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View Full Version : Maintenance, Troubleshooting & Repair



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  1. fizz and oscillation in Peavey Rockmaster head
  2. Classic 50 tube biasing?
  3. i have damaged my Crate VFX,please help..
  4. 6G12-A Concert clone behaving oddly
  5. Roland Cube 60 -- missing reverb
  6. Peavey Heritage VTX Series
  7. Blues DeVille reissue squealling preamp
  8. Substitute GZ34 for 5U4GB?
  9. Princeton Reverb Re-work
  10. No sound from speaker..?
  11. AC at pin 8 on a 6V6
  12. Pot replacement....I got "shafted"
  13. Keeps blowing the fuse
  14. Blues deluxe..same ole' problem
  15. Color coded capacitor
  16. Miscellaneous Question About Amp Damage
  17. Weber 6a14hp buzz when reverb is on.
  18. line 6 flextoneII hd head problem
  19. Ultimate Chorus
  20. Guitar Research T64RS TUBE
  21. Roland Bolt 60 reverb tank?
  22. Fuse Pops - Transformer Dead
  23. Orange rockerverb owners?
  24. Lafayette (or Univox??) U-80A mystery amp
  25. identify a transformer
  26. Bassman 100 - Should it be louder?
  27. Super Champ XD
  28. Amp Tech Needed in So Cal...
  29. Fender Princeton Chorus problems
  30. Marshall MG100dfx
  31. Marshall Super lead 1959 Problem
  32. JTM45 Build Buzz Problem
  33. Svt 4 pro tubes??
  34. Question about Marshall Valvestate 8100
  35. Marshall JMP 50 watt bias
  36. Traynor yvm-1 voice master acting funny - - -
  37. Fender Concert II problem ( preamp)
  38. Sticker on power tubes? Harmful?
  39. Need pot volume control for op pro preamp Ovation Guitar
  40. Marshall AVT150 Blown Fuses
  41. Diodes for a Twin
  42. Hiwatt Classic 50 Crackling when cranked
  43. NOS 6L6 vs Currently made 6L6
  44. More failed Jamicon 12,000u 80v
  45. Fender Super Reverb AA763 Bias
  46. marshall 8080 pot problems
  47. Need help with Fender Twin Reverb
  48. Vibrolux low volume
  49. Slightly off topic, but strange
  50. High voltage on pin 1 of V5 in '67 Super Reverb
  51. Powering vtl5c1 from heaters on SLO 100 ?
  52. Fender Twin loud reverb hiss
  53. Awful noise from Fender Bantam Bass
  54. power noise parkg10r amplifier
  55. HomeBrew Troublshooting Help
  56. Silvertone 1484 help needed
  57. PEAVEY BRAVO 112 crunch channel bad switch?
  58. 78 Crate CR-1R, 72 Gibson G20, 2006 Randall RG 100 G3 100 watt valve dynamic
  59. Ampeg svt cl hum issues
  60. Polytone Mini Brute lll, lV, M-PA
  61. Need help trouble shooting peavey xl-500 mix amp
  62. Serious ?grounding? problem - kind of scary...
  63. Silvertone 1484 diode substitutes
  64. Trouble with Peavey Backstage 110 amp
  65. '67 Ampeg Jet, no trem & high voltage
  66. Buzz/click!-dead when switching off standby
  67. New Matamp schems
  68. Where to get replacement parts for a Fender Twin Reverb?
  69. Phase linear 700b help!
  70. Complete newbie to amp repair
  71. Peavey TNT Fuse blowing
  72. Park G10 amp at 4Ohm Speaker?
  73. Need schematic for a Crate VC6112
  74. Crate Blue Voodoo 120H acting up:
  75. Mesa DC-5, Massive Hum on Clean Channel
  76. My gibson amp
  77. Peavey Classic vtx series- Troubleshooting repair help needed!!!
  78. fender studio lead amp problem
  79. Dear god not the Selmer again... & PPIMV...
  80. Peavey VT Classic 212 Broken Phase Help
  81. Yamaha G50-112 owners manual wanted
  82. marshall atv100 have no distortion?
