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  1. Input impedance of grounded grid stage?
  2. tube upgrade benefits , worth the money ? 6R3S-1 , EF86
  3. Riaa MM high gain, low impedance.
  4. increase live 211 tube
  5. Need help with OPT for Loewe Opta Apollo Stereo
  6. Potentiometer & Power Switch Help
  7. Audio Note M2 Riaa.
  8. Is it the end of Blackburn Microtech tubes?
  9. Please critique my PSU design
  10. Audio Novice
  11. What vintage gear to source for tubes and transformers?
  12. 6n6p source
  13. (2) 6AV6 instead of 12ax7
  14. Preamp mod with tone control - comment please
  15. Roland branded 12AX7 tube?
  16. Questions about updates/upgrades
  17. When doubling output-tubes: What needs to be considered ?
  18. Audio Research SP-10 help needed
  19. Safety Tip For The Day
  20. PSU Output: Tubecad PS-1 Question
  21. Micro Channel Plate (MCP) audio amplifier
  22. bell mod 2445
  23. found a vintage dynacord concert el84 amp
  24. Stability problems, help please?
  25. Do I NEED to bring up an old amp on veriac?
  26. 6P15 / EL84 Sort of Para-Feed, Cathode-Drive, Hybrid
  27. Crosstalk L-R. Acceptable levels?
  28. Electronic diagramming tools with power and output transformer symbols
  29. Yaqin MS MC - 30L Amp
  30. www.pimmlabs.com not available
  31. vibration resistant preamp tube
  32. Direct Heated Valve in Series - Channel Separation Question
  33. So i was going into Tosche Station to pick up some power converters . . .
  34. a sub crossover idea
  35. Understanding power supply
  36. 12AX7 Class 2 (Positive Grid Voltage) Operation
  37. Edcor transformers TubeLab SPP
  38. All triode 250 watt western electric
  39. Telefunken EL34 data sheet
  40. Using a 6J1 tube amp as a final stage?
  41. Anyone use 872-A Mercury Vapor Rectifier Tube
  42. Need recapping tube radio advice
  43. Russian Capacitors
  44. Thinking about getting Philco model 14
  45. Mixed Bias for an EL34 ? Any recommendations / experience ?
  46. PP oscillation with toroid output transformer
  47. 6B4G New Amp Build Issue
  48. Mable Audio 300B Amp KitI
  49. Help me understand - 7061 vs. 12ab5 (and the rest of the 6V6 family)
  50. ebay seller jellyfishaudio
  51. DIY Tubelab SSE build keeps blowing fuses when turned on.
  52. 866a rectifier on 6.3vct@10A
  53. Vintage tube preamp design
  54. Output Transformer Wiring
  55. Ground loop problems
  56. Reversed preamp OPT as IPT
  57. A2 p-p with Millett driver
  58. DC filament supply schematic
  59. Mystery tube
  60. 6eu7/6bq5 feedback question
  61. Ultimate Ultralinear Amp...please help to understand...
  62. Mullard 20 Watt Amp
  63. Transformer feedback winding: Tamura HN-1
  64. the big one
  65. ECC33 vs 6SN7 - Implications I should know?
  66. What is a Source Measure unit (SMU)?
  67. Building a tube amp from scratch
  68. Priboj (priboi) 50, small problem (SOVIET TUBE AMP)
  69. Kellogg (Dukane?) Tube PA Amp
  70. APPJ PA1501
  71. New production 6L6GC tubes and similar
  72. Knight 10W 6V6 push-pull tube power amp
  73. 480vct at 50VA for less than $12 shipped
  74. Pioneer SA-81 integrated tube amp
  75. 12B4 Preamp Design/Pre-build Questions
  76. Can I mount a 5R4WGA at a 10 degree angle?
  77. plate current variation with fixed bias
