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  1. Self-Biased Cathode Follower Output Point
  2. filaments power supply
  3. Power tube buffer
  4. Latching Switch Assemblies
  5. Easy Way To Reduce 251V to 235V?
  6. EL84 Push Pull 25-30 watts
  7. Exploded view of valves
  8. Infineon BSP135 depletion mode mosfet
  9. Show us you COMPACT tube amps !
  10. HV Regulator
  11. Help with my new system
  12. Anything similar to the RNT900 regulator?
  13. The 3W Hammond 125ASE output transformer
  14. Carbon Comp vs Metal Film
  15. Different brand valves
  16. Buzz In Guitar Amp
  17. quad el84 or PP el34
  18. Inexpensive wire source
  19. to MC30 or not to MC30
  20. unbypassed cathode resistor
  21. Supro Golden Holiday Schematic Needed
  22. Does this transformer work?
  23. Max grid resistance for GM70?
  24. Stacked power supply HELP!
  25. Parallel pwr supply chokes for add'l current?
  26. Need help to verify Amperex 7119's genuineness
  27. Need help/advice on a problem with console amplifier
  28. Getting started with my VERY FIRST project
  29. PCL Vintage Amp VA1956 - transformer issue
  30. Help to Identify
  31. 300B based preamp....looking for schematic
  32. USB Oscilloscope
  33. RH84SE, use as headphone amp ?
  34. The New Yaqin/Music Angel/Meng & Others Discussion Thread
  35. Power triode bias by tube rectifier
  36. Two questions on IR volume control
  37. 25 watt output tube
  38. DC heating my 300b
  39. RNT-900 regulator
  40. KT61 Equivalent - Ping Waveborne
  41. EICO 666 meter needle moves too fast/pegs too hard...help?
  42. Eico 666 meter movement speed help
  43. Running a tube without heaters
  44. SE-BAL-SE Switching
  45. What makes is stereo?
  46. Triple Checking Calcs: metering bias with mA meter
  47. EL84 & 12AX7 Amp possibilities
  48. Weird issue with tube driver.
  49. 6E5P
  50. 6B4G / 6S4S Biasing Question
  51. Quick tube wear question
  52. Looking for a tube amp
  53. Internal placing of components
  54. Preamplifiers v power amplifiers
  55. LP2 dht driver
  56. hammond 1650
  57. reverb
  58. Load For PSU
  59. *PING* Tubechimp
  60. Revamping of a Michaelson & Austin TVA-1
  61. 6V6 Behavior W/Fixed Bias (SE Amp)
  62. Low noise, low microphony, low hum valves
  63. 6L6 / 12AX7 push-pull
  64. bowei amp for audionote ax-2 speakers?
  65. Yet another Priboi thread...
  66. Help Old Radio Philips
  67. Distortion discussion from mosqueto Hybrid thread
  68. Sovtek 6N1P Microphonics
  69. ECC86 / 6GM8 Radio Receiver Help
  70. Los Angeles
  71. Op point for 6au6/6gu5 in P-G feedback 6550
  72. Tube Pre-Amp Schematic Needed
  73. find a YAQIN 5881a amplifier
  74. 11N90C in the SBCCS circuit
  75. Help replacing a PSU choke - How to choose choke
  76. does this look like a joke to you?
  77. Electronic Choke for Valve Amplifiers
  78. Sockets for a WE429A
  79. To bypass or not to bypass...
  80. DIY Curve Tracer
  81. 300B filament winding center tapped?
  82. help me decide,headphone amp - parafeed or normal tx ?
  83. 7060 vs 6AN8A
  84. Psu
  85. Blackheart amp moding question
  86. EDCOR Output transformer for 300B
  87. 80 or RGN1064 Scenario
  88. TUBENEWB - Quad KT88 Monoblocks
  89. CCS in Differential phase splitter?
  90. Need schematic for Smart 2x150vt
  91. Antek OPT
  92. 6DQ6 for audio power amp?
  93. Anyone identify this Mullard?
  94. My Mullard 5-20: some photos and a question
  95. Tube can work in low volt~~fix your knowledge
  96. A problem with a tube receiver
  97. Auto Transformer - safety advice
  98. Where I could find tube in San Jose
  99. 6Н30П spice model for MicroCap ?
  100. Transformer input and resonance
  101. GE6111 Preamplifier
  102. Where to buy audio tubes in Europe
  103. Play iPod into 1955 Record Player's Tube Amplifier
  104. To Schade it , or not..
  105. questions on input stage
  106. Planar/Lighthouse triodes for Audio?
  107. The Best coupling cap..THEL??
  108. 211 SET 40W output design and mfg.
  109. Volume Control with Loudness and no Taps
  110. Use for 4k PP (non UL) OPT's?
  111. Heathkit Oscilloscope O-12
  112. Filament Autobias
  113. Shelby NC Ham Fest
  114. 2A3 Spud
  115. Resistor as a load
  116. How to balance pushp pull DHT finals
  117. 240v to 220v
  118. Hammond 272 FX plate voltage
  119. Drawing Load Line for Parallel Output Tube
  120. question about swapping el34 for kt77 in my tube amp
  121. 6 volt recifier tubes
  122. PSU Capacitor Selection
  123. Output transformer sizing...again...
  124. Power supply cabling
  125. Voltage doubler using PSUII?
  126. Rectifier Tubes in SE Amps
  127. 6v6 SEP
  128. 1967 Pioneer SX-34, 11W, WORTH FIXING???
