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  1. The History of the EL-34 and other Pentodes and Beam Tetrodes.
  2. PCF what?
  3. stupid question about heater wire to ground
  4. OTL All American Five? (or Ten)
  5. Scored a very nice H H Scott 272!
  6. Simple DIY Stereo Tube Amp with around 20W
  7. Maton Amp
  8. New Tech
  9. LS8 pre kit as an output stage for DAC?
  10. Japanese Valves
  11. B+ delay for DHT amp
  12. QQV03-20A/CV2799
  13. 0,22 0,33 0,47.....uF
  14. Most powerful SE DIY design?
  15. 420vdc supply for a tube amp
  16. PSE 2a3 operating points?
  17. Ju-Jutsu: The Ultimate Monoblock
  18. Looking for Phono Stage ...
  19. Finished my Fisher 460t-thanks
  20. Datasheet Cpk values
  21. Eico635 tester
  22. 6p3s...
  23. Help with Amp Salvage
  24. 808 SE Build
  25. how to bias my rebuilt dynaco st 70
  26. Want help - RCA Tube Manual RIAA Phono Stage
  27. Tube Pre-amp for both CD and Phono inputs
  28. Cascode Driver Oscillation
  29. 872b or 6gj5a for a homebrew bass amp
  30. how does it sound and perform?
  31. Bootstrapped long tail
  32. Thorens TEM 3200 clone
  33. Identifying this RCA Transformer
  34. Tube burning
  35. Add Standby Directly after Rectifier, or After First Filter Stage?
  36. Help with some tube ID
  37. CCS power amp bias
  38. this is EL34 tube of what model?
  39. Looking for constructive criticism on my first design
  40. Audio note kit 1 vs Meishu
  41. Tube Amp Gain V.S. RF Gain
  42. Kool-mu material for building audio transformer
  43. Buzz/Hum in Matrix amplifier
  44. Optimation PA-250AC Lab-Grade Audio Amplifier
  45. RS1003 in SE triode-UL monoblocks
  46. Bypass capacitors in Tube amps
  47. Basic question re: gNFB around 3 stages
  48. James PP Audio Transformers, any good?
  49. Seeking advice for tube amp kit on,seems to be, chinese site
  50. Tube pricing from 1981
  51. 6e5p WCF headphone amp with no cap!
  52. "How it's made" vacuum tubes..
  53. Citation I and IV phono schematic query
  54. GS-4V High-mu russian triode for RIAA preamp
  55. good source for amp chassis in europe?
  56. Help identify and replacement of ? resistor
  57. New tube amp diy kit required power?
  58. Decoupling DC heater supply between valves..benefit?
  59. The Aikido Comedy: Straight Talk
  60. Recapping tube preamp questions
  61. A tube amp that's actually a tesla coil.
  62. Tube "Orientation"
  63. 18 watt tremolo vvr
  64. Pre amp output, would this work?
  65. Aikido Power Amp.....Possible??
  66. 12AX7 questions
  67. 6550 PUSH-PULL
  68. CCS at plate? Unknown schematic part
  69. Most odd grid choke behaviour.
  70. Spec for Altec TP-404 Transformer
  71. why do wimpy drivers for 2A3 work as well as they do?
  72. Seeking advice on Tube buffer / pre-amp
  73. 8x Push-pull KT88 class A in triode mode
  74. Tube Pre dull into Tube Amp - cause ?
  75. FINALLY I can start building my GM70
  76. Russian triodes ГИ-15Б arriving in a few days
  77. Cap or resistor
  78. KT88/PP driver confusion
  79. Simple SE GU-50
  80. Darling 1626
  81. 01a DHT Preamp
  82. Suitable tubes for Gomes output
  83. phono line stage project
  84. Whats wrong with this circuit?
  85. Any Newcomb Gurus.?
  86. Preamp Tube MU Level?
  87. SRPP Paraccordion topology ?
  88. Replacing 6922 with 6FQ7 in Conrad Johnson ET3 preamp
  89. Modification of a Chinese KT90 PP amplifier
  90. Tricky Headphone Amp design for AK4396
  91. How to know voltage bias adjustmentwith this data?
  92. Strange Stability Enhancement Trick
  93. has anyone bought tubes from http://www.tangotubes.com/
  94. “Earmax / G3 / Morgan Jones / Cavalli” Headphone Amp Reissue with 6SN7 Steroids
  95. Ever heard of British transofmer company "Ro"?
  96. A friend gave me some random tubes...
  97. Replacement for 6e2 without vu
  98. PP GU50 triode strapped project
  99. Tube VAS stage questions???
  100. OT impedance help: 9.8 vs 8k
  101. popping & crackling noise from restored valve AM radio
  102. Choosing 6550 PP Output Transformer
  103. Reversing Interstage Transformer
  104. Aikido 9 pin All in One Build
  105. KT88 PP UL Design Help Needed
  106. Cayin A-300B schematic needed
  107. Please Recommend a Preamp!
  108. Which Antek transforms to use
  109. Integrated Amp as Preamp and Subwoofer amp
  110. Uses for 715C Pulse Tetrode
  111. PP KT-88 w/866A MV HT Supply
  112. EC88 (6DL4) NOS Mullard - any use at all?
  113. Advice sought on thermionic headphone amp
  114. Eico HF-81: Input Selector bypass
  115. 12b4 bass rolloff problem
  116. No Right ch sound on yaqin mc10l
  117. tester causing bias to rise?
  118. Heaters & Filaments: AC vs. DC
  119. Old HP power transformers... need some wiring advice!
  120. Old HP power transformers... need some wiring advice!
  121. RCA RS177H just dosen't sound right! Caps?
  122. silicon or tube rectifier in an EL34 SE
  123. Help original 300G LEGACY
  124. 813 Tube-Steak!
