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  1. 3 channel all tube preamp pedal w/fx loops for all clone build
  2. Tube CAD?
  3. Cap Problem with philco 49-1401
  4. Music Angel
  5. Help 7189A Tubes!
  6. Bulb in cathode?
  7. Gain and volume pots - newbie question
  8. Resistor test TX7525 AMRG CMF55
  9. I think I made a mistake
  10. 12at7 and 12au7
  11. PSE KT88 using Mikael's basic schematic.....
  12. PSU sanity check - negative rail?
  13. Mods Tube Amps/Pre-amp
  14. Help to find out what OPT are these
  15. LL1660 P PZ Lundahl interstage ringing problem GM70pp
  16. Possible PS chokes
  17. Adding Bal output to Akido
  18. Input impedance, the higher the better or not?
  19. Risk of DC coupled input with tube pre-amp ?
  20. UL Cascode phono
  21. DC Imbalance with the LTP
  22. More Wireless World articles archived
  23. Yaqin VK-2100 Static from one channel
  24. Direct Coupled, Self Biasing, CCS Loaded, 300B Amp
  25. Testing a 300A on a B&K
  26. Diodes to tube
  27. PL84/EL86 push pull
  28. circuit diagram
  29. Ultralinear operation
  30. 60hz hum in component system
  31. Crackling Amp
  32. Regulated Supply for Direct Coupled Amp
  33. Explanation wanted
  34. Dynaco FM1 stereo updating ?
  35. tube amp diy off. Is this a good deal?
  36. SE driver
  37. DN2540 + LM317 cascode CCS?
  38. Recapping old tube amp
  39. How a SRPP stage sounds like?
  40. Help troubleshooting SE Pentode amp
  41. What meter for Bias?
  42. Mains tranformer noise
  43. Tube tester block diagram
  44. got a custom 829b amp that i got laying around, need to know what driver to use
  45. Universal filament regulator
  46. ECC88 - 6DJ8 Cascode Plate Curves
  47. Gain of Phase Inverter
  48. CF/CCS, can it be made simpler?
  49. 2A3 Heater Hum Pot
  50. Need help - black out while the amp. was on
  51. simple question about cathodyne PI
  52. Where can I get a cover for the OPT and PS
  53. Power supply for heater
  54. how to use oscilloscope
  55. I am collecting parts for my 200w mono amps "But"
  56. This seems wrong?
  57. StoetKit Junior Schematics
  58. Valve Amplifiers 3rd edition Errata
  59. Anybody ever compared the Eico HF81 to Harman Kardon A220 "The Lute"?
  60. 6v6 datasheet
  61. Leaving filaments on?
  62. output caps -- your observations, pleeze
  63. Low gain preamp.
  64. Recommended Tube/Valve references?
  65. Stand Alone guitar power amp
  66. Tube Socket Identification
  67. Some agreement on reasonable affordable and well performing design builds?
  68. Fletcher cooke OTL article
  69. I have 4 Pl504's. Are they best used as SE or PP ?
  70. More k12g amp musings
  71. How preserve loudness circuit with new volume pot?
  72. Where to find 212E tubes???
  73. Music Angel XD-SE EL34 Amp
  74. CV345 VS EL34
  75. Reducing Filment Hum in Tubes
  76. push pull power amp
  77. 6 ohm speakers....
  78. Need a 12.6 VDC power supply schematic
  79. Gold Lion KT88 Issue
  80. Plate currents in P-P
  81. Bass preamp + Edcor balanced out = HUM!
  82. Testing amplifiers with computer software...
  83. Welborn Labs - Abysmal Service
  84. Repairing broken pins on valuable tube...
  85. Explain how feedback affects DF?
  86. Low emissions
  87. Tube Blue Glow question
  88. Common-mode choke before or after?
  89. 6l6 data sheet question
  90. Mic preamp
  91. Physical Tube Diagnosis?
  92. how and why power amps clip
  93. 80's Guitar Amp...replacing o/p tubes...which 6L6 should i try?
  94. Vacuum Tube OTL power amp!!
  95. Tube replacement options.....
  96. balanced RIAA amp
  97. power amp distortion
  98. Suggestions for 5k5 40W iron?
  99. Peavey Classic 30 Reverb headscratcher...
  100. Schematic Tube Analog Output Stage???
  101. 300B 'direct drive' using a 6U8..
  102. Magnavox 88-02 power trans ratings?
  103. Preamp with humming noise!
  104. How to choose line out transformer?
  105. Tools for Cutting Tube Socket Holes?
  106. Switchable SE.
  107. GZ33 in place of 5U4 can it be done?
  108. phase splitter issue
  109. Armstrong A10 MK2 EL34 mono block
  110. "Ug" The Transformer
  111. i think its time i start playing with caps
  112. problems with preamp on home brew
  113. LS180 Tube Socket?
  114. simple question - 5V heater power supply
  115. Lineamp
  116. FI AUDİO 421 A
  117. Pete Millett has another Red Board for sale
  118. Jolida JD9 Problem
  119. 6N11 = 6N1P ?
