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View Full Version : Maintenance, Troubleshooting & Repair



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  1. 5150iii channel two compressing
  2. Randall RG50TC problem
  3. how dangerous are floating ground amps (old Supro)
  4. volume loss Crate V32
  5. volume loss Crate V32
  6. Fender Stage 100 DSP
  7. Squire Champ 15/Fender Frontman 15(R)
  8. svt 4 pro going mute
  9. VHT Pitbull 50/12 Issues... Help!
  10. Peavey Studio 210
  11. B-52 AT100 very low volume/fuse blows when standby turned off
  12. Behringer GMX212 amplifier problem
  13. anyone have pic of cts alnico 10' speaker?
  14. Peavey Transtube Supreme Schematic
  15. Help me understand
  16. Channel 2 Fading Out
  17. 61 Reverberocket Reverb Problem
  18. More on Marshall TSL100
  19. Switched Tube Consequences?
  20. Can pulling tubes out one at a time help you locate hum?
  21. Burning 6L6 screen resistors
  22. Please help Marshall jmc 800 (2205) loud hum running out of things 2 look 4.
  23. Ampeg B4R Issue
  24. Replacement power transistors for old JC-120?
  25. Bridge Bad, Would You Replace Regulators?
  26. Diode question
  27. 59' reissue troubles, cracks and hisses
  28. Working Man's 12 blows fuse
  29. barcusberry 1601
  30. Mesa Express - Switching the transformer
  31. Wrong Transformer in Vibro Champ?
  32. Musicman 130 (2275-130) problems
  33. Locating loud hum/noise
  34. Damper diodes as rectifiers
  35. Fender Twin blowing fuses
  36. Fender Twin amp nasty buzz
  37. 16mm 10K Pot for line 6 source
  38. Marshall DSL 100 reissue - hum
  39. Isolation Transformer help
  40. 4x6L6 heater troubles
  41. G80rcd marshall
  42. 5F1 Distortion Like Blown Speaker
  43. Fender Hotrod Deluxe noice
  44. Acoustic 125 guitar combo issues.. no output!
  45. SS amp blues...
  46. Unknown orange PT wire
  47. Deluxe Reverb FAILED at gig!
  48. Peavey Classic30 troubleshooting help please
  49. Crate GFX 120 - Constant hum
  50. Ampeg GT10 Xsistor part number
  51. Help with hum in Vox AC15H1TV
  52. troubleshooting Ampeg B-15-N
  53. Trace Elliot lamp
  54. Hot Rod Deluxe...low volume, weird voltages
  55. Peavey Classic 50 2/12 question
  56. Bogner Alchemist
  57. Trace Elliot GP12
  58. Model T Reissue (Fender) w/ hole burnt in PCB... PT ok?
  59. Bassman 100
  60. SE 5F1-type bias ?
  61. Marshall JMP1 Preamp Clean Channel problem
  62. Fender Deluxe 900 static
  63. Vox AC4TV Buzz Problem
  64. 5F6-A Choke Problem/Questions?
  65. Faulty Laney VH100R
  66. Identify Vox capacitors?
  67. Power transformer gurgling
  68. crate TX50a limo
  69. Radio station coming in through Amp
  70. PCB Trace Repairs
  71. tech question on crate bx-100
  72. Vypyr, almost no low end... mods?
  73. marshall mg100 hdfx mute circuit ??
  74. farty bass problem, Bassman 10
  75. Mackie SWA1501
  76. Problem Behringher PMP 1280s
  77. Sunn Col 300 one thing after another...
  78. Fender red-knob "85" Cracks up.
  79. peavey triumph 60 lost gain channels
  80. Behringer MX 3282A mixer, no output
  81. Super Reverb Bias?
  82. Bad Buzz
  83. Marshall JCM 2000 DSL bias help
  84. Peavey Transtube EFX 212 Lost Balls, static distortion
  85. Ampeg SVT Classic - How Much Background hum is "normal"?
  86. Mesa Heartbreaker Head
  87. no sound from an AB763 clone
  88. Ampeg SVT4 Pro repair
  89. Bias adjustment SFSR
  90. Repairing an old Crate VC-3112W
  91. Can you guys help me understand what happened here?
  92. replacement power transformer for Spectra 212-T?
