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  1. CF/CCS, can it be made simpler?
  2. 2A3 Heater Hum Pot
  3. Need help - black out while the amp. was on
  4. simple question about cathodyne PI
  5. Where can I get a cover for the OPT and PS
  6. Power supply for heater
  7. how to use oscilloscope
  8. I am collecting parts for my 200w mono amps "But"
  9. This seems wrong?
  10. StoetKit Junior Schematics
  11. Valve Amplifiers 3rd edition Errata
  12. Anybody ever compared the Eico HF81 to Harman Kardon A220 "The Lute"?
  13. 6v6 datasheet
  14. Leaving filaments on?
  15. output caps -- your observations, pleeze
  16. Low gain preamp.
  17. Recommended Tube/Valve references?
  18. Stand Alone guitar power amp
  19. Tube Socket Identification
  20. Some agreement on reasonable affordable and well performing design builds?
  21. Fletcher cooke OTL article
  22. I have 4 Pl504's. Are they best used as SE or PP ?
  23. More k12g amp musings
  24. How preserve loudness circuit with new volume pot?
  25. Where to find 212E tubes???
  26. Music Angel XD-SE EL34 Amp
  27. CV345 VS EL34
  28. Reducing Filment Hum in Tubes
  29. push pull power amp
  30. 6 ohm speakers....
  31. Need a 12.6 VDC power supply schematic
  32. Gold Lion KT88 Issue
  33. Plate currents in P-P
  34. Bass preamp + Edcor balanced out = HUM!
  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. Mic preamp
  44. Physical Tube Diagnosis?
  45. how and why power amps clip
  46. 80's Guitar Amp...replacing o/p tubes...which 6L6 should i try?
  47. Vacuum Tube OTL power amp!!
  48. Tube replacement options.....
  49. balanced RIAA amp
  50. power amp distortion
  51. Suggestions for 5k5 40W iron?
  52. Peavey Classic 30 Reverb headscratcher...
  53. Schematic Tube Analog Output Stage???
  54. 300B 'direct drive' using a 6U8..
  55. Magnavox 88-02 power trans ratings?
  56. Preamp with humming noise!
  57. How to choose line out transformer?
  58. Tools for Cutting Tube Socket Holes?
  59. Switchable SE.
  60. GZ33 in place of 5U4 can it be done?
  61. phase splitter issue
  62. Armstrong A10 MK2 EL34 mono block
  63. "Ug" The Transformer
  64. i think its time i start playing with caps
  65. problems with preamp on home brew
  66. LS180 Tube Socket?
  67. simple question - 5V heater power supply
  68. Lineamp
  69. FI AUDİO 421 A
  70. Pete Millett has another Red Board for sale
  71. Jolida JD9 Problem
  72. 6N11 = 6N1P ?
