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View Full Version : Maintenance, Troubleshooting & Repair



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  1. peavey triumph 60 lost gain channels
  2. Behringer MX 3282A mixer, no output
  3. Super Reverb Bias?
  4. Bad Buzz
  5. Marshall JCM 2000 DSL bias help
  6. Peavey Transtube EFX 212 Lost Balls, static distortion
  7. Ampeg SVT Classic - How Much Background hum is "normal"?
  8. Mesa Heartbreaker Head
  9. no sound from an AB763 clone
  10. Ampeg SVT4 Pro repair
  11. Bias adjustment SFSR
  12. Repairing an old Crate VC-3112W
  13. Can you guys help me understand what happened here?
  14. replacement power transformer for Spectra 212-T?
  15. Shielding question
  16. Neve pickup/preamp system dead
  17. vibro champ tone controls problem
  18. Marshall MG100HDFX Question
  19. DRRI & intermittent problems
  20. selmer trebble and bass 50r sv crackling sound and treble channel down
  21. Killed my Fluke 87 III
  22. Bias for AMPEG SVT 3 pro
  23. Broken volume pot on Valvestate 8080
  24. RCA 40409 & 40410 Transistors
  25. Acoustic 370 blows internal fuse when turned on
  26. EV 1.0kW
  27. Cliff jack nut thread/diameter?
  28. Hartke Model 2000 Repair
  29. boogie mk iv graphic
  30. Fender Twin PT Wires
  31. 68 bandmaster bass pot does nothing bass has disapeared
  32. Ampeg M15 hum
  33. Need supplier for Vox AD50VT PT
  34. Crate G40C will not switch channels!
  35. Mesa 2:90 Voltage Chart
  36. Anyone repair reverb tanks ?
  37. Steelphon GA810 Unknown fuse value
  38. Crate Vintage Club 50 Fixed/Cathode Bias Mod help
  39. How to bias a Silvertone 1482
  40. Reverb hum Valvestate VR65
  41. B-52 AT112 Repair Help
  42. Fender Hot Rod DeVille 212 screeching problem.
  43. high-pitch squeal
  44. Hum Help
  45. Marshall re-issue
  46. Gallien Kreuger 200mv
  47. New (old) amp dilemma....??
  48. Trying to fix loss of volume in a 1978 Randall RG300 Head (SS)
  49. Fender Silverface baffle trim material available for sale?
  50. Bass amps and fuzz pedals... OUCH
  51. Lonestar Special blows fuses
  52. Hum on blackface deluxe that goes when normal channel Vol 2/3 up???
  53. Fender FM212R Squeals at 4ohms, but not 8?
  54. crate limo TX-50D not working
  55. Bad Cat problem/questions
  56. Clean channel clipping low notes
  57. I've really done it this time
  58. Mesa Rocket 44 bias circuit mod?
  59. Blowing rectifier tubes
  60. Marshall EL34 100/100 Poweramp schematic
  61. debugging old peavey blues classic
  62. Heater pulsing normal?
  63. Fender Pro Jr Schematic Question
  64. questions about floating paraphase inverters
  65. Troubleshooting Selmer T'n'B Mk III
  66. Hot Rod Deville Bias Runaway
  67. Testing Mosfets in circuit
  68. Bad Buzzing in SF Bandmaster Reverb
  69. HUM preamp heater short?
  70. Fender '94 Twin Amp Noise...
  71. Nomination: Worst fuse holders ever
  72. Acoustic Control Corporation TO-220 transistor identification
  73. GK 600B resisto-roast
  74. Blue Glow Question
  75. Gibson EH-150
  76. AC30CC repair help/advice
  77. jcm 2000 dsl blowing tubes!
