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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Slo Clone LDR switching issues
  2. Mesa Boogie Dual Rectifier 2 channel - Distorted clean sound
  3. Anyone have a schematic for a Fender solid state Bassman Compact
  4. Marshall 1959HW 100W Plexi Oscillation
  5. Marshall 6100 noise
  6. Is it possible and/or likely for a preamp tube failure to cause a mains fuse to blow?
  7. Peavey Classic 30 Hum
  8. Blackface Vibrolux Clone - Static from both (new) volume pots
  9. Weird values in heater virtual ground? SF Princeton Reverb
  10. Peavey Triumph 120 head - power tube board is burnt
  11. Egnator rebel 30 channel switching problem
  12. Fender Bassman 1200 output problem
  13. Marshall VS65
  14. national glenwood model 90
  15. new 65 DRRI reverb issues
  16. tiny terror tranny?
  17. Marshall VS102R Footswitch Issue
  18. SWR Workingman's 12 - guts pic needed
  19. Behringer vt100fxh not powering on.
  20. Marshall DSL 40C tone stack
  21. Need help with Crate Blue Voodoo 6212
  22. Ampeg SVTCL
  23. Low voltage on plates of Traynor YCV40
  24. bias?
  25. Marshall JCM 2000 60W HELP!!
  26. Don't fix it if it ain't broken...
  27. Changing output valves TCT100H
  28. Marshall JTM30 bias mod problem & IC3 (LM348) problem
  29. Peavey Valveking 100 Head
  30. Fender 65 Princton Reverb bias problem
  31. TrampTraceElliotPotentiometers
  32. Hartke HA5500 troubleshooting
  33. JCM800 decoupling/grounding/oscillation/normal phenomenon
  34. Mackie CFX 20 Mk2
  35. Marshall VS65R - amp powers on but no sound
  36. Epiphone Valve Senior problem
  37. Roland Micro Cube IC
  38. Fender "the twin" hum
  39. Peavey Windsor Studio popping noise
  40. Help with Mesa Boogie Maverick Dual Rectifier head
  41. Harmony H306: no output
  42. Tune up advice for 65 VibroChamp
  43. Randall bass amp
  44. DSL PT physical hum
  45. SWR 750x problem
  46. What do you use for screening foil
  47. Stumped by a scratchy pot
  48. Making Assumptions
  49. Lateral Mosfets
  50. Intermittent output Fender Vibrolux Reverb
  51. Crate VTX200s Assistance
  52. B52 AT212 gain switch not working
  53. New build - 5E7 - Bias Question
  54. Vox aga150
  55. SF MV Twin Reverb - Noisy vibrato channel troubleshooting advice
  56. Need Help with 5150-III 50W channel switching problem
  57. Ampeg SVT-VR CH 2 Buzz Help
  58. Reverb oscillation in SF Pro Reverb (Master Volume)
  59. Marshall JMP MKII non master volume
  60. Carvin X60B help.
  61. Eden WT800 bridged mono not inverting
  62. Need help with Fender Ultimate Chorus - one amp side dead
  63. Boutique blowing fuses
  64. behringer eurorack ub2442fx-pro
  65. peavey 6505 + 112 lead channel noise / previous board repairs.
