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  1. Direct Coupled, Self Biasing, CCS Loaded, 300B Amp
  2. Testing a 300A on a B&K
  3. Diodes to tube
  4. PL84/EL86 push pull
  5. circuit diagram
  6. Ultralinear operation
  7. 60hz hum in component system
  8. Crackling Amp
  9. Explanation wanted
  10. Dynaco FM1 stereo updating ?
  11. tube amp diy off. Is this a good deal?
  12. SE driver
  13. DN2540 + LM317 cascode CCS?
  14. Recapping old tube amp
  15. How a SRPP stage sounds like?
  16. Help troubleshooting SE Pentode amp
  17. What meter for Bias?
  18. got a custom 829b amp that i got laying around, need to know what driver to use
  19. Universal filament regulator
  20. ECC88 - 6DJ8 Cascode Plate Curves
  21. Gain of Phase Inverter
  22. CF/CCS, can it be made simpler?
  23. 2A3 Heater Hum Pot
  24. Need help - black out while the amp. was on
  25. simple question about cathodyne PI
  26. Where can I get a cover for the OPT and PS
  27. I am collecting parts for my 200w mono amps "But"
  28. This seems wrong?
  29. StoetKit Junior Schematics
  30. Valve Amplifiers 3rd edition Errata
  31. Anybody ever compared the Eico HF81 to Harman Kardon A220 "The Lute"?
  32. 6v6 datasheet
  33. Leaving filaments on?
  34. output caps -- your observations, pleeze
  35. Low gain preamp.
  36. Recommended Tube/Valve references?
  37. Tube Socket Identification
  38. Some agreement on reasonable affordable and well performing design builds?
  39. Fletcher cooke OTL article
  40. I have 4 Pl504's. Are they best used as SE or PP ?
  41. More k12g amp musings
  42. How preserve loudness circuit with new volume pot?
  43. Where to find 212E tubes???
  44. Music Angel XD-SE EL34 Amp
  45. CV345 VS EL34
  46. Reducing Filment Hum in Tubes
  47. push pull power amp
  48. 6 ohm speakers....
  49. Gold Lion KT88 Issue
  50. Plate currents in P-P
  51. Testing amplifiers with computer software...
  52. Welborn Labs - Abysmal Service
  53. Repairing broken pins on valuable tube...
  54. Explain how feedback affects DF?
  55. Low emissions
  56. Tube Blue Glow question
  57. 6l6 data sheet question
  58. Physical Tube Diagnosis?
  59. how and why power amps clip
  60. Vacuum Tube OTL power amp!!
  61. Tube replacement options.....
  62. balanced RIAA amp
  63. power amp distortion
  64. Suggestions for 5k5 40W iron?
  65. Schematic Tube Analog Output Stage???
  66. 300B 'direct drive' using a 6U8..
  67. Magnavox 88-02 power trans ratings?
  68. Preamp with humming noise!
  69. How to choose line out transformer?
  70. Tools for Cutting Tube Socket Holes?
  71. Switchable SE.
  72. GZ33 in place of 5U4 can it be done?
  73. phase splitter issue
  74. Armstrong A10 MK2 EL34 mono block
  75. "Ug" The Transformer
  76. problems with preamp on home brew
  77. LS180 Tube Socket?
  78. simple question - 5V heater power supply
  79. Lineamp
  80. FI AUDİO 421 A
  81. Pete Millett has another Red Board for sale
  82. Jolida JD9 Problem
  83. 6N11 = 6N1P ?