  78. 5693 issue
  79. SPP amp build from TubeLab
  80. "mustard" Philips Mullard capacitors
  81. Hum SOLVED!!!!
  82. Garage System Control/Preamp idea
  83. Aikido Octal line stage kit info needed
  84. Phonola suitcase player...now, with hum!
  85. My latests (well ... first) RIAA preamp
  86. 12at7 one side drawers 10% more current
  87. Upgrade output transfomers, EL34 single-ended
  88. cleaning tubes / valves
  89. a simple (I think) Baxandall question
  90. Paoli Model 60M help
  91. Audio Noise Tube Tester
  92. Should something be done about these traces?
  93. 300(may)B(e) - Recs & Advice
  94. LNF in gain stage or CF?
  95. KT77 at 790 V
  96. Newb question about tube socket placement
  97. my first tube amp project
  98. Fun With Measurements
  99. Unusual Schematic help
  100. 12AX7 vs 12AT7 vs 12AU7
  101. 6SN7 Distortion Canceling in Amp
  102. D-115 w/ weak channel
  103. MOSFET Follower Choices
  104. Sanity check my unlabeled transformer guesstimates? Fisher X-200 power trafo
  105. Mystery Tube Time
  106. PSU simulation help
  107. Vacuum tubes and wire wrap
  108. LTP phase splitter as output stage?
  109. Swap 6B4G for 6SL7 SRPP ?
  110. Jean Hiraga or Tubelab SSE for KT88 SET
  111. Need Fuse Values for 6922 Tube Premp, 6.3v & B+ Fuse Value
  112. 12AX7 tone control with low B+ voltage
  113. Cathodefollower and strange behaviour with lowering of anode voltage.
  114. Early Audio Research Dual 100 Schematic?
  115. current drive
  116. Bench Supply
  117. 6X5 GT Hybrid rectifier
  118. 8417 tube test on Hickok 539a
  119. small shrouded PP OPT choices ?
  120. Single triode instead of double triode?
  121. Low noise valve tube circuit ideas for cassette deck
  122. Found a box of various 9 pin tubes....
  123. 12AU7 internally matched triodes
  124. Homemade tube socket adaptor
  125. Who's mark was on this obvious 6n23p?
  126. Thoughts on amp mods
  127. Just a quick thanks to you guys
  128. Low voltage tube line preamp
  129. What the difference between 6H7C & 6H8C tubes
  130. Headphone amp OTL
  131. Recommend design for low cost DIY valve amp
  132. need help with short
  133. Simple 1-device gyrators
  134. Need assist - Melos 110 Preamp
  135. Bad capacitor?
  136. Does someone has info about this tubes ?
  137. 2c26a
  138. Help identifying vintage tube amp connector
  139. What make is this E88CC ?
  140. Valve amp - vanishing bass
  141. 5Z3P 6N9P EL34B SE amplifier
  142. Wrapping my head around cathode followers. Does this explanation make sense?
  143. HK A500 rebuild
  144. LS7B Marantz 7 Clone PreAmp
  145. SS to drive 300b
  146. is the 12ax7 ever used on television sets?
  147. What topology was this old RCA power transformer designed for?
  148. BOM of Audio Research SP-11 MkII and D-115 MkII
  149. ECC88/6DJ8 at higher Va
  150. Valve headphone amp humming through headphones
  151. Merlin's new hi-fi valve preamp book is released
  152. Screen Drive 6BQ6GT Amp - Feasibility Study
  153. Harmon Kardon A50K project
  154. Reading high V through resistor/cap casings
  155. Troubleshooting magnavox 9302-00
  156. Vintage 1990's Audio Note 2k5 output transformer wiring color code
  157. Splitting the audio band into two transformers
  158. 21LG6/A P-P for 50+ watts?