  78. Amp ticking
  79. Need specs. for Line 6 Amp
  80. Mesa Boogie Mark IV tube problem?
  81. Hiwatt custom 20 tube 60 hz hum ideas?
  82. Fender Performer 650
  83. ESR Meter / Tester
  84. hot air desoldering reflow station
  85. Peavey Triumph cuts out until it warms up.
  86. Peavey Classic 20 - Oops
  87. Ampeg SVT4 Pro failure
  88. Good Work Surface
  89. Another Problem with another Peavey Classic VTX 212 65 Watts
  90. I need schematics for crate stealth 50
  91. Marshall MG100HDFX low on volume.
  92. Fener BXR300C hum
  93. How do I internally join inputs in a plexi-style circuit ?
  94. noise noise noise
  95. Marshall AVT150H Blowing Fuses
  96. Berhinger PMP 5000
  97. Help with channel switching on the dreaded JCM2000DSL 100
  98. Tubes Help
  99. Peavey Combo 300 no output
  100. Ampeg v2 red plate help!
  101. Crate VC50 hot tranny/slight hum...
  102. Carlsbro 60 watt twin channel
  103. Stagepas 300
  104. Marshall JCM 2000 Super Lead - won't turn on
  105. Fender HR DeVille probs...
  106. Best High Current Connector
  107. Marshall Specialist tremolo not working
  108. Some info. On Line 6 AX2?
  109. Super Reverb Attempt to Clone with ugly distortion
  110. Sunn 300T signal gain
  111. Crate VC-3112 stuck on B channel. Help please.
  112. Crosstalk channel bleed trouble shooting
  113. Marshall AVT150H Repair help needed.
  114. "The Twin" Fender Amp bias adjust
  115. Crate V-100h Head Died
  116. Bugera Problem
  117. Dean Markly CD-30 Tube Amp has me baffled...
  118. Roland JC 120 effects loop
  119. Fender Performer 1000 problems
  120. Behringer PMH2000 schematic
  121. princeton: polarity switch modded for standby?
  122. fender amp problem
  123. another Hartke Overheating Post
  124. Laney AOR 100w first series, 505 volts on the plates ?
  125. jtm30 bias mod problem
  126. Marshall VS100 combo - occassional overpowering buzz
  127. Fender Transformer Problem
  128. Music man 2275-65 ss phase inverter issue?
  129. Ampeg SVT II Pro - help needed
  130. Ampex ATR-700 trim pot
  131. marshall 8080 low level hum
  132. Reverb tank for Kustom 50
  133. Marshall JCM 900 4100 Fading
  134. I can't fix anything for finding more stuff
  135. 5150 Power board problem
  136. hartke LH1000
  137. Massive hum - B-15N
  138. Super Reverb cooks Reverb Driver 12AT7
  139. Laney amp problem
  140. Sunn 300T replacement pot?
  141. Acoustic 470 Guitar/Bass amp
  142. Dead PT
  143. Why does the Pro Jr sound so much thinner than a Princeton Reverb ?
  144. Twin Reverb 15 Popping/crackling on startup
  145. Peavey XXL cutting in/out
  146. SWR LA15 complete schematics
  147. tantalum replacement in Kustom 200
  148. Marshall MG50DFX No sound from main input
  149. On tour in Europe, need help with Sunn 300T
  150. Tube Amp Hum, No Sound
  151. Carvin R1000 Bass Amp Poroblem
  152. Help! Can't rock until this is resolved!!
  153. trying to chase and kill hum in tube echo and reverb
  154. Fender Bullet problems
  155. Rivera Knucklehead switching problems
  156. Mesa Bass 400 preamp voltages WAY too high!?
  157. Peavey session 400 (210 Watts) Capacitor Problem!
  158. Peavey Bandit loud popping
  159. Noise problems with new Vox AC100CPH Classic Plus
  160. Large Radial Caps
  161. How to measure bias in a Fender Pro Junior (1ohm resistor)
  162. another noisy Silvertone 1484
  163. Ampeg SVT-VR&CL popping intermittently
  164. Reverb Tank Suitable Replacement - Acc. Type 1 Tank
  165. Super Beatle Caps Question
  166. volume problems with a first amp build
  167. Ampeg SVT-VR&CL ground loop hum solution
  168. 5E3 kit - preamp hum
  169. Intermittent, volume independent crackle on Fender Deluxe Reverb (w/ mp3)
  170. Ampeg V7 reeverb problem
  171. 5150 Screen Grid RESISTOR/Tube question...
