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  1. Mystery tube
  2. 6eu7/6bq5 feedback question
  3. Ultimate Ultralinear Amp...please help to understand...
  4. Mullard 20 Watt Amp
  5. Transformer feedback winding: Tamura HN-1
  6. the big one
  7. ECC33 vs 6SN7 - Implications I should know?
  8. What is a Source Measure unit (SMU)?
  9. Building a tube amp from scratch
  10. Priboj (priboi) 50, small problem (SOVIET TUBE AMP)
  11. Kellogg (Dukane?) Tube PA Amp
  12. APPJ PA1501
  13. New production 6L6GC tubes and similar
  14. Knight 10W 6V6 push-pull tube power amp
  15. 480vct at 50VA for less than $12 shipped
  16. Pioneer SA-81 integrated tube amp
  17. 12B4 Preamp Design/Pre-build Questions
  18. Can I mount a 5R4WGA at a 10 degree angle?
  19. plate current variation with fixed bias
  20. 5693 issue
  21. SPP amp build from TubeLab
  22. "mustard" Philips Mullard capacitors
  23. Hum SOLVED!!!!
  24. Garage System Control/Preamp idea
  25. Aikido Octal line stage kit info needed
  26. Phonola suitcase player...now, with hum!
  27. My latests (well ... first) RIAA preamp
  28. 12at7 one side drawers 10% more current
  29. Upgrade output transfomers, EL34 single-ended
  30. cleaning tubes / valves
  31. a simple (I think) Baxandall question
  32. Paoli Model 60M help
  33. Audio Noise Tube Tester
  34. Should something be done about these traces?
  35. 300(may)B(e) - Recs & Advice
  36. LNF in gain stage or CF?
  37. KT77 at 790 V
  38. Newb question about tube socket placement
  39. my first tube amp project
  40. Fun With Measurements
  41. Unusual Schematic help
  42. 12AX7 vs 12AT7 vs 12AU7
  43. 6SN7 Distortion Canceling in Amp
  44. D-115 w/ weak channel
  45. MOSFET Follower Choices
  46. Sanity check my unlabeled transformer guesstimates? Fisher X-200 power trafo
  47. Mystery Tube Time
  48. PSU simulation help
  49. Vacuum tubes and wire wrap
  50. LTP phase splitter as output stage?
  51. Swap 6B4G for 6SL7 SRPP ?
  52. Jean Hiraga or Tubelab SSE for KT88 SET
  53. Need Fuse Values for 6922 Tube Premp, 6.3v & B+ Fuse Value
  54. 12AX7 tone control with low B+ voltage
  55. Cathodefollower and strange behaviour with lowering of anode voltage.
  56. Early Audio Research Dual 100 Schematic?
  57. current drive
  58. Bench Supply
  59. 6X5 GT Hybrid rectifier
  60. 8417 tube test on Hickok 539a
  61. small shrouded PP OPT choices ?
  62. Single triode instead of double triode?
  63. Low noise valve tube circuit ideas for cassette deck
  64. Found a box of various 9 pin tubes....
  65. 12AU7 internally matched triodes
  66. Homemade tube socket adaptor
  67. Who's mark was on this obvious 6n23p?
  68. Thoughts on amp mods
  69. Just a quick thanks to you guys
  70. Low voltage tube line preamp
  71. What the difference between 6H7C & 6H8C tubes
  72. Headphone amp OTL
  73. Recommend design for low cost DIY valve amp
  74. need help with short
  75. Simple 1-device gyrators
  76. Need assist - Melos 110 Preamp
  77. Bad capacitor?
  78. Does someone has info about this tubes ?
  79. 2c26a
  80. Help identifying vintage tube amp connector
  81. What make is this E88CC ?
  82. Valve amp - vanishing bass
  83. 5Z3P 6N9P EL34B SE amplifier
  84. Wrapping my head around cathode followers. Does this explanation make sense?
  85. HK A500 rebuild
  86. LS7B Marantz 7 Clone PreAmp
  87. SS to drive 300b
  88. is the 12ax7 ever used on television sets?
