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  1. Adding Bal output to Akido
  2. Input impedance, the higher the better or not?
  3. Risk of DC coupled input with tube pre-amp ?
  4. UL Cascode phono
  5. DC Imbalance with the LTP
  6. More Wireless World articles archived
  7. Yaqin VK-2100 Static from one channel
  8. Direct Coupled, Self Biasing, CCS Loaded, 300B Amp
  9. Testing a 300A on a B&K
  10. Diodes to tube
  11. PL84/EL86 push pull
  12. circuit diagram
  13. Ultralinear operation
  14. 60hz hum in component system
  15. Crackling Amp
  16. Regulated Supply for Direct Coupled Amp
  17. Explanation wanted
  18. Dynaco FM1 stereo updating ?
  19. tube amp diy off. Is this a good deal?
  20. SE driver
  21. DN2540 + LM317 cascode CCS?
  22. Recapping old tube amp
  23. How a SRPP stage sounds like?
  24. Help troubleshooting SE Pentode amp
  25. What meter for Bias?
  26. Mains tranformer noise
  27. Tube tester block diagram
  28. got a custom 829b amp that i got laying around, need to know what driver to use
  29. Universal filament regulator
  30. ECC88 - 6DJ8 Cascode Plate Curves
  31. Gain of Phase Inverter
  32. CF/CCS, can it be made simpler?
  33. 2A3 Heater Hum Pot
  34. Need help - black out while the amp. was on
  35. simple question about cathodyne PI
  36. Where can I get a cover for the OPT and PS
  37. Power supply for heater
  38. how to use oscilloscope
  39. I am collecting parts for my 200w mono amps "But"
  40. This seems wrong?
  41. StoetKit Junior Schematics
  42. Valve Amplifiers 3rd edition Errata
  43. Anybody ever compared the Eico HF81 to Harman Kardon A220 "The Lute"?
  44. 6v6 datasheet
  45. Leaving filaments on?
  46. output caps -- your observations, pleeze
  47. Low gain preamp.
  48. Recommended Tube/Valve references?
  49. Stand Alone guitar power amp
  50. Tube Socket Identification
  51. Some agreement on reasonable affordable and well performing design builds?
  52. Fletcher cooke OTL article
  53. I have 4 Pl504's. Are they best used as SE or PP ?
  54. More k12g amp musings
  55. How preserve loudness circuit with new volume pot?
  56. Where to find 212E tubes???
  57. Music Angel XD-SE EL34 Amp
  58. CV345 VS EL34
  59. Reducing Filment Hum in Tubes
  60. push pull power amp
  61. 6 ohm speakers....
  62. Need a 12.6 VDC power supply schematic
  63. Gold Lion KT88 Issue
  64. Plate currents in P-P
  65. Bass preamp + Edcor balanced out = HUM!
  66. Testing amplifiers with computer software...
  67. Welborn Labs - Abysmal Service
  68. Repairing broken pins on valuable tube...
  69. Explain how feedback affects DF?
  70. Low emissions
  71. Tube Blue Glow question
  72. Common-mode choke before or after?
  73. 6l6 data sheet question
  74. Mic preamp
  75. Physical Tube Diagnosis?
  76. how and why power amps clip
  77. 80's Guitar Amp...replacing o/p tubes...which 6L6 should i try?
  78. Vacuum Tube OTL power amp!!
  79. Tube replacement options.....
  80. balanced RIAA amp
  81. power amp distortion
  82. Suggestions for 5k5 40W iron?
  83. Peavey Classic 30 Reverb headscratcher...
  84. Schematic Tube Analog Output Stage???
  85. 300B 'direct drive' using a 6U8..
  86. Magnavox 88-02 power trans ratings?
  87. Preamp with humming noise!
  88. How to choose line out transformer?
  89. Tools for Cutting Tube Socket Holes?
  90. Switchable SE.
  91. GZ33 in place of 5U4 can it be done?
  92. phase splitter issue
  93. Armstrong A10 MK2 EL34 mono block
  94. "Ug" The Transformer
  95. i think its time i start playing with caps
  96. problems with preamp on home brew
  97. LS180 Tube Socket?
  98. simple question - 5V heater power supply
  99. Lineamp
  100. FI AUDİO 421 A
  101. Pete Millett has another Red Board for sale
  102. Jolida JD9 Problem
  103. 6N11 = 6N1P ?
