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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Hello Classic 30 question.
  2. Setting bias on a Ampeg SVT 4 Pro
  3. Cap Replacement...Which caps to use
  4. Lonestar Special 5w & 15w fade out
  5. Marshall DSL 100, loudspeaker out, 16 ohms ok but parallel 4,8 ohm no sound
  6. Lab Series L4 Bass Head 200 watts, IC sub for CA3094ae Op Amp
  7. Popping/Crackling Blues Jr on Startup
  8. vibro champ
  9. Please help with my Peavey Classic 50!
  10. Peavey Renown Problem
  11. Fender Twin Reverb-less 65 RI
  12. Musicman 2100 RD line out?
  13. Thank you to the kind contributors here
  14. help me put humpty together again(Sound City Content)
  15. Fender Blue Deluxe Problem
  16. Distorted Reverb- SF Super Reverb
  17. Fading Marshall
  18. I don't think tube amps are supposed to emit smoke....
  19. Removeing the groundswitch in a Fender ab763
  20. B-52 AT100 head trouble
  21. Walter Woods parts
  22. Ampeg v4 bias supply issue
  23. Relays in Marshall TSL 100, channel switching issues
  24. Carvin BelAir troubles
  25. Roland JC-77 noisy Chrous OFF mode
  26. Roland Cube 60 Chorus CH60 - Help Chorus broken!
  27. Marshall valvestate vs65r loud pop
  28. Heater wiring for 6CG7 tube
  29. Mesa Boogie Rect-o-verb
  30. Anyone know the B+ Voltage of Marshall DSL401
  31. Randall pro-tube 2000 no sound. HELP!
  32. big trouble in home brew
  33. Problem with Laney TT100H
  34. randall rg50tc advertised as el34's sold with 5881's???
