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  1. ECC88 - 6DJ8 Cascode Plate Curves
  2. Gain of Phase Inverter
  3. CF/CCS, can it be made simpler?
  4. 2A3 Heater Hum Pot
  5. Need help - black out while the amp. was on
  6. simple question about cathodyne PI
  7. Where can I get a cover for the OPT and PS
  8. Power supply for heater
  9. how to use oscilloscope
  10. I am collecting parts for my 200w mono amps "But"
  11. This seems wrong?
  12. StoetKit Junior Schematics
  13. Valve Amplifiers 3rd edition Errata
  14. Anybody ever compared the Eico HF81 to Harman Kardon A220 "The Lute"?
  15. 6v6 datasheet
  16. Leaving filaments on?
  17. output caps -- your observations, pleeze
  18. Low gain preamp.
  19. Recommended Tube/Valve references?
  20. Tube Socket Identification
  21. Some agreement on reasonable affordable and well performing design builds?
  22. Fletcher cooke OTL article
  23. I have 4 Pl504's. Are they best used as SE or PP ?
  24. More k12g amp musings
  25. How preserve loudness circuit with new volume pot?
  26. Where to find 212E tubes???
  27. Music Angel XD-SE EL34 Amp
  28. CV345 VS EL34
  29. Reducing Filment Hum in Tubes
  30. push pull power amp
  31. 6 ohm speakers....
  32. Need a 12.6 VDC power supply schematic
  33. Gold Lion KT88 Issue
  34. Plate currents in P-P
  35. Testing amplifiers with computer software...
  36. Welborn Labs - Abysmal Service
  37. Repairing broken pins on valuable tube...
  38. Explain how feedback affects DF?
  39. Low emissions
  40. Tube Blue Glow question
  41. Common-mode choke before or after?
  42. 6l6 data sheet question
  43. Physical Tube Diagnosis?
  44. how and why power amps clip
  45. Vacuum Tube OTL power amp!!
  46. Tube replacement options.....
  47. balanced RIAA amp
  48. power amp distortion
  49. Suggestions for 5k5 40W iron?
  50. Schematic Tube Analog Output Stage???
  51. 300B 'direct drive' using a 6U8..
  52. Magnavox 88-02 power trans ratings?
  53. Preamp with humming noise!
  54. How to choose line out transformer?
  55. Tools for Cutting Tube Socket Holes?
  56. Switchable SE.
  57. GZ33 in place of 5U4 can it be done?
  58. phase splitter issue
  59. Armstrong A10 MK2 EL34 mono block
  60. "Ug" The Transformer
  61. i think its time i start playing with caps
  62. problems with preamp on home brew
  63. LS180 Tube Socket?
  64. simple question - 5V heater power supply
  65. Lineamp
  66. FI AUDİO 421 A
  67. Pete Millett has another Red Board for sale
  68. Jolida JD9 Problem
  69. 6N11 = 6N1P ?