  73. K12-G tube amp problem
  74. Please vote for one of the schematics.
  75. Advantages of separate PS for input and output stages
  76. Another PCB tube amp design
  77. Help. Replacement OPT sqrueeechhh.
  78. New concept of a power amp
  79. Lundahl and rectifier mismatch?
  80. Resurrecting weak tubes
  81. Best DHT heater?
  82. Help requested for EL84 SET amp
  83. What did I buy??
  84. Edcor and Custom Power Transformer Design
  85. What would you make with this power TX?
  86. Lundahl 1676
  87. DHT for 300B problem
  88. Newbie question about output transformer to speaker matching
  89. Red board add-on phono/RIAA pre-amp
  90. 2 Chassis amp
  91. Is It posible to bridge two quad II monoblocks?
  92. Power tube at work picture
  93. Tube SE power amp , which one??
  94. Hickok 539A issue
  95. Noise in one channel? Pioneer SX-400
  96. Hartung / Prestla OTL amps
  97. Lafayette Model 417
  98. Extreme plate load
  99. What do you think about this idea
  100. el84pse schem, need advice
  101. Video pentodes as outputs
  102. Custom Vibrolux Reverb noise issue
  103. Chinese "Audio Research" KT88s
  104. Fender bandmaster rectifire problem.
  105. New 6C33 Socket
  106. 2a3 PP output transformer
  107. PSU problem - Murphy is an ***hole!
  108. Best SET design?
  109. Anybody ever tried EBC41 as 12AX7 substitute?
  110. The 7242
  111. 12bh7a
  112. Phase Splitter Help
  113. Oscilloscope Question
  114. sizing opt
  115. 6P3C-E Datasheet help
  116. on the toroids again
  117. OPT problem or Something else 6L6 PP
  118. Look what I found!
  119. Help, Diy tube amp
  120. Idea
  121. a few DIY tube amplifier setups
  122. 6L6 PP amp motorboating
  123. Mayer-inspired 4P1L
  124. 6L6 WGB 2X34W STEREO AMPL
  125. Isolation transformation wiring project help
  126. Tube Amp DIY or Retail
  127. Supplier for GU50 tubes
  128. 2E26's
  129. Encel Stereophonic M.F.B CSM 40 amplifier
  130. Mono 300B SE Amplifier
  131. Broken tubes for 3D Modelling
  132. Loud hum in one channel
  133. 6EM7 PP question
  134. 12AU7/IRF610 Hybrid Amplifier
  135. 12AU7/IRF610 Hybrid Amplifier
  136. RIAA preamplifier
  137. Classic amp, Chinese or scratch-build for Quad ESL?
  138. CLASS A TUBE AMPLIFIER FOR TWEETER
  139. How to gap output transformers?
  140. Cathode bypasses - partial bypass and combination bias
  141. Phase splitter
  142. YS Audio balanced Preamp
  143. Low voltage 12AU7 (19J6) -- re "starving"
  144. phase splitter
  145. JTM30 output transformer
  146. Music Angel Meng 6P1
  147. Is it possible to dampen a partially microphonic 12ax7?
  148. Pioneer SA-810 tube amp.
  149. 6C33 D.C.M.B. - Paging Ari Polisois
  150. Whose is this logo?
  151. What is grid resistance of 807/6l6 in pentode
  152. PAS Upgrade Boards by Epperson
  153. Bang and Olufsen 609k stereo se el84 fm tuner
  154. Finished EL34 tube amp... but oscilates weird..
  155. Scope Trace
  156. Drifty tubes
  157. Choosing plate voltage
  158. Determining Zout for SRPP
  159. PX25 amplifier - thoughts?
  160. Testing Ck5703 tubes
  161. When can screen voltage be higher than plate???
  162. 31AL10's
  163. Lafayette TE-50 Tube Tester
  164. Acoustic (not Audio) Alchemy - I need a wizzard
  165. current feedback
  166. dac with tube buffer/preamp
  167. Sowter 3607
  168. Back to Loftin-White
  169. What to build? (I have a lot of parts)
  170. Grounding chassis through RCA
  171. K40Y-9: Questions And Comments
  172. buffer line stage schematic
  173. Dual triode Thanks for the pre-attenuation link
  174. Help With Alps Volume Pot Noise
  175. 6AM4 driving 45???
  176. Franks 6sn7 line stage question
  177. Edcor power tx XPWR035 issue
  178. Recommend me a schematic for El34 or KT88 ?
  179. RH84 Power supply
  180. Pentode driving a SE triode? any experience?
  181. Big tubes thread
  182. Meng Yayi KT88 MonoBlock
  183. Old Dumont Console - Story and Questions
  184. Newbie GlassWare Aikido All in One Questios
  185. Building my 1st tube amp
  186. A good tube for my SE 5K-8 OPT's
  187. 6c33 - ready, SET, GO
  188. Noisy tube rectifier goes quiet when i put my hand NEAR it
  189. Tweed 5E3 Deluxe Project Problems
  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. Vox AV 100 Mk2
  199. Stereo amplifyer project
  200. 6sl7 6sl7 dynaco driver board
  201. PCB for stand alone 5W SE
  202. Triode VS. UL bias
  203. How to test a DIY amp?
  204. Morgan Jones 4th ed
  205. How close is too close when designing an amp
  206. Fatman I tube Problem
  207. 807 p-p tube amp schematic
  208. TUBELAB SIMPLE SE
  209. Listen to 6DJ8 Triode through Power Chip IC. Easy project.
  210. Cheap motor caps(MKP) vs Electrolitics
  211. James O/P Tx
  212. Ripple reduction with added voltage compensation to HV
  213. SEVETLANA "SV" 6550 C vs 6550 C
  214. Frank's 6SN7 - plate follower, noise
  215. Help running RH807 at higher voltage
  216. Preamp hum issues
  217. EML mesh plate 2a3 in DRD amp
  218. How to run RH807 at 400V?
  219. Preamp Umbilical - Use Shield as Ground Lead?
  220. Automatic Bias Control sliding bias
  221. Edcor Output Transformer Resistance
  222. Would this be worthwile restoring?
  223. Historic Tube Amplifiers
  224. 6HF5 testing
  225. A quick question about NFB
  226. PAS3 - are the tone controls really *that* bad?
  227. PP OPT in SE mode operation?
  228. Cheap 6n6p double ended push-pull idea - thoughts?
  229. Vintage WE Tubes
  230. SE amplifier advice..
  231. Mineature Tubes
  232. MD SM 102b transformer spec's please
  233. Vintage Marconi radio
  234. second order harmonics
  235. Hybrid amplifier
  236. Input caps for Motorola Console Amps
  237. to much gain
  238. Question - Type 19 tube
  239. alternative for footswitch??
  240. Noob. Help PP EL34 / EF86 both as triode schem.
  241. Yet another LA-2A
  242. RH84 SE, pentode driver... advice please
  243. Having an issue with a MOSFET in my Blue Hawaii
  244. Info wanted on OPT....
  245. 6P43P Strange Plate Graphs
  246. Multiple Phono preamp
  247. pas filament supply
  248. HV on high voltage amps
  249. Lageschaar hybrid-connection PSE-KT66
  250. First DIY from scratch

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