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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Fuse Pops - Transformer Dead
  2. Orange rockerverb owners?
  3. Lafayette (or Univox??) U-80A mystery amp
  4. identify a transformer
  5. Bassman 100 - Should it be louder?
  6. Super Champ XD
  7. Amp Tech Needed in So Cal...
  8. Fender Princeton Chorus problems
  9. Marshall MG100dfx
  10. Marshall Super lead 1959 Problem
  11. JTM45 Build Buzz Problem
  12. Svt 4 pro tubes??
  13. Question about Marshall Valvestate 8100
  14. Marshall JMP 50 watt bias
  15. Traynor yvm-1 voice master acting funny - - -
  16. Fender Concert II problem ( preamp)
  17. Sticker on power tubes? Harmful?
  18. Need pot volume control for op pro preamp Ovation Guitar
  19. Marshall AVT150 Blown Fuses
  20. Diodes for a Twin
  21. Hiwatt Classic 50 Crackling when cranked
  22. NOS 6L6 vs Currently made 6L6
  23. More failed Jamicon 12,000u 80v
  24. Fender Super Reverb AA763 Bias
  25. marshall 8080 pot problems
  26. Need help with Fender Twin Reverb
  27. Vibrolux low volume
  28. Slightly off topic, but strange
  29. High voltage on pin 1 of V5 in '67 Super Reverb
  30. Powering vtl5c1 from heaters on SLO 100 ?
  31. Fender Twin loud reverb hiss
  32. Awful noise from Fender Bantam Bass
  33. power noise parkg10r amplifier
  34. HomeBrew Troublshooting Help
  35. Silvertone 1484 help needed
  36. PEAVEY BRAVO 112 crunch channel bad switch?
  37. 78 Crate CR-1R, 72 Gibson G20, 2006 Randall RG 100 G3 100 watt valve dynamic
  38. Ampeg svt cl hum issues
  39. Polytone Mini Brute lll, lV, M-PA
  40. Need help trouble shooting peavey xl-500 mix amp
  41. Serious ?grounding? problem - kind of scary...
  42. Silvertone 1484 diode substitutes
  43. Trouble with Peavey Backstage 110 amp
  44. '67 Ampeg Jet, no trem & high voltage
  45. Buzz/click!-dead when switching off standby
  46. New Matamp schems
  47. Where to get replacement parts for a Fender Twin Reverb?
  48. Phase linear 700b help!
  49. Complete newbie to amp repair
  50. Peavey TNT Fuse blowing
  51. Park G10 amp at 4Ohm Speaker?
  52. Need schematic for a Crate VC6112
  53. Crate Blue Voodoo 120H acting up:
  54. Mesa DC-5, Massive Hum on Clean Channel
  55. My gibson amp
  56. Peavey Classic vtx series- Troubleshooting repair help needed!!!
  57. fender studio lead amp problem
  58. Dear god not the Selmer again... & PPIMV...
  59. Peavey VT Classic 212 Broken Phase Help
  60. Yamaha G50-112 owners manual wanted
  61. marshall atv100 have no distortion?
  62. Palomino V8 loud hum.
  63. 5e3 volume interaction
  64. SWR workingmans 15 Frying resistors
  65. 59 Bassman reissue cuts out after 10 minutes
  66. Crate Vintage 30
  67. peavey 5150 212 won't power on
  68. SVT 350 XLR out HUM
  69. 65 Twin Reverb Vibrato Problem. Please Help
  70. Ampeg SVT-6PRO death & resurrection
  71. Sunn Sceptre
  72. Blue Voodoo clean channel hiss without volume
  73. Peavey Ultra switching pops
  74. peavey400bh
  75. Princeton speaker rattling in the breeze
  76. solder type ????
