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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Crate GX80 Channel switching
  2. Hum / Buzz only when cord attached...
  3. Dropping Voltage at PT
  4. Current surge in a heater circuit.
  5. Boogie - cuts out
  6. Bandmaster AB763, please help this newbie diagnose, i have all voltage measurments...
  7. Ampeg SVT-4 PRO Volume Drop at Gain Peak
  8. Plate voltage rising on PR
  9. Bassman 100 help: screen resistors fried
  10. Clean Amp distortion problem?
  11. Crate GTX120 residual hum issue
  12. Crate GX130C guitar amp cuts in and out
  13. How to discharge filter caps?
  14. AC15 screen resistors
  15. Hotrod Deville squealing?
  16. Marshall VS265 Speaker Issue
  17. Carrotron Noise Fader
  18. 5150 Channel switching
  19. Fender Stage Lead problem
  20. Bandmaster ab763. Thump or "waa" sound when standby is disengaged.
  21. Recap question
  22. Need Transistor Sub For Kustom K200
  23. Newbie looking for help on 5E3 hybrid
  24. HRDlx very very low output after mods
  25. AC15 RI red plating, no audio
  26. Bad Reverb Tank???
  27. Rats in the Peavey
  28. Alamo Amp-5 Help
  29. Princeton Reverb (Blackface) problem
  30. ampeg gemini 2 weak reverb
  31. Time for my first recap - Advice sought
  32. Marshall JMP Standby Problem
  33. marshall tsl bias and hum problem
  34. Marshall DSL 401 Bridge Rectifier
  35. no crunsh sound but lot of noise with Mesa Boogie Mark 3
  36. Cant seem to figure this one out......Soldano designed Yamaha T50C
  37. Super Reverb
  38. BNC or Banana Jacks to 1/4 jack
  39. Trouble shooting Silvertone twin twelve, squeal
  40. Hartke 3500 problem
  41. 50's Rickenbacker M8 amp died today. Help!
  42. Advice needed- best way to lower plate voltage
  43. Trouble with Fender frontman 15g
  44. Problem with a plexi
  45. loud hum w/ my Mesa
  46. Crate V18 does anyone have schematic for the smps pcb?
  47. Ampeg BA115 Trouble Shooting
  48. Fried my Ampeg AX-70!?
  49. Peavey Classic VT tube problem
  50. KT88 Champ
  51. Sunn Model T cap job
  52. el-84 red plating
  53. Help with Peavy Classic 50 4*10
  54. Peavey Chorus 400
  55. peavy bandit reverb out.
