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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Ripped Cone repair method
  2. Silverface Bassman 135 Ext Spkr jack...?
  3. Loud hum and blown fuse
  4. AVT150HXT Marshall head, wont play lows
  5. IIEEEE! Is this thing glued together??
  6. Behringer PMP5000
  7. Identify Parts Please...
  8. Is this a dead output transformer?!?
  9. mt54
  10. cathode resistor and cap, SFTR vs AB763
  11. F6.3l fuse
  12. Marshal 5213 Mosfet
  13. Super Reverb weak vibrato
  14. Loss of Gain in a Crate V1512
  15. Need help fixing simple SWR Triad speaker wiring
  16. How to bias an Ampeg Gemini VI gs15r
  17. VOX VT 50 crackling
  18. Ampeg B18-N Output Tubes Run Hot
  19. 65 Twin Reverb RI Reverb Noise
  20. 65 Twin Reverb RI Reverb Noise
  21. Blues Jr reverb problem?
  22. Blues Jr. Reverb Buzz
  23. Help needed with a TSL 100 head !!
  24. DeVille bias pot problem
  25. Tone Stack Calculator - Traynor
  26. AC15 has output but no sound...
  27. Mesa Lonestar special - whooshing sound
  28. Peavey Nashville 400
  29. Earth bassman 4x12 Low volume/dirty tone issue
  30. Kustom K150-5 PA no reverb
  31. Re-capping Gemini I question
  32. peavey PA 120
  33. Tube type question?? Vox
  34. Electrolytic cans voltage ratings...
  35. A Problem with the old model c?, Peavey cs800 power amp Loud Popping
  36. Source for A1M 12MM miniature pot
  37. Behringer GMX110 volume issue clean vs dirty
  38. Need Help Fender Acoustisonic
  39. red plating?
  40. "Non-serviceable" Fender amps
  41. Acoustic 150B in horrible condition
  42. Weather Strip?
  43. Marshall fuseholders
  44. moving to the USA
  45. Vox VT50 volume dependent hum?
  46. peavey tnt 130
  47. Marshall Mosfet Lead Output Stage Problem
  48. Mesa Boogie MKIII blowing fuses
  49. Looking for Fender Frontman 212R B 50K Pot
  50. Cold bias on Epiphone Triggerman
  51. Buzz
  52. Deoxit
  53. Twin Reverb - help with troubleshoot
  54. Fender Blues Deville 1994 - Cutting Out
  55. Hartke 3500 distortion in preamp
  56. heater wire for a Kalamazoo reverb 12 I just got
  57. marshall 6100 trouble
  58. Fender Super Sonic Effects Loop Issue
  59. Hello Classic 30 question.
  60. Setting bias on a Ampeg SVT 4 Pro
  61. Cap Replacement...Which caps to use
  62. Lonestar Special 5w & 15w fade out
  63. Marshall DSL 100, loudspeaker out, 16 ohms ok but parallel 4,8 ohm no sound
  64. Lab Series L4 Bass Head 200 watts, IC sub for CA3094ae Op Amp
  65. Popping/Crackling Blues Jr on Startup
  66. vibro champ
  67. Please help with my Peavey Classic 50!
  68. Peavey Renown Problem
  69. Fender Twin Reverb-less 65 RI
  70. Musicman 2100 RD line out?
  71. Thank you to the kind contributors here
  72. help me put humpty together again(Sound City Content)
  73. Fender Blue Deluxe Problem
  74. Distorted Reverb- SF Super Reverb
  75. Fading Marshall
  76. I don't think tube amps are supposed to emit smoke....
  77. Removeing the groundswitch in a Fender ab763
  78. B-52 AT100 head trouble
  79. Walter Woods parts
  80. Ampeg v4 bias supply issue
  81. Relays in Marshall TSL 100, channel switching issues
  82. Carvin BelAir troubles
  83. Roland JC-77 noisy Chrous OFF mode
  84. Roland Cube 60 Chorus CH60 - Help Chorus broken!
  85. Marshall valvestate vs65r loud pop
  86. Heater wiring for 6CG7 tube
  87. Mesa Boogie Rect-o-verb
  88. Anyone know the B+ Voltage of Marshall DSL401
  89. Randall pro-tube 2000 no sound. HELP!
  90. big trouble in home brew
  91. Problem with Laney TT100H
  92. randall rg50tc advertised as el34's sold with 5881's???