  120. K12-G tube amp problem
  121. Please vote for one of the schematics.
  122. Advantages of separate PS for input and output stages
  123. Another PCB tube amp design
  124. Help. Replacement OPT sqrueeechhh.
  125. New concept of a power amp
  126. Lundahl and rectifier mismatch?
  127. Resurrecting weak tubes
  128. Best DHT heater?
  129. Help requested for EL84 SET amp
  130. What did I buy??
  131. Edcor and Custom Power Transformer Design
  132. What would you make with this power TX?
  133. Lundahl 1676
  134. DHT for 300B problem
  135. Newbie question about output transformer to speaker matching
  136. Red board add-on phono/RIAA pre-amp
  137. 2 Chassis amp
  138. Is It posible to bridge two quad II monoblocks?
  139. Power tube at work picture
  140. Tube SE power amp , which one??
  141. Hickok 539A issue
  142. Noise in one channel? Pioneer SX-400
  143. Hartung / Prestla OTL amps
  144. Lafayette Model 417
  145. Extreme plate load
  146. What do you think about this idea
  147. el84pse schem, need advice
  148. Video pentodes as outputs
  149. Custom Vibrolux Reverb noise issue
  150. Chinese "Audio Research" KT88s
  151. Fender bandmaster rectifire problem.
  152. New 6C33 Socket
  153. 2a3 PP output transformer
  154. PSU problem - Murphy is an ***hole!
  155. Best SET design?
  156. Anybody ever tried EBC41 as 12AX7 substitute?
  157. The 7242
  158. 12bh7a
  159. Phase Splitter Help
  160. Oscilloscope Question
  161. sizing opt
  162. 6P3C-E Datasheet help
  163. on the toroids again
  164. OPT problem or Something else 6L6 PP
  165. Look what I found!
  166. Help, Diy tube amp
  167. Idea
  168. a few DIY tube amplifier setups
  169. 6L6 PP amp motorboating
  170. Mayer-inspired 4P1L
  171. 6L6 WGB 2X34W STEREO AMPL
  172. Isolation transformation wiring project help
  173. Tube Amp DIY or Retail
  174. Supplier for GU50 tubes
  175. 2E26's
  176. Encel Stereophonic M.F.B CSM 40 amplifier
  177. Mono 300B SE Amplifier
  178. Broken tubes for 3D Modelling
  179. Loud hum in one channel
  180. 6EM7 PP question
  181. 12AU7/IRF610 Hybrid Amplifier
  182. 12AU7/IRF610 Hybrid Amplifier
  183. RIAA preamplifier
  184. Classic amp, Chinese or scratch-build for Quad ESL?
  185. CLASS A TUBE AMPLIFIER FOR TWEETER
  186. How to gap output transformers?
  187. Cathode bypasses - partial bypass and combination bias
  188. Phase splitter
  189. YS Audio balanced Preamp
  190. Low voltage 12AU7 (19J6) -- re "starving"
  191. phase splitter
  192. JTM30 output transformer
  193. Music Angel Meng 6P1
  194. Is it possible to dampen a partially microphonic 12ax7?
  195. Pioneer SA-810 tube amp.
  196. 6C33 D.C.M.B. - Paging Ari Polisois
  197. Whose is this logo?
  198. What is grid resistance of 807/6l6 in pentode
  199. PAS Upgrade Boards by Epperson
  200. Bang and Olufsen 609k stereo se el84 fm tuner
  201. Finished EL34 tube amp... but oscilates weird..
  202. Scope Trace
  203. Drifty tubes
  204. Choosing plate voltage
  205. Determining Zout for SRPP
  206. PX25 amplifier - thoughts?
  207. Testing Ck5703 tubes
  208. When can screen voltage be higher than plate???
  209. 31AL10's
  210. Lafayette TE-50 Tube Tester
  211. Acoustic (not Audio) Alchemy - I need a wizzard
  212. current feedback
  213. dac with tube buffer/preamp
  214. Sowter 3607
  215. Back to Loftin-White
  216. What to build? (I have a lot of parts)
  217. Grounding chassis through RCA
  218. K40Y-9: Questions And Comments
  219. buffer line stage schematic
  220. Dual triode Thanks for the pre-attenuation link
  221. Help With Alps Volume Pot Noise
  222. 6AM4 driving 45???
  223. Franks 6sn7 line stage question
  224. Edcor power tx XPWR035 issue
  225. Recommend me a schematic for El34 or KT88 ?
  226. RH84 Power supply
  227. Pentode driving a SE triode? any experience?
  228. Big tubes thread
  229. Meng Yayi KT88 MonoBlock
  230. Old Dumont Console - Story and Questions
  231. Newbie GlassWare Aikido All in One Questios
  232. Building my 1st tube amp
  233. A good tube for my SE 5K-8 OPT's
  234. 6c33 - ready, SET, GO
  235. Noisy tube rectifier goes quiet when i put my hand NEAR it
  236. Tweed 5E3 Deluxe Project Problems
  237. Strange ancient looking tube amp
  238. Vintage Dynaco vs. Triode Electronics
  239. LINE PRE - 6N9S - 6dB
  240. Can I balance a diff stage like this?
  241. Ways to design for low IM distortion
  242. Genalex KT88 Plate Dissipation Question
  243. difference between SE and PP transformer
  244. I put a bad ouput tube in my amp, did I hurt it?
  245. Vox AV 100 Mk2
  246. Stereo amplifyer project
  247. 6sl7 6sl7 dynaco driver board
  248. PCB for stand alone 5W SE
  249. Triode VS. UL bias
  250. How to test a DIY amp?

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