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  1. Using LED bias for 4.5 mA cathode current, is it a good idea?
  2. amp dead?
  3. 7189 vs EL84 +458v plate
  4. What does your Aikido drive?
  5. Help with Decware SE84 Kit!
  6. Hybrid Amplifier in Small cases
  7. audio mixer with tubes?
  8. Epiphone Galaxy 25 transformer problem
  9. Help with KT88 biasing
  10. Bad Schottky??
  11. Aikido Diagnostic
  12. Could this become a Baby Huey killer ?
  13. SV83 vs EL84
  14. KT88 PP-5 Monoblock Amplifier
  15. RE604 SET amp
  16. Dropping rectifier filament voltage
  17. need suggestion about MC pre-pre
  18. New gain stage .. Opinions???
  19. Using SS to augment < 100Hz?
  20. A help with an soviet transformer.
  21. I thought that I had seen everything
  22. Triatic PP-amp with 6p14p
  23. Single 6N6P stereo pre-amp
  24. Tubelab SE input tube filament
  25. high frequency oscillation and decoupling question
  26. Long tailed pair schematic questions
  27. CCS Kit options
  28. Variac Question for Thatch_Ear
  29. 13e1
  30. Rogers Tube Amp
  31. Pair of McIntosh MC-60 on Dallas Craigslist
  32. Lundahl LL1517. What is it good for?
  33. Edcor OPT Voltage Rating?
  34. Which Tube to Start with?
  35. Basic Transformer hookup wiring
  36. Beta followers, biasing.
  37. 6W 2xEL519 Half-hybrid Class-A OTL
  38. Can a Class AB PP amp be said to be operating in Class A at low signal levels?
  39. Wiring / Layout question
  40. Yaqin MC10K
  41. help me lower the gain of this preamp pls
  42. How to wiring the transformer
  43. "universal" P-P driver board
  44. series or parallel?
  45. Question about Cathode bias in this Magnavox amp. . .
  46. GK71 B+ turn on delay
  47. Paralleling Triodes in a 6SN7GT
  48. 6C33C-B. PP or SE ?
  49. 6550 Triode B+
  50. Aikido Phono Pre.....any good???
  51. Tube Preamp L&amp;R Channel different current draw
  52. amp is dead!
  53. What you think about Ayon Audio Spark SE 6C33 tube 22 W
  54. Running stereo through a single tube with dual triodes?
  55. Looking for 6AQ5 audio preamp schematic!
  56. Quad KT88 oscillation problem
  57. El86 driving high beta bipolar power tr
  58. Wikipedia article: Tube sound
  59. Installed 12&quot; Speaker in Pro Jr---Now What??
  60. How do I design a pentode constant current source plate load?
  61. Socket for 6AQ5
  62. new 845? Who produces it?
  63. Looking for a 45 SE Schematic
  64. Counterpoint SA-12 outputs 2SK134/2SJ49 work??
  65. Tube Amps left outdoors 24/7
  66. The beast OTL
  67. Input transformer: floating input = distortion
  68. Altmann's Split Feedback concept
  69. preamp for a JE LABS 2A3DX amp
  70. Phase flip needed -Interstage Transformer?
  71. Can your amp do this?
  72. AES out of 1625?
  73. Any info on Haltron 6BL8 tubes?
  74. Need Schematic for 12 Volt Tube Buffer
  75. Input impedance for Simple SE?
  76. SR-101 Pioneer Spring Reverb
  77. Basic Transformer Question - how do I know build possibilities?
  78. Source for 2.5VCT 5A filament transformers
  79. Nichicon VR VZ or GU
  80. Missing 6.3V CT/'Cockeyed Bridge' problem
  81. Best plate voltage for 6dj8 at +-6ma
  82. Max supply voltage for small DHT's
  83. Operating Temperature of KT88?
  84. First Tube Amp
  85. earthing advice on a US amp
  86. distortion at low volume
  87. interstage transformer cheating?
  88. PP EL34 or 6L6 circuits?
  89. Rectifier Capacator (voltage adjust)
  90. Passive RIAA and cap variation
  91. 6T9 push pull with Cathode Coupled input
  92. mixed bias
  93. Need help: tube DAC and Phono pre-amp
  94. Feedback equation
  95. Lafayette PA 675 Schematic ?
  96. phono preamp?
  97. Input tube recommendations...
  98. blind test tube preamp free for all
  99. Estimate Miller of Triode Strapped Pentode
  100. Tube Care for Prolonged Life
  101. bias resistor to use for a PP 300B?
  102. 12AY7 preamp schematic
  103. visio shapes
  104. vt25 in pre amp
  105. Wire Wound Pontentiometers - resistors
  106. Sound City B120
  107. Single supply 6922 buffer with 2SK CCS
  108. Aikido and 30W Class AB power buffer?
  109. Simple Pentode driver for a 45 ?
  110. Sennheiser HD 650 Question
  111. ampeg svt 2 pro preamp problem
  112. Edcor specs?
  113. hook up wire
  114. 6X5, 2x 6SL7 &amp; a 6v6GT....
  115. strange tube? E-8128
  116. Value of grid-leak resistor
  117. TubeTech Valves
  118. 1st build done.
