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  1. Eagle PCB
  2. Ode to Tube Rollers
  3. switching tubes: good or bad idea?
  4. COnn Organ Amp DI266 Info 12v6GT tubes
  5. Please help me figure out why my plate voltage is too high here
  6. Yaqin MC10L Question for the Guru's
  7. PP PSU: How much ripple is too much ripple?
  8. Bypass caps in choke PS
  9. Grounded Grid TRANSCENDENT line stage
  10. Battery Powered Tube Amp
  11. 5Z4PJ 6N2J
  12. Almost there! opinions are welcomed(6C33SET)
  13. Speaker impedance and amp matching?
  14. r core or toroidal output trafo for dynaco st70
  15. Heathkit Returns
  16. How to get started
  17. WANTED: schematic for Eico 2050 Classic Series
  18. winding an output transformer
  19. 12AX7 vacuum tube pre-amp?
  20. motor 'defeat' switch for echoplex/etc
  21. Audionote kit L4 and L6
  22. class a audio amplifier 5w with ic ne5532
  23. Fate of my Heathkit W7-M amplifiers
  24. Trying to get my B&K 500 up and running.
  25. Newcomb E-10B Amplifer
  26. Telefunken RV218 power triode
  27. Crowhurst High Power vs Low Power Amplifiers
  28. Duncan amps PSU designer II help
  29. damper diodes
  30. EL12N in JCM800 clone
  31. Amp design exercise, mentorship needed...
  32. Need help with series filament 25l6GT amp
  33. Dynakit Mark IV Oscillation
  34. Telefunken C3M data
  35. Can a tube guru help with nu>lambda conversions?
  36. plate dissipation vs brand
  37. Solid-state replacements for PAS2/3 rectifiers?
  38. first integrated amp
  39. Problems with Unbalanced to Balanced line matching transformer from EDCOR
  40. st70A mod.kit
  41. Grampian 600u
  42. Suggest amp to drive mangnapan SMGa/MMG
  43. Valve DI box
  44. Yaqin Tube Amplifier
  45. Jensen JT-11P-1 on tube amp input
  46. Amperex PQ 6922 code decifering?
  47. 12ax7 driving a DHT out, why not?
  48. unknown Rogers Pre Power
  49. Mic pre question
  50. power tube power scaler
  51. Tube Rectifier with transformer without Center tap
  52. Can I use this stuff (does it have any value?)
  53. Full regulated power supply for 12au7(preamp)
  54. 6C33 OTL Circlotron
  55. Unknown output transformer
  56. Building a tube pre/amp copy (6V6)
  57. 6922 pin i.d.
  58. KT88 Push Pull Amp using transistor driver stage
  59. 45 DHT HT Supply oscillating - help!
  60. exceeding plate voltage of the output tube
  61. Fisher 101D
  62. Tubes and Eagle3D
  63. Looking for old amp info
  64. Restoring an old tube amp
  65. Noob Tube Preamp Finished Kit Transformer HOT!
  66. the tv underrated tubes
  67. Headphone Amp
  68. What is needed to drive 86db speakers and sound *good*?
  69. ef86 - plate voltage
  70. Output signal distortion
  71. Minimum Acceptable Gm
  72. Anyone have experience with the 6SD7GT tube ?
  73. Identifying an ultralinear OPT
  74. A good sounding EL34 PP sch please
  75. THE CHAMP CBA-20807 1000 Watt Valve amplifier
  76. ST-35 First Build
  77. Identifying EL34 tube?
  78. Solid state relais in stean of standby swtich
  79. $75 tube amp kit on eBay???
  80. Power supply RC (ohm's law) question -NEWBIE ALERT
  81. variable power control
  82. reccommend a voltage doubler for bias?
  83. Point to Point build tips
  84. I need some fairly specific capacitors types, like polyester or silva mica.
  85. ecf82 pentode instead of ef86
  86. K-12G vs. K-502
  87. eq in a tiny Directly Heated Cathode amp
  88. Anyone ever try 6C33C SE with Aikido drive?
  89. Help with 1:2 line level input Tx's
  90. 112a preamp need comment please
  91. Excellent (Modified) Williamson Treatise
  92. Vintage Hoffman Stereo Amp Problem - fump, fump, fump
  93. Chicago BO-14 100w amp
  94. volume pot question, help.