  56. Crate vintage club 30 volume spikes?
  57. Which Bias Probe to get? Compu-Bias or ??
  58. Crate G10-XL info
  59. Power Tube Rattle
  60. Not sending to reverb on Traynor YCV20
  61. Fender Super 210, no clean channel, stays loud
  62. SVT short, OPT suspected.
  63. Line 6 AX2 repair help
  64. Ampeg SVT-5 Pro Misc Questions
  65. Test point input signal
  66. Bugera V22
  67. Help fixing my Mesa Boogie Mark IV
  68. Need help with a 1988ish Polytone
  69. Fender Frontman 65R - hiss when cable plugged in
  70. Bad OT affect bias, cause redplating?
  71. new combo smell is it normal
  72. Orange Rocker 30 volume in&out
  73. Acoustic B200 short problem.
  74. Diagnosis assistant
  75. How to wire this Hiwatt Custom 20 fix?
  76. PT hum in Orange OR 80
  77. 60Hz Hum in Mesa Boogie Triaxis
  78. Epiphone Galaxie 10 Power Transformer
  79. Dummy Loads??!
  80. 1970's Fender Princeton: No Sound
  81. How to not destroy pots when removing knobs???
  82. Ampeg Gemini II can cap values
  83. Delta Blues reverb op amp
  84. Help with Biasing a Bassman 5F6A
  85. Roc Pro 1000 stuck on disortion?
  86. Peavey Dual amp
  87. HiWatt DR201 Bias Problem
  88. Capacitor Failure
  89. Help for a complete new guy
  90. B-52 matrix 200 with no output.
  91. Sound Cuts From Marshall vs65r
  92. A power or volume drop on a Fender Supersonic
  93. Bad pots, Come on?
  94. What did I do wrong?
  95. Cornford Carrera - Crackling/hissing
  96. Mesa Boogie Duel rec. 3 ch. solo head with no power amp output
  97. Getting bias vltage from a non-centertapped secondary
  98. hartke 3500 power-on problem
  99. '84 Marshall 5005 Lead 12 power switch
  100. Tremolo Not Working-1972 Super Reverb
  101. fender stage 100 amp buzzing
  102. Laney becomes intermittent after two hours...
  103. Help with Carvin Legacy please - newbie
  104. Bassman 100 grid leak and bias Q's
  105. Hookup wire
  106. Noisy Princeton Reverb Clone
  107. Hot Rod Deluxe Master Pot
  108. Output wattage opinions?
  109. newbie help with marshall amp please
  110. '74 Pro Reverb with hum and reverb noise
  111. Removing powertubes and running
  112. Need Help with Fender Twin Reverb
  113. Power supply for a preamp
  114. need help with a resistor value
  115. Help with Marshall Please
  116. noise peavey classic 50
  117. Peavey XR 600E repairs
  118. nmv twin reverb vibrato
  119. Fender Twin-Amp Feedback
  120. Laney LC15 problem
  121. level dependant buzz/static
  122. 1964 Gibson GA17RVT "Scout" volume......
  123. Marshall 8004 Woes
  124. Trace Acoustic TA100R Schem.
  125. 1973 Princeton. Low volume.
  126. why is SFDR picking up more buzz than BF Bassman?
  127. Deluxe Reverb Stock Speaker Trouble
  128. Peavey Classic VTX
  129. Carvin BelAir - Low Voltage, Output, lot's of problems
  130. PREMIER AMPS B-160 and B-220
  131. My new Mesa Boogie Mark III Red Stripe
  132. Belgiums bitch
  133. Got a fender blues deville mexican, fixed a few problems but reverb feedsback bad.
  134. Marshall Haze 40C Tube 4 turns sign wave into hard very loud sq. wave to early,ideas?
  135. piezo preamp
  136. Vibro Champ not Vib-ing
  137. Deluxe Reverb Reissue Hum Issue
  138. Kustom 150 power supply 50% high
  139. Vibro Champ from parts... B+ voltage low, 155v
  140. Fender Footswitch trouble
  141. Amp Hiss
  142. AC30 TB/6 Vib/Trem Controls
  143. VOX AD100VT Troubleshoot
  144. plugging 8 ohm speaker into super reverb
  145. PV XXX channel sw problem
  146. Deluxe Reverb Power transformer - 0990761
  147. buzzing amp
  148. Mode Four smokin' but with real smoke!
  149. Ampeg SVT4-Pro Problems
  150. Peavey 130 Hum
  151. Crate Vintage Club 50 Head Is Hissing and Crackling
  152. trouble with ashdown evo2 300 and trace elliott gp7 amp heads
  153. Fender Squier 15 input jack
  154. Peavey Vypyr 15
  155. mesa problems
  156. Behringer ULM2000 microphone
  157. switch for an Ibanez TS9
  158. 5V4 in Champ
  159. Testing an output transformer
  160. CS800 Proper Schematic
  161. Hiwatt 200 problems
  162. Old Pro Reverb
  163. Help with output transformer
  164. Roland cube 100 guitar amp- loss of power
  165. Marshall g100rcd smoke checked?
  166. Is this "Crossover Distortion"?
  167. rattle in GT EL84s, again!