  104. K12-G tube amp problem
  105. Please vote for one of the schematics.
  106. Advantages of separate PS for input and output stages
  107. Another PCB tube amp design
  108. Help. Replacement OPT sqrueeechhh.
  109. New concept of a power amp
  110. Lundahl and rectifier mismatch?
  111. Resurrecting weak tubes
  112. Best DHT heater?
  113. Help requested for EL84 SET amp
  114. What did I buy??
  115. Edcor and Custom Power Transformer Design
  116. What would you make with this power TX?
  117. Lundahl 1676
  118. DHT for 300B problem
  119. Newbie question about output transformer to speaker matching
  120. Red board add-on phono/RIAA pre-amp
  121. 2 Chassis amp
  122. Is It posible to bridge two quad II monoblocks?
  123. Power tube at work picture
  124. Tube SE power amp , which one??
  125. Hickok 539A issue
  126. Noise in one channel? Pioneer SX-400
  127. Hartung / Prestla OTL amps
  128. Lafayette Model 417
  129. Extreme plate load
  130. What do you think about this idea
  131. el84pse schem, need advice
  132. Video pentodes as outputs
  133. Custom Vibrolux Reverb noise issue
  134. Chinese "Audio Research" KT88s
  135. Fender bandmaster rectifire problem.
  136. New 6C33 Socket
  137. 2a3 PP output transformer
  138. PSU problem - Murphy is an ***hole!
  139. Best SET design?
  140. Anybody ever tried EBC41 as 12AX7 substitute?
  141. The 7242
  142. 12bh7a
  143. Phase Splitter Help
  144. Oscilloscope Question
  145. sizing opt
  146. 6P3C-E Datasheet help
  147. on the toroids again
  148. OPT problem or Something else 6L6 PP
  149. Look what I found!
  150. Help, Diy tube amp
  151. Idea
  152. a few DIY tube amplifier setups
  153. 6L6 PP amp motorboating
  154. Mayer-inspired 4P1L
  155. 6L6 WGB 2X34W STEREO AMPL
  156. Isolation transformation wiring project help
  157. Tube Amp DIY or Retail
  158. Supplier for GU50 tubes
  159. 2E26's
  160. Encel Stereophonic M.F.B CSM 40 amplifier
  161. Mono 300B SE Amplifier
  162. Broken tubes for 3D Modelling
  163. Loud hum in one channel
  164. 6EM7 PP question
  165. 12AU7/IRF610 Hybrid Amplifier
  166. 12AU7/IRF610 Hybrid Amplifier
  167. RIAA preamplifier
  168. Classic amp, Chinese or scratch-build for Quad ESL?
  169. CLASS A TUBE AMPLIFIER FOR TWEETER
  170. How to gap output transformers?
  171. Cathode bypasses - partial bypass and combination bias
  172. Phase splitter
  173. YS Audio balanced Preamp
  174. Low voltage 12AU7 (19J6) -- re "starving"
  175. phase splitter
  176. JTM30 output transformer
  177. Music Angel Meng 6P1
  178. Is it possible to dampen a partially microphonic 12ax7?
  179. Pioneer SA-810 tube amp.
  180. 6C33 D.C.M.B. - Paging Ari Polisois
  181. Whose is this logo?
  182. What is grid resistance of 807/6l6 in pentode
  183. PAS Upgrade Boards by Epperson
  184. Bang and Olufsen 609k stereo se el84 fm tuner
  185. Finished EL34 tube amp... but oscilates weird..
  186. Scope Trace
  187. Drifty tubes
  188. Choosing plate voltage
  189. Determining Zout for SRPP
  190. PX25 amplifier - thoughts?
  191. Testing Ck5703 tubes
  192. When can screen voltage be higher than plate???
  193. 31AL10's
  194. Lafayette TE-50 Tube Tester
  195. Acoustic (not Audio) Alchemy - I need a wizzard
  196. current feedback
  197. dac with tube buffer/preamp
  198. Sowter 3607
  199. Back to Loftin-White
  200. What to build? (I have a lot of parts)
  201. Grounding chassis through RCA
  202. K40Y-9: Questions And Comments
  203. buffer line stage schematic
  204. Dual triode Thanks for the pre-attenuation link
  205. Help With Alps Volume Pot Noise
  206. 6AM4 driving 45???
  207. Franks 6sn7 line stage question
  208. Edcor power tx XPWR035 issue
  209. Recommend me a schematic for El34 or KT88 ?
  210. RH84 Power supply
  211. Pentode driving a SE triode? any experience?
  212. Big tubes thread
  213. Meng Yayi KT88 MonoBlock
  214. Old Dumont Console - Story and Questions
  215. Newbie GlassWare Aikido All in One Questios
  216. Building my 1st tube amp
  217. A good tube for my SE 5K-8 OPT's
  218. 6c33 - ready, SET, GO
  219. Noisy tube rectifier goes quiet when i put my hand NEAR it
  220. Tweed 5E3 Deluxe Project Problems
  221. Strange ancient looking tube amp
  222. Vintage Dynaco vs. Triode Electronics
  223. LINE PRE - 6N9S - 6dB
  224. Can I balance a diff stage like this?
  225. Ways to design for low IM distortion
  226. Genalex KT88 Plate Dissipation Question
  227. difference between SE and PP transformer
  228. I put a bad ouput tube in my amp, did I hurt it?
  229. Vox AV 100 Mk2
  230. Stereo amplifyer project
  231. 6sl7 6sl7 dynaco driver board
  232. PCB for stand alone 5W SE
  233. Triode VS. UL bias
  234. How to test a DIY amp?
  235. Morgan Jones 4th ed
  236. How close is too close when designing an amp
  237. Fatman I tube Problem
  238. 807 p-p tube amp schematic
  239. TUBELAB SIMPLE SE
  240. Listen to 6DJ8 Triode through Power Chip IC. Easy project.
  241. Cheap motor caps(MKP) vs Electrolitics
  242. James O/P Tx
  243. Ripple reduction with added voltage compensation to HV
  244. SEVETLANA "SV" 6550 C vs 6550 C
  245. Frank's 6SN7 - plate follower, noise
  246. Help running RH807 at higher voltage
  247. Preamp hum issues
  248. EML mesh plate 2a3 in DRD amp
  249. How to run RH807 at 400V?
  250. Preamp Umbilical - Use Shield as Ground Lead?

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