  95. Simple B+ delay circuit for tube power amp?
  96. Dynacord Super 61, 62 spares request
  97. My small tube does it work?
  98. Approaching the best primary impedance on low or high side?
  99. CT Trafo and floating psu for circlotron?
  100. Unknown tube, need help to identify!
  101. 6L6 guidance needed
  102. Output Power Question
  103. Can the 7AK7 computer tube work as audio output tube ?
  104. Burned in Power Tubes?
  105. Driver Match for K-12G TubeAmp
  106. KT90 to KT88 with autobias
  107. SRPP DC working condition for Rk1=2Rk2
  108. NOS Russian Reflektor 6P6S (6V6) tubes were a pleasant surprise
  109. the 'sound' of a CF
  110. Found iron recycling - what possible uses?
  111. Class AB PP - is it any good ?
  112. Stereo to mono by paralleling outputs?
  113. BOX in the making
  114. How about paralleling output tubes
  115. Are they basically Borbely hybrid circuitry?
  116. Service Life at Low Plate Current
  117. Sophia Electric SE Transformers for 813 "Super Schade"
  118. 10W suitcase amp
  119. PP OT made of 2 transformers
  120. If I change B+ do I have to change the circuit?
  121. PhonoDude
  122. Lafayette Phono/Reverb /Center channel amp
  123. Seller recommendation needed.
  124. Jeffrey's Super Circlotron (hybrid)
  125. Request for obscure heater specs
  126. Jolida JD1501RC Service Manual / Schematic
  127. 80W amp with a pair of EL34
  128. Epiphone Valve Junior to HiFi Conversion
  129. Serious Distortion on my DIY Toccata Phono Preamp
  130. Voltage Change9115v/230v) of Audio Research amplifiers
  131. HF oscillation with no load, but only on one channel.
  132. Tube innards
  133. Looking for a tube amp
  134. What happens If I use too weak output transformer?
  135. Chinese amp: 2A3 6SN7 6SJ7 5Z5P push pull
  136. 6C33C based Version for Welter's Single Ended Amp (enhanced Forward Transconductance)
  137. Single Ended EL84 B+
  138. Looking for some PSU advice ...
  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. Best sounding 500v. electrolytics
  144. CCS's for CCD line amp?
  145. tube life
  146. For tube amps w/ high output Z - Parallel R cross spkr?
  147. High and low impedance output preamps
  148. LTspice and simulating tube circuits?
  149. Cheap & Well Made Chinese SE EL34 Amp
  150. Heathkit transformer replacement...
  151. Integrated amp will not turn on
  152. EL34, Claus Byrith amplifier, mains noise problem
  153. Need a proposal for a stereo amp
  154. 12AT7 Headphone amp
  155. 6l6/12ax7 schematics please
  156. Hybrid bridge with jfet OS
  157. Please allow me to introduce myselft
  158. Chassis Source
  159. Is my 6L6 amp damaged from EL34's
  160. VISHAY VTA 55 Bulk Metal Foil Resistors?
  161. High-Voltage Power for 6 stage pedal
  162. 10 megaohms??
  163. E180F V EF184
  164. help on gain calculation with transformer for SE tube
  165. Working with constant current charts
  166. Hum and noise in small amp
  167. My project (6c33SET)
  168. EZ260A Grommes 260A Project
  169. 18A5 sound fine in triode mode ?
  170. 6GF5 sound fine in triode mode ?
  171. Muddy 6V6 Power Amp?
  172. GM 70 Schematic needed!
  173. tube simulatie models.
  174. building vacuum tubes... some questons
  175. Hot Rodded Dynaco ST-35 - Dynakit Parts Kit
  176. Fixed bias on small signal pentode
  177. Buffer preamplifier
  178. 7027a testing
  179. decade bank values for a plate current tester
  180. anyone know the dimensions of a dynakit st-70 pcb?
  181. Help on designing full DHT SET power amplifier
  182. dc coupled volume pot value
  183. 20W OTL with 6N5P, Opinions...
  184. Finding parts
  185. Tube's JLH hybrid solution
  186. Curtis Mathes Console / TV receiver
  187. Marantz 8b feedback circuit
  188. Noisy volume pot with some tubes but not others
  189. Found an Eico HF-86 for sale, is it worth it?
  190. Aikido all in one heater issue
  191. Need a little help with Chinese tube Preamp
  192. Choke Loaded Const. Current Draw Amp
  193. 6550 SINGLE-ENDED AMPLIFIER
  194. Balancing pp driver stage
  195. P-P 6C33
  196. Need help with Cornet 2
  197. More articles for the Wireless World Archive
  198. Recommendations for a valve amp kit
  199. 2 watt amplifier
  200. 1AX7
  201. 2 x 6as7 -> u=?
  202. Help with transformer
  203. Building a mu-follower stage
  204. ecl11 - ecl86 replacement
  205. Please comment on this grounding scheme.
  206. A tube-preamp with DSP-DAC-Touchscreen-and Music Streaming...
  207. Microphone modification help
  208. Microphone modification help
  209. First time hearing an SET
  210. Rattle can a power transformer
  211. Need better RIAA circuit for my phono amp.
  212. Input volume pot wiring
  213. Constant current heating undervoltage
  214. Some tube info that I hope is helpful
  215. Toroidal output transormers
  216. cathode bypass on opt secondary
  217. Push Pull Powersupply Test Question?
  218. Recommandation please..
  219. My new humble thread
  220. KT88 single stage pp - cascode diff amp
  221. foot switch safety question
  222. Which KT88 Brand to Buy?Sso many to choose
  223. 12ax7 perfect bias point
  224. preamplifier/driver for 807
  225. Help with Quad II hum
  226. 18K audio note output transformer
  227. Small tube amp conversion help 6x4, 6AU6, 6AQ5
  228. Hybrid never see
  229. "Next to Last" PAS Project
  230. Power supply overload
  231. Home build 6L6 pp amp buzzing noise
  232. 807 monoblocks with big PSU
  233. SET amps and crossovers.....?
  234. Sockets for 6P41S
  235. 6dj8 phono amp
  236. Jolida Score!!!!
  237. voltage boost
  238. Swinging choke value in PSUD
  239. Hum Nirvana
  240. This weekend's reading
  241. 6550-6550A-6550B-6550C - What are exactly Differences ??
  242. Interstage Transformer Questions
  243. Vacuum State FVP5A voltages
  244. Steve Bench's tube crossover - Help needed.
  245. transformer design equations
  246. some misc schematics, manley, rotel
  247. What happened to my tube??
  248. Tube Preamp Question
  249. Schematic for Pilot SP215
  250. Screen current through cathode resistors

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