  172. SF Bassman 100 hum problem
  173. GK 400RB mark IV
  174. Fender Prosonic SERVICE Manual / Components List sought
  175. Using a variac
  176. EH EL34 heater-cathode leakage
  177. Randal RG200 G3
  178. Rickenbacker TR35B amplifier
  179. Rhodes Suitcase Dual 50W amp
  180. Help, Road King Clean Channel volume drop after oscilloscope method tube check
  181. Peavey Mace Question
  182. Static - Bad OT?
  183. HiWatt DR103 problem
  184. Problems with a new Fender BandMaster V Series! Uggh!
  185. Harsh sounding high notes (first tube preamp)
  186. Randall RG200 G3 Low power
  187. Screen resistor voltage drop
  188. Marshal Valvestate Model 8100 Trouble
  189. crate-gx212 problem need help
  190. Ampeg b-100 problem
  191. Peavey 600F mixer amp problem
  192. Peavey mace
  193. Hot Rod Deville.. please help!
  194. Parts Salvage Question
  195. Bassman AB165 midrange hiss
  196. Shorted Reverb Tank Causes Distortion
  197. regulated AC PSU
  198. Hotrod Deluxe Problem
  199. Wurlitzer 200 Power transistors.
  200. Sunn Model A
  201. Dr. Z kt-45 question
  202. Peavey C30: noise forever ?
  203. TDA7293 replacement in an AVT150
  204. Anyone got a schematic for a Crate TV-6212?
  205. Help and ideas for repairs to Ampeg B2r
  206. Refurbishing a Peavey KB60
  207. Optical pedal repair
  208. RI 65 Twin Reverb with excessive feedback
  209. Strange coupling capacitor problem
  210. peavey tko 115 bass amp circuit
  211. Soldering question
  212. QSC mx2000a
  213. Music Man HD 212
  214. Ashdown MAG600 volume?
  215. VYPYR 30 -No Input audio...
  216. Fender Deluxe Reverb 65, swapped 6v6 and rectifier tube by mistake
  217. When to start repair.
  218. Peavey Special 130 blowing fuses
  219. crate bfx100 blows fuses - possible dc in output
  220. peavey kb100
  221. Help with questions to ask Amp Tech & request list
  222. Help Me Solve This Power Amp Riddle
  223. Throw out bad speakers?
  224. Bassman 10 (70?) PT question
  225. Peavey Renown , howling
  226. SWR SM 400 left channel distorted
  227. volume drop when negative feedback is doisconnected
  228. AVT-50 hum
  229. Morley PFL xformers
  230. New Pot for Fender Blues Deluxe?
  231. Weird DSL +/- 15v supply problem.
  232. Twin Reverb Problems
  233. Boogie Mark I reissue intermittent
  234. AAARRRRGGGHHH! 5150 Question(s)!
  235. 5E3 low feedback/oscillation, stumped???
  236. crackling sound in tube amp
  237. Garnet Mach 5 from 1969
  238. growing bias
  239. Valves for Ashdown FA 60 DSP Head
  240. Problems with a Peavey Classic VTX 65 watt amp.
  241. impedence rule of thumb?
  242. Electrolytics for signal path restoration?
  243. Unplugged speaker protection & line out
  244. dying Mesa nomad 100
  245. Marshall JTM 60 filter cap problem
  246. Marshall VS100 - high pitched squeel
  247. Marshall SL100 Bass Knob Not working
  248. Vox DA15 problem
  249. '76 Princeton Reverb reverb tone/level mod?
  250. Peavey Audition CHORUS request