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  1. Need help in modifying Roberts 770 monoblocks
  2. PP and PPP
  3. ECL82 Single Tube Amp
  4. circuit idea
  5. Need Telefunken Hymnus 5438 Dial Glass
  6. Bias probes/Am I getting true readings
  7. How to measure output power
  8. Oddblock Wooden Case
  9. Amplifier Quandary
  10. Fuse blows instantly
  11. Looking for a fairly simple Hi gain tube pre amp project
  12. Best 2a3 PP OPT.
  13. Sharing cathode resistor and capacitor
  14. Power tubes in cascode for output section?
  15. good tube service tech in Los Angeles?
  16. Proposal for a new sticky thread
  17. The History of the EL-34 and other Pentodes and Beam Tetrodes.
  18. PCF what?
  19. stupid question about heater wire to ground
  20. OTL All American Five? (or Ten)
  21. Scored a very nice H H Scott 272!
  22. Simple DIY Stereo Tube Amp with around 20W
  23. Maton Amp
  24. New Tech
  25. LS8 pre kit as an output stage for DAC?
  26. Japanese Valves
  27. B+ delay for DHT amp
  28. QQV03-20A/CV2799
  29. 0,22 0,33 0,47.....uF
  30. Most powerful SE DIY design?
  31. 420vdc supply for a tube amp
  32. PSE 2a3 operating points?
  33. Ju-Jutsu: The Ultimate Monoblock
  34. Looking for Phono Stage ...
  35. Finished my Fisher 460t-thanks
  36. Datasheet Cpk values
  37. Eico635 tester
  38. 6p3s...
  39. Help with Amp Salvage
  40. 808 SE Build
  41. how to bias my rebuilt dynaco st 70
  42. Want help - RCA Tube Manual RIAA Phono Stage
  43. Tube Pre-amp for both CD and Phono inputs
  44. Cascode Driver Oscillation
  45. 872b or 6gj5a for a homebrew bass amp
  46. how does it sound and perform?
  47. Bootstrapped long tail
  48. Thorens TEM 3200 clone
  49. Identifying this RCA Transformer
  50. Tube burning
  51. Add Standby Directly after Rectifier, or After First Filter Stage?
  52. Help with some tube ID
  53. CCS power amp bias
  54. this is EL34 tube of what model?
  55. Looking for constructive criticism on my first design
  56. Audio note kit 1 vs Meishu
  57. Tube Amp Gain V.S. RF Gain
  58. Kool-mu material for building audio transformer
  59. Buzz/Hum in Matrix amplifier
  60. Optimation PA-250AC Lab-Grade Audio Amplifier
  61. RS1003 in SE triode-UL monoblocks
  62. Bypass capacitors in Tube amps
  63. Basic question re: gNFB around 3 stages
  64. James PP Audio Transformers, any good?
  65. Seeking advice for tube amp kit on,seems to be, chinese site
  66. Tube pricing from 1981
  67. 6e5p WCF headphone amp with no cap!
  68. "How it's made" vacuum tubes..
  69. Citation I and IV phono schematic query
  70. GS-4V High-mu russian triode for RIAA preamp
  71. good source for amp chassis in europe?
  72. Help identify and replacement of ? resistor
  73. New tube amp diy kit required power?
  74. Decoupling DC heater supply between valves..benefit?
  75. The Aikido Comedy: Straight Talk
  76. Recapping tube preamp questions
  77. A tube amp that's actually a tesla coil.
  78. Tube "Orientation"
  79. 18 watt tremolo vvr
  80. Pre amp output, would this work?
  81. Aikido Power Amp.....Possible??
  82. 12AX7 questions
  83. 6550 PUSH-PULL
  84. CCS at plate? Unknown schematic part
  85. Most odd grid choke behaviour.
  86. Spec for Altec TP-404 Transformer
  87. why do wimpy drivers for 2A3 work as well as they do?
  88. Seeking advice on Tube buffer / pre-amp
  89. 8x Push-pull KT88 class A in triode mode
  90. Tube Pre dull into Tube Amp - cause ?
  91. FINALLY I can start building my GM70
  92. Russian triodes ГИ-15Б arriving in a few days
  93. Cap or resistor
  94. KT88/PP driver confusion
  95. Simple SE GU-50
  96. Darling 1626
  97. 01a DHT Preamp
  98. Suitable tubes for Gomes output
  99. phono line stage project
  100. Whats wrong with this circuit?
  101. Any Newcomb Gurus.?
  102. Preamp Tube MU Level?
  103. SRPP Paraccordion topology ?
  104. Replacing 6922 with 6FQ7 in Conrad Johnson ET3 preamp
  105. Modification of a Chinese KT90 PP amplifier
  106. Tricky Headphone Amp design for AK4396
  107. How to know voltage bias adjustmentwith this data?
  108. Strange Stability Enhancement Trick
  109. has anyone bought tubes from http://www.tangotubes.com/
  110. “Earmax / G3 / Morgan Jones / Cavalli” Headphone Amp Reissue with 6SN7 Steroids
  111. Ever heard of British transofmer company "Ro"?
  112. A friend gave me some random tubes...
  113. Replacement for 6e2 without vu
  114. PP GU50 triode strapped project
  115. Tube VAS stage questions???
  116. OT impedance help: 9.8 vs 8k
  117. popping & crackling noise from restored valve AM radio
  118. Choosing 6550 PP Output Transformer
  119. Reversing Interstage Transformer
  120. Aikido 9 pin All in One Build
  121. KT88 PP UL Design Help Needed
  122. Cayin A-300B schematic needed
  123. Please Recommend a Preamp!
  124. Which Antek transforms to use
  125. Integrated Amp as Preamp and Subwoofer amp
  126. Uses for 715C Pulse Tetrode
  127. PP KT-88 w/866A MV HT Supply
  128. EC88 (6DL4) NOS Mullard - any use at all?
  129. Advice sought on thermionic headphone amp
  130. Eico HF-81: Input Selector bypass
  131. 12b4 bass rolloff problem
  132. No Right ch sound on yaqin mc10l
  133. tester causing bias to rise?