  93. Shielding question
  94. Neve pickup/preamp system dead
  95. vibro champ tone controls problem
  96. Marshall MG100HDFX Question
  97. DRRI & intermittent problems
  98. selmer trebble and bass 50r sv crackling sound and treble channel down
  99. Killed my Fluke 87 III
  100. Bias for AMPEG SVT 3 pro
  101. Broken volume pot on Valvestate 8080
  102. RCA 40409 & 40410 Transistors
  103. Acoustic 370 blows internal fuse when turned on
  104. EV 1.0kW
  105. Cliff jack nut thread/diameter?
  106. Hartke Model 2000 Repair
  107. boogie mk iv graphic
  108. Fender Twin PT Wires
  109. 68 bandmaster bass pot does nothing bass has disapeared
  110. Ampeg M15 hum
  111. Need supplier for Vox AD50VT PT
  112. Crate G40C will not switch channels!
  113. Mesa 2:90 Voltage Chart
  114. Anyone repair reverb tanks ?
  115. Steelphon GA810 Unknown fuse value
  116. Crate Vintage Club 50 Fixed/Cathode Bias Mod help
  117. How to bias a Silvertone 1482
  118. Reverb hum Valvestate VR65
  119. B-52 AT112 Repair Help
  120. Fender Hot Rod DeVille 212 screeching problem.
  121. high-pitch squeal
  122. Hum Help
  123. Marshall re-issue
  124. Gallien Kreuger 200mv
  125. New (old) amp dilemma....??
  126. Trying to fix loss of volume in a 1978 Randall RG300 Head (SS)
  127. Fender Silverface baffle trim material available for sale?
  128. Bass amps and fuzz pedals... OUCH
  129. Lonestar Special blows fuses
  130. Hum on blackface deluxe that goes when normal channel Vol 2/3 up???
  131. Fender FM212R Squeals at 4ohms, but not 8?
  132. crate limo TX-50D not working
  133. Bad Cat problem/questions
  134. Clean channel clipping low notes
  135. I've really done it this time
  136. Mesa Rocket 44 bias circuit mod?
  137. Blowing rectifier tubes
  138. Marshall EL34 100/100 Poweramp schematic
  139. debugging old peavey blues classic
  140. Heater pulsing normal?
  141. Fender Pro Jr Schematic Question
  142. questions about floating paraphase inverters
  143. Troubleshooting Selmer T'n'B Mk III
  144. Hot Rod Deville Bias Runaway
  145. Testing Mosfets in circuit
  146. Bad Buzzing in SF Bandmaster Reverb
  147. HUM preamp heater short?
  148. Fender '94 Twin Amp Noise...
  149. Nomination: Worst fuse holders ever
  150. Acoustic Control Corporation TO-220 transistor identification
  151. GK 600B resisto-roast
  152. Blue Glow Question
  153. Gibson EH-150
  154. AC30CC repair help/advice
  155. jcm 2000 dsl blowing tubes!
