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  1. ohms and watts
  2. Introduction/Question: Multipurpose OT/PT for amp prototyping?
  3. Canīt find the right tube for my poweramp
  4. 5F2A and 5F2 fuse ratings
  5. active tonestack
  6. Max UF for 5Y3 Rectifier
  7. Preamp too loud
  8. The Mighty Terror!! (50W OTT inspired amp)
  9. Cap bypassed cathode bias vs fixed bias?
  10. need a smallish tube for high plate voltages, fixed bias
  11. Help check my schematic design
  12. screen resistor in 5F2A
  13. Difference in tone between class A and AB ?
  14. Tube powered Wah Pedal help
  15. Standby Switch on Bassman
  16. Cobble PT = 265-0-265 What to do with that?
  17. Separate Cathode Bypass Resistor/Cap per 6V6
  18. Standby for Valve Jr. ?
  19. Choosing OT from OT's
  20. Capacitors
  21. component trouble again
  22. Strange new vibrato circuit in DR Reissue
  23. 50w vs 100w distortion
  24. Fender Silverface Eyelet or PC Boards?
  25. Voltage trippling.
  26. passive leslie
  27. Newb OT question
  28. IRF710 as Ampeg style verb driver?
  29. Chassis Layout for new project
  30. Clipping diodes?
  31. PI output swing voltage ?
  32. Which Reverb Tank?
  33. using 230v mains voltage directly for high voltage
  34. determining PT plate currents for used TF's
  35. Need advice for simplified blackface style 6V6 amps
  36. Mic Splitter?
  37. suitable for Preamp Power Supply here>?
  38. Explanation of this circuit
  39. L-Pad and fixed R bypassing rheostat question
  40. Randall Valve-Dynamic G3 series schematics?
  41. interesting low-power beam power tube- 5686
  42. Switching Plate Load
  43. Weber Transformers
  44. Class A SE vs Class A PP?
  45. speaker phase
  46. This may be some Jello for thought.
  47. Illinois Capacitors?
  48. Apologies if this was already covered...
  49. Transformer Choices, Mojo, Allen, Mercury
  50. Help choosing a custom Fender cab (photos) NEED OPINIONS
  51. New Build - Class A 6L6
  52. Power tube Ap=Wattage?
  53. Plate load Z
  54. tone differences with different primary Z ???
  55. Beam Blocker Design
  56. Footswitch build For Vibroverb
  57. Inside an Output Transformer
  58. new design PT/OT
  59. switch rating cathode/fixed bias
  60. Svt midrange inductor, diy?
  61. Why do they use this?
  62. what about calss D
  63. Fixed AND cathode bias?
  64. New Electrolytic Capacitor Forming?
  65. Bias is bias, or is it ?
  66. Bright switch
  67. How do you calculate the power output of your SE amp?
  68. PPP primary impedance load Q
  69. Signal Leaking
  70. Good prototyping board?
  71. Line-out vs Pre-out
  72. ORANGE MKII schematic
  73. Safe power range for EL34.
  74. Hammond 125C for SE use?
  75. Fender brown preamps
  76. EM 800 "Magic Eye" tubes
  77. Master volume - switchable
  78. Coupling caps
  79. 2 el84s and 2 6v6s PP, same output tranny ?
  80. biasing preamp tubes?
  81. induced hum on cathode wire?
  82. Simulating a 10 meg pot with a rotary switch
  83. replacing a pot with fixed resistors (help)...
  84. value of resistors in voltage divider?
  85. PT values for 5E3, 5E9A and 5F11
  86. Bass amps w/ preamp tube
  87. How to prolong the life of tube
  88. Channel switching relays.
  89. Plexi and Mesa high-gain sounds from one amp?
  90. Problems with extra gain stage in 2203
  91. why multiple stages?
  92. caps across plate resistors - questions...
  93. need a schematic for a attenuator
  94. How many watt VR being attenuater in 5w tube amp
  95. new preamp for 200w amp- tone stack question
  96. transformer for multi-class operation
  97. How many dB are needed?
  98. Using the second input of the LTP?
  99. Fixed Bias for a Single Ended Design?
  100. Yikes! 5150-3
  101. Need to change 22K resistor to 27K when changing from 5U4 to GZ34?
  102. preamp schematic help
  103. Rectifier switch from tube to diode
  104. Round 13--better cabinet emulated direct sounds
  105. Beginners tips and advice on new design..
  106. Beginner-- suggestions for PC programs
  107. any R/C filter charts?
  108. coupling cap & voltage divider question...
  109. 2203 with extra gain stage - still have a spare triode, what to do?
  110. LC filter design help
  111. Phase inverter fine tuning help. AX7 or AT7?
  112. Reverb using two triodes
  113. How does the tonestack circuit work??
  114. Problems with gain in my circuit
  115. using 2 different impaedance taps simultaneously
  116. low end and how to reduce it?
