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  1. Tube Amp Art
  2. Quick OT Question
  3. Power Transformer
  4. ampex 354? some questions
  5. Good power Filter Capacitors
  6. Fisher 101d blow fuse
  7. Jolida 502A lost output...?
  8. Codename "Tapyrus", my ongoing DIY headphone amp
  9. RIAA preamp with DHTs
  10. Dynaco Mark VI feedback values
  11. Eagle PCB
  12. Ode to Tube Rollers
  13. switching tubes: good or bad idea?
  14. COnn Organ Amp DI266 Info 12v6GT tubes
  15. Please help me figure out why my plate voltage is too high here
  16. Yaqin MC10L Question for the Guru's
  17. PP PSU: How much ripple is too much ripple?
  18. Bypass caps in choke PS
  19. Grounded Grid TRANSCENDENT line stage
  20. Battery Powered Tube Amp
  21. 5Z4PJ 6N2J
  22. Almost there! opinions are welcomed(6C33SET)
  23. Speaker impedance and amp matching?
  24. r core or toroidal output trafo for dynaco st70
  25. Heathkit Returns
  26. How to get started
  27. WANTED: schematic for Eico 2050 Classic Series
  28. winding an output transformer
  29. 12AX7 vacuum tube pre-amp?
  30. Audionote kit L4 and L6
  31. class a audio amplifier 5w with ic ne5532
  32. Fate of my Heathkit W7-M amplifiers
  33. Trying to get my B&K 500 up and running.
  34. Newcomb E-10B Amplifer
  35. Telefunken RV218 power triode
  36. Crowhurst High Power vs Low Power Amplifiers
  37. damper diodes
  38. EL12N in JCM800 clone
  39. Amp design exercise, mentorship needed...
  40. Need help with series filament 25l6GT amp
  41. Dynakit Mark IV Oscillation
  42. Telefunken C3M data
  43. Can a tube guru help with nu>lambda conversions?
  44. plate dissipation vs brand
  45. Solid-state replacements for PAS2/3 rectifiers?
  46. first integrated amp
  47. Problems with Unbalanced to Balanced line matching transformer from EDCOR
  48. st70A mod.kit
  49. Grampian 600u
  50. Suggest amp to drive mangnapan SMGa/MMG
  51. Yaqin Tube Amplifier
  52. Jensen JT-11P-1 on tube amp input
  53. Amperex PQ 6922 code decifering?
  54. 12ax7 driving a DHT out, why not?
  55. unknown Rogers Pre Power
  56. power tube power scaler
  57. Tube Rectifier with transformer without Center tap
  58. Can I use this stuff (does it have any value?)
  59. Full regulated power supply for 12au7(preamp)
  60. 6C33 OTL Circlotron
  61. Unknown output transformer
  62. Building a tube pre/amp copy (6V6)
  63. 6922 pin i.d.
  64. KT88 Push Pull Amp using transistor driver stage
  65. 45 DHT HT Supply oscillating - help!
  66. exceeding plate voltage of the output tube
  67. Fisher 101D
  68. Looking for old amp info
  69. Restoring an old tube amp
  70. Noob Tube Preamp Finished Kit Transformer HOT!
  71. the tv underrated tubes
  72. Headphone Amp
  73. What is needed to drive 86db speakers and sound *good*?
  74. ef86 - plate voltage
  75. Output signal distortion
  76. Minimum Acceptable Gm
  77. Anyone have experience with the 6SD7GT tube ?
  78. Identifying an ultralinear OPT
  79. A good sounding EL34 PP sch please
  80. THE CHAMP CBA-20807 1000 Watt Valve amplifier
  81. ST-35 First Build
  82. Identifying EL34 tube?
  83. Solid state relais in stean of standby swtich
  84. $75 tube amp kit on eBay???
  85. variable power control
  86. reccommend a voltage doubler for bias?
  87. ecf82 pentode instead of ef86
  88. K-12G vs. K-502
  89. eq in a tiny Directly Heated Cathode amp
  90. Anyone ever try 6C33C SE with Aikido drive?
  91. Help with 1:2 line level input Tx's
  92. 112a preamp need comment please
  93. Excellent (Modified) Williamson Treatise
  94. Vintage Hoffman Stereo Amp Problem - fump, fump, fump
  95. Chicago BO-14 100w amp
  96. volume pot question, help.