  83. Palomino V8 loud hum.
  84. 5e3 volume interaction
  85. SWR workingmans 15 Frying resistors
  86. 59 Bassman reissue cuts out after 10 minutes
  87. Crate Vintage 30
  88. peavey 5150 212 won't power on
  89. SVT 350 XLR out HUM
  90. 65 Twin Reverb Vibrato Problem. Please Help
  91. Ampeg SVT-6PRO death & resurrection
  92. Sunn Sceptre
  93. Blue Voodoo clean channel hiss without volume
  94. Peavey Ultra switching pops
  95. peavey400bh
  96. Princeton speaker rattling in the breeze
  97. solder type ????
  98. Randall RG200
  99. Fender Pro Tube Pro Reverb - Dead Tremolo and Noisy Reverb
  100. Fender Bassman
  101. Ampeg VL502 problem
  102. Power xfrmer wire color? Help!
  103. Could someone explain how this amp was working?
  104. fender stage 100 dsp 112 combo
  105. Peavey KB60 acting up
  106. overheating resistors
  107. please tell me its not a crate
  108. 5150iii channel two compressing
  109. Randall RG50TC problem
  110. how dangerous are floating ground amps (old Supro)
  111. volume loss Crate V32
  112. volume loss Crate V32
  113. Fender Stage 100 DSP
  114. Squire Champ 15/Fender Frontman 15(R)
  115. svt 4 pro going mute
  116. VHT Pitbull 50/12 Issues... Help!
  117. Peavey Studio 210
  118. B-52 AT100 very low volume/fuse blows when standby turned off
  119. Behringer GMX212 amplifier problem
  120. anyone have pic of cts alnico 10' speaker?
  121. Peavey Transtube Supreme Schematic
  122. Help me understand
  123. Channel 2 Fading Out
  124. 61 Reverberocket Reverb Problem
  125. More on Marshall TSL100
  126. Switched Tube Consequences?
  127. Can pulling tubes out one at a time help you locate hum?
  128. Burning 6L6 screen resistors
  129. Please help Marshall jmc 800 (2205) loud hum running out of things 2 look 4.
  130. Ampeg B4R Issue
  131. Replacement power transistors for old JC-120?
  132. Bridge Bad, Would You Replace Regulators?
  133. Diode question
  134. 59' reissue troubles, cracks and hisses
  135. Working Man's 12 blows fuse
  136. barcusberry 1601
  137. Mesa Express - Switching the transformer
  138. Wrong Transformer in Vibro Champ?
  139. Musicman 130 (2275-130) problems
  140. Locating loud hum/noise
  141. Damper diodes as rectifiers
  142. Fender Twin blowing fuses
  143. Fender Twin amp nasty buzz
  144. 16mm 10K Pot for line 6 source
  145. Marshall DSL 100 reissue - hum
  146. Isolation Transformer help
  147. 4x6L6 heater troubles
  148. G80rcd marshall
  149. 5F1 Distortion Like Blown Speaker
  150. Fender Hotrod Deluxe noice
  151. Acoustic 125 guitar combo issues.. no output!
  152. SS amp blues...
  153. Unknown orange PT wire
  154. Deluxe Reverb FAILED at gig!
  155. Peavey Classic30 troubleshooting help please
  156. Crate GFX 120 - Constant hum
  157. Ampeg GT10 Xsistor part number
  158. Help with hum in Vox AC15H1TV
  159. troubleshooting Ampeg B-15-N
  160. Trace Elliot lamp
  161. Hot Rod Deluxe...low volume, weird voltages
  162. Peavey Classic 50 2/12 question
  163. Bogner Alchemist
  164. Trace Elliot GP12
  165. Model T Reissue (Fender) w/ hole burnt in PCB... PT ok?
  166. Bassman 100
  167. SE 5F1-type bias ?
  168. Marshall JMP1 Preamp Clean Channel problem
  169. Fender Deluxe 900 static
  170. Vox AC4TV Buzz Problem
  171. 5F6-A Choke Problem/Questions?
