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  1. help ID 4-500 old stock tubes
  2. 6SN7 SRPP preamp
  3. Reduced Heater voltage to reduce noise
  4. ECL82 monoblock 'spud' and a question
  5. Small Tube/SS hybrid amplifier design 9V
  6. Plate load impedance
  7. Dynaco 440 Transformer Cathode/Screen Taps 6P1P 6AQ5 UL transformer
  8. Good idle current for NOS 7868's
  9. 6N2P - WHAT THE?????????????
  10. Got an old Westinghouse radio today!!!
  11. Distinction between Driver and Output stages
  12. Need a decent chassis punch set
  13. UL P/P KT88 Class A
  14. Problem with 12ax7 phono stage
  15. LA2A parts, T4B spare
  16. Was ist das?
  17. Rset values for IXYS IXTP01N100D
  18. Dutch Book
  19. Tube amplifier chassis damping
  20. How the heck do I solve this problem????
  21. Pentode to Triode Operation
  22. AbouT the PSU II simulator & the "Cockeyed Bridge"
  23. GM70 bias & IT ratio question
  24. Transformer or choke sealed with metal case
  25. Projector 6V6 Tube Amp rats nest p2p
  26. micro pre amp
  27. Aikido - calculating Rk for new tubes
  28. Steady thumping noise in preamp
  29. Leak Stereo 20 hum and buzz problem
  30. 5V AC maining for filaments
  31. Topology for Schade
  32. Thorsten 6SN7 Line stage.
  33. 12v B+ Tube buffer 12AX7
  34. 300B preamp - best operating point
  35. home made tube amp with 12v b+ how to build one?
  36. Engineer's Amp
  37. Show My Tube Headphone Amp [Add-On Modulars Design Supporting IPOD/IPHONE]
  38. FFT for adjusting tubes
  39. Music to soothe the savage tubes.
  40. Voltage divider instead of expensive volume pot or stepped attenuator.
  41. Question about Hickok 539C
  42. Long-tail pair phase splitter
  43. LM317 calculator for filament circuit
  44. Self-Biased Cathode Follower Output Point
  45. filaments power supply
  46. Power tube buffer
  47. Latching Switch Assemblies
  48. Easy Way To Reduce 251V to 235V?
  49. EL84 Push Pull 25-30 watts
  50. Exploded view of valves
  51. Infineon BSP135 depletion mode mosfet
  52. Show us you COMPACT tube amps !
  53. HV Regulator
  54. Help with my new system
  55. Anything similar to the RNT900 regulator?
  56. The 3W Hammond 125ASE output transformer
  57. Carbon Comp vs Metal Film
  58. Different brand valves
  59. quad el84 or PP el34
  60. Inexpensive wire source
  61. to MC30 or not to MC30
  62. unbypassed cathode resistor
  63. Does this transformer work?
  64. Max grid resistance for GM70?
  65. Stacked power supply HELP!
  66. Parallel pwr supply chokes for add'l current?
  67. Need help to verify Amperex 7119's genuineness
  68. Need help/advice on a problem with console amplifier
  69. Getting started with my VERY FIRST project
  70. PCL Vintage Amp VA1956 - transformer issue
  71. Help to Identify
  72. 300B based preamp....looking for schematic
  73. USB Oscilloscope
  74. RH84SE, use as headphone amp ?
  75. The New Yaqin/Music Angel/Meng & Others Discussion Thread
  76. Power triode bias by tube rectifier
  77. Two questions on IR volume control
  78. 25 watt output tube
  79. DC heating my 300b
  80. RNT-900 regulator
  81. KT61 Equivalent - Ping Waveborne
  82. EICO 666 meter needle moves too fast/pegs too hard...help?
  83. Eico 666 meter movement speed help
  84. Running a tube without heaters
  85. SE-BAL-SE Switching
  86. What makes is stereo?
  87. Triple Checking Calcs: metering bias with mA meter
  88. EL84 & 12AX7 Amp possibilities
  89. Weird issue with tube driver.
  90. 6E5P
  91. 6B4G / 6S4S Biasing Question
  92. Quick tube wear question
  93. Looking for a tube amp
  94. Internal placing of components
  95. Preamplifiers v power amplifiers
  96. LP2 dht driver
  97. hammond 1650
  98. Load For PSU
  99. *PING* Tubechimp
  100. Revamping of a Michaelson & Austin TVA-1
  101. 6V6 Behavior W/Fixed Bias (SE Amp)
  102. Low noise, low microphony, low hum valves
  103. 6L6 / 12AX7 push-pull
  104. bowei amp for audionote ax-2 speakers?
  105. Yet another Priboi thread...
  106. Help Old Radio Philips
  107. Distortion discussion from mosqueto Hybrid thread
  108. Sovtek 6N1P Microphonics
  109. ECC86 / 6GM8 Radio Receiver Help
  110. Los Angeles
  111. Op point for 6au6/6gu5 in P-G feedback 6550
  112. Tube Pre-Amp Schematic Needed
  113. find a YAQIN 5881a amplifier
  114. 11N90C in the SBCCS circuit
  115. Help replacing a PSU choke - How to choose choke
  116. does this look like a joke to you?
  117. Electronic Choke for Valve Amplifiers
  118. Sockets for a WE429A
  119. To bypass or not to bypass...
  120. DIY Curve Tracer
  121. 300B filament winding center tapped?
  122. help me decide,headphone amp - parafeed or normal tx ?