  89. What topology was this old RCA power transformer designed for?
  90. BOM of Audio Research SP-11 MkII and D-115 MkII
  91. ECC88/6DJ8 at higher Va
  92. Valve headphone amp humming through headphones
  93. Merlin's new hi-fi valve preamp book is released
  94. Screen Drive 6BQ6GT Amp - Feasibility Study
  95. Harmon Kardon A50K project
  96. Reading high V through resistor/cap casings
  97. Troubleshooting magnavox 9302-00
  98. Vintage 1990's Audio Note 2k5 output transformer wiring color code
  99. Splitting the audio band into two transformers
  100. 21LG6/A P-P for 50+ watts?
  101. Anyone use an IEC line filter plug??
  102. pre Line 2 end Line 3
  103. NEW D3a equivalent on marked?
  104. Anyone tried Plitron transformers?
  105. Summing channels;Why? JE EL34
  106. TAJ's Harman Kardon Citation V rebuild thread
  107. Screened/shielded cables in chassis
  108. Cascode question re shunt to lower tube
  109. LED biasing in preamp - cap in parallel required?
  110. Can you identify these tube amplifiers? 4x807 & mercury vapor rectifiers
  111. Amperex BB ECC82 - Real or Fake?
  112. Max screen grid voltages in datasheets
  113. Tube rectifiers
  114. VT-25/10Y tubes
  115. Does anyone have the schematic for Transcendant Sound Mini Beast?
  116. Schematic help please
  117. Faulty rectifier valve possibly damaged my amplifier - help
  118. 6J1 tube buffer circuit diagram
  119. Filament transformer question
  120. Grundig 9060 output transformer identifying
  121. 6J1 biasing inconsistencies with datasheet
  122. Separate transformer for heaters. How to reference this to ground?
  123. 300B alternatives
  124. Stereo to Mono transformer based 'hybrid/bridging mixer'
  125. LK-48 over voltage
  126. Aikido all in one
  127. Bitsa Amp project
  128. Search for thread/article about phono preamp design
  129. Fusing valve amps
  130. AIKIDO line stage
  131. Cossor 61SPT - any experience?
  132. 6BG6GA PP, -bias, Amp built but couple problems
  133. GE 6sn7 made in Italy
  134. First SE Amp Build
  135. HV soft start
  136. Setup Question (do I really need the gain from a preamp)
  137. Your opinions please
  138. design advise
  139. Interpolation Oscillator
  140. audio note oto
  141. A small resonant HV converter: Q-Conv
  142. Iv got a 100w OPT That needs a circuit
  143. Powerful tube amp / unmatched tubes in parallel
  144. Need help: I have 807s and the guts from a HK AA-100
  145. SE EL34 and speakers
  146. 6AK10 LTP with CCS question
  147. Is a heater voltage of 6.7 cause for concern?
  148. Tube guards/cage for Elekit TU-8200
  149. ming da mc 845 aa modification
  150. How good can this headphone amp/pre amp be?
  151. Zero Bias Solution?
  152. Cathode Degeneration with CCS plate load- My Mistake
  153. Pilot 240 with too much bass-- circuit modification needed?
  154. EL34 DIY "centre-tapped" tube ??
  155. Advice for Super Cheap & Simple 829b based amp from spare parts
  156. Infineon IPA50R140CP N-channel mosfet
  157. Borberly Op amp 4 Tube Mosfet hybrid
  158. Splitting Power Supply Choke Question
  159. Toroidal PT as OPT in big power application?
  160. Inrush limiter question
  161. Counterpoint AS-5.1 Tube Type Question
  162. OPT connections
  163. Help teach a CS guy to test a tube amp!
  164. Now THIS is an output transformer
  165. Gas rectifier vs vacuum rectifier
  166. What value for the bias resistor of a SE 6550?
  167. ELL80 tube-Ultralinear mode???
  168. Russian "6L6" ID
  169. Tube amp for a car lol
  170. S5 Electronics Upgrade
  171. Best Tube for SPUD Amp
  172. Zenith 7b31 EL84 Tube Amp Low Volume
  173. Heater cathode elevation
  174. 6K5GT & EL36 AMP
  175. Grid stopper by ECC83
  176. 6L6 Without Screen Drive?