  119. Tube socket does not fit tube
  120. 300B SET Bias Help
  121. This Connector for an Amp Umbilical?
  122. Chassis Grounding and rectifiers
  123. TechTube TM Blackburn status
  124. Protection of tubes/amp...
  125. 6sf5
  126. EF86 - Interstage transformer - EL84 PP AB
  127. Schadeode
  128. High-power amplifier using transmitting tubes
  129. Basic testing/meter question
  130. Mains voltage change for Sonic Frontiers SFS80 ?
  131. transformer unused secondary noobie question
  132. Acrosound High Power Williamson - HELP!!!!
  133. 300B Cathode Feedback + Cathode Bias
  134. "Budget" GM70 SET
  135. Chokes next to output transformers?
  136. Adding more power tubes and make a tube amp switching them?
  137. 1. time biasing...
  138. SE solution wanted
  139. tube rectifier
  140. Baldwin amp, yet another amp conversion project
  141. sorry, yet another newbie - what can I make with these???
  142. Design Help (load line) on a SE Mono Block Amp build
  143. Plate Choke SRPP…. What do think?
  144. Looking for a Fisher chassis 51 mono amp
  145. Majestic Transformers
  146. Inverted Mos HV soft start
  147. Strange S5 K-16LS oscilloscope readings
  148. Why don't pentodes require aligned grids?
  149. First design for a tube noob
  150. Newbie and ASL Wave 8 problems
  151. Evil Experiments - Hammond Paper in Oil Caps
  152. Now I know what this Tranny can do
  153. Pinnacle tubes??
  154. First Project.... and Hello
  155. VTL Integrator schematic
  156. Old transformators...
  157. 12AU7/12AT7/12AX7 preamp schmatic needed
  158. Booz preamp
  159. Mystery &quot;The Fisher&quot; console mono amp
  160. Cracks and hiss in tube guitar amp
  161. Voltage Doubler
  162. Gas Reference Tube (5651/85A1/etc) Internal Impedance
  163. Sakuma-San Pilgramage?
  164. Any HP 8903 audio analyzer owners?
  165. xL508/6KW6/17KW6
  166. 6C45 phono input only?
  167. Initial Thoughts for "Mr. Piggy" SE Amp w/Screen Driven 6P45S
  168. Switch box using VR glow tubes
  169. Ideas for a simple 6080/6AS7 Push-Pull amplifier
  170. TJ 845 Tubes
  171. Looking for a web tutorial on basic calculations
  172. Berman linestage- do I reference heaters or not?!
  173. calculating gain
  174. Simple EL84 amp...
  175. Tube Direct Box - Got design?
  176. Raphaelite Audio Transformers &amp; Sino Tube Amplifier Kits - What's your experience ?
  177. S-5 Electronics K-16LS & 6V6 Substitution
  178. how to calculate current requirement
  179. Stancor Transformer Data Sheet Needed
  180. 6BL7 replecement
  181. Toroid PT question
  182. New SET Amp
  183. What do you guys think..
  184. Output Stage in MJ Question
  185. Input voltage on an integrated tube amp
  186. 6sf5 = 1/2 12ax7?
  187. Observations of amplifier sound
  188. Sovtek KT88
  189. 24 or 24a as driver in 2 stage..?
  190. Too high transformator voltages...
  191. This power supply ok?
  192. 300B valves
  193. Modulation transformer for a driver transformer?
  194. Is 6V DC too low for heater filament?
  195. mundorff 0.47 silver in oil
  196. need manual for heathkit sp2
  197. Interresting Quiz. Which tube is this?
  198. el84 burn in time ?
  199. Tube Amp Compensation Q
  200. Quad II Advice
  201. Bias problem- 1 Socket shows extremely low bias!
  202. ECC88 vs E88CC
  203. Finally, back to my Simple SE project
  204. can trafo laminations rest on chassis?
  205. Ping Poindexter - 6SN7 Moebius Linestage Question
  206. More information wanted on this Phase Splitter Circuit
  207. Converting tube tester to Mutual Conductance
  208. 6UA4-GTA Question
  209. oscilloscope turned guitar amp?
  210. LED cathode bias - how to pick LED?
  211. preamp question
  212. Hickok tube tester calibration help needed
  213. Watch this !
  214. any Welborne Labs Ultrapath owners ?
  215. McIntosh transformer turns ratio
  216. 12E1 & S11E12 as a KT88 substitution
  217. Dynaco ST-70 Triode Conversion Techniques
  218. Larry Moore power supply
  219. SE to Balanced tube preamp idea
  220. Help on Cascode DN2540 CCS
  221. Kt88 Pp
  222. What was the diy world like before the internet?
  223. Updated my website
  224. Marshall AVT 50 preamp gain/distortion increase
  225. Interstage question in 6ac5G design
  226. Using a powered sub with my tube amp
  227. 807pp suggestions and guidance please
  228. 2 stage IT coupled SE suggestions.?
  229. WE429A similar to 6V6?
  230. 6FQ7 in RH84
  231. Deluxe Reverb Re-Issue High Frequency Noise.
  232. What splitter for this design ?
  233. preamp kit?
  234. PP power supply design questions
  235. Hammond 1650P for KT88 PP - any experience?
  236. Gibson tube amp mod for JAZZ
  237. Cathode Bypass caps - how to choose?
  238. Marantz 9 output power switch
  239. Single ended KT88 question
  240. Anyone Have a Hickok 800A
  241. Please post your experience with 6C45 and 6H30
  242. Series-Shunt Regulator I need
  243. Hammond Gripe
  244. capacitors in series- what value balancing resistors?
  245. Substituting Pentode for Triode
  246. Pentode Driver Calculations
  247. DHT and speed issues
  248. Aikido vibration issue
  249. Modified Salas Mosfet Shunt Reg
  250. What if O.H. Schade had MOSFETs?

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