  123. 7060 vs 6AN8A
  124. Psu
  125. EDCOR Output transformer for 300B
  126. 80 or RGN1064 Scenario
  127. TUBENEWB - Quad KT88 Monoblocks
  128. CCS in Differential phase splitter?
  129. Need schematic for Smart 2x150vt
  130. Antek OPT
  131. 6DQ6 for audio power amp?
  132. Anyone identify this Mullard?
  133. My Mullard 5-20: some photos and a question
  134. Tube can work in low volt~~fix your knowledge
  135. A problem with a tube receiver
  136. Auto Transformer - safety advice
  137. Where I could find tube in San Jose
  138. 6Н30П spice model for MicroCap ?
  139. Transformer input and resonance
  140. GE6111 Preamplifier
  141. Where to buy audio tubes in Europe
  142. Play iPod into 1955 Record Player's Tube Amplifier
  143. To Schade it , or not..
  144. questions on input stage
  145. Planar/Lighthouse triodes for Audio?
  146. The Best coupling cap..THEL??
  147. 211 SET 40W output design and mfg.
  148. Volume Control with Loudness and no Taps
  149. Use for 4k PP (non UL) OPT's?
  150. Heathkit Oscilloscope O-12
  151. Filament Autobias
  152. Shelby NC Ham Fest
  153. 2A3 Spud
  154. Resistor as a load
  155. How to balance pushp pull DHT finals
  156. 240v to 220v
  157. Hammond 272 FX plate voltage
  158. Drawing Load Line for Parallel Output Tube
  159. question about swapping el34 for kt77 in my tube amp
  160. 6 volt recifier tubes
  161. Output transformer sizing...again...
  162. Power supply cabling
  163. Voltage doubler using PSUII?
  164. Rectifier Tubes in SE Amps
  165. 6v6 SEP
  166. 1967 Pioneer SX-34, 11W, WORTH FIXING???
  167. Jumper Wire Gauge and Material for Phono Preamp?
  168. Tube libraries for AutoTRAX wanted.
  169. DIY Layout Creator for Chassis Designs
  170. ecc99 - 6C19n PP, (6S19P)
  171. Strange HF distortion
  172. have a pair of 5k:8 OPTs lying around.. suggest me something to build?
  173. Early history of High Fidelity amplifiers
  174. Which pentode for input?
  175. 6n6p or 6P14P-ev for driver
  176. Old tranny - confused with windings
  177. Dynaco A-430 Vintage Output Transformers
  178. Output tube for 800 Ohm speaker?
  179. Today was the anual Tree Street Yard Sale event
  180. Florida ? what did I get ?
  181. 26HU5's vs 26DQ5's
  182. VoltCraft AT-400?
  183. Sonic differences: 45, 2A3, 300B, 845, 211
  184. Need help wiring a pot for cathode adjustment
  185. Sound of the 6SN7?
  186. A mystery device
  187. Plate curves... Ic2 & Ib?
  188. How to choke load for big voltage swings?
  189. 6550 SE design, please comment.
  190. "Impedance" of the output transformer
  191. Triode-wired small signal pentode question
  192. Calculating output impedance
  193. 6JM6 Infomation for Pete Millett's DCPP Amp
  194. Tube labeld ETBB
  195. Heaters wiring help!
  196. What do you guys think of this IR volume control?
  197. Can you send me the Aikido 5687 user manual
  198. Cathode Follower output cap
  199. EL84 rebuild suggestions
  200. voltage divider in WE91 driver
  201. Power Tx Myth?
  202. voltage multiplier based on SS trafo - LONG
  203. What tube for QUIET phono pre??
  204. A&R 8ohm 4008 output transformer
  205. How does DRD Ultrapath Work?
  206. Russian 6H2p-E??
  207. Started work on my stereo 7027a PSE amp
  208. Mono Tube Comp for analog kick drum
  209. Line stage preamplifier
  210. Trying to select the Aikido components
  211. X-PRE musical fidelity preamp. need help modifying
  212. 6C33C & Borbely Question
  213. 12BH7A in common cathode
  214. Sneak Preview: 9 Band Active All Tube EQ
  215. Bought a set of Greenlee conduit punches for my latest project - WOW!
  216. "Universal" octal amplifier?
  217. MU follower - distortion
  218. lighting transformers 12V
  219. Chinese 6N3 preamp questions
  220. Why are Chinese preamp knockoffs so popular?
  221. 4K7 OPT suitable for 6550/KT88?
  222. Transformer question - 110 v and 25 v from 1 secondary?
  223. About loadline again, how to choose load and current
  224. Parallel Output Transformers
  225. 6SN7 / 6V6 power amp : very odd behavour
  226. HV mA Spec on Large RCA Power Xfmr?
  227. Is the Aikido too 'bright'?
  228. Has anyone put the Glassware phono & line amps in same box?
  229. High impedance balanced output: how long the cable?
  230. Data Sheets
  231. Can I use a LM317 bias on lower cathode of SRPP?
  232. AU-34 Output transformer replacement question
  233. The new KT120 from tungsol
  234. em83 questions
  235. Push-pull PCL84 schematic and a question
  236. confused on power transformer ratings
  237. C3g:GM70:GM70 schematic advice
  238. Can someone explain Load Lines?
  239. Humming from WCF but not SRPP
  240. Gas regulator tubes
  241. My B&K 707 sensitivity seems wonky
  242. Lowrey LC1 B schematic wanted
  243. Complete tube amp novice got a few questions!!
  244. jacked up the bias...WOW!
  245. Looking for PP 7027a shematic
  246. So, if it's not DIY Gene, then what?
  247. What driver tube for 200Vrms?
  248. Tube socket purchase
  249. Something I found interesting a while ago!
  250. Eico HF-22 Circuit

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