  35. Effects Loop Bleed Issue
  36. Marshall MG100 HDFX Burnt IC1
  37. GK 400RB blowing fuse on start-up
  38. Epiphone Galaxie 25
  39. Low volume issue
  40. Kustom 250 Fuzz issue
  41. Triaxis Troubleshooting
  42. Peavey kb 100 speaker replacement.
  43. Need a little help guys
  44. B-52 AT100
  45. Q: 1986 Marshall - troubleshooting
  46. stood on lead roland cube 20 dead. Help please
  47. Beginner advice
  48. Epiphone triggerman speaker?
  49. BF Showman Driver Stage Hum
  50. Trouble with Ampeg V-4
  51. BF Bandmaster rebuild troubleshooting
  52. Ruby Reverb spring repair
  53. OT Shunt biasing question...
  54. Fender FM212R Reverb Failure
  55. Yamaha T50C Soldano Overdrive Hum
  56. Need to install grounded power cable - advice
  57. 5E3 serious crackling
  58. Crate GX80 Channel switching
  59. Hum / Buzz only when cord attached...
  60. Dropping Voltage at PT
  61. Current surge in a heater circuit.
  62. Boogie - cuts out
  63. Bandmaster AB763, please help this newbie diagnose, i have all voltage measurments...
  64. Ampeg SVT-4 PRO Volume Drop at Gain Peak
  65. Plate voltage rising on PR
  66. Bassman 100 help: screen resistors fried
  67. Clean Amp distortion problem?
  68. Crate GTX120 residual hum issue
  69. Crate GX130C guitar amp cuts in and out
  70. How to discharge filter caps?
  71. AC15 screen resistors
  72. Hotrod Deville squealing?
  73. Marshall VS265 Speaker Issue
  74. Carrotron Noise Fader
  75. 5150 Channel switching
  76. Fender Stage Lead problem
  77. Bandmaster ab763. Thump or "waa" sound when standby is disengaged.
  78. Recap question
  79. Need Transistor Sub For Kustom K200
  80. Newbie looking for help on 5E3 hybrid
  81. HRDlx very very low output after mods
  82. AC15 RI red plating, no audio
  83. Bad Reverb Tank???
  84. Rats in the Peavey
  85. Alamo Amp-5 Help
  86. Princeton Reverb (Blackface) problem
  87. ampeg gemini 2 weak reverb
  88. Time for my first recap - Advice sought
  89. Marshall JMP Standby Problem
  90. marshall tsl bias and hum problem
  91. Marshall DSL 401 Bridge Rectifier
  92. no crunsh sound but lot of noise with Mesa Boogie Mark 3
  93. Cant seem to figure this one out......Soldano designed Yamaha T50C
  94. Super Reverb
  95. BNC or Banana Jacks to 1/4 jack
  96. Trouble shooting Silvertone twin twelve, squeal
  97. Hartke 3500 problem
  98. 50's Rickenbacker M8 amp died today. Help!
  99. Advice needed- best way to lower plate voltage
  100. Trouble with Fender frontman 15g
  101. Problem with a plexi
  102. loud hum w/ my Mesa
  103. Crate V18 does anyone have schematic for the smps pcb?
  104. Ampeg BA115 Trouble Shooting
  105. Fried my Ampeg AX-70!?
  106. Peavey Classic VT tube problem
  107. KT88 Champ
  108. Sunn Model T cap job
  109. el-84 red plating
  110. Help with Peavy Classic 50 4*10
  111. Peavey Chorus 400
  112. peavy bandit reverb out.
  113. Crate vintage club 30 volume spikes?
  114. Which Bias Probe to get? Compu-Bias or ??
  115. Crate G10-XL info
  116. Power Tube Rattle
  117. Not sending to reverb on Traynor YCV20
  118. Fender Super 210, no clean channel, stays loud
  119. SVT short, OPT suspected.
  120. Line 6 AX2 repair help
  121. Ampeg SVT-5 Pro Misc Questions
  122. Test point input signal
  123. Bugera V22
  124. Help fixing my Mesa Boogie Mark IV
  125. Need help with a 1988ish Polytone
  126. Fender Frontman 65R - hiss when cable plugged in
  127. Bad OT affect bias, cause redplating?
  128. new combo smell is it normal
  129. Orange Rocker 30 volume in&out
  130. Acoustic B200 short problem.
  131. Diagnosis assistant
  132. How to wire this Hiwatt Custom 20 fix?
  133. PT hum in Orange OR 80
  134. 60Hz Hum in Mesa Boogie Triaxis
  135. Epiphone Galaxie 10 Power Transformer
  136. Dummy Loads??!
  137. 1970's Fender Princeton: No Sound
  138. How to not destroy pots when removing knobs???
  139. Ampeg Gemini II can cap values
  140. Delta Blues reverb op amp
  141. Help with Biasing a Bassman 5F6A
  142. Roc Pro 1000 stuck on disortion?
  143. Peavey Dual amp
  144. HiWatt DR201 Bias Problem
  145. Capacitor Failure
  146. Help for a complete new guy
  147. B-52 matrix 200 with no output.
  148. Sound Cuts From Marshall vs65r
  149. A power or volume drop on a Fender Supersonic
  150. Bad pots, Come on?
  151. What did I do wrong?
  152. Cornford Carrera - Crackling/hissing
  153. Mesa Boogie Duel rec. 3 ch. solo head with no power amp output
  154. Getting bias vltage from a non-centertapped secondary
  155. hartke 3500 power-on problem
  156. '84 Marshall 5005 Lead 12 power switch
  157. Tremolo Not Working-1972 Super Reverb
  158. fender stage 100 amp buzzing
  159. Laney becomes intermittent after two hours...
  160. Help with Carvin Legacy please - newbie
  161. Bassman 100 grid leak and bias Q's
  162. Hookup wire
  163. Noisy Princeton Reverb Clone
  164. Hot Rod Deluxe Master Pot
  165. Output wattage opinions?
  166. newbie help with marshall amp please
  167. '74 Pro Reverb with hum and reverb noise
  168. Removing powertubes and running
  169. Need Help with Fender Twin Reverb
  170. Power supply for a preamp
  171. need help with a resistor value
  172. Help with Marshall Please
  173. noise peavey classic 50
  174. Peavey XR 600E repairs
  175. nmv twin reverb vibrato
  176. Fender Twin-Amp Feedback
  177. Laney LC15 problem
  178. level dependant buzz/static
  179. 1964 Gibson GA17RVT "Scout" volume......
