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  1. Best sounding linestage/buffer topology?
  2. Using ECC88
  3. what tubes should I upgrade a mini watt with I currently have the stock 6p14 and 6bq5
  4. EL34 cathode bias PA
  5. Tube Amp Art
  6. Quick OT Question
  7. Power Transformer
  8. ampex 354? some questions
  9. Good power Filter Capacitors
  10. Fisher 101d blow fuse
  11. Valco Model 1200 help
  12. Jolida 502A lost output...?
  13. Codename "Tapyrus", my ongoing DIY headphone amp
  14. RIAA preamp with DHTs
  15. Dynaco Mark VI feedback values
  16. Eagle PCB
  17. Ode to Tube Rollers
  18. switching tubes: good or bad idea?
  19. COnn Organ Amp DI266 Info 12v6GT tubes
  20. Please help me figure out why my plate voltage is too high here
  21. Yaqin MC10L Question for the Guru's
  22. PP PSU: How much ripple is too much ripple?
  23. Bypass caps in choke PS
  24. Grounded Grid TRANSCENDENT line stage
  25. Battery Powered Tube Amp
  26. 5Z4PJ 6N2J
  27. Almost there! opinions are welcomed(6C33SET)
  28. Speaker impedance and amp matching?
  29. r core or toroidal output trafo for dynaco st70
  30. Heathkit Returns
  31. How to get started
  32. WANTED: schematic for Eico 2050 Classic Series
  33. winding an output transformer
  34. 12AX7 vacuum tube pre-amp?
  35. motor 'defeat' switch for echoplex/etc
  36. Audionote kit L4 and L6
  37. class a audio amplifier 5w with ic ne5532
  38. Fate of my Heathkit W7-M amplifiers
  39. Trying to get my B&K 500 up and running.
  40. Tubelab simple SE ideas
  41. Newcomb E-10B Amplifer
  42. Telefunken RV218 power triode
  43. Crowhurst High Power vs Low Power Amplifiers
  44. Duncan amps PSU designer II help
  45. damper diodes
  46. EL12N in JCM800 clone
  47. Amp design exercise, mentorship needed...
  48. Need help with series filament 25l6GT amp
  49. Dynakit Mark IV Oscillation
  50. Telefunken C3M data
  51. Can a tube guru help with nu>lambda conversions?
  52. plate dissipation vs brand
  53. Solid-state replacements for PAS2/3 rectifiers?
  54. first integrated amp
  55. Problems with Unbalanced to Balanced line matching transformer from EDCOR
  56. st70A mod.kit
  57. Grampian 600u
  58. Suggest amp to drive mangnapan SMGa/MMG
  59. Valve DI box
  60. Yaqin Tube Amplifier
  61. Jensen JT-11P-1 on tube amp input
  62. Amperex PQ 6922 code decifering?
  63. 12ax7 driving a DHT out, why not?
  64. unknown Rogers Pre Power
  65. Mic pre question
  66. power tube power scaler
  67. Tube Rectifier with transformer without Center tap
  68. Can I use this stuff (does it have any value?)
  69. Full regulated power supply for 12au7(preamp)
  70. 6C33 OTL Circlotron
  71. Ammeter connection for Tubelab SE
  72. Unknown output transformer
  73. Building a tube pre/amp copy (6V6)
  74. 6922 pin i.d.
  75. KT88 Push Pull Amp using transistor driver stage
  76. 45 DHT HT Supply oscillating - help!
  77. exceeding plate voltage of the output tube
  78. Fisher 101D
  79. Tubes and Eagle3D
  80. Looking for old amp info
  81. Restoring an old tube amp
  82. Noob Tube Preamp Finished Kit Transformer HOT!
  83. the tv underrated tubes
  84. Headphone Amp
  85. What is needed to drive 86db speakers and sound *good*?
  86. ef86 - plate voltage
  87. Output signal distortion
  88. Minimum Acceptable Gm
  89. Anyone have experience with the 6SD7GT tube ?
  90. Identifying an ultralinear OPT
  91. A good sounding EL34 PP sch please
  92. THE CHAMP CBA-20807 1000 Watt Valve amplifier
  93. ST-35 First Build
  94. Identifying EL34 tube?
  95. Solid state relais in stean of standby swtich
  96. $75 tube amp kit on eBay???
  97. Power supply RC (ohm's law) question -NEWBIE ALERT
  98. variable power control
  99. reccommend a voltage doubler for bias?
  100. Point to Point build tips
  101. I need some fairly specific capacitors types, like polyester or silva mica.
  102. ecf82 pentode instead of ef86
  103. K-12G vs. K-502
  104. eq in a tiny Directly Heated Cathode amp
  105. Anyone ever try 6C33C SE with Aikido drive?
  106. Help with 1:2 line level input Tx's
  107. 112a preamp need comment please
  108. Excellent (Modified) Williamson Treatise
  109. Vintage Hoffman Stereo Amp Problem - fump, fump, fump
  110. Chicago BO-14 100w amp
  111. ef861 - guitar preamp
  112. volume pot question, help.
