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

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