  168. Fender Showman output?
  169. Yamaha T100C
  170. Peavey Stereo Chorus 400 footswitch circuit needed.
  171. Marshall MHZ40C - Buzzing
  172. My Classic 30 DIED!!!
  173. Behringer GMX110 fried power amplifier
  174. Echoplex EP2 Hum
  175. How I "safely" use 2-prong amps until I change to 3-prong!
  176. Low voltages in 1972 Orange Graphic 80
  177. Need help! channel and crunch switch not working!!!
  178. need diagnosis help for dead amp
  179. Bridge rectifier issue...
  180. Mig-50 PI type parasitics after a few hours
  181. Fender Princeton Chorus
  182. Peavey Bass 400 m3 DC on Output
  183. Ampeg B-15T distortion
  184. Unidentified Model
  185. peavey 5150 sounds bad
  186. Vibro Champ Rebuild - Plate voltage high
  187. Bugera 333xl sounds bad suddenly
  188. Crate GTX212 Squeals on power up
  189. Crate PX-600 Whistles when turned off
  190. G1 amp in a Case
  191. Fender Frontman 15G 60hz Hum
  192. Peavey Vypyr 15 problems
  193. Carlsbro top 50 OT installation
  194. Help with Peavey Bravo
  195. Traynor Bassmaster Tubes
  196. Hum in DIY preamp
  197. Yamaha G50 112
  198. Sunn concert bass repaires
  199. NO sound out of 30 watt Peavey Delta Blues!
  200. Ruby EL84
  201. Quiet champ, blown OT?
  202. Need help yesterday
  203. Yamaha fifty 210, G50-210
  204. Diagnose a cheapo amp?
  205. Old Amp Hum
  206. Noisy presence pot
  207. Vintage Ampeg SVT troubles
  208. Trace Elliot SuperTramp Twin losing power
  209. Bassman reissue problem
  210. Gibsonette 6V6GT Biasing
  211. Traynor YGM-replaced filter caps/NF mod and now volume works strange...
  212. Fuzzy signal to speaker on Peavey Nashville 400
  213. Tube holder for Peavey Classic 30? Hmm, I wonder if there is suc a beast??
  214. Fender "The Twin" noise in channel 2
  215. help with Fender PD 150 Deluxe (Passport POS)
  216. Fender Reverb FR 1000
  217. Crate GT-50H Combo Amp
  218. Another Marshall MG50DFX with no sound...?
  219. Power Transformer Heat
  220. Glockenklang Soul
  221. Marshall MG250HDFX No Output
  222. Was given a Marshall MG 50DFX but no volume
  223. Marshall JCM 2000-DSL50 output issue
  224. Marshall Valvestate VS30- Hum/No Output
  225. Marshall 8080 - Lack of volume on boost channel.
  226. Shorted Transistors in a Crate PX-600DP
  227. encore 65 - problems/distortion/reverb
  228. Peavey 5150 has lost it's Gain... Help
  229. JCM 600 bias problem
  230. Amp tune -up?
  231. Mackie SWA 1501 fuse blowing
  232. Phase Inverter Test
  233. Please Help troubleshoot Vibroverb
  234. Yamaha G50-112II DC Board
  235. Hughes and Kettner Trilogy switching
  236. 67-68 Bandmaster
  237. Crossover part please
  238. Crate Vintage Club 50 causing fits
  239. SF Bandmaster L.F. Oscillation
  240. CARLSBRO GRX7 MIXER PA AMP INTERNAL FUSE BLOWS Help Please
  241. Audible oscillation while plugged into dummy load
  242. buying tube ?
  243. help with fender deluxe 90 dsp
  244. Fender Hotrod Deville prob.
  245. hum problem in swr basic black
  246. Super Champ XD Stuck On Channel 2
  247. Appreciat Diagnostic Help for Old Roland Orange Cube-60 Guitar Amp
  248. Help: Removing cap cans heavily soldered to chassis on Traynor YGM-3
  249. AVT150H Valve Replacement
  250. Vox JMI AC30 (1964) Servicing