  113. Simple B+ delay circuit for tube power amp?
  114. Dynacord Super 61, 62 spares request
  115. My small tube does it work?
  116. Approaching the best primary impedance on low or high side?
  117. CT Trafo and floating psu for circlotron?
  118. Unknown tube, need help to identify!
  119. 6L6 guidance needed
  120. Output Power Question
  121. Can the 7AK7 computer tube work as audio output tube ?
  122. Burned in Power Tubes?
  123. Driver Match for K-12G TubeAmp
  124. KT90 to KT88 with autobias
  125. SRPP DC working condition for Rk1=2Rk2
  126. NOS Russian Reflektor 6P6S (6V6) tubes were a pleasant surprise
  127. the 'sound' of a CF
  128. Hickok I-177B tester help!
  129. Illinois Capacitor or Cornell_Dubilier
  130. Found iron recycling - what possible uses?
  131. Class AB PP - is it any good ?
  132. Stereo to mono by paralleling outputs?
  133. BOX in the making
  134. How about paralleling output tubes
  135. Are they basically Borbely hybrid circuitry?
  136. Service Life at Low Plate Current
  137. Sophia Electric SE Transformers for 813 "Super Schade"
  138. 10W suitcase amp
  139. PP OT made of 2 transformers
  140. If I change B+ do I have to change the circuit?
  141. PhonoDude
  142. Lafayette Phono/Reverb /Center channel amp
  143. Seller recommendation needed.
  144. Jeffrey's Super Circlotron (hybrid)
  145. Request for obscure heater specs
  146. Jolida JD1501RC Service Manual / Schematic
  147. 80W amp with a pair of EL34
  148. Epiphone Valve Junior to HiFi Conversion
  149. Serious Distortion on my DIY Toccata Phono Preamp
  150. Hickok 539b switch settings for 6SL7
  151. help me designing parallel SE guitar amp with 12at7 as power tube
  152. Voltage Change9115v/230v) of Audio Research amplifiers
  153. HF oscillation with no load, but only on one channel.
  154. Tube innards
  155. Peavey valveking 112 lead (distortion) channel doesn't work
  156. Looking for a tube amp
  157. What happens If I use too weak output transformer?
  158. Chinese amp: 2A3 6SN7 6SJ7 5Z5P push pull
  159. 6C33C based Version for Welter's Single Ended Amp (enhanced Forward Transconductance)
  160. Single Ended EL84 B+
  161. Looking for some PSU advice ...
  162. Electronic transformer filament supply
  163. Which Salas HV shunt regulator should I choose?
  164. Traced an old valve with no specs - thoughts please
  165. Resistor socket?
  166. Dynaco PAS 3X PSU mod
  167. Best sounding 500v. electrolytics
  168. CCS's for CCD line amp?
  169. tube life
  170. For tube amps w/ high output Z - Parallel R cross spkr?
  171. High and low impedance output preamps
  172. LTspice and simulating tube circuits?
  173. Cheap & Well Made Chinese SE EL34 Amp
  174. Heathkit transformer replacement...
  175. Integrated amp will not turn on
  176. EL34, Claus Byrith amplifier, mains noise problem
  177. Need a proposal for a stereo amp
  178. 12AT7 Headphone amp
  179. 6l6/12ax7 schematics please
  180. Hybrid bridge with jfet OS
  181. Please allow me to introduce myselft
  182. Chassis Source
  183. Is my 6L6 amp damaged from EL34's
  184. VISHAY VTA 55 Bulk Metal Foil Resistors?
  185. High-Voltage Power for 6 stage pedal
  186. 10 megaohms??
  187. E180F V EF184
  188. help on gain calculation with transformer for SE tube
  189. Working with constant current charts
  190. Hum and noise in small amp
  191. My project (6c33SET)
  192. EZ260A Grommes 260A Project
  193. 18A5 sound fine in triode mode ?
  194. 6GF5 sound fine in triode mode ?
  195. Muddy 6V6 Power Amp?
  196. GM 70 Schematic needed!
  197. tube simulatie models.
  198. building vacuum tubes... some questons
  199. Hot Rodded Dynaco ST-35 - Dynakit Parts Kit
  200. Fixed bias on small signal pentode
  201. Buffer preamplifier
  202. 7027a testing
  203. decade bank values for a plate current tester
  204. anyone know the dimensions of a dynakit st-70 pcb?
  205. Help on designing full DHT SET power amplifier
  206. dc coupled volume pot value
  207. 20W OTL with 6N5P, Opinions...
  208. Finding parts
  209. Tube's JLH hybrid solution
  210. Curtis Mathes Console / TV receiver
  211. Marantz 8b feedback circuit
  212. Noisy volume pot with some tubes but not others
  213. Found an Eico HF-86 for sale, is it worth it?
  214. Paco T-60 Tube Tester
  215. Aikido all in one heater issue
  216. Need a little help with Chinese tube Preamp
  217. Choke Loaded Const. Current Draw Amp
  218. 6550 SINGLE-ENDED AMPLIFIER
  219. Balancing pp driver stage
  220. P-P 6C33
  221. Need help with Cornet 2
  222. Sweet folly: a tube SMPS
  223. More articles for the Wireless World Archive
  224. Recommendations for a valve amp kit
  225. 2 watt amplifier
  226. 1AX7
  227. 2 x 6as7 -> u=?
  228. Help with transformer
  229. Building a mu-follower stage
  230. ecl11 - ecl86 replacement
  231. Please comment on this grounding scheme.
  232. A tube-preamp with DSP-DAC-Touchscreen-and Music Streaming...
  233. Microphone modification help
  234. Microphone modification help
  235. First time hearing an SET
  236. Rattle can a power transformer
  237. Need better RIAA circuit for my phono amp.
  238. Input volume pot wiring
  239. Constant current heating undervoltage
  240. Some tube info that I hope is helpful
  241. Toroidal output transormers
  242. cathode bypass on opt secondary
  243. Push Pull Powersupply Test Question?
  244. Recommandation please..
  245. My new humble thread
  246. KT88 single stage pp - cascode diff amp
  247. foot switch safety question
  248. Which KT88 Brand to Buy?Sso many to choose
  249. 12ax7 perfect bias point
  250. preamplifier/driver for 807

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