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  1. Aikido - calculating Rk for new tubes
  2. Steady thumping noise in preamp
  3. Leak Stereo 20 hum and buzz problem
  4. 5V AC maining for filaments
  5. Topology for Schade
  6. Thorsten 6SN7 Line stage.
  7. 12v B+ Tube buffer 12AX7
  8. 300B preamp - best operating point
  9. home made tube amp with 12v b+ how to build one?
  10. Engineer's Amp
  11. Show My Tube Headphone Amp [Add-On Modulars Design Supporting IPOD/IPHONE]
  12. FFT for adjusting tubes
  13. Music to soothe the savage tubes.
  14. Voltage divider instead of expensive volume pot or stepped attenuator.
  15. Question about Hickok 539C
  16. Long-tail pair phase splitter
  17. LM317 calculator for filament circuit
  18. Self-Biased Cathode Follower Output Point
  19. filaments power supply
  20. Power tube buffer
  21. Latching Switch Assemblies
  22. Easy Way To Reduce 251V to 235V?
  23. EL84 Push Pull 25-30 watts
  24. Exploded view of valves
  25. Infineon BSP135 depletion mode mosfet
  26. Show us you COMPACT tube amps !
  27. HV Regulator
  28. Help with my new system
  29. Anything similar to the RNT900 regulator?
  30. The 3W Hammond 125ASE output transformer
  31. Carbon Comp vs Metal Film
  32. Different brand valves
  33. Buzz In Guitar Amp
  34. quad el84 or PP el34
  35. Inexpensive wire source
  36. to MC30 or not to MC30
  37. unbypassed cathode resistor
  38. Supro Golden Holiday Schematic Needed
  39. Does this transformer work?
  40. Max grid resistance for GM70?
  41. Stacked power supply HELP!
  42. Parallel pwr supply chokes for add'l current?
  43. Need help to verify Amperex 7119's genuineness
  44. Need help/advice on a problem with console amplifier
  45. Getting started with my VERY FIRST project
  46. PCL Vintage Amp VA1956 - transformer issue
  47. Help to Identify
  48. 300B based preamp....looking for schematic
  49. USB Oscilloscope
  50. RH84SE, use as headphone amp ?
  51. The New Yaqin/Music Angel/Meng & Others Discussion Thread
  52. Power triode bias by tube rectifier
  53. Two questions on IR volume control
  54. 25 watt output tube
  55. DC heating my 300b
  56. RNT-900 regulator
  57. KT61 Equivalent - Ping Waveborne
  58. EICO 666 meter needle moves too fast/pegs too hard...help?
  59. Eico 666 meter movement speed help
  60. Running a tube without heaters
  61. SE-BAL-SE Switching
  62. What makes is stereo?
  63. Triple Checking Calcs: metering bias with mA meter
  64. EL84 & 12AX7 Amp possibilities
  65. Weird issue with tube driver.
  66. 6E5P
  67. 6B4G / 6S4S Biasing Question
  68. Quick tube wear question
  69. Looking for a tube amp
  70. Internal placing of components
  71. Preamplifiers v power amplifiers
  72. LP2 dht driver
  73. hammond 1650
  74. reverb
  75. Load For PSU
  76. *PING* Tubechimp
  77. Revamping of a Michaelson & Austin TVA-1
  78. 6V6 Behavior W/Fixed Bias (SE Amp)
  79. Low noise, low microphony, low hum valves
  80. 6L6 / 12AX7 push-pull
  81. bowei amp for audionote ax-2 speakers?
  82. Yet another Priboi thread...
  83. Help Old Radio Philips
  84. Distortion discussion from mosqueto Hybrid thread
  85. Sovtek 6N1P Microphonics
  86. ECC86 / 6GM8 Radio Receiver Help
  87. Los Angeles
  88. Op point for 6au6/6gu5 in P-G feedback 6550
  89. Tube Pre-Amp Schematic Needed
  90. find a YAQIN 5881a amplifier
  91. 11N90C in the SBCCS circuit
  92. Help replacing a PSU choke - How to choose choke
  93. does this look like a joke to you?
  94. Electronic Choke for Valve Amplifiers
  95. Sockets for a WE429A
  96. To bypass or not to bypass...
  97. DIY Curve Tracer
  98. 300B filament winding center tapped?
  99. help me decide,headphone amp - parafeed or normal tx ?
  100. 7060 vs 6AN8A
  101. Psu
  102. Blackheart amp moding question
  103. EDCOR Output transformer for 300B
  104. 80 or RGN1064 Scenario
  105. TUBENEWB - Quad KT88 Monoblocks
  106. CCS in Differential phase splitter?
  107. Need schematic for Smart 2x150vt
  108. Antek OPT
  109. 6DQ6 for audio power amp?
  110. Anyone identify this Mullard?
  111. My Mullard 5-20: some photos and a question
  112. Tube can work in low volt~~fix your knowledge
  113. A problem with a tube receiver
  114. Auto Transformer - safety advice
  115. Where I could find tube in San Jose
  116. 6Н30П spice model for MicroCap ?
  117. Transformer input and resonance
  118. GE6111 Preamplifier
  119. Where to buy audio tubes in Europe
  120. Play iPod into 1955 Record Player's Tube Amplifier
  121. To Schade it , or not..
  122. questions on input stage
  123. Planar/Lighthouse triodes for Audio?
  124. The Best coupling cap..THEL??
  125. 211 SET 40W output design and mfg.
