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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Peavey Studio 210
  2. B-52 AT100 very low volume/fuse blows when standby turned off
  3. Behringer GMX212 amplifier problem
  4. anyone have pic of cts alnico 10' speaker?
  5. Peavey Transtube Supreme Schematic
  6. Help me understand
  7. Channel 2 Fading Out
  8. 61 Reverberocket Reverb Problem
  9. More on Marshall TSL100
  10. Switched Tube Consequences?
  11. Can pulling tubes out one at a time help you locate hum?
  12. Burning 6L6 screen resistors
  13. Please help Marshall jmc 800 (2205) loud hum running out of things 2 look 4.
  14. Ampeg B4R Issue
  15. Replacement power transistors for old JC-120?
  16. Bridge Bad, Would You Replace Regulators?
  17. Diode question
  18. 59' reissue troubles, cracks and hisses
  19. Working Man's 12 blows fuse
  20. barcusberry 1601
  21. Mesa Express - Switching the transformer
  22. Wrong Transformer in Vibro Champ?
  23. Musicman 130 (2275-130) problems
  24. Locating loud hum/noise
  25. Damper diodes as rectifiers
  26. Fender Twin blowing fuses
  27. Fender Twin amp nasty buzz
  28. 16mm 10K Pot for line 6 source
  29. Marshall DSL 100 reissue - hum
  30. Isolation Transformer help
  31. 4x6L6 heater troubles
  32. G80rcd marshall
  33. 5F1 Distortion Like Blown Speaker
  34. Fender Hotrod Deluxe noice
  35. Acoustic 125 guitar combo issues.. no output!
  36. SS amp blues...
  37. Unknown orange PT wire
  38. Deluxe Reverb FAILED at gig!
  39. Peavey Classic30 troubleshooting help please
  40. Crate GFX 120 - Constant hum
  41. Ampeg GT10 Xsistor part number
  42. Help with hum in Vox AC15H1TV
  43. troubleshooting Ampeg B-15-N
  44. Trace Elliot lamp
  45. Hot Rod Deluxe...low volume, weird voltages
  46. Peavey Classic 50 2/12 question
  47. Bogner Alchemist
  48. Trace Elliot GP12
  49. Model T Reissue (Fender) w/ hole burnt in PCB... PT ok?
  50. Bassman 100
  51. SE 5F1-type bias ?
  52. Marshall JMP1 Preamp Clean Channel problem
  53. Fender Deluxe 900 static
  54. Vox AC4TV Buzz Problem
  55. 5F6-A Choke Problem/Questions?
  56. Faulty Laney VH100R
  57. Identify Vox capacitors?
  58. Power transformer gurgling
  59. crate TX50a limo
  60. Radio station coming in through Amp
  61. PCB Trace Repairs
  62. tech question on crate bx-100
  63. Vypyr, almost no low end... mods?
  64. marshall mg100 hdfx mute circuit ??
  65. farty bass problem, Bassman 10
  66. Mackie SWA1501
  67. Problem Behringher PMP 1280s
  68. Sunn Col 300 one thing after another...
  69. Fender red-knob "85" Cracks up.
  70. peavey triumph 60 lost gain channels
  71. Behringer MX 3282A mixer, no output
  72. Super Reverb Bias?
  73. Bad Buzz
  74. Marshall JCM 2000 DSL bias help
  75. Peavey Transtube EFX 212 Lost Balls, static distortion
  76. Ampeg SVT Classic - How Much Background hum is "normal"?
  77. Mesa Heartbreaker Head
  78. no sound from an AB763 clone
  79. Ampeg SVT4 Pro repair
  80. Bias adjustment SFSR
  81. Repairing an old Crate VC-3112W
  82. Can you guys help me understand what happened here?
  83. replacement power transformer for Spectra 212-T?
  84. Shielding question
  85. Neve pickup/preamp system dead
  86. vibro champ tone controls problem
  87. Marshall MG100HDFX Question
  88. DRRI & intermittent problems
  89. selmer trebble and bass 50r sv crackling sound and treble channel down
  90. Killed my Fluke 87 III
  91. Bias for AMPEG SVT 3 pro
  92. Broken volume pot on Valvestate 8080
  93. RCA 40409 & 40410 Transistors
  94. Acoustic 370 blows internal fuse when turned on
  95. EV 1.0kW
  96. Cliff jack nut thread/diameter?
  97. Hartke Model 2000 Repair
  98. boogie mk iv graphic
  99. Fender Twin PT Wires
  100. 68 bandmaster bass pot does nothing bass has disapeared
  101. Ampeg M15 hum
  102. Need supplier for Vox AD50VT PT
  103. Crate G40C will not switch channels!
  104. Mesa 2:90 Voltage Chart
  105. Anyone repair reverb tanks ?
  106. Steelphon GA810 Unknown fuse value
  107. Crate Vintage Club 50 Fixed/Cathode Bias Mod help
  108. How to bias a Silvertone 1482
  109. Reverb hum Valvestate VR65
  110. B-52 AT112 Repair Help
  111. Fender Hot Rod DeVille 212 screeching problem.
  112. high-pitch squeal
  113. Hum Help
  114. Marshall re-issue
  115. Gallien Kreuger 200mv
  116. New (old) amp dilemma....??
  117. Trying to fix loss of volume in a 1978 Randall RG300 Head (SS)
  118. Fender Silverface baffle trim material available for sale?
  119. Bass amps and fuzz pedals... OUCH
  120. Lonestar Special blows fuses
  121. Hum on blackface deluxe that goes when normal channel Vol 2/3 up???
  122. Fender FM212R Squeals at 4ohms, but not 8?
  123. crate limo TX-50D not working
  124. Bad Cat problem/questions
  125. Clean channel clipping low notes
  126. I've really done it this time
  127. Mesa Rocket 44 bias circuit mod?
  128. Blowing rectifier tubes
  129. Marshall EL34 100/100 Poweramp schematic
  130. debugging old peavey blues classic
  131. Heater pulsing normal?
  132. Fender Pro Jr Schematic Question
  133. questions about floating paraphase inverters
  134. Troubleshooting Selmer T'n'B Mk III
  135. Hot Rod Deville Bias Runaway
  136. Testing Mosfets in circuit
  137. Bad Buzzing in SF Bandmaster Reverb
  138. HUM preamp heater short?
  139. Fender '94 Twin Amp Noise...
  140. Nomination: Worst fuse holders ever
  141. Acoustic Control Corporation TO-220 transistor identification
  142. GK 600B resisto-roast
  143. Blue Glow Question
  144. Gibson EH-150
  145. AC30CC repair help/advice
  146. jcm 2000 dsl blowing tubes!
  147. Amp ticking
  148. Need specs. for Line 6 Amp
  149. Mesa Boogie Mark IV tube problem?
  150. Hiwatt custom 20 tube 60 hz hum ideas?
  151. Fender Performer 650
  152. ESR Meter / Tester
  153. hot air desoldering reflow station
  154. Peavey Triumph cuts out until it warms up.
  155. Peavey Classic 20 - Oops
  156. Ampeg SVT4 Pro failure
  157. Good Work Surface
  158. Another Problem with another Peavey Classic VTX 212 65 Watts
  159. I need schematics for crate stealth 50
  160. Marshall MG100HDFX low on volume.
  161. Fener BXR300C hum
  162. How do I internally join inputs in a plexi-style circuit ?
  163. noise noise noise
  164. Marshall AVT150H Blowing Fuses
  165. Berhinger PMP 5000
  166. Help with channel switching on the dreaded JCM2000DSL 100
  167. Tubes Help
  168. Peavey Combo 300 no output
  169. Ampeg v2 red plate help!
  170. Crate VC50 hot tranny/slight hum...
  171. Carlsbro 60 watt twin channel
  172. Stagepas 300
  173. Marshall JCM 2000 Super Lead - won't turn on
  174. Fender HR DeVille probs...
  175. Best High Current Connector
  176. Marshall Specialist tremolo not working
  177. Some info. On Line 6 AX2?
  178. Super Reverb Attempt to Clone with ugly distortion
  179. Sunn 300T signal gain
  180. Crate VC-3112 stuck on B channel. Help please.
  181. Crosstalk channel bleed trouble shooting
  182. Marshall AVT150H Repair help needed.
  183. "The Twin" Fender Amp bias adjust
  184. Crate V-100h Head Died
  185. Bugera Problem
  186. Dean Markly CD-30 Tube Amp has me baffled...
  187. Roland JC 120 effects loop
  188. Fender Performer 1000 problems
  189. Behringer PMH2000 schematic
  190. princeton: polarity switch modded for standby?
  191. fender amp problem
  192. another Hartke Overheating Post
  193. Laney AOR 100w first series, 505 volts on the plates ?
  194. jtm30 bias mod problem
  195. Marshall VS100 combo - occassional overpowering buzz
  196. Fender Transformer Problem
  197. Music man 2275-65 ss phase inverter issue?
  198. Ampeg SVT II Pro - help needed
  199. Ampex ATR-700 trim pot
  200. marshall 8080 low level hum
  201. Reverb tank for Kustom 50
  202. Marshall JCM 900 4100 Fading
  203. I can't fix anything for finding more stuff
  204. 5150 Power board problem
  205. hartke LH1000
  206. Massive hum - B-15N
  207. Super Reverb cooks Reverb Driver 12AT7
  208. Laney amp problem
  209. Sunn 300T replacement pot?
  210. Acoustic 470 Guitar/Bass amp
  211. Dead PT
  212. Why does the Pro Jr sound so much thinner than a Princeton Reverb ?
  213. Twin Reverb 15 Popping/crackling on startup
  214. Peavey XXL cutting in/out
  215. SWR LA15 complete schematics
  216. tantalum replacement in Kustom 200
  217. Marshall MG50DFX No sound from main input
  218. On tour in Europe, need help with Sunn 300T
  219. Tube Amp Hum, No Sound
  220. Carvin R1000 Bass Amp Poroblem
  221. Help! Can't rock until this is resolved!!
  222. trying to chase and kill hum in tube echo and reverb
  223. Fender Bullet problems
  224. Rivera Knucklehead switching problems
  225. Mesa Bass 400 preamp voltages WAY too high!?
  226. Peavey session 400 (210 Watts) Capacitor Problem!
  227. Peavey Bandit loud popping
  228. Noise problems with new Vox AC100CPH Classic Plus
  229. Large Radial Caps
  230. How to measure bias in a Fender Pro Junior (1ohm resistor)
  231. another noisy Silvertone 1484
  232. Ampeg SVT-VR&CL popping intermittently
  233. Reverb Tank Suitable Replacement - Acc. Type 1 Tank
  234. Super Beatle Caps Question
  235. volume problems with a first amp build
  236. Ampeg SVT-VR&CL ground loop hum solution
  237. 5E3 kit - preamp hum
  238. Intermittent, volume independent crackle on Fender Deluxe Reverb (w/ mp3)
  239. Ampeg V7 reeverb problem
  240. 5150 Screen Grid RESISTOR/Tube question...
  241. SF Bassman 100 hum problem
  242. GK 400RB mark IV
  243. Fender Prosonic SERVICE Manual / Components List sought
  244. Using a variac
  245. EH EL34 heater-cathode leakage
  246. Randal RG200 G3
  247. Rickenbacker TR35B amplifier
  248. Rhodes Suitcase Dual 50W amp
  249. Help, Road King Clean Channel volume drop after oscilloscope method tube check
  250. Peavey Mace Question