  125. Basic 12AU7 heatrr question
  126. Shipping a vacuum tube to China
  127. 6DJ8/ECC88-SRPP Tube Preamplifier
  128. Help needed: hum noise in Eimac 250TL driven by 75TL Single End Amplifier
  129. Found tons of Tubes,and many other parts
  130. Ampeg B15 Heritage Clone Help
  131. EZ80 Data Sheets, R-Lim and Max Cap
  132. Filament Voltages CT vs Non-CT
  133. Troubleshooting help needed
  134. What is it? Tube guessology
  135. Bass & Treble controls, or rather lack of.
  136. Quicksilver 8417 Power Supply Question
  137. Why a sudden distortion in treble of this SET amplifier?
  138. 5f1 Champ grounding
  139. Antitriode PP with EL34
  140. How to calculate Pout for Push Pull design
  141. Newbie Question - Power Transformer vs Isolation Transformer
  142. All tubes red plating
  143. Exceeding bias voltage?
  144. Vacuum State RTP Preamp Problem
  145. Alfred Morgan Tube Preamplifier
  146. 845 vs GM70
  147. Looking for project suggestions - 12au7 pre-amp?
  148. Contemporary tradition breaking amp schematics.
  149. ul - triode coupled screen grid resistor
  150. Optimum driver valve for an interstage-transformer-driven SE 300B
  151. 6C33C
  152. Soundcraftsmen 5050
  153. Tetra Phono Question
  154. WF tube
  155. Opt laminations isolation
  156. Heretical Source
  157. Broskie auto bias
  158. heater wiring - the Good the Bad and the Ugly
  159. AC Line Filter
  160. Counterpoint SA5000 Help
  161. Problem with ECC83 measurement values - please help
  162. Newbie Bias help ?
  163. AV305m AVVT
  164. Pot mechanical resistance and restoration..
  165. HMV Little Nipper mantle radio = 1 STEREO
  166. What's the simplest way to adjust filament voltage?
  167. GDAP-06
  168. Audio Note L6 - Schematic?
  169. Preventing HV flashover on socket pins
  170. Best "Vintage" Stereo Pres that SoftClip and lotsa Harmonics
  171. SE with PP OPT's?
  172. 12ax7/12AT7 Recommendations
  173. HELP: Eimac 75TL amp high frequency roll off
  174. unison reserch s8, let's build it!
  175. Where do super high end companies get their transformers?
  176. Tube Tester Panel Meter
  177. Attic find AMP
  178. Help getting Imax and Eb approximations for a push-pull amp
  179. Is this amp OK to buy, or is this a problem?
  180. Swirling Harmonics, can it be described
  181. Line stage with u-follower and nfb
  182. Newbie looking for help, pre-out to tube amp.
  183. Unison research integrated ampliphier schematics
  184. FET CCS anode load and RFI/oscillation.
  185. Old schematic
  186. Newbie Looking for Replacement OPTS Motorola Console Amp
  187. Merlyn- May AudioXpress
  188. How to clean tubes?
  189. does the 3A5 have the stones to drive a 2A3?
  190. New amp: 13DE7 SE hybrid
  191. My amp is motorboating, improve it with b+ regulator ?
  192. Can you identify these amps?
  193. Sowter SA01 - anyone used it ?
  194. Mikael‑Abdellah‑SE‑KT88 Bias & Voltage readings Help?
  195. Resistors and combinations
  196. thr light in pcl82
  197. Bogen L330 - Worth restoring?
  198. Supro model 24 amp transformers
  199. Those Magnificent Television Tubes
  200. Demagnetizing OPT?
  201. Real DIY fun hybrid testing.
  202. Extreme hum in EQ output
  203. 46 triode-strapped DHT spice model
  204. SET output impedance vs speaker impedance
  205. Help with layout of tube preamp
  206. eico HF-65
  207. Wirewound bias pot problem.
  208. Driver for Telefunken RS242 in class A2
  209. Help on my signal generator
  210. another tube fact or fallacy
  211. Gap in Transformer Lams - OCD Check
  212. how to test...
  213. chinese tube amp
  214. tube/valve pc-80
  215. GM-70 All done
  216. Peavey 60/60 classic series schematic
  217. preamp for reciever?
  218. Designing a Tube Rectifier Circuit
  219. Bogen RP40A transformers....what to build with them?
  220. Harmony guitar amp restoration questions
  221. Heads Up for "El Cheapo" Builders
  222. replacing kt66 valves
  223. Help with power transformer identification
  224. 6-8x el84 Per channel
  225. To vary a signal pentode to triode in stages
  226. I have 2 choices for resistive load, need opinions.
  227. Tesla PCC88 7DJ8 dual triode - Help Needed.
  228. PP6550
  229. LT1083 interesting startup problem
  230. ECC33 Driver Stage
  231. Hiraga's Improved Concertina Phase Splitter
  232. 274B a direct replacement for 5AR4/GZ34?
  233. Help power up akai M8 amps
  234. Sonic Frontiers Power 3 Help!
  235. ImPasse Preamp now online
  236. Power supply for tube preamplifier with PCC88
  237. Don't know where to start...
  238. DIY noob
  239. 300B amp cathode bypass
  240. Amp hum with Preamp off
  241. First Project with these tubes
  242. 7189a socket rewiring
  243. Hybrid rectifiers in PSUD2
  244. Feedback / experience wanted on building the Audio note L4 Integrated EL34 PP Amp Kit
  245. About 6AS7BTL Amp
  246. Output Stage Protection Circuit
  247. Silly basic layout question - AC heaters
  248. heater voltage variation for special tubes
  249. Want to build a 807 Vixen.. Looking for help.
  250. Connecting Speakers to Yaqin 10L

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