  129. Jumper Wire Gauge and Material for Phono Preamp?
  130. Tube libraries for AutoTRAX wanted.
  131. DIY Layout Creator for Chassis Designs
  132. ecc99 - 6C19n PP, (6S19P)
  133. Dr Z Carmen Ghia build from a Hammond Reverb amp!!
  134. Strange HF distortion
  135. have a pair of 5k:8 OPTs lying around.. suggest me something to build?
  136. Marshall 1959 (Super Tremolo) repair help
  137. Early history of High Fidelity amplifiers
  138. Which pentode for input?
  139. 6n6p or 6P14P-ev for driver
  140. Old tranny - confused with windings
  141. Dynaco A-430 Vintage Output Transformers
  142. Output tube for 800 Ohm speaker?
  143. Today was the anual Tree Street Yard Sale event
  144. Florida ? what did I get ?
  145. 26HU5's vs 26DQ5's
  146. VoltCraft AT-400?
  147. Sonic differences: 45, 2A3, 300B, 845, 211
  148. Need help wiring a pot for cathode adjustment
  149. Sound of the 6SN7?
  150. A mystery device
  151. Plate curves... Ic2 & Ib?
  152. How to choke load for big voltage swings?
  153. 6550 SE design, please comment.
  154. "Impedance" of the output transformer
  155. Triode-wired small signal pentode question
  156. Calculating output impedance
  157. 6JM6 Infomation for Pete Millett's DCPP Amp
  158. Tube labeld ETBB
  159. Heaters wiring help!
  160. What do you guys think of this IR volume control?
  161. Can you send me the Aikido 5687 user manual
  162. Cathode Follower output cap
  163. EL84 rebuild suggestions
  164. voltage divider in WE91 driver
  165. Power Tx Myth?
  166. voltage multiplier based on SS trafo - LONG
  167. What tube for QUIET phono pre??
  168. A&R 8ohm 4008 output transformer
  169. How does DRD Ultrapath Work?
  170. Russian 6H2p-E??
  171. Started work on my stereo 7027a PSE amp
  172. Mono Tube Comp for analog kick drum
  173. Line stage preamplifier
  174. Trying to select the Aikido components
  175. X-PRE musical fidelity preamp. need help modifying
  176. 6C33C & Borbely Question
  177. 12BH7A in common cathode
  178. Sneak Preview: 9 Band Active All Tube EQ
  179. Bought a set of Greenlee conduit punches for my latest project - WOW!
  180. "Universal" octal amplifier?
  181. MU follower - distortion
  182. lighting transformers 12V
  183. Chinese 6N3 preamp questions
  184. Why are Chinese preamp knockoffs so popular?
  185. 4K7 OPT suitable for 6550/KT88?
  186. Transformer question - 110 v and 25 v from 1 secondary?
  187. About loadline again, how to choose load and current
  188. Parallel Output Transformers
  189. 6SN7 / 6V6 power amp : very odd behavour
  190. HV mA Spec on Large RCA Power Xfmr?
  191. Is the Aikido too 'bright'?
  192. Has anyone put the Glassware phono & line amps in same box?
  193. High impedance balanced output: how long the cable?
  194. Data Sheets
  195. Can I use a LM317 bias on lower cathode of SRPP?
  196. AU-34 Output transformer replacement question
  197. The new KT120 from tungsol
  198. em83 questions
  199. Push-pull PCL84 schematic and a question
  200. confused on power transformer ratings
  201. C3g:GM70:GM70 schematic advice
  202. Can someone explain Load Lines?
  203. Humming from WCF but not SRPP
  204. Gas regulator tubes
  205. My B&K 707 sensitivity seems wonky
  206. Lowrey LC1 B schematic wanted
  207. Complete tube amp novice got a few questions!!
  208. jacked up the bias...WOW!
  209. Looking for PP 7027a shematic
  210. So, if it's not DIY Gene, then what?
  211. What driver tube for 200Vrms?
  212. Tube socket purchase
  213. Something I found interesting a while ago!
  214. Eico HF-22 Circuit
  215. SEDHT amp - decisions decisions
  216. Confused with designing
  217. Digitally controlled analog attenuator
  218. Purchased my 1st valve amp and can only get one channel working, please help!
  219. Another silly tube yesting question
  220. potentially very stupid questions....
  221. Tube rectifier: AZ1, AZ31, AZ50 vs 5u4
  222. Tube Square-Law, what and how to set up?
  223. Need help finding schematic. Conn 720
  224. OPT for parafeed SE
  225. Anyone else tried an opamp as a driver?
  226. e180f/6688 pentode operting points
  227. power supply reassignment problem
  228. Mains power transformer on S5 K-12 kit hums?
  229. Oriole OPT
  230. 26DQ5's vs 26HU5's vs 6KN6's and transformers
  231. SRPP power using power tranny as OPT?
  232. Need guidance with heathkit SA-2 refurbish/mods
  233. B+ discharge times!
  234. 26HU5's....and a confession
  235. Bell Sound Systems Pacemaker Model 2220
  236. Any thoughts on this transformer on eBay?
  237. Need some help figuring out a Wurlitzer 6240.
  238. Bypassing cathode resistor on pp power tube
  239. Is it safe to use a 8BQ5 in place of a 6BQ5 in a guitar amp?
  240. TRIODE Voltage amp + Power OP output follower
  241. Cats and tube-a-holics
  242. Replace Tube Rectifier With Weber CC?
  243. 717a 2 stage SE amplifier
  244. Thoughts on Oatley K282 Valve Preamp?
  245. SS rectifier for SimpleSE and others...
  246. Need match Pr KT-88
  247. EL34 PP - again !!!
  248. S5 K-12 Kit sounds excellent with iPod, but relatively low volume with turntable?
  249. Finished K-12 Kit with cedar / brass chassis (pics)
  250. Groove Tube Dual 75 schematics

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