  172. Faulty Laney VH100R
  173. Identify Vox capacitors?
  174. Power transformer gurgling
  175. crate TX50a limo
  176. Radio station coming in through Amp
  177. PCB Trace Repairs
  178. tech question on crate bx-100
  179. Vypyr, almost no low end... mods?
  180. marshall mg100 hdfx mute circuit ??
  181. farty bass problem, Bassman 10
  182. Mackie SWA1501
  183. Problem Behringher PMP 1280s
  184. Sunn Col 300 one thing after another...
  185. Fender red-knob "85" Cracks up.
  186. peavey triumph 60 lost gain channels
  187. Behringer MX 3282A mixer, no output
  188. Super Reverb Bias?
  189. Bad Buzz
  190. Marshall JCM 2000 DSL bias help
  191. Peavey Transtube EFX 212 Lost Balls, static distortion
  192. Ampeg SVT Classic - How Much Background hum is "normal"?
  193. Mesa Heartbreaker Head
  194. no sound from an AB763 clone
  195. Ampeg SVT4 Pro repair
  196. Bias adjustment SFSR
  197. Repairing an old Crate VC-3112W
  198. Can you guys help me understand what happened here?
  199. replacement power transformer for Spectra 212-T?
  200. Shielding question
  201. Neve pickup/preamp system dead
  202. vibro champ tone controls problem
  203. Marshall MG100HDFX Question
  204. DRRI & intermittent problems
  205. selmer trebble and bass 50r sv crackling sound and treble channel down
  206. Killed my Fluke 87 III
  207. Bias for AMPEG SVT 3 pro
  208. Broken volume pot on Valvestate 8080
  209. RCA 40409 & 40410 Transistors
  210. Acoustic 370 blows internal fuse when turned on
  211. EV 1.0kW
  212. Cliff jack nut thread/diameter?
  213. Hartke Model 2000 Repair
  214. boogie mk iv graphic
  215. Fender Twin PT Wires
  216. 68 bandmaster bass pot does nothing bass has disapeared
  217. Ampeg M15 hum
  218. Need supplier for Vox AD50VT PT
  219. Crate G40C will not switch channels!
  220. Mesa 2:90 Voltage Chart
  221. Anyone repair reverb tanks ?
  222. Steelphon GA810 Unknown fuse value
  223. Crate Vintage Club 50 Fixed/Cathode Bias Mod help
  224. How to bias a Silvertone 1482
  225. Reverb hum Valvestate VR65
  226. B-52 AT112 Repair Help
  227. Fender Hot Rod DeVille 212 screeching problem.
  228. high-pitch squeal
  229. Hum Help
  230. Marshall re-issue
  231. Gallien Kreuger 200mv
  232. New (old) amp dilemma....??
  233. Trying to fix loss of volume in a 1978 Randall RG300 Head (SS)
  234. Fender Silverface baffle trim material available for sale?
  235. Bass amps and fuzz pedals... OUCH
  236. Lonestar Special blows fuses
  237. Hum on blackface deluxe that goes when normal channel Vol 2/3 up???
  238. Fender FM212R Squeals at 4ohms, but not 8?
  239. crate limo TX-50D not working
  240. Bad Cat problem/questions
  241. Clean channel clipping low notes
  242. I've really done it this time
  243. Mesa Rocket 44 bias circuit mod?
  244. Blowing rectifier tubes
  245. Marshall EL34 100/100 Poweramp schematic
  246. debugging old peavey blues classic
  247. Heater pulsing normal?
  248. Fender Pro Jr Schematic Question
  249. questions about floating paraphase inverters
  250. Troubleshooting Selmer T'n'B Mk III