  66. RG - One Spot
  67. Gallien-Krueger MB500
  68. Tascam 688
  69. JC-80 bad transformer and where to get one
  70. 5C2 princeton clone build
  71. Reverb Tank bobbins - good question for Juan?
  72. Allen accomplice making intermittent chirping and static
  73. 100Hz Hum diagnosis
  74. Ampeg BA 210 combo bass amp help please
  75. Marshall 5275 Reverb Problem
  76. Silvertone Twin Twelve 1484 - Intermittant Reverb Squeal if Rev Depth Knob Turned On
  77. Fender Deluxe 112 bad signal after replacing tip142 & tip147
  78. Wem Dominator Bass amp Problems
  79. Tsl 602 pops fuse when turned off
  80. Single Rectifier - Burnt Resistors in V1 Preamp Stage
  81. Noise after recapping tube amp
  82. Oscilloscope For Amp Maintenance?
  83. Blues Deville switching stuff....oh boy....
  84. Peavey Triple X leaking electrolyte
  85. Marshall DSL 100H
  86. Ampeg SVT-350T
  87. EC Tremolux Service Manual
  88. Ampeg BA115HP speaker popping
  89. Fender deluxe 112 Plus. Really hot but sounding fine?
  90. Randall part #
  91. Peavey VTM 60 Clean Channel?
  92. Peavey Classic VTX
  93. line 6 spider iii 15 no Power
  94. Acoustic Model 115 - Reverb Not Working
  95. Spider Valve HD100 input/codec board burnt
  96. Peavey Heritage VTX, no sound output
  97. DV Mark DV40 112 40W Combo Reverb Volume Issue
  98. Sound City 30C Mark 6 - occasional soft motor boating
  99. Hartke HS 1200 bass amp transformer needed
  100. New 2203 pops
  101. Think I just blew my power transformer
  102. Marshall SL5
  103. Behringer LPA1180 Power supply in short
  104. KMD XV100SD Tube Amp has FX Loop problem - please help
  105. Reverb isolator replacement for Gibson Saturn amp
  106. Lost inside Acoustic G120 2x12 (Model 127)
  107. Vox channel switch pop
  108. stabilizing an amp
  109. 73 Vibro Champ : No Sound
  110. Fender Deluxe 112 plus bad buzz
  111. How do I tell the different primary wires in a power tranny?
  112. Peavey Heritage VTX driver checking?
  113. Sunn Sentura II - Cap PolarityQuestion
  114. Thermal Switch Kicking On/Off (Peavey XR-600B series 400HB)
  115. New KT66 opinions
  116. Crate GT1200H Effects Insert
  117. Weak/Distorted Sound from old Roland Cube 40 (Orange)
  118. .How much tolex will you need to covered cabinet
  119. 65 Fender Twin Reissue crackles at high volume
  120. Early 70's Fender Princeton
  121. Crate GT1200H Volume Loss after 20-30 min's
  122. Ampeg SVT-3 Pro - starts up - then fan cuts out before relay switches - no output.
  123. Crate V50
  124. Effiective ways to test multi section cap can?
  125. Laney GH50L hum
  126. Ceriatone JTM45 blowing mains fuse
  127. Behringer k3000fx blowing fuses
  128. AIDEAN MESIA 100 troubles with hum and reverb
  129. Anyone need a tre' bitchin' dummy load?
  130. Carvin Sx-200 blown switching power supply
  131. '62 JMI era Vox AC30 rebuild help!
  132. Peavey original Backstage schematics
  133. Conductive Fibre Eyelet Board? Vintage Fender
  134. Marshall 40th Anniversary Super 100 JTM 45/100 hums.
  135. Troubles Finding This Part
  136. QSC PWM IC
  137. parallel caps in Marshall curcuit
  138. Ampeg SVT-II (non-pro) craps out after a few minutes
  139. 1965 Supro Amp
  140. Princeton crackles when I play chords
  141. fender pro junior mod failure
  142. Bias mod Peavey VTM 60
  143. newer fender octave BS
  144. Drip Edge '69 Deluxe Reverb Chassis pic for your consideration
  145. Low gain vs. high gain tubes
  146. bassman burnout
  147. Redmere Soloist in a bushel basket
  148. Assistance replacing an impedance selector on Vintage Marshall JCM 800
  149. Mesa Studio 22 Caliber Plus issues
  150. rex branded Valco 6143 amp w/no power transformer
  151. Fender Blackface Tremolux RED HOT
  152. OH no this amp is so clean!!
  153. Mojo 5E3 bias (heat?) issues...
  154. Vox AC30-6/TB with Loud Xfmr Mechanical Hum
  155. Bose Acoustic Wave Radio AWRCC2 Noise
  156. Chicago Blues Box - blowing tubes
  157. RC4739DB substitution
  158. Laney VC30 Porblems
  159. measuring output power
  160. Super Champ XD Red light on. Channel select light off. No Sound.
  161. Laney AOR series 2 100 watt/Laney pro-tube 50 watt
  162. JMI VOX AC30 Motor Boating on Normal Channel - Help
  163. Crackling/buzzing with higher volumes in a Carvin X100B combo.
  164. Top Boost preamp anomaly Q
  165. Pwavey CS800X
  166. Ampeg PF500
  167. Roland JC 77 reverb issue
  168. Orion Lasers
  169. HI new to the group.
  170. SF Vibro Champ, no vibrato
  171. 6L6 tubes for Peavey Deuce?