  70. K12-G tube amp problem
  71. Please vote for one of the schematics.
  72. Advantages of separate PS for input and output stages
  73. Another PCB tube amp design
  74. Help. Replacement OPT sqrueeechhh.
  75. New concept of a power amp
  76. Lundahl and rectifier mismatch?
  77. Resurrecting weak tubes
  78. Best DHT heater?
  79. Help requested for EL84 SET amp
  80. What did I buy??
  81. Edcor and Custom Power Transformer Design
  82. What would you make with this power TX?
  83. Lundahl 1676
  84. DHT for 300B problem
  85. Newbie question about output transformer to speaker matching
  86. Red board add-on phono/RIAA pre-amp
  87. 2 Chassis amp
  88. Is It posible to bridge two quad II monoblocks?
  89. Power tube at work picture
  90. Tube SE power amp , which one??
  91. Hickok 539A issue
  92. Noise in one channel? Pioneer SX-400
  93. Hartung / Prestla OTL amps
  94. Lafayette Model 417
  95. Extreme plate load
  96. What do you think about this idea
  97. el84pse schem, need advice
  98. Video pentodes as outputs
  99. Chinese "Audio Research" KT88s
  100. New 6C33 Socket
  101. 2a3 PP output transformer
  102. PSU problem - Murphy is an ***hole!
  103. Best SET design?
  104. Anybody ever tried EBC41 as 12AX7 substitute?
  105. The 7242
  106. 12bh7a
  107. Phase Splitter Help
  108. Oscilloscope Question
  109. sizing opt
  110. 6P3C-E Datasheet help
  111. on the toroids again
  112. OPT problem or Something else 6L6 PP
  113. Look what I found!
  114. Help, Diy tube amp
  115. Idea
  116. a few DIY tube amplifier setups
  117. 6L6 PP amp motorboating
  118. Mayer-inspired 4P1L
  119. 6L6 WGB 2X34W STEREO AMPL
  120. Isolation transformation wiring project help
  121. Tube Amp DIY or Retail
  122. Supplier for GU50 tubes
  123. 2E26's
  124. Encel Stereophonic M.F.B CSM 40 amplifier
  125. Mono 300B SE Amplifier
  126. Broken tubes for 3D Modelling
  127. Loud hum in one channel
  128. 6EM7 PP question
  129. 12AU7/IRF610 Hybrid Amplifier
  130. RIAA preamplifier
  131. Classic amp, Chinese or scratch-build for Quad ESL?
  132. CLASS A TUBE AMPLIFIER FOR TWEETER
  133. How to gap output transformers?
  134. Cathode bypasses - partial bypass and combination bias
  135. Phase splitter
  136. YS Audio balanced Preamp
  137. Low voltage 12AU7 (19J6) -- re "starving"
  138. phase splitter
  139. Music Angel Meng 6P1
  140. Is it possible to dampen a partially microphonic 12ax7?
  141. Pioneer SA-810 tube amp.
  142. 6C33 D.C.M.B. - Paging Ari Polisois
  143. Whose is this logo?
  144. What is grid resistance of 807/6l6 in pentode
  145. PAS Upgrade Boards by Epperson
  146. Bang and Olufsen 609k stereo se el84 fm tuner
  147. Finished EL34 tube amp... but oscilates weird..
  148. Scope Trace
  149. Drifty tubes
  150. Choosing plate voltage
  151. Determining Zout for SRPP
  152. PX25 amplifier - thoughts?
  153. Testing Ck5703 tubes
  154. When can screen voltage be higher than plate???
  155. 31AL10's
  156. Lafayette TE-50 Tube Tester
  157. Acoustic (not Audio) Alchemy - I need a wizzard
  158. current feedback
  159. dac with tube buffer/preamp
  160. Sowter 3607
  161. Back to Loftin-White
  162. What to build? (I have a lot of parts)
  163. Grounding chassis through RCA
  164. K40Y-9: Questions And Comments
  165. buffer line stage schematic
  166. Dual triode Thanks for the pre-attenuation link
  167. Help With Alps Volume Pot Noise
  168. 6AM4 driving 45???
  169. Franks 6sn7 line stage question
  170. Edcor power tx XPWR035 issue
  171. Recommend me a schematic for El34 or KT88 ?
  172. RH84 Power supply
  173. Pentode driving a SE triode? any experience?
  174. Big tubes thread
  175. Meng Yayi KT88 MonoBlock
  176. Old Dumont Console - Story and Questions
  177. Newbie GlassWare Aikido All in One Questios
  178. Building my 1st tube amp
  179. A good tube for my SE 5K-8 OPT's
  180. 6c33 - ready, SET, GO
  181. Noisy tube rectifier goes quiet when i put my hand NEAR it
  182. Strange ancient looking tube amp
  183. Vintage Dynaco vs. Triode Electronics
  184. LINE PRE - 6N9S - 6dB
  185. Can I balance a diff stage like this?
  186. Ways to design for low IM distortion
  187. Genalex KT88 Plate Dissipation Question
  188. difference between SE and PP transformer
  189. I put a bad ouput tube in my amp, did I hurt it?
  190. Stereo amplifyer project
  191. 6sl7 6sl7 dynaco driver board
  192. PCB for stand alone 5W SE
  193. Triode VS. UL bias
  194. How to test a DIY amp?
  195. Morgan Jones 4th ed
  196. How close is too close when designing an amp
  197. Fatman I tube Problem
  198. 807 p-p tube amp schematic
  199. TUBELAB SIMPLE SE
  200. Listen to 6DJ8 Triode through Power Chip IC. Easy project.
  201. Cheap motor caps(MKP) vs Electrolitics
  202. James O/P Tx
  203. Ripple reduction with added voltage compensation to HV
  204. SEVETLANA "SV" 6550 C vs 6550 C
  205. Frank's 6SN7 - plate follower, noise
  206. Help running RH807 at higher voltage
  207. Preamp hum issues
  208. EML mesh plate 2a3 in DRD amp
  209. How to run RH807 at 400V?
  210. Preamp Umbilical - Use Shield as Ground Lead?
  211. Automatic Bias Control sliding bias
  212. Edcor Output Transformer Resistance
  213. Would this be worthwile restoring?
  214. Historic Tube Amplifiers
  215. 6HF5 testing
  216. A quick question about NFB
  217. PAS3 - are the tone controls really *that* bad?
  218. PP OPT in SE mode operation?
  219. Cheap 6n6p double ended push-pull idea - thoughts?
  220. Vintage WE Tubes
  221. SE amplifier advice..
  222. Mineature Tubes
  223. MD SM 102b transformer spec's please
  224. Vintage Marconi radio
  225. second order harmonics
  226. Hybrid amplifier
  227. Input caps for Motorola Console Amps
  228. to much gain
  229. Question - Type 19 tube
  230. alternative for footswitch??
  231. Noob. Help PP EL34 / EF86 both as triode schem.
  232. RH84 SE, pentode driver... advice please
  233. Having an issue with a MOSFET in my Blue Hawaii
  234. Info wanted on OPT....
  235. 6P43P Strange Plate Graphs
  236. Multiple Phono preamp
  237. pas filament supply
  238. HV on high voltage amps
  239. Lageschaar hybrid-connection PSE-KT66
  240. First DIY from scratch
  241. Ballance resistors
  242. casing about SOHA I headphone amp
  243. Any interest in 56 various tubes?
  244. Help with exploding tubes!
  245. My new filiment PS for Push Pull GM70
  246. So what exactly do I have here? Heathcraft EA-2
  247. Please help identify this Amveco toroidal transformer.
  248. first experience with retro electronics
  249. Revising a tube pre-amp: can't find parts?
  250. Info for Pioneer SA-810 tube amp

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