  156. Amp ticking
  157. Need specs. for Line 6 Amp
  158. Mesa Boogie Mark IV tube problem?
  159. Hiwatt custom 20 tube 60 hz hum ideas?
  160. Fender Performer 650
  161. ESR Meter / Tester
  162. hot air desoldering reflow station
  163. Peavey Triumph cuts out until it warms up.
  164. Peavey Classic 20 - Oops
  165. Ampeg SVT4 Pro failure
  166. Good Work Surface
  167. Another Problem with another Peavey Classic VTX 212 65 Watts
  168. I need schematics for crate stealth 50
  169. Marshall MG100HDFX low on volume.
  170. Fener BXR300C hum
  171. How do I internally join inputs in a plexi-style circuit ?
  172. noise noise noise
  173. Marshall AVT150H Blowing Fuses
  174. Berhinger PMP 5000
  175. Help with channel switching on the dreaded JCM2000DSL 100
  176. Tubes Help
  177. Peavey Combo 300 no output
  178. Ampeg v2 red plate help!
  179. Crate VC50 hot tranny/slight hum...
  180. Carlsbro 60 watt twin channel
  181. Stagepas 300
  182. Marshall JCM 2000 Super Lead - won't turn on
  183. Fender HR DeVille probs...
  184. Best High Current Connector
  185. Marshall Specialist tremolo not working
  186. Some info. On Line 6 AX2?
  187. Super Reverb Attempt to Clone with ugly distortion
  188. Sunn 300T signal gain
  189. Crate VC-3112 stuck on B channel. Help please.
  190. Crosstalk channel bleed trouble shooting
  191. Marshall AVT150H Repair help needed.
  192. "The Twin" Fender Amp bias adjust
  193. Crate V-100h Head Died
  194. Bugera Problem
  195. Dean Markly CD-30 Tube Amp has me baffled...
  196. Roland JC 120 effects loop
  197. Fender Performer 1000 problems
  198. Behringer PMH2000 schematic
  199. princeton: polarity switch modded for standby?
  200. fender amp problem
  201. another Hartke Overheating Post
  202. Laney AOR 100w first series, 505 volts on the plates ?
  203. jtm30 bias mod problem
  204. Marshall VS100 combo - occassional overpowering buzz
  205. Fender Transformer Problem
  206. Music man 2275-65 ss phase inverter issue?
  207. Ampeg SVT II Pro - help needed
  208. Ampex ATR-700 trim pot
  209. marshall 8080 low level hum
  210. Reverb tank for Kustom 50
  211. Marshall JCM 900 4100 Fading
  212. I can't fix anything for finding more stuff
  213. 5150 Power board problem
  214. hartke LH1000
  215. Massive hum - B-15N
  216. Super Reverb cooks Reverb Driver 12AT7
  217. Laney amp problem
  218. Sunn 300T replacement pot?
  219. Acoustic 470 Guitar/Bass amp
  220. Dead PT
  221. Why does the Pro Jr sound so much thinner than a Princeton Reverb ?
  222. Twin Reverb 15 Popping/crackling on startup
  223. Peavey XXL cutting in/out
  224. SWR LA15 complete schematics
  225. tantalum replacement in Kustom 200
  226. Marshall MG50DFX No sound from main input
  227. On tour in Europe, need help with Sunn 300T
  228. Tube Amp Hum, No Sound
  229. Carvin R1000 Bass Amp Poroblem
  230. Help! Can't rock until this is resolved!!
  231. trying to chase and kill hum in tube echo and reverb
  232. Fender Bullet problems
  233. Rivera Knucklehead switching problems
  234. Mesa Bass 400 preamp voltages WAY too high!?
  235. Peavey session 400 (210 Watts) Capacitor Problem!
  236. Peavey Bandit loud popping
  237. Noise problems with new Vox AC100CPH Classic Plus
  238. Large Radial Caps
  239. How to measure bias in a Fender Pro Junior (1ohm resistor)
  240. another noisy Silvertone 1484
  241. Ampeg SVT-VR&CL popping intermittently
  242. Reverb Tank Suitable Replacement - Acc. Type 1 Tank
  243. Super Beatle Caps Question
  244. volume problems with a first amp build
  245. Ampeg SVT-VR&CL ground loop hum solution
  246. 5E3 kit - preamp hum
  247. Intermittent, volume independent crackle on Fender Deluxe Reverb (w/ mp3)
  248. Ampeg V7 reeverb problem
  249. 5150 Screen Grid RESISTOR/Tube question...
  250. SF Bassman 100 hum problem