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

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