  77. Randall RG200
  78. Fender Pro Tube Pro Reverb - Dead Tremolo and Noisy Reverb
  79. Fender Bassman
  80. Ampeg VL502 problem
  81. Power xfrmer wire color? Help!
  82. Could someone explain how this amp was working?
  83. fender stage 100 dsp 112 combo
  84. Peavey KB60 acting up
  85. overheating resistors
  86. please tell me its not a crate
  87. 5150iii channel two compressing
  88. Randall RG50TC problem
  89. how dangerous are floating ground amps (old Supro)
  90. volume loss Crate V32
  91. volume loss Crate V32
  92. Fender Stage 100 DSP
  93. Squire Champ 15/Fender Frontman 15(R)
  94. svt 4 pro going mute
  95. VHT Pitbull 50/12 Issues... Help!
  96. Peavey Studio 210
  97. B-52 AT100 very low volume/fuse blows when standby turned off
  98. Behringer GMX212 amplifier problem
  99. anyone have pic of cts alnico 10' speaker?
  100. Peavey Transtube Supreme Schematic
  101. Help me understand
  102. Channel 2 Fading Out
  103. 61 Reverberocket Reverb Problem
  104. More on Marshall TSL100
  105. Switched Tube Consequences?
  106. Can pulling tubes out one at a time help you locate hum?
  107. Burning 6L6 screen resistors
  108. Please help Marshall jmc 800 (2205) loud hum running out of things 2 look 4.
  109. Ampeg B4R Issue
  110. Replacement power transistors for old JC-120?
  111. Bridge Bad, Would You Replace Regulators?
  112. Diode question
  113. 59' reissue troubles, cracks and hisses
  114. Working Man's 12 blows fuse
  115. barcusberry 1601
  116. Mesa Express - Switching the transformer
  117. Wrong Transformer in Vibro Champ?
  118. Musicman 130 (2275-130) problems
  119. Locating loud hum/noise
  120. Damper diodes as rectifiers
  121. Fender Twin blowing fuses
  122. Fender Twin amp nasty buzz
  123. 16mm 10K Pot for line 6 source
  124. Marshall DSL 100 reissue - hum
  125. Isolation Transformer help
  126. 4x6L6 heater troubles
  127. G80rcd marshall
  128. 5F1 Distortion Like Blown Speaker
  129. Fender Hotrod Deluxe noice
  130. Acoustic 125 guitar combo issues.. no output!
  131. SS amp blues...
  132. Unknown orange PT wire
  133. Deluxe Reverb FAILED at gig!
  134. Peavey Classic30 troubleshooting help please
  135. Crate GFX 120 - Constant hum
  136. Ampeg GT10 Xsistor part number
  137. Help with hum in Vox AC15H1TV
  138. troubleshooting Ampeg B-15-N
  139. Trace Elliot lamp
  140. Hot Rod Deluxe...low volume, weird voltages
  141. Peavey Classic 50 2/12 question
  142. Bogner Alchemist
  143. Trace Elliot GP12
  144. Model T Reissue (Fender) w/ hole burnt in PCB... PT ok?
  145. Bassman 100
  146. SE 5F1-type bias ?
  147. Marshall JMP1 Preamp Clean Channel problem
  148. Fender Deluxe 900 static
  149. Vox AC4TV Buzz Problem
  150. 5F6-A Choke Problem/Questions?
  151. Faulty Laney VH100R
  152. Identify Vox capacitors?
  153. Power transformer gurgling
  154. crate TX50a limo
  155. Radio station coming in through Amp
  156. PCB Trace Repairs
  157. tech question on crate bx-100
  158. Vypyr, almost no low end... mods?
  159. marshall mg100 hdfx mute circuit ??
