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  1. Question About High-Fidelity Magazine 195x - 196x
  2. The HEATHKIT MA-12 a MULLARD 5-10 In Disguise.
  3. who have schematic of Phenix OTL G3?
  4. CHAMP8 with ECLL800
  5. Drive requirements.....
  6. KT88 hybrid amplifier
  7. 2300 ohm vs 5000 ohm output trans question
  8. Has anyone used this regulator?
  9. Diy HiFi Supply Tram Mk2 DHT OTL Preamplifier
  10. Current mirror circuits
  11. splitter/driver stage
  12. Would someone explain this amp to me please?
  13. What am I experiencing?
  14. 6U10, 6AC10, 6D10, 6AV11
  15. My debut into the vacuum world: Yarland FV34B
  16. Resistor value tweaks for Radford STA35
  17. do you own a chinese tube integrate? does it.... smell?
  18. Needs help to find transformer
  19. 12AU7 / 12AX7 push-pull
  20. Subwoofer connection?
  21. Ultra-low Noise Valve Regulated PSU. How to?
  22. One channel has less glow
  23. 6l6 tube amp troubleshooring progress
  24. Baldwin organ transformers
  25. has anyone used a chip for an input driver to a 2A3 or the like??
  26. Good PSU for HT upt to 15mA??
  27. Edcor transformers have arrived, but really puzzled!
  28. PCL86 Tube Pre-Amp for guitar. Any Idea?
  29. Single tube, Single ended, 20W, impossible?
  30. Stan's Aikido Build
  31. Power transformer rating
  32. 7w 300b vs 350w Car audio observation (car loses)
  33. Seriously considering doing an OTL - but . .
  34. Emulating remote cut off
  35. Cheap Sakura Hybrid Tube Amp Modification
  36. screen tap on OPT
  37. Understanding Cathode Decoupling
  38. How to test interstage transformers?
  39. DIY Tube Mic
  40. Modified 6C33C
  41. Counterpoint SA-3.1 Rebuild
  42. 6V6 flare at start up
  43. Tube aging, in-circuit test?
  44. HV Regulator board
  45. What kind of top cap for 6V7G?
  46. Changing bass amp output transformer
  47. First timer wood chassis hints
  48. High voltage and heat sinks
  49. GM-70 family with top cap anode?
  50. testing 8417's on mercury 1000
  51. 6N3 Tube Preamp with DC-DC converter
  52. Question About Worn Tubes
  53. help ID 4-500 old stock tubes
  54. 6SN7 SRPP preamp
  55. Reduced Heater voltage to reduce noise
  56. ECL82 monoblock 'spud' and a question
  57. Small Tube/SS hybrid amplifier design 9V
  58. Gibson PA Amp
  59. Plate load impedance
  60. Dynaco 440 Transformer Cathode/Screen Taps 6P1P 6AQ5 UL transformer
  61. Good idle current for NOS 7868's
  62. 6N2P - WHAT THE?????????????
  63. Got an old Westinghouse radio today!!!
  64. Distinction between Driver and Output stages
  65. Need a decent chassis punch set
  66. UL P/P KT88 Class A
  67. Problem with 12ax7 phono stage
  68. LA2A parts, T4B spare
  69. Was ist das?
  70. Rset values for IXYS IXTP01N100D
  71. Dutch Book
  72. Tube amplifier chassis damping
  73. How the heck do I solve this problem????
  74. Pentode to Triode Operation
  75. AbouT the PSU II simulator & the "Cockeyed Bridge"
  76. GM70 bias & IT ratio question
  77. Transformer or choke sealed with metal case
  78. Peavy windsor tube head issue
  79. Projector 6V6 Tube Amp rats nest p2p
  80. micro pre amp
  81. Aikido - calculating Rk for new tubes
  82. Steady thumping noise in preamp
  83. Leak Stereo 20 hum and buzz problem
  84. 5V AC maining for filaments
  85. Topology for Schade
  86. Thorsten 6SN7 Line stage.
  87. 12v B+ Tube buffer 12AX7
  88. 300B preamp - best operating point
  89. home made tube amp with 12v b+ how to build one?
