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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Marshall MG100HDFX repair?
  2. my mg100dfx problem
  3. Testing OT's
  4. Engl Fireball Trouble
  5. Fender PCB pots
  6. Solder/Desolder Station
  7. Marshall JCM 2000 reverb query
  8. Power tranny gets HOT in old Guild amp
  9. Ampeg SS-70CA schematics?
  10. Bias Circuit Problem
  11. Peavey Valveking switching help!
  12. Crate VC120H schematic needed.
  13. New Guy, 5150 question.
  14. JTM45 build - channel volume problem
  15. Hartke 3500 MOSFET Output Transistors
  16. power tran buzzing
  17. Peavey Classic 30, no sound until turned off.
  18. 1950's Ampeg Amplifier
  19. DSL Hum, C46 question
  20. Rivera Clubster 45 hissy
  21. mesa oscillation
  22. Quick Questions Acoustic 370 head
  23. Troubleshooting noise issue
  24. JMP-1 Faulty
  25. Epiphone Valve Standard- Please Help?
  26. troubleshooting ?- Hum
  27. SVT-VR bias issue
  28. Crate G20 XL SCG Circuit Problem
  29. HRD plate load resistors, anything else?
  30. Marshall MG50DFX level problem
  31. Terrible fizzing
  32. Peavey Mace Question
  33. Is this circuit ok or has it been hacked? Please advise (vintage tube amp)
  34. Princeton Chorus Breaks up on clean channel, chorus gets stuck...
  35. peavey century 200 bass series
  36. Underfiltering??
  37. Masco MAP-120N
  38. Mesa Boogie Mk3 Schematics, layout etc
  39. Blues Deluxe low volume no clean
  40. TL072 or 4558 in a Blues Jr Reverb
  41. Hot Rod Deluxe 6L6WGC too hot?
  42. Ampeg Gemini II wiring help needed
  43. 5E3 tweed deluxe home build just died
  44. Legend A 30 amp
  45. VoxAC30 CC phase inverter problem?
  46. JCM2000 DSL wiiieeerrdd problem
  47. classic 50
  48. solid state problems
  49. XR700 Power Mixer clips, low volume
  50. Acoustic 122 schematic
  51. Laney LC50/2 PCB removal?
  52. bridge rectifier problems
  53. Trace Elliot TA100R schematic
  54. Heater voltage too high!
  55. laney vc30 wooshing noise
  56. Dead Blues Deville
  57. no Name tube amp acting strange
  58. Matchless DC30: noise, pops and scratchy volume pot
  59. Marshall AVT150HX Schematic
  60. Selenium rectifiers
  61. isolation transformer - high voltage.
  62. Marshall Valvestate 100 Problem Please Help :)
  63. Marshall V8080 pot list
  64. Ampeg VL-503 schematic
  65. Cap wiring help please.
  66. Filter Cap Values?
  67. Ampeg B-100 (solid state)
  68. Hot Rod Deluxe is too hot (accoustically)
  69. Gibson GA79RVT Reverb motorboating
  70. fender stage 112 "pop,crackle"
  71. Vox AC-30/6 TB problem
  72. About biasing tube guitar amplifiers
  73. problem with an ENGL Sovereign amp
  74. Mesa Mark IV problem
  75. Rumble 100 schematic
  76. Multicap sources?
  77. AC15 questions
  78. Brown Deluxe plate voltage
  79. Peavey 6505 Plus on tour
  80. Fender red knob twin pops when using push pull pots...
  81. EH BassBalls problem
  82. AC30/6 TB constant feedback
  83. Testing Caps
  84. 1 6L6 (of 6) at 2x bias Super Twin Reverb
  85. SVT CL cuts out. Speaker Cab or Amp??
  86. Reverb pan for a R12R Reverberocket???
  87. Princeton Reverb and unwanted Distortion
  88. Crappy input jacks on 65 Deluxe only lasted 43 years.
  89. Sunn Beta Lead Popping 6 amp fuses
  90. Major thanks to Enzo - Vox driver transformer reingineered
  91. Piezo Tweeter - Rumble 100
  92. LM3886 chