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View Full Version : Maintenance, Troubleshooting & Repair



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  1. FRED Diodes For A Kustom 200B?
  2. SF 135Watt: Dropping the B+ voltage, and bias mod
  3. Silly Questions from a Twin Reverb owning DIY Newbie
  4. Need a little help with a Laney Gh100L
  5. Broken amp, need diagnosis help
  6. Roland Jazz Chorus 120 "Schematics needed asap"
  7. Fender Princeton 65 DSP - Low Volume and Hiss
  8. Dead Vibrato: Fender Twin Reverb Reissue
  9. Reverb issues w/ a Peavey Classic 30
  10. Post In Music Electronics - Link
  11. help with a Kustom 200B
  12. Valvestate 8080 issues
  13. ill amp 'crackles' into speaker ?
  14. Acoustic Model 123
  15. Motorboating issue
  16. Fender Acoustasonic II SFX problem
  17. Hartke 3500 relay problems?
  18. VOX AC30/6 TB scratchy static noise
  19. Help ID a Mains transformer for 135W Twin
  20. Signal tracing rules
  21. Fender Hot Rod Deluxe won't play!
  22. Hot Rod Dlx Fizzy artifact!
  23. need help fixing my fender fm 212r
  24. almost a 6G6 build
  25. Tech-Caps???
  26. Crate GLX65 Question; Working Amp w/ no Sound from Speaker
  27. Marshall DSL 2000?? SO confused!!
  28. re:Peavey XR600B
  29. Taking the next step in my builds and repairs.
  30. Swr la series chirps on power up
  31. Tonefullness of one cap over another
  32. Low V supply issue Firebass 700
  33. LANEY VH100r Power tranformer buzz fixed ...
  34. Polytone - blown power transistor
  35. wave -like sounds
  36. marshall avt 150 h
  37. Crate GX-15R doesn't work - Any ideas?
  38. rca soldering
  39. Deluxe Reverb Mod or mix-up?
  40. Fender Twin Hum Hum Hum
  41. Major goof, major problem OT
  42. Crate V50 ?
  43. Ampeg SVT5 Pro
  44. High-Frequence Noise at Roland Bolt-30
  45. What Reverb Tank for a Yamaha Fifty 112?
  46. Power Amplifier Repair
  47. Problem with Fender Princeton DSP
  48. Peavey VTM 60 Blows fuse
  49. clean channel gone on my little Fender Champ 30 - fixable?
  50. Ampeg SVT 5 Pro
  51. redplate/biasing issue
  52. Behringer GMX212
  53. Amp/Guitar Temperature Sensitivity
  54. fizz and oscillation in Peavey Rockmaster head
  55. Classic 50 tube biasing?
  56. i have damaged my Crate VFX,please help..
  57. 6G12-A Concert clone behaving oddly
  58. Roland Cube 60 -- missing reverb
  59. Peavey Heritage VTX Series
  60. Blues DeVille reissue squealling preamp
  61. Substitute GZ34 for 5U4GB?
  62. Princeton Reverb Re-work
  63. No sound from speaker..?
  64. AC at pin 8 on a 6V6
  65. Pot replacement....I got "shafted"
  66. Keeps blowing the fuse
  67. Blues deluxe..same ole' problem
  68. Color coded capacitor
  69. Miscellaneous Question About Amp Damage
  70. Weber 6a14hp buzz when reverb is on.
  71. line 6 flextoneII hd head problem
  72. Ultimate Chorus
  73. Guitar Research T64RS TUBE
  74. Roland Bolt 60 reverb tank?
  75. Fuse Pops - Transformer Dead
  76. Orange rockerverb owners?
  77. Lafayette (or Univox??) U-80A mystery amp
  78. identify a transformer
  79. Bassman 100 - Should it be louder?
  80. Super Champ XD
  81. Amp Tech Needed in So Cal...
  82. Fender Princeton Chorus problems
  83. Marshall MG100dfx
  84. Marshall Super lead 1959 Problem
  85. JTM45 Build Buzz Problem
  86. Svt 4 pro tubes??
  87. Question about Marshall Valvestate 8100
  88. Marshall JMP 50 watt bias
  89. Traynor yvm-1 voice master acting funny - - -
  90. Fender Concert II problem ( preamp)
  91. Sticker on power tubes? Harmful?
  92. Need pot volume control for op pro preamp Ovation Guitar
  93. Marshall AVT150 Blown Fuses
  94. Diodes for a Twin
  95. Hiwatt Classic 50 Crackling when cranked
  96. NOS 6L6 vs Currently made 6L6
  97. More failed Jamicon 12,000u 80v
  98. Fender Super Reverb AA763 Bias
  99. marshall 8080 pot problems
  100. Need help with Fender Twin Reverb
  101. Vibrolux low volume
  102. Slightly off topic, but strange
  103. High voltage on pin 1 of V5 in '67 Super Reverb
  104. Powering vtl5c1 from heaters on SLO 100 ?
  105. Fender Twin loud reverb hiss
  106. Awful noise from Fender Bantam Bass
  107. power noise parkg10r amplifier
  108. HomeBrew Troublshooting Help
  109. Silvertone 1484 help needed
  110. PEAVEY BRAVO 112 crunch channel bad switch?
  111. 78 Crate CR-1R, 72 Gibson G20, 2006 Randall RG 100 G3 100 watt valve dynamic
  112. Ampeg svt cl hum issues
  113. Polytone Mini Brute lll, lV, M-PA
  114. Need help trouble shooting peavey xl-500 mix amp
  115. Serious ?grounding? problem - kind of scary...
  116. Silvertone 1484 diode substitutes
  117. Trouble with Peavey Backstage 110 amp
  118. '67 Ampeg Jet, no trem & high voltage
  119. Buzz/click!-dead when switching off standby
  120. New Matamp schems
  121. Where to get replacement parts for a Fender Twin Reverb?
  122. Phase linear 700b help!
  123. Complete newbie to amp repair
  124. Peavey TNT Fuse blowing
  125. Park G10 amp at 4Ohm Speaker?
  126. Need schematic for a Crate VC6112
  127. Crate Blue Voodoo 120H acting up:
  128. Mesa DC-5, Massive Hum on Clean Channel
  129. My gibson amp
  130. Peavey Classic vtx series- Troubleshooting repair help needed!!!
  131. fender studio lead amp problem
  132. Dear god not the Selmer again... & PPIMV...
  133. Peavey VT Classic 212 Broken Phase Help
  134. Yamaha G50-112 owners manual wanted
  135. marshall atv100 have no distortion?
  136. Palomino V8 loud hum.
  137. 5e3 volume interaction
  138. SWR workingmans 15 Frying resistors
  139. 59 Bassman reissue cuts out after 10 minutes
  140. Crate Vintage 30
  141. peavey 5150 212 won't power on
  142. SVT 350 XLR out HUM
  143. 65 Twin Reverb Vibrato Problem. Please Help
  144. Ampeg SVT-6PRO death & resurrection
  145. Sunn Sceptre
  146. Blue Voodoo clean channel hiss without volume
  147. Peavey Ultra switching pops
  148. peavey400bh
  149. Princeton speaker rattling in the breeze
  150. solder type ????
  151. Randall RG200
  152. Fender Pro Tube Pro Reverb - Dead Tremolo and Noisy Reverb
  153. Fender Bassman
  154. Ampeg VL502 problem
  155. Power xfrmer wire color? Help!
  156. Could someone explain how this amp was working?
  157. fender stage 100 dsp 112 combo
  158. Peavey KB60 acting up
  159. overheating resistors
  160. please tell me its not a crate
  161. 5150iii channel two compressing
  162. Randall RG50TC problem
  163. how dangerous are floating ground amps (old Supro)
  164. volume loss Crate V32
  165. volume loss Crate V32
  166. Fender Stage 100 DSP
  167. Squire Champ 15/Fender Frontman 15(R)
  168. svt 4 pro going mute
  169. VHT Pitbull 50/12 Issues... Help!
  170. Peavey Studio 210
  171. B-52 AT100 very low volume/fuse blows when standby turned off
  172. Behringer GMX212 amplifier problem
  173. anyone have pic of cts alnico 10' speaker?