  84. K12-G tube amp problem
  85. Please vote for one of the schematics.
  86. Advantages of separate PS for input and output stages
  87. Another PCB tube amp design
  88. Help. Replacement OPT sqrueeechhh.
  89. New concept of a power amp
  90. Resurrecting weak tubes
  91. Best DHT heater?
  92. Help requested for EL84 SET amp
  93. What did I buy??
  94. Edcor and Custom Power Transformer Design
  95. What would you make with this power TX?
  96. Lundahl 1676
  97. DHT for 300B problem
  98. Newbie question about output transformer to speaker matching
  99. Red board add-on phono/RIAA pre-amp
  100. 2 Chassis amp
  101. Is It posible to bridge two quad II monoblocks?
  102. Power tube at work picture
  103. Tube SE power amp , which one??
  104. Noise in one channel? Pioneer SX-400
  105. Hartung / Prestla OTL amps
  106. Lafayette Model 417
  107. Extreme plate load
  108. What do you think about this idea
  109. el84pse schem, need advice
  110. Video pentodes as outputs
  111. Chinese "Audio Research" KT88s
  112. New 6C33 Socket
  113. 2a3 PP output transformer
  114. Best SET design?
  115. Anybody ever tried EBC41 as 12AX7 substitute?
  116. The 7242
  117. 12bh7a
  118. Phase Splitter Help
  119. Oscilloscope Question
  120. sizing opt
  121. 6P3C-E Datasheet help
  122. on the toroids again
  123. OPT problem or Something else 6L6 PP
  124. Look what I found!
  125. Help, Diy tube amp
  126. Idea
  127. a few DIY tube amplifier setups
  128. 6L6 PP amp motorboating
  129. Mayer-inspired 4P1L
  130. 6L6 WGB 2X34W STEREO AMPL
  131. Tube Amp DIY or Retail
  132. Supplier for GU50 tubes
  133. 2E26's
  134. Encel Stereophonic M.F.B CSM 40 amplifier
  135. Mono 300B SE Amplifier
  136. Broken tubes for 3D Modelling
  137. Loud hum in one channel
  138. 6EM7 PP question
  139. 12AU7/IRF610 Hybrid Amplifier
  140. RIAA preamplifier
  141. Classic amp, Chinese or scratch-build for Quad ESL?
  142. CLASS A TUBE AMPLIFIER FOR TWEETER
  143. How to gap output transformers?
  144. Cathode bypasses - partial bypass and combination bias
  145. Phase splitter
  146. YS Audio balanced Preamp
  147. Low voltage 12AU7 (19J6) -- re "starving"
  148. phase splitter
  149. Music Angel Meng 6P1
  150. Is it possible to dampen a partially microphonic 12ax7?
  151. Pioneer SA-810 tube amp.
  152. 6C33 D.C.M.B. - Paging Ari Polisois
  153. Whose is this logo?
  154. What is grid resistance of 807/6l6 in pentode
  155. PAS Upgrade Boards by Epperson
  156. Bang and Olufsen 609k stereo se el84 fm tuner
  157. Finished EL34 tube amp... but oscilates weird..
  158. Scope Trace
  159. Drifty tubes
  160. Choosing plate voltage
  161. Determining Zout for SRPP
  162. PX25 amplifier - thoughts?
  163. Testing Ck5703 tubes
  164. When can screen voltage be higher than plate???
  165. 31AL10's
  166. Acoustic (not Audio) Alchemy - I need a wizzard
  167. current feedback
  168. dac with tube buffer/preamp
  169. Sowter 3607
  170. Back to Loftin-White
  171. What to build? (I have a lot of parts)
  172. Grounding chassis through RCA
  173. K40Y-9: Questions And Comments
  174. buffer line stage schematic
  175. Dual triode Thanks for the pre-attenuation link
  176. Help With Alps Volume Pot Noise
  177. 6AM4 driving 45???
  178. Franks 6sn7 line stage question
  179. Recommend me a schematic for El34 or KT88 ?
  180. RH84 Power supply
  181. Pentode driving a SE triode? any experience?
  182. Big tubes thread
  183. Meng Yayi KT88 MonoBlock
  184. Old Dumont Console - Story and Questions
  185. Newbie GlassWare Aikido All in One Questios
  186. Building my 1st tube amp
  187. A good tube for my SE 5K-8 OPT's
  188. 6c33 - ready, SET, GO
  189. Noisy tube rectifier goes quiet when i put my hand NEAR it
  190. Strange ancient looking tube amp
  191. Vintage Dynaco vs. Triode Electronics
  192. LINE PRE - 6N9S - 6dB
  193. Can I balance a diff stage like this?
  194. Ways to design for low IM distortion
  195. Genalex KT88 Plate Dissipation Question
  196. difference between SE and PP transformer
  197. I put a bad ouput tube in my amp, did I hurt it?
  198. Stereo amplifyer project
  199. 6sl7 6sl7 dynaco driver board
  200. PCB for stand alone 5W SE
  201. Triode VS. UL bias
  202. How to test a DIY amp?
  203. Morgan Jones 4th ed
  204. How close is too close when designing an amp
  205. Fatman I tube Problem
  206. 807 p-p tube amp schematic
  207. Listen to 6DJ8 Triode through Power Chip IC. Easy project.
  208. James O/P Tx
  209. Ripple reduction with added voltage compensation to HV
  210. SEVETLANA "SV" 6550 C vs 6550 C
  211. Frank's 6SN7 - plate follower, noise
  212. Help running RH807 at higher voltage
  213. Preamp hum issues
  214. EML mesh plate 2a3 in DRD amp
  215. How to run RH807 at 400V?
  216. Preamp Umbilical - Use Shield as Ground Lead?
  217. Automatic Bias Control sliding bias
  218. Edcor Output Transformer Resistance
  219. Would this be worthwile restoring?
  220. Historic Tube Amplifiers
  221. 6HF5 testing
  222. A quick question about NFB
  223. PAS3 - are the tone controls really *that* bad?
  224. PP OPT in SE mode operation?
  225. Cheap 6n6p double ended push-pull idea - thoughts?
  226. Vintage WE Tubes
  227. SE amplifier advice..
  228. Miniature Tubes
  229. MD SM 102b transformer spec's please
  230. Vintage Marconi radio
  231. second order harmonics
  232. Hybrid amplifier
  233. Input caps for Motorola Console Amps
  234. Too much gain
  235. Question - Type 19 tube
  236. Noob. Help PP EL34 / EF86 both as triode schem.
  237. RH84 SE, pentode driver... advice please
  238. Having an issue with a MOSFET in my Blue Hawaii
  239. Info wanted on OPT....
  240. 6P43P Strange Plate Graphs
  241. Multiple Phono preamp
  242. pas filament supply
  243. HV on high voltage amps
  244. Lageschaar hybrid-connection PSE-KT66
  245. First DIY from scratch
  246. Ballance resistors
  247. Any interest in 56 various tubes?
  248. Help with exploding tubes!
  249. My new filiment PS for Push Pull GM70
  250. So what exactly do I have here? Heathcraft EA-2

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