  160. farty bass problem, Bassman 10
  161. Mackie SWA1501
  162. Problem Behringher PMP 1280s
  163. Sunn Col 300 one thing after another...
  164. Fender red-knob "85" Cracks up.
  165. peavey triumph 60 lost gain channels
  166. Behringer MX 3282A mixer, no output
  167. Super Reverb Bias?
  168. Bad Buzz
  169. Marshall JCM 2000 DSL bias help
  170. Peavey Transtube EFX 212 Lost Balls, static distortion
  171. Ampeg SVT Classic - How Much Background hum is "normal"?
  172. Mesa Heartbreaker Head
  173. no sound from an AB763 clone
  174. Ampeg SVT4 Pro repair
  175. Bias adjustment SFSR
  176. Repairing an old Crate VC-3112W
  177. Can you guys help me understand what happened here?
  178. replacement power transformer for Spectra 212-T?
  179. Shielding question
  180. Neve pickup/preamp system dead
  181. vibro champ tone controls problem
  182. Marshall MG100HDFX Question
  183. DRRI & intermittent problems
  184. selmer trebble and bass 50r sv crackling sound and treble channel down
  185. Killed my Fluke 87 III
  186. Bias for AMPEG SVT 3 pro
  187. Broken volume pot on Valvestate 8080
  188. RCA 40409 & 40410 Transistors
  189. Acoustic 370 blows internal fuse when turned on
  190. EV 1.0kW
  191. Cliff jack nut thread/diameter?
  192. Hartke Model 2000 Repair
  193. boogie mk iv graphic
  194. Fender Twin PT Wires
  195. 68 bandmaster bass pot does nothing bass has disapeared
  196. Ampeg M15 hum
  197. Need supplier for Vox AD50VT PT
  198. Crate G40C will not switch channels!
  199. Mesa 2:90 Voltage Chart
  200. Anyone repair reverb tanks ?
  201. Steelphon GA810 Unknown fuse value
  202. Crate Vintage Club 50 Fixed/Cathode Bias Mod help
  203. How to bias a Silvertone 1482
  204. Reverb hum Valvestate VR65
  205. B-52 AT112 Repair Help
  206. Fender Hot Rod DeVille 212 screeching problem.
  207. high-pitch squeal
  208. Hum Help
  209. Marshall re-issue
  210. Gallien Kreuger 200mv
  211. New (old) amp dilemma....??
  212. Trying to fix loss of volume in a 1978 Randall RG300 Head (SS)
  213. Fender Silverface baffle trim material available for sale?
  214. Bass amps and fuzz pedals... OUCH
  215. Lonestar Special blows fuses
  216. Hum on blackface deluxe that goes when normal channel Vol 2/3 up???
  217. Fender FM212R Squeals at 4ohms, but not 8?
  218. crate limo TX-50D not working
  219. Bad Cat problem/questions
  220. Clean channel clipping low notes
  221. I've really done it this time
  222. Mesa Rocket 44 bias circuit mod?
  223. Blowing rectifier tubes
  224. Marshall EL34 100/100 Poweramp schematic
  225. debugging old peavey blues classic
  226. Heater pulsing normal?
  227. Fender Pro Jr Schematic Question
  228. questions about floating paraphase inverters
  229. Troubleshooting Selmer T'n'B Mk III
  230. Hot Rod Deville Bias Runaway
  231. Testing Mosfets in circuit
  232. Bad Buzzing in SF Bandmaster Reverb
  233. HUM preamp heater short?
  234. Fender '94 Twin Amp Noise...
  235. Nomination: Worst fuse holders ever
  236. Acoustic Control Corporation TO-220 transistor identification
  237. GK 600B resisto-roast
  238. Blue Glow Question
  239. Gibson EH-150
  240. AC30CC repair help/advice
  241. jcm 2000 dsl blowing tubes!
  242. Amp ticking
  243. Need specs. for Line 6 Amp
  244. Mesa Boogie Mark IV tube problem?
  245. Hiwatt custom 20 tube 60 hz hum ideas?
  246. Fender Performer 650
  247. ESR Meter / Tester
  248. hot air desoldering reflow station
  249. Peavey Triumph cuts out until it warms up.
  250. Peavey Classic 20 - Oops