  134. Heaters & Filaments: AC vs. DC
  135. Old HP power transformers... need some wiring advice!
  136. Old HP power transformers... need some wiring advice!
  137. RCA RS177H just dosen't sound right! Caps?
  138. silicon or tube rectifier in an EL34 SE
  139. Help original 300G LEGACY
  140. 813 Tube-Steak!
  141. Basic 12AU7 heatrr question
  142. Shipping a vacuum tube to China
  143. 6DJ8/ECC88-SRPP Tube Preamplifier
  144. Help needed: hum noise in Eimac 250TL driven by 75TL Single End Amplifier
  145. Found tons of Tubes,and many other parts
  146. Ampeg B15 Heritage Clone Help
  147. EZ80 Data Sheets, R-Lim and Max Cap
  148. Filament Voltages CT vs Non-CT
  149. Troubleshooting help needed
  150. What is it? Tube guessology
  151. Bass & Treble controls, or rather lack of.
  152. Quicksilver 8417 Power Supply Question
  153. Why a sudden distortion in treble of this SET amplifier?
  154. 5f1 Champ grounding
  155. Antitriode PP with EL34
  156. How to calculate Pout for Push Pull design
  157. Newbie Question - Power Transformer vs Isolation Transformer
  158. All tubes red plating
  159. Exceeding bias voltage?
  160. Vacuum State RTP Preamp Problem
  161. Alfred Morgan Tube Preamplifier
  162. 845 vs GM70
  163. Looking for project suggestions - 12au7 pre-amp?
  164. Contemporary tradition breaking amp schematics.
  165. ul - triode coupled screen grid resistor
  166. Optimum driver valve for an interstage-transformer-driven SE 300B
  167. 6C33C
  168. Soundcraftsmen 5050
  169. Tetra Phono Question
  170. WF tube
  171. Opt laminations isolation
  172. Heretical Source
  173. Broskie auto bias
  174. heater wiring - the Good the Bad and the Ugly
  175. AC Line Filter
  176. Counterpoint SA5000 Help
  177. Problem with ECC83 measurement values - please help
  178. Newbie Bias help ?
  179. AV305m AVVT
  180. Pot mechanical resistance and restoration..
  181. HMV Little Nipper mantle radio = 1 STEREO
  182. What's the simplest way to adjust filament voltage?
  183. GDAP-06
  184. Audio Note L6 - Schematic?
  185. Preventing HV flashover on socket pins
  186. Best "Vintage" Stereo Pres that SoftClip and lotsa Harmonics
  187. SE with PP OPT's?
  188. 12ax7/12AT7 Recommendations
  189. HELP: Eimac 75TL amp high frequency roll off
  190. unison reserch s8, let's build it!
  191. Where do super high end companies get their transformers?
  192. Tube Tester Panel Meter
  193. Attic find AMP
  194. Help getting Imax and Eb approximations for a push-pull amp
  195. Is this amp OK to buy, or is this a problem?
  196. Swirling Harmonics, can it be described
  197. Line stage with u-follower and nfb
  198. Newbie looking for help, pre-out to tube amp.
  199. Unison research integrated ampliphier schematics
  200. FET CCS anode load and RFI/oscillation.
  201. Old schematic
  202. Newbie Looking for Replacement OPTS Motorola Console Amp
  203. Merlyn- May AudioXpress
  204. How to clean tubes?
  205. does the 3A5 have the stones to drive a 2A3?
  206. New amp: 13DE7 SE hybrid
  207. My amp is motorboating, improve it with b+ regulator ?
  208. Can you identify these amps?
  209. Sowter SA01 - anyone used it ?
  210. Mikael‑Abdellah‑SE‑KT88 Bias & Voltage readings Help?
  211. Resistors and combinations
  212. thr light in pcl82
  213. Bogen L330 - Worth restoring?
  214. Supro model 24 amp transformers
  215. Those Magnificent Television Tubes
  216. Demagnetizing OPT?
  217. Real DIY fun hybrid testing.
  218. Extreme hum in EQ output
  219. 46 triode-strapped DHT spice model
  220. SET output impedance vs speaker impedance
  221. Help with layout of tube preamp
  222. eico HF-65
  223. Wirewound bias pot problem.
  224. Driver for Telefunken RS242 in class A2
  225. Help on my signal generator
  226. another tube fact or fallacy
  227. Gap in Transformer Lams - OCD Check
  228. how to test...
  229. chinese tube amp
  230. tube/valve pc-80
  231. GM-70 All done
  232. Peavey 60/60 classic series schematic
  233. preamp for reciever?
  234. Designing a Tube Rectifier Circuit
  235. Bogen RP40A transformers....what to build with them?
  236. Harmony guitar amp restoration questions
  237. Heads Up for "El Cheapo" Builders
  238. replacing kt66 valves
  239. Help with power transformer identification
  240. 6-8x el84 Per channel
  241. To vary a signal pentode to triode in stages
  242. I have 2 choices for resistive load, need opinions.
  243. Tesla PCC88 7DJ8 dual triode - Help Needed.
  244. PP6550
  245. LT1083 interesting startup problem
  246. ECC33 Driver Stage
  247. Hiraga's Improved Concertina Phase Splitter
  248. 274B a direct replacement for 5AR4/GZ34?
  249. Help power up akai M8 amps
  250. Sonic Frontiers Power 3 Help!

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