  117. Trying to understand 2nd gain stage
  118. 60s Marshall Presence Circuits
  119. 2n3904 bias resistor
  120. Using A Pot To Control Feedback Loop
  121. What makes a Fender a Fender???
  122. Treble distortion
  123. Wiring a push pull potentiometer for channel defeat
  124. Music Man output section?
  125. Gain of Long Tail PI?
  126. Brownface tone control question
  127. adjusting bias in 5G9
  128. EF86 amp block diagram
  129. M*tchless RV-1 Rosetta Stone?
  130. Is this possible?
  131. Adding FX loop to 5G9 - locating sockets
  132. MARK IV EQ Scaling
  133. How much gain in each ampstage for maximum tone ?
  134. Circuit & Layout Review for PP amp
  135. 5G9 PT, OT and Choke layout
  136. Input Stage Advice?
  137. Repairing a Bl@nkenshib
  138. Narrow Panel Deluxe question
  139. Adding a cathode follower
  140. 35D5 pentode any used in guitar amps?
  141. Thinking about building a transformer test rig
  142. the importance matching impedance with tube amps
  143. EZ81- how much can they really take?
  144. Marshall V2a and b
  145. recommend marshall 50 watt OT and PT
  146. will this work?
  147. Power supply question
  148. Multiple Coupling Caps+Dropping R's?
  149. new project
  150. komboking alternative?
  151. MOVs
  152. 1n4007 spike protection
  153. 5E3X2 no screen resistors
  154. Beginner amp building questions
  155. series heaters for 12ax7 preamp 24vac
  156. Output transformer tech questions
  157. PT current question
  158. how to start learning amp repair have some nolage
  159. Building a push-pull - what's different?
  160. running Marshalls cathode biased
  161. Dropping heater voltage
  162. Diode||Resistor in signal path
  163. Lead dress tips?
  164. THD Yellowjacket theory?
  165. Adding 5V Supply
  166. Please comment this amp design...
  167. Can you suggest a source for new transformer laminations?
  168. First attempt at design, suggestions please.
  169. What would cause this?
  170. 100uF/500V vs 2x220uF/350V
  171. spacing between eyelets on a board
  172. Plate resistors on preamps
  173. What is a cathode follower?
  174. Quick jfet question...
  175. Multi-Stage Preamp
  176. 6BM8 tubes... what to use them for!
  177. simulate ultralinear transformer with resistors?
  178. Small amps, output transformer hum
  179. OT location?
  180. Recommend me a PT please
  181. Single tube reverb revisited- long boring post
  182. Can I use a 12AU7 based preamp with my SS power amp?
  183. 6L6PP Cathode Bias
  184. Biasing SE class A, fixed bias
  185. 6146A/B cathode bias not recommended?
  186. Critique my schematic, please
  187. Direct/preamp out schematic?
  188. Another recomend me an PT
  189. Vox and Matchless are having my baby..
  190. Switching Problem...
  191. Output tube configs...
  192. tube amp attenuators
  193. PSU question
  194. What characteristics do you get from parallel tridoes?
  195. AC filament supply?
  196. Preamp Recommendations??
  197. Output transformer interleaving?
  198. amount of gain in AC30
  199. hole sizes for chassis plans
  200. Driving 6L6s into clipping
  201. choke question
  202. Direct input to a cathode follower
  203. Preamp selection woes...
  204. Fender style neg bias adjust vs balance
  205. "Champ" power tube options and load requirements
  206. 6AQ5 vs. 6BQ5/EL84
  207. All 6sn7 preamp for 6v6? First schematic design!
  208. trying not to exceed 6X4 ratings
  209. Quadrupling filamen to drive IC?
  210. Cathode Transistor?
  211. Adding another stage to this schematic...
  212. Screen R question
  213. Resistor in series with choke
  214. Heptode preamp
  215. Adding screen resistor where there was none before?
  216. switching between tone controls
  217. AB165 second gain stage
  218. heater issue w/new build
  219. Mains current draw
  220. bias voltage
  221. Combination cathode bias and fixed bias
  222. Can i replace choke with a resistor?
  223. Caps to ground from preamp plates
  224. More home made attenuator questions
  225. Oscilloscope... this good?
  226. Long-tailed Pair mods and what they do
  227. MOSFET op-amps vs Tubes... signal characteristics?
  228. John Martin
  229. multi-stage Preamp question
  230. 5Y3GT data sheet?
  231. Output tubes' current or negative voltage?
  232. EL84 and 6L6 in same amp - how to get 2 different B+?
  233. 2 x 6AQ5 pushpull with 6X4 rectifier question
  234. schematic and question
  235. Very little sound
  236. Coupling cap in input stage
  237. Tone stack input impedance?
  238. TMB tone stack -- what tube and components?
  239. MOSFET signal inverter?
  240. Cathode bias in 5G9
  241. More bass!!
  242. Using a pot instead of 2 resistors for a heater center tap
  243. Fixed bias question.
  244. older tubes question
  245. salvaged ot
  246. Coupling cap question - 2 caps separated by a resistor?
  247. Advice needed: unorthodox schem
  248. Bias problem
  249. Dumble thoughts
  250. schematic software