  93. Effects Loop Bleed Issue
  94. Marshall MG100 HDFX Burnt IC1
  95. GK 400RB blowing fuse on start-up
  96. Epiphone Galaxie 25
  97. Low volume issue
  98. Kustom 250 Fuzz issue
  99. Triaxis Troubleshooting
  100. Peavey kb 100 speaker replacement.
  101. Need a little help guys
  102. B-52 AT100
  103. Q: 1986 Marshall - troubleshooting
  104. stood on lead roland cube 20 dead. Help please
  105. Beginner advice
  106. Epiphone triggerman speaker?
  107. BF Showman Driver Stage Hum
  108. Trouble with Ampeg V-4
  109. BF Bandmaster rebuild troubleshooting
  110. Ruby Reverb spring repair
  111. OT Shunt biasing question...
  112. Fender FM212R Reverb Failure
  113. Yamaha T50C Soldano Overdrive Hum
  114. Need to install grounded power cable - advice
  115. 5E3 serious crackling
  116. Crate GX80 Channel switching
  117. Hum / Buzz only when cord attached...
  118. Dropping Voltage at PT
  119. Current surge in a heater circuit.
  120. Boogie - cuts out
  121. Bandmaster AB763, please help this newbie diagnose, i have all voltage measurments...
  122. Ampeg SVT-4 PRO Volume Drop at Gain Peak
  123. Plate voltage rising on PR
  124. Bassman 100 help: screen resistors fried
  125. Clean Amp distortion problem?
  126. Crate GTX120 residual hum issue
  127. Crate GX130C guitar amp cuts in and out
  128. How to discharge filter caps?
  129. AC15 screen resistors
  130. Hotrod Deville squealing?
  131. Marshall VS265 Speaker Issue
  132. Carrotron Noise Fader
  133. 5150 Channel switching
  134. Fender Stage Lead problem
  135. Bandmaster ab763. Thump or "waa" sound when standby is disengaged.
  136. Recap question
  137. Need Transistor Sub For Kustom K200
  138. Newbie looking for help on 5E3 hybrid
  139. HRDlx very very low output after mods
  140. AC15 RI red plating, no audio
  141. Bad Reverb Tank???
  142. Rats in the Peavey
  143. Alamo Amp-5 Help
  144. Princeton Reverb (Blackface) problem
  145. ampeg gemini 2 weak reverb
  146. Time for my first recap - Advice sought
  147. Marshall JMP Standby Problem
  148. marshall tsl bias and hum problem
  149. Marshall DSL 401 Bridge Rectifier
  150. no crunsh sound but lot of noise with Mesa Boogie Mark 3
  151. Cant seem to figure this one out......Soldano designed Yamaha T50C
  152. Super Reverb
  153. BNC or Banana Jacks to 1/4 jack
  154. Trouble shooting Silvertone twin twelve, squeal
  155. Hartke 3500 problem
  156. 50's Rickenbacker M8 amp died today. Help!
  157. Advice needed- best way to lower plate voltage
  158. Trouble with Fender frontman 15g
  159. Problem with a plexi
  160. loud hum w/ my Mesa
  161. Crate V18 does anyone have schematic for the smps pcb?
  162. Ampeg BA115 Trouble Shooting
  163. Fried my Ampeg AX-70!?
  164. Peavey Classic VT tube problem
  165. KT88 Champ
  166. Sunn Model T cap job
  167. el-84 red plating
  168. Help with Peavy Classic 50 4*10
  169. Peavey Chorus 400
  170. peavy bandit reverb out.