  126. Volume Control with Loudness and no Taps
  127. Use for 4k PP (non UL) OPT's?
  128. Heathkit Oscilloscope O-12
  129. Filament Autobias
  130. Shelby NC Ham Fest
  131. 2A3 Spud
  132. Resistor as a load
  133. How to balance pushp pull DHT finals
  134. 240v to 220v
  135. Hammond 272 FX plate voltage
  136. Drawing Load Line for Parallel Output Tube
  137. question about swapping el34 for kt77 in my tube amp
  138. 6 volt recifier tubes
  139. PSU Capacitor Selection
  140. Output transformer sizing...again...
  141. Power supply cabling
  142. Voltage doubler using PSUII?
  143. Rectifier Tubes in SE Amps
  144. 6v6 SEP
  145. 1967 Pioneer SX-34, 11W, WORTH FIXING???
  146. Jumper Wire Gauge and Material for Phono Preamp?
  147. Tube libraries for AutoTRAX wanted.
  148. DIY Layout Creator for Chassis Designs
  149. ecc99 - 6C19n PP, (6S19P)
  150. Dr Z Carmen Ghia build from a Hammond Reverb amp!!
  151. Strange HF distortion
  152. have a pair of 5k:8 OPTs lying around.. suggest me something to build?
  153. Marshall 1959 (Super Tremolo) repair help
  154. Early history of High Fidelity amplifiers
  155. Which pentode for input?
  156. 6n6p or 6P14P-ev for driver
  157. Old tranny - confused with windings
  158. Dynaco A-430 Vintage Output Transformers
  159. Output tube for 800 Ohm speaker?
  160. Today was the anual Tree Street Yard Sale event
  161. Florida ? what did I get ?
  162. 26HU5's vs 26DQ5's
  163. VoltCraft AT-400?
  164. Sonic differences: 45, 2A3, 300B, 845, 211
  165. Need help wiring a pot for cathode adjustment
  166. Sound of the 6SN7?
  167. A mystery device
  168. Plate curves... Ic2 & Ib?
  169. How to choke load for big voltage swings?
  170. 6550 SE design, please comment.
  171. "Impedance" of the output transformer
  172. Triode-wired small signal pentode question
  173. Calculating output impedance
  174. 6JM6 Infomation for Pete Millett's DCPP Amp
  175. Tube labeld ETBB
  176. Heaters wiring help!
  177. What do you guys think of this IR volume control?
  178. Can you send me the Aikido 5687 user manual
  179. Cathode Follower output cap
  180. EL84 rebuild suggestions
  181. voltage divider in WE91 driver
  182. Power Tx Myth?
  183. voltage multiplier based on SS trafo - LONG
  184. What tube for QUIET phono pre??
  185. A&R 8ohm 4008 output transformer
  186. How does DRD Ultrapath Work?
  187. Russian 6H2p-E??
  188. Started work on my stereo 7027a PSE amp
  189. Mono Tube Comp for analog kick drum
  190. Line stage preamplifier
  191. Trying to select the Aikido components
  192. X-PRE musical fidelity preamp. need help modifying
  193. 6C33C & Borbely Question
  194. 12BH7A in common cathode
  195. Sneak Preview: 9 Band Active All Tube EQ
  196. Bought a set of Greenlee conduit punches for my latest project - WOW!
  197. "Universal" octal amplifier?
  198. MU follower - distortion
  199. lighting transformers 12V
  200. Chinese 6N3 preamp questions
  201. Why are Chinese preamp knockoffs so popular?
  202. 4K7 OPT suitable for 6550/KT88?
  203. Transformer question - 110 v and 25 v from 1 secondary?
  204. About loadline again, how to choose load and current
  205. Parallel Output Transformers
  206. 6SN7 / 6V6 power amp : very odd behavour
  207. HV mA Spec on Large RCA Power Xfmr?
  208. Is the Aikido too 'bright'?
  209. Has anyone put the Glassware phono & line amps in same box?
  210. High impedance balanced output: how long the cable?
  211. Data Sheets
  212. Can I use a LM317 bias on lower cathode of SRPP?
  213. AU-34 Output transformer replacement question
  214. The new KT120 from tungsol
  215. em83 questions
  216. Push-pull PCL84 schematic and a question
  217. confused on power transformer ratings
  218. C3g:GM70:GM70 schematic advice
  219. Can someone explain Load Lines?
  220. Humming from WCF but not SRPP
  221. Gas regulator tubes
  222. My B&K 707 sensitivity seems wonky
  223. Lowrey LC1 B schematic wanted
  224. Complete tube amp novice got a few questions!!
  225. jacked up the bias...WOW!
  226. Looking for PP 7027a shematic
  227. So, if it's not DIY Gene, then what?
  228. What driver tube for 200Vrms?
  229. Tube socket purchase
  230. Something I found interesting a while ago!
  231. Eico HF-22 Circuit
  232. SEDHT amp - decisions decisions
  233. Confused with designing
  234. Digitally controlled analog attenuator
  235. Purchased my 1st valve amp and can only get one channel working, please help!
  236. Another silly tube yesting question
  237. potentially very stupid questions....
  238. Tube rectifier: AZ1, AZ31, AZ50 vs 5u4
  239. Tube Square-Law, what and how to set up?
  240. Need help finding schematic. Conn 720
  241. OPT for parafeed SE
  242. Anyone else tried an opamp as a driver?
  243. e180f/6688 pentode operting points
  244. power supply reassignment problem
  245. Mains power transformer on S5 K-12 kit hums?
  246. Oriole OPT
  247. 26DQ5's vs 26HU5's vs 6KN6's and transformers
  248. SRPP power using power tranny as OPT?
  249. Need guidance with heathkit SA-2 refurbish/mods
  250. B+ discharge times!

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