  174. Peavey Transtube Supreme Schematic
  175. Help me understand
  176. Channel 2 Fading Out
  177. 61 Reverberocket Reverb Problem
  178. More on Marshall TSL100
  179. Switched Tube Consequences?
  180. Can pulling tubes out one at a time help you locate hum?
  181. Burning 6L6 screen resistors
  182. Please help Marshall jmc 800 (2205) loud hum running out of things 2 look 4.
  183. Ampeg B4R Issue
  184. Replacement power transistors for old JC-120?
  185. Bridge Bad, Would You Replace Regulators?
  186. Diode question
  187. 59' reissue troubles, cracks and hisses
  188. Working Man's 12 blows fuse
  189. barcusberry 1601
  190. Mesa Express - Switching the transformer
  191. Wrong Transformer in Vibro Champ?
  192. Musicman 130 (2275-130) problems
  193. Locating loud hum/noise
  194. Damper diodes as rectifiers
  195. Fender Twin blowing fuses
  196. Fender Twin amp nasty buzz
  197. 16mm 10K Pot for line 6 source
  198. Marshall DSL 100 reissue - hum
  199. Isolation Transformer help
  200. 4x6L6 heater troubles
  201. G80rcd marshall
  202. 5F1 Distortion Like Blown Speaker
  203. Fender Hotrod Deluxe noice
  204. Acoustic 125 guitar combo issues.. no output!
  205. SS amp blues...
  206. Unknown orange PT wire
  207. Deluxe Reverb FAILED at gig!
  208. Peavey Classic30 troubleshooting help please
  209. Crate GFX 120 - Constant hum
  210. Ampeg GT10 Xsistor part number
  211. Help with hum in Vox AC15H1TV
  212. troubleshooting Ampeg B-15-N
  213. Trace Elliot lamp
  214. Hot Rod Deluxe...low volume, weird voltages
  215. Peavey Classic 50 2/12 question
  216. Bogner Alchemist
  217. Trace Elliot GP12
  218. Model T Reissue (Fender) w/ hole burnt in PCB... PT ok?
  219. Bassman 100
  220. SE 5F1-type bias ?
  221. Marshall JMP1 Preamp Clean Channel problem
  222. Fender Deluxe 900 static
  223. Vox AC4TV Buzz Problem
  224. 5F6-A Choke Problem/Questions?
  225. Faulty Laney VH100R
  226. Identify Vox capacitors?
  227. Power transformer gurgling
  228. crate TX50a limo
  229. Radio station coming in through Amp
  230. PCB Trace Repairs
  231. tech question on crate bx-100
  232. Vypyr, almost no low end... mods?
  233. marshall mg100 hdfx mute circuit ??
  234. farty bass problem, Bassman 10
  235. Mackie SWA1501
  236. Problem Behringher PMP 1280s
  237. Sunn Col 300 one thing after another...
  238. Fender red-knob "85" Cracks up.
  239. peavey triumph 60 lost gain channels
  240. Behringer MX 3282A mixer, no output
  241. Super Reverb Bias?
  242. Bad Buzz
  243. Marshall JCM 2000 DSL bias help
  244. Peavey Transtube EFX 212 Lost Balls, static distortion
  245. Ampeg SVT Classic - How Much Background hum is "normal"?
  246. Mesa Heartbreaker Head
  247. no sound from an AB763 clone
  248. Ampeg SVT4 Pro repair
  249. Bias adjustment SFSR
  250. Repairing an old Crate VC-3112W