  171. Crate vintage club 30 volume spikes?
  172. Which Bias Probe to get? Compu-Bias or ??
  173. Crate G10-XL info
  174. Power Tube Rattle
  175. Not sending to reverb on Traynor YCV20
  176. Fender Super 210, no clean channel, stays loud
  177. SVT short, OPT suspected.
  178. Line 6 AX2 repair help
  179. Ampeg SVT-5 Pro Misc Questions
  180. Test point input signal
  181. Bugera V22
  182. Help fixing my Mesa Boogie Mark IV
  183. Need help with a 1988ish Polytone
  184. Fender Frontman 65R - hiss when cable plugged in
  185. Bad OT affect bias, cause redplating?
  186. new combo smell is it normal
  187. Orange Rocker 30 volume in&out
  188. Acoustic B200 short problem.
  189. Diagnosis assistant
  190. How to wire this Hiwatt Custom 20 fix?
  191. PT hum in Orange OR 80
  192. 60Hz Hum in Mesa Boogie Triaxis
  193. Epiphone Galaxie 10 Power Transformer
  194. Dummy Loads??!
  195. 1970's Fender Princeton: No Sound
  196. How to not destroy pots when removing knobs???
  197. Ampeg Gemini II can cap values
  198. Delta Blues reverb op amp
  199. Help with Biasing a Bassman 5F6A
  200. Roc Pro 1000 stuck on disortion?
  201. Peavey Dual amp
  202. HiWatt DR201 Bias Problem
  203. Capacitor Failure
  204. Help for a complete new guy
  205. B-52 matrix 200 with no output.
  206. Sound Cuts From Marshall vs65r
  207. A power or volume drop on a Fender Supersonic
  208. Bad pots, Come on?
  209. What did I do wrong?
  210. Cornford Carrera - Crackling/hissing
  211. Mesa Boogie Duel rec. 3 ch. solo head with no power amp output
  212. Getting bias vltage from a non-centertapped secondary
  213. hartke 3500 power-on problem
  214. '84 Marshall 5005 Lead 12 power switch
  215. Tremolo Not Working-1972 Super Reverb
  216. fender stage 100 amp buzzing
  217. Laney becomes intermittent after two hours...
  218. Help with Carvin Legacy please - newbie
  219. Bassman 100 grid leak and bias Q's
  220. Hookup wire
  221. Noisy Princeton Reverb Clone
  222. Hot Rod Deluxe Master Pot
  223. Output wattage opinions?
  224. newbie help with marshall amp please
  225. '74 Pro Reverb with hum and reverb noise
  226. Removing powertubes and running
  227. Need Help with Fender Twin Reverb
  228. Power supply for a preamp
  229. need help with a resistor value
  230. Help with Marshall Please
  231. noise peavey classic 50
  232. Peavey XR 600E repairs
  233. nmv twin reverb vibrato
  234. Fender Twin-Amp Feedback
  235. Laney LC15 problem
  236. level dependant buzz/static
  237. 1964 Gibson GA17RVT "Scout" volume......
  238. Marshall 8004 Woes
  239. Trace Acoustic TA100R Schem.
  240. 1973 Princeton. Low volume.
  241. why is SFDR picking up more buzz than BF Bassman?
  242. Deluxe Reverb Stock Speaker Trouble
  243. Peavey Classic VTX
  244. Carvin BelAir - Low Voltage, Output, lot's of problems
  245. PREMIER AMPS B-160 and B-220
  246. My new Mesa Boogie Mark III Red Stripe
  247. Belgiums bitch
  248. Got a fender blues deville mexican, fixed a few problems but reverb feedsback bad.
  249. Marshall Haze 40C Tube 4 turns sign wave into hard very loud sq. wave to early,ideas?
  250. piezo preamp