  177. Fusion Postmodernism and tube amps ---- 6SN7 + 26 45
  178. Mullard V.T.52 Push-Pull Tube AMP.
  179. Amp for Magneplaner 1,6/R
  180. Car tube amp- looking for advice
  181. Direct replacement for 5Z3PA and 5Z3P Rectifier
  182. 83 Rectifier
  183. Ground noise and hum: why and how to maybe fix it
  184. How to measure SNR?
  185. Triode vs Pentode cathode followers
  186. Damaged tubes
  187. 2W on 8Ohm OTL amplifier?
  188. EC88 dirver PL84 push-pull,DIY with a picture tells a story.
  189. DC/DC from 12V to 240V@25mA example
  190. the small SE UL ECL 86 / EY 82
  191. 1934 RCA Radio
  192. Recommendations for wiring a Red LED as a pilot lamp
  193. Retensioning UX4 (300b) tube pin socket
  194. Looking for power transformer source - details inside
  195. High voltage delay circuit
  196. op-amp current source
  197. Conrad Johnson ART II Blow-up
  198. Help In Determining Amplifier's Output
  199. Unknown tube identification help?
  200. 6S45P HP-Amp help with tail CCS
  201. shuguang EL84 question
  202. Audioromy FU29 M828A High Pitch Squeal / Whine / Whistle
  203. Unknown ECC-83
  204. 6MN8 connected as one triode
  205. 7247 and 6GF7A in driver circuits
  206. I'm looking for a PPP with el34
  207. Output transformer measurements
  208. Volume control crackles on SET hooked to F4.
  209. EF80 push EL153, DIY with a picture tells a story.
  210. Audioromy m 828 a / 829b FU29 Bias / Balance Help
  211. The zero bias valve
  212. KT61 testing
  213. SET Stereo Amplifier
  214. Klangfilm 408a Output Transformers
  215. Too Large Grid Resistor?
  216. Sound master # 34 tube amp
  217. Echolette M40 Cap job ... now everything sucks
  218. dual coil choke
  219. looking for ML6 tubes
  220. 220V Transformer question
  221. 1 or 2 watt fire resistant metal film resistors
  222. 6GK5 SRPP
  223. Unknown Amplifier - Anyone recognise it
  224. Help me ID a tube?
  225. Triode electronics difficulties
  226. Can anyone ID this car amp trans?
  227. Multi Stage amplifier bandwidth.
  228. Chassis Question
  229. Converting Stereo SE to Parallel SE Monoblock
  230. Just got a Hickok 539B! Have questions!
  231. Can regulated B+ act like a CCS?
  232. Quad II valve matching
  233. Heater Current - per valve or per triode ?
  234. OT for 12AU7 preamp?
  235. Which James output for a Lacewood SE
  236. Help Matching RCA 5692 Tubes
  237. Yet another ECL82 se
  238. Psvane 211-TII ... Pushing them above 75W Pa
  239. Fisher X 100 A restoration questions?
  240. Brook 12A Q
  241. HT voltage for preamp circuit vs output circuit
  242. Please explain this H3 3rd harmonic cancellation
  243. Recommended speaker selector for tube amplifiers?
  244. Should I use a choke?
  245. 12DW7/7427 tube question
  246. philips 228 radiogram
  247. soft start and delay start - help please
  248. Grounding and GFCI circuits
  249. SuperTriode with BJT and MosFet - a good idea?
  250. 6AQ5/6005 12AX7 Amp

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