  159. Anyone use an IEC line filter plug??
  160. pre Line 2 end Line 3
  161. NEW D3a equivalent on marked?
  162. Anyone tried Plitron transformers?
  163. Summing channels;Why? JE EL34
  164. TAJ's Harman Kardon Citation V rebuild thread
  165. Screened/shielded cables in chassis
  166. Cascode question re shunt to lower tube
  167. LED biasing in preamp - cap in parallel required?
  168. Can you identify these tube amplifiers? 4x807 & mercury vapor rectifiers
  169. Amperex BB ECC82 - Real or Fake?
  170. Max screen grid voltages in datasheets
  171. Tube rectifiers
  172. VT-25/10Y tubes
  173. Does anyone have the schematic for Transcendant Sound Mini Beast?
  174. Schematic help please
  175. Faulty rectifier valve possibly damaged my amplifier - help
  176. 6J1 tube buffer circuit diagram
  177. Filament transformer question
  178. Grundig 9060 output transformer identifying
  179. 6J1 biasing inconsistencies with datasheet
  180. Separate transformer for heaters. How to reference this to ground?
  181. 300B alternatives
  182. Stereo to Mono transformer based 'hybrid/bridging mixer'
  183. LK-48 over voltage
  184. Aikido all in one
  185. Bitsa Amp project
  186. Search for thread/article about phono preamp design
  187. Fusing valve amps
  188. AIKIDO line stage
  189. Cossor 61SPT - any experience?
  190. 6BG6GA PP, -bias, Amp built but couple problems
  191. GE 6sn7 made in Italy
  192. First SE Amp Build
  193. HV soft start
  194. Setup Question (do I really need the gain from a preamp)
  195. Your opinions please
  196. design advise
  197. Interpolation Oscillator
  198. audio note oto
  199. A small resonant HV converter: Q-Conv
  200. Iv got a 100w OPT That needs a circuit
  201. Powerful tube amp / unmatched tubes in parallel
  202. Need help: I have 807s and the guts from a HK AA-100
  203. SE EL34 and speakers
  204. 6AK10 LTP with CCS question
  205. Is a heater voltage of 6.7 cause for concern?
  206. Tube guards/cage for Elekit TU-8200
  207. ming da mc 845 aa modification
  208. How good can this headphone amp/pre amp be?
  209. Zero Bias Solution?
  210. Cathode Degeneration with CCS plate load- My Mistake
  211. Pilot 240 with too much bass-- circuit modification needed?
  212. EL34 DIY "centre-tapped" tube ??
  213. Advice for Super Cheap & Simple 829b based amp from spare parts
  214. Infineon IPA50R140CP N-channel mosfet
  215. Borberly Op amp 4 Tube Mosfet hybrid
  216. Splitting Power Supply Choke Question
  217. Toroidal PT as OPT in big power application?
  218. Inrush limiter question
  219. Counterpoint AS-5.1 Tube Type Question
  220. OPT connections
  221. Help teach a CS guy to test a tube amp!
  222. Now THIS is an output transformer
  223. Gas rectifier vs vacuum rectifier
  224. What value for the bias resistor of a SE 6550?
  225. ELL80 tube-Ultralinear mode???
  226. Russian "6L6" ID
  227. Tube amp for a car lol
  228. S5 Electronics Upgrade
  229. Best Tube for SPUD Amp
  230. Zenith 7b31 EL84 Tube Amp Low Volume
  231. Heater cathode elevation
  232. 6K5GT & EL36 AMP
  233. Grid stopper by ECC83
  234. 6L6 Without Screen Drive?
  235. Fusion Postmodernism and tube amps ---- 6SN7 + 26 45
  236. Mullard V.T.52 Push-Pull Tube AMP.
  237. Amp for Magneplaner 1,6/R
  238. Car tube amp- looking for advice
  239. Direct replacement for 5Z3PA and 5Z3P Rectifier
  240. 83 Rectifier
  241. Ground noise and hum: why and how to maybe fix it
  242. How to measure SNR?
  243. Triode vs Pentode cathode followers
  244. Damaged tubes
  245. 2W on 8Ohm OTL amplifier?
  246. EC88 dirver PL84 push-pull,DIY with a picture tells a story.
  247. DC/DC from 12V to 240V@25mA example
  248. the small SE UL ECL 86 / EY 82
  249. 1934 RCA Radio
  250. Recommendations for wiring a Red LED as a pilot lamp

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