  97. Simple B+ delay circuit for tube power amp?
  98. My small tube does it work?
  99. Approaching the best primary impedance on low or high side?
  100. CT Trafo and floating psu for circlotron?
  101. Unknown tube, need help to identify!
  102. 6L6 guidance needed
  103. Output Power Question
  104. Can the 7AK7 computer tube work as audio output tube ?
  105. Burned in Power Tubes?
  106. Driver Match for K-12G TubeAmp
  107. KT90 to KT88 with autobias
  108. SRPP DC working condition for Rk1=2Rk2
  109. NOS Russian Reflektor 6P6S (6V6) tubes were a pleasant surprise
  110. the 'sound' of a CF
  111. Found iron recycling - what possible uses?
  112. Class AB PP - is it any good ?
  113. Stereo to mono by paralleling outputs?
  114. BOX in the making
  115. How about paralleling output tubes
  116. Are they basically Borbely hybrid circuitry?
  117. Service Life at Low Plate Current
  118. Sophia Electric SE Transformers for 813 "Super Schade"
  119. 10W suitcase amp
  120. PP OT made of 2 transformers
  121. If I change B+ do I have to change the circuit?
  122. PhonoDude
  123. Lafayette Phono/Reverb /Center channel amp
  124. Seller recommendation needed.
  125. Jeffrey's Super Circlotron (hybrid)
  126. Request for obscure heater specs
  127. Jolida JD1501RC Service Manual / Schematic
  128. 80W amp with a pair of EL34
  129. Epiphone Valve Junior to HiFi Conversion
  130. Serious Distortion on my DIY Toccata Phono Preamp
  131. Voltage Change9115v/230v) of Audio Research amplifiers
  132. HF oscillation with no load, but only on one channel.
  133. Tube innards
  134. Looking for a tube amp
  135. What happens If I use too weak output transformer?
  136. Chinese amp: 2A3 6SN7 6SJ7 5Z5P push pull
  137. 6C33C based Version for Welter's Single Ended Amp (enhanced Forward Transconductance)
  138. Single Ended EL84 B+
  139. Electronic transformer filament supply
  140. Which Salas HV shunt regulator should I choose?
  141. Traced an old valve with no specs - thoughts please
  142. Dynaco PAS 3X PSU mod
  143. CCS's for CCD line amp?
  144. tube life
  145. For tube amps w/ high output Z - Parallel R cross spkr?
  146. High and low impedance output preamps
  147. Cheap & Well Made Chinese SE EL34 Amp
  148. Heathkit transformer replacement...
  149. Integrated amp will not turn on
  150. EL34, Claus Byrith amplifier, mains noise problem
  151. Need a proposal for a stereo amp
  152. 12AT7 Headphone amp
  153. 6l6/12ax7 schematics please
  154. Hybrid bridge with jfet OS
  155. Please allow me to introduce myselft
  156. Is my 6L6 amp damaged from EL34's
  157. 10 megaohms??
  158. E180F V EF184
  159. help on gain calculation with transformer for SE tube
  160. Working with constant current charts
  161. Hum and noise in small amp
  162. My project (6c33SET)
  163. EZ260A Grommes 260A Project
  164. 18A5 sound fine in triode mode ?
  165. 6GF5 sound fine in triode mode ?
  166. Muddy 6V6 Power Amp?
  167. GM 70 Schematic needed!
  168. tube simulatie models.
  169. building vacuum tubes... some questons
  170. Hot Rodded Dynaco ST-35 - Dynakit Parts Kit
  171. Fixed bias on small signal pentode
  172. Buffer preamplifier
  173. 7027a testing
  174. decade bank values for a plate current tester
  175. anyone know the dimensions of a dynakit st-70 pcb?
  176. Help on designing full DHT SET power amplifier
  177. dc coupled volume pot value
  178. 20W OTL with 6N5P, Opinions...
  179. Tube's JLH hybrid solution
  180. Curtis Mathes Console / TV receiver
  181. Marantz 8b feedback circuit
  182. Found an Eico HF-86 for sale, is it worth it?
  183. Aikido all in one heater issue
  184. Need a little help with Chinese tube Preamp
  185. Choke Loaded Const. Current Draw Amp
  186. 6550 Single-Ended Amplifier
  187. Balancing pp driver stage
  188. P-P 6C33
  189. Need help with Cornet 2
  190. More articles for the Wireless World Archive
  191. Recommendations for a valve amp kit
  192. 2 watt amplifier
  193. 1AX7
  194. 2 x 6as7 -> u=?
  195. Help with transformer
  196. Building a mu-follower stage
  197. ecl11 - ecl86 replacement
  198. Please comment on this grounding scheme.
  199. A tube-preamp with DSP-DAC-Touchscreen-and Music Streaming...
  200. First time hearing an SET
  201. Rattle can a power transformer
  202. Need better RIAA circuit for my phono amp.
  203. Constant current heating undervoltage
  204. Some tube info that I hope is helpful
  205. Toroidal output transormers
  206. cathode bypass on opt secondary
  207. Push Pull Powersupply Test Question?
  208. Recommandation please..
  209. My new humble thread
  210. KT88 single stage pp - cascode diff amp
  211. Which KT88 Brand to Buy?Sso many to choose
  212. 12ax7 perfect bias point
  213. preamplifier/driver for 807
  214. Help with Quad II hum
  215. 18K audio note output transformer
  216. Small tube amp conversion help 6x4, 6AU6, 6AQ5
  217. Hybrid never see
  218. "Next to Last" PAS Project
  219. Power supply overload
  220. Home build 6L6 pp amp buzzing noise
  221. 807 monoblocks with big PSU
  222. SET amps and crossovers.....?
  223. Sockets for 6P41S
  224. 6dj8 phono amp
  225. Jolida Score!!!!
  226. voltage boost
  227. Swinging choke value in PSUD
  228. Hum Nirvana
  229. This weekend's reading
  230. 6550-6550A-6550B-6550C - What are exactly Differences ??
  231. Interstage Transformer Questions
  232. Vacuum State FVP5A voltages
  233. Steve Bench's tube crossover - Help needed.
  234. transformer design equations
  235. some misc schematics, manley, rotel
  236. What happened to my tube??
  237. Tube Preamp Question
  238. Schematic for Pilot SP215
  239. Screen current through cathode resistors
  240. Gyrator design
  241. Any tips for routing heaters on a PCB
  242. 6EZ5 as drop in replacement for 6V6 tube?
  243. RIAA Preamp and equalization 12AX7
  244. Correct hum mods?
  245. Push-Pull from Stereo SE amp
  246. how to select transformers.
  247. Ultrapath or parallel feed apps. for 7591 amps?
  248. PP-UL amp with KT88
  249. Reuse these sockets and tube choice question
  250. Need help understanding this circuit

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