  180. Marshall 8004 Woes
  181. Trace Acoustic TA100R Schem.
  182. 1973 Princeton. Low volume.
  183. why is SFDR picking up more buzz than BF Bassman?
  184. Deluxe Reverb Stock Speaker Trouble
  185. Peavey Classic VTX
  186. Carvin BelAir - Low Voltage, Output, lot's of problems
  187. PREMIER AMPS B-160 and B-220
  188. My new Mesa Boogie Mark III Red Stripe
  189. Belgiums bitch
  190. Got a fender blues deville mexican, fixed a few problems but reverb feedsback bad.
  191. Marshall Haze 40C Tube 4 turns sign wave into hard very loud sq. wave to early,ideas?
  192. piezo preamp
  193. Vibro Champ not Vib-ing
  194. Deluxe Reverb Reissue Hum Issue
  195. Kustom 150 power supply 50% high
  196. Vibro Champ from parts... B+ voltage low, 155v
  197. Fender Footswitch trouble
  198. Amp Hiss
  199. AC30 TB/6 Vib/Trem Controls
  200. VOX AD100VT Troubleshoot
  201. plugging 8 ohm speaker into super reverb
  202. PV XXX channel sw problem
  203. Deluxe Reverb Power transformer - 0990761
  204. buzzing amp
  205. Mode Four smokin' but with real smoke!
  206. Ampeg SVT4-Pro Problems
  207. Peavey 130 Hum
  208. Crate Vintage Club 50 Head Is Hissing and Crackling
  209. trouble with ashdown evo2 300 and trace elliott gp7 amp heads
  210. Fender Squier 15 input jack
  211. Peavey Vypyr 15
  212. mesa problems
  213. Behringer ULM2000 microphone
  214. switch for an Ibanez TS9
  215. 5V4 in Champ
  216. Testing an output transformer
  217. CS800 Proper Schematic
  218. Hiwatt 200 problems
  219. Old Pro Reverb
  220. Help with output transformer
  221. Roland cube 100 guitar amp- loss of power
  222. Marshall g100rcd smoke checked?
  223. Is this "Crossover Distortion"?
  224. rattle in GT EL84s, again!
  225. Fender Showman output?
  226. Yamaha T100C
  227. Peavey Stereo Chorus 400 footswitch circuit needed.
  228. Marshall MHZ40C - Buzzing
  229. My Classic 30 DIED!!!
  230. Behringer GMX110 fried power amplifier
  231. Echoplex EP2 Hum
  232. How I "safely" use 2-prong amps until I change to 3-prong!
  233. Low voltages in 1972 Orange Graphic 80
  234. Need help! channel and crunch switch not working!!!
  235. need diagnosis help for dead amp
  236. Bridge rectifier issue...
  237. Mig-50 PI type parasitics after a few hours
  238. Fender Princeton Chorus
  239. Peavey Bass 400 m3 DC on Output
  240. Ampeg B-15T distortion
  241. Unidentified Model
  242. peavey 5150 sounds bad
  243. Vibro Champ Rebuild - Plate voltage high
  244. Bugera 333xl sounds bad suddenly
  245. Crate GTX212 Squeals on power up
  246. Crate PX-600 Whistles when turned off
  247. G1 amp in a Case
  248. Fender Frontman 15G 60hz Hum
  249. Peavey Vypyr 15 problems
  250. Carlsbro top 50 OT installation