  90. Engineer's Amp
  91. Show My Tube Headphone Amp [Add-On Modulars Design Supporting IPOD/IPHONE]
  92. FFT for adjusting tubes
  93. Music to soothe the savage tubes.
  94. Voltage divider instead of expensive volume pot or stepped attenuator.
  95. Question about Hickok 539C
  96. Long-tail pair phase splitter
  97. LM317 calculator for filament circuit
  98. Self-Biased Cathode Follower Output Point
  99. filaments power supply
  100. Power tube buffer
  101. Latching Switch Assemblies
  102. Easy Way To Reduce 251V to 235V?
  103. EL84 Push Pull 25-30 watts
  104. Exploded view of valves
  105. Infineon BSP135 depletion mode mosfet
  106. Show us you COMPACT tube amps !
  107. HV Regulator
  108. Help with my new system
  109. Anything similar to the RNT900 regulator?
  110. The 3W Hammond 125ASE output transformer
  111. Carbon Comp vs Metal Film
  112. Different brand valves
  113. Buzz In Guitar Amp
  114. quad el84 or PP el34
  115. Inexpensive wire source
  116. to MC30 or not to MC30
  117. unbypassed cathode resistor
  118. Supro Golden Holiday Schematic Needed
  119. Does this transformer work?
  120. Max grid resistance for GM70?
  121. Stacked power supply HELP!
  122. Parallel pwr supply chokes for add'l current?
  123. Need help to verify Amperex 7119's genuineness
  124. Need help/advice on a problem with console amplifier
  125. Getting started with my VERY FIRST project
  126. PCL Vintage Amp VA1956 - transformer issue
  127. Help to Identify
  128. 300B based preamp....looking for schematic
  129. USB Oscilloscope
  130. RH84SE, use as headphone amp ?
  131. The New Yaqin/Music Angel/Meng & Others Discussion Thread
  132. Power triode bias by tube rectifier
  133. Two questions on IR volume control
  134. 25 watt output tube
  135. DC heating my 300b
  136. RNT-900 regulator
  137. KT61 Equivalent - Ping Waveborne
  138. EICO 666 meter needle moves too fast/pegs too hard...help?
  139. Eico 666 meter movement speed help
  140. Running a tube without heaters
  141. SE-BAL-SE Switching
  142. What makes is stereo?
  143. Triple Checking Calcs: metering bias with mA meter
  144. EL84 & 12AX7 Amp possibilities
  145. Weird issue with tube driver.
  146. 6E5P
  147. 6B4G / 6S4S Biasing Question
  148. Quick tube wear question
  149. Looking for a tube amp
  150. Internal placing of components
  151. Preamplifiers v power amplifiers
  152. LP2 dht driver
  153. hammond 1650
  154. reverb
  155. Load For PSU
  156. *PING* Tubechimp
  157. Revamping of a Michaelson & Austin TVA-1
  158. 6V6 Behavior W/Fixed Bias (SE Amp)
  159. Low noise, low microphony, low hum valves
  160. 6L6 / 12AX7 push-pull
  161. bowei amp for audionote ax-2 speakers?
  162. Yet another Priboi thread...
  163. Help Old Radio Philips
  164. Distortion discussion from mosqueto Hybrid thread
  165. Sovtek 6N1P Microphonics
  166. ECC86 / 6GM8 Radio Receiver Help
  167. Los Angeles
  168. Op point for 6au6/6gu5 in P-G feedback 6550
  169. Tube Pre-Amp Schematic Needed
  170. find a YAQIN 5881a amplifier
  171. 11N90C in the SBCCS circuit
  172. Help replacing a PSU choke - How to choose choke
  173. does this look like a joke to you?
  174. Electronic Choke for Valve Amplifiers
  175. Sockets for a WE429A
  176. To bypass or not to bypass...
  177. DIY Curve Tracer
  178. 300B filament winding center tapped?
  179. help me decide,headphone amp - parafeed or normal tx ?
  180. 7060 vs 6AN8A
  181. Psu
  182. Blackheart amp moding question
  183. EDCOR Output transformer for 300B
  184. 80 or RGN1064 Scenario
  185. TUBENEWB - Quad KT88 Monoblocks
  186. CCS in Differential phase splitter?
  187. Need schematic for Smart 2x150vt
  188. Antek OPT
  189. 6DQ6 for audio power amp?
  190. Anyone identify this Mullard?
  191. My Mullard 5-20: some photos and a question
  192. Tube can work in low volt~~fix your knowledge
  193. A problem with a tube receiver
  194. Auto Transformer - safety advice
  195. Where I could find tube in San Jose
  196. 6Н30П spice model for MicroCap ?
  197. Transformer input and resonance
  198. GE6111 Preamplifier
  199. Where to buy audio tubes in Europe
  200. Play iPod into 1955 Record Player's Tube Amplifier
  201. To Schade it , or not..
  202. questions on input stage
  203. Planar/Lighthouse triodes for Audio?
  204. The Best coupling cap..THEL??
  205. 211 SET 40W output design and mfg.
  206. Volume Control with Loudness and no Taps
  207. Use for 4k PP (non UL) OPT's?
  208. Heathkit Oscilloscope O-12
  209. Filament Autobias
  210. Shelby NC Ham Fest
  211. 2A3 Spud
  212. Resistor as a load
  213. How to balance pushp pull DHT finals
  214. 240v to 220v
  215. Hammond 272 FX plate voltage
  216. Drawing Load Line for Parallel Output Tube
  217. question about swapping el34 for kt77 in my tube amp
  218. 6 volt recifier tubes
  219. PSU Capacitor Selection
  220. Output transformer sizing...again...
  221. Power supply cabling
  222. Voltage doubler using PSUII?
  223. Rectifier Tubes in SE Amps
  224. 6v6 SEP
  225. 1967 Pioneer SX-34, 11W, WORTH FIXING???
  226. Jumper Wire Gauge and Material for Phono Preamp?
  227. Tube libraries for AutoTRAX wanted.
  228. DIY Layout Creator for Chassis Designs
  229. ecc99 - 6C19n PP, (6S19P)
  230. Dr Z Carmen Ghia build from a Hammond Reverb amp!!
  231. Strange HF distortion
  232. have a pair of 5k:8 OPTs lying around.. suggest me something to build?
  233. Marshall 1959 (Super Tremolo) repair help
  234. Early history of High Fidelity amplifiers
  235. Which pentode for input?
  236. 6n6p or 6P14P-ev for driver
  237. Old tranny - confused with windings
  238. Dynaco A-430 Vintage Output Transformers
  239. Output tube for 800 Ohm speaker?
  240. Today was the anual Tree Street Yard Sale event
  241. Florida ? what did I get ?
  242. 26HU5's vs 26DQ5's
  243. VoltCraft AT-400?
  244. Sonic differences: 45, 2A3, 300B, 845, 211
  245. Need help wiring a pot for cathode adjustment
  246. Sound of the 6SN7?
  247. A mystery device
  248. Plate curves... Ic2 & Ib?
  249. How to choke load for big voltage swings?
  250. 6550 SE design, please comment.

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