester help!
  56. Found iron recycling - what possible uses?
  57. Class AB PP - is it any good ?
  58. Stereo to mono by paralleling outputs?
  59. BOX in the making
  60. How about paralleling output tubes
  61. Are they basically Borbely hybrid circuitry?
  62. Service Life at Low Plate Current
  63. Sophia Electric SE Transformers for 813 "Super Schade"
  64. 10W suitcase amp
  65. PP OT made of 2 transformers
  66. If I change B+ do I have to change the circuit?
  67. PhonoDude
  68. Lafayette Phono/Reverb /Center channel amp
  69. Seller recommendation needed.
  70. Jeffrey's Super Circlotron (hybrid)
  71. Request for obscure heater specs
  72. Jolida JD1501RC Service Manual / Schematic
  73. 80W amp with a pair of EL34
  74. Epiphone Valve Junior to HiFi Conversion
  75. Serious Distortion on my DIY Toccata Phono Preamp
  76. Hickok 539b switch settings for 6SL7
  77. Voltage Change9115v/230v) of Audio Research amplifiers
  78. HF oscillation with no load, but only on one channel.
  79. Tube innards
  80. Looking for a tube amp
  81. What happens If I use too weak output transformer?
  82. Chinese amp: 2A3 6SN7 6SJ7 5Z5P push pull
  83. 6C33C based Version for Welter's Single Ended Amp (enhanced Forward Transconductance)
  84. Single Ended EL84 B+
  85. Looking for some PSU advice ...
  86. Electronic transformer filament supply
  87. Which Salas HV shunt regulator should I choose?
  88. Traced an old valve with no specs - thoughts please
  89. Resistor socket?
  90. Dynaco PAS 3X PSU mod
  91. Best sounding 500v. electrolytics
  92. CCS's for CCD line amp?
  93. tube life
  94. For tube amps w/ high output Z - Parallel R cross spkr?
  95. High and low impedance output preamps
  96. LTspice and simulating tube circuits?
  97. Cheap & Well Made Chinese SE EL34 Amp
  98. Heathkit transformer replacement...
  99. Integrated amp will not turn on
  100. EL34, Claus Byrith amplifier, mains noise problem
  101. Need a proposal for a stereo amp
  102. 12AT7 Headphone amp
  103. 6l6/12ax7 schematics please
  104. Hybrid bridge with jfet OS
  105. Please allow me to introduce myselft
  106. Chassis Source
  107. Is my 6L6 amp damaged from EL34's
  108. VISHAY VTA 55 Bulk Metal Foil Resistors?
  109. High-Voltage Power for 6 stage pedal
  110. 10 megaohms??
  111. E180F V EF184
  112. help on gain calculation with transformer for SE tube
  113. Working with constant current charts
  114. Hum and noise in small amp
  115. My project (6c33SET)
  116. EZ260A Grommes 260A Project
  117. 18A5 sound fine in triode mode ?
  118. 6GF5 sound fine in triode mode ?
  119. Muddy 6V6 Power Amp?
  120. GM 70 Schematic needed!
  121. tube simulatie models.
  122. building vacuum tubes... some questons
  123. Hot Rodded Dynaco ST-35 - Dynakit Parts Kit
  124. Fixed bias on small signal pentode
  125. Buffer preamplifier
  126. 7027a testing
  127. decade bank values for a plate current tester
  128. anyone know the dimensions of a dynakit st-70 pcb?
  129. Help on designing full DHT SET power amplifier
  130. dc coupled volume pot value
  131. 20W OTL with 6N5P, Opinions...
  132. Finding parts
  133. Tube's JLH hybrid solution
  134. Curtis Mathes Console / TV receiver
  135. Marantz 8b feedback circuit
  136. Noisy volume pot with some tubes but not others
  137. Found an Eico HF-86 for sale, is it worth it?
  138. Paco T-60 Tube Tester
  139. Aikido all in one heater issue
  140. Need a little help with Chinese tube Preamp
  141. Choke Loaded Const. Current Draw Amp
  142. 6550 SINGLE-ENDED AMPLIFIER
  143. Balancing pp driver stage
  144. P-P 6C33
  145. Need help with Cornet 2
  146. More articles for the Wireless World Archive
  147. Recommendations for a valve amp kit
  148. 2 watt amplifier
  149. 1AX7
  150. 2 x 6as7 -> u=?