  172. Crate VC3112 clean channel noise
  173. Ampeg B15 with dreadful hum Help
  174. Mircophonic SS amp?
  175. 6L6 tubes
  176. 59 Fender Super amp, replaced PT heater question
  177. Hartke 10" replacement suggestions?
  178. 100w valve head cutting out
  179. Princeton Reverb clone tremolo intensity help
  180. Tips to remove stuck chassis from cabinet?
  181. Noisy pots
  182. B-52 AT-100, won't power on... please help!
  183. Dean Markley CD120
  184. Hartke A100
  185. Loud Hum in 1974 Twin Reverb
  186. Laney dp100 bass amp disaster
  187. Old Gretsch Amp - need schematic and advise
  188. fender Prosonic 22 hum problem
  189. Need some hel retrofitting new PT into 70's Dual Showman Rvb
  190. Deluxe Reverb RI - Buzzin'!
  191. Marshall MG50DFX no sound on CD, main input, or FX return.
  192. Soundcraft EFX8 vs heavy falling object
  193. OR120 Pix Only Help!
  194. Servicing noisy pots on late Fender Pro Reverb Amps---PCB removal insanely difficult
  195. Need advice replacing some caps in old tube amp
  196. VOX AC15 virtually no output (volume) even with volume all the way up
  197. Crate BX-25 Intermitent Volume levels
  198. Harmony H406 distorted Really low output
  199. GK800RB Pwr Transformer question
  200. GK 250ML speakers
  201. Crate Taxi TX15 battery full but dosent work
  202. Frontman 212R Power Amp Problem
  203. Bassman 50 volume issue
  204. Marshall valvestate 8080 repaired?
  205. Peavey Vypyr 75 blown fuse
  206. Marshall JCM 2000 DSL 100 - tubes red-plating
  207. Have the problem with Fender Passport 500pro
  208. JCM2000 DSL 100W Head issue resolved!
  209. Carvin vt112 low output
  210. Fender The Twin Resistors?
  211. Engl Fireball 60 crackling on warm up
  212. I don't know how you guys do it!
  213. Kustom K100-2 reverb problem
  214. Gallien Krueger 200MB - Low voltage at rectifier
  215. Fender Super Reverb silverface Hum
  216. Power Problem Maine Amp
  217. 1948 Fender Champion 800 no output
  218. Bugera 333 Hum and radio station
  219. Which model Boogie is this?
  220. Fender Hot Rod Deluxe snap , crackle , pop ...
  221. fender hrd speaker blown
  222. Harmony H500 AC cord mod
  223. Marshall mg50dfx
  224. NPN Transistor question
  225. Peavey Classic 400 Tube Bass Amp - Preamp issue
  226. Gibson Vanguard GA77RVT Troubles - Reverb on Normal Channel
  227. Peavey XR600E (Dead)
  228. Power Transformer - Rivera-era Fender Concert
  229. Peavey Folded Line Reverb Tank
  230. Silvertone 1431 6AU6 Screen Grid Trimmer
  231. XLR/1/4" combo jacks for QSC
  232. Help a novice finish a vox 15r pot repair
  233. Interference from EOP devices
  234. Twin Reverb Issue
  235. Proper way to test a Power Transformer after an amp meltdown?
  236. Peavey CS-800x power board circuit short
  237. DOD 831 II Graphic Eq. Will someone help to troubleshoot this dead unit ?
  238. AC power test setups and tools; GFI as a tester
  239. SVT CL brief buzz coming out of standby
  240. hot rod deluxe PT voltage?
  241. Hartke LH500 Protection Circuit
  242. Pickup issue
  243. SVT 3 PRO - hum
  244. Peavey Valveking VK212 100W Combo: No Tube Power
  245. Fender DRRI reverb problem suspect footswitch please help going crazy!
  246. Sope question
  247. Ensoniq SQ-80 losing polyphony voices
  248. loud intermittent humming problem
  249. Carvin X100 speaker fuse
  250. Traynor YGM-3 Reverb Fail