  151. Help with transformer
  152. Building a mu-follower stage
  153. ecl11 - ecl86 replacement
  154. Please comment on this grounding scheme.
  155. A tube-preamp with DSP-DAC-Touchscreen-and Music Streaming...
  156. Microphone modification help
  157. Microphone modification help
  158. First time hearing an SET
  159. Rattle can a power transformer
  160. Need better RIAA circuit for my phono amp.
  161. Input volume pot wiring
  162. Constant current heating undervoltage
  163. Some tube info that I hope is helpful
  164. Toroidal output transormers
  165. cathode bypass on opt secondary
  166. Push Pull Powersupply Test Question?
  167. Recommandation please..
  168. My new humble thread
  169. KT88 single stage pp - cascode diff amp
  170. foot switch safety question
  171. Which KT88 Brand to Buy?Sso many to choose
  172. 12ax7 perfect bias point
  173. preamplifier/driver for 807
  174. Help with Quad II hum
  175. 18K audio note output transformer
  176. Small tube amp conversion help 6x4, 6AU6, 6AQ5
  177. Hybrid never see
  178. "Next to Last" PAS Project
  179. Power supply overload
  180. Home build 6L6 pp amp buzzing noise
  181. 807 monoblocks with big PSU
  182. SET amps and crossovers.....?
  183. Sockets for 6P41S
  184. 6dj8 phono amp
  185. Jolida Score!!!!
  186. voltage boost
  187. Swinging choke value in PSUD
  188. Hum Nirvana
  189. This weekend's reading
  190. 6550-6550A-6550B-6550C - What are exactly Differences ??
  191. Interstage Transformer Questions
  192. Vacuum State FVP5A voltages
  193. can you help me out? Sencore TC114 tube tester
  194. Steve Bench's tube crossover - Help needed.
  195. transformer design equations
  196. some misc schematics, manley, rotel
  197. What happened to my tube??
  198. Tube Preamp Question
  199. Schematic for Pilot SP215
  200. Screen current through cathode resistors
  201. Gyrator design
  202. Any tips for routing heaters on a PCB
  203. 6EZ5 as drop in replacement for 6V6 tube?
  204. RIAA Preamp and equalization 12AX7
  205. Correct hum mods?
  206. Push-Pull from Stereo SE amp
  207. how to select transformers.
  208. Ultrapath or parallel feed apps. for 7591 amps?
  209. PP-UL amp with KT88
  210. Reuse these sockets and tube choice question
  211. Need help understanding this circuit
  212. Need a little help with a power supply I designed.
  213. Which tube Rectifier is good enough for 5902 tube amp ?
  214. Schematic for Masco ME-8?
  215. Transformer Rattle & Hum issue - Dynakit ST-70
  216. pio coupling caps - damaged/used?
  217. 6EZ8 (and other triple triodes) help please!
  218. Akron, Ohio
  219. 6N6P Heater and earth wiring advice
  220. united transformer corporation
  221. Capacitive v. Inductive inter-stage coupling
  222. unused secondaries on SE opt?
  223. Marco Rodint coil building info needed
  224. Scott 222B Hum
  225. how to make audio output transformer
  226. 5842 Anyone?
  227. 813 SE build
  228. Aikido LV improved psu
  229. My first HiFi project
  230. B&O 608 tube amplifier
  231. Just designed a 300b amplifier....
  232. Anyone used C3g to drive GM70?
  233. Capacitors found, have you used these?
  234. I need your help!!!!!
  235. 12au7 600 ohm output
  236. new C3g/211PSE comments pls
  237. anyone know of a source for 12 pin+ connectors?
  238. Dynaco Mark IV Power Resistor
  239. Moondog with ac on gain & driver tubes?
  240. need help again on DIY Toccata MC Phono preamp
  241. Looking for analog Tube schematic for "analogmetric 1541a" DAC
  242. newbie needs help with tube inheritance
  243. 2A3 SETs with Edcor Iron
  244. What to do with this iron (originally from PP 7355)
  245. Just for everyone's amusement....
  246. beam tetrode calculations
  247. What are the differences between LC and CLC chokes
  248. gain and mid circuits
  249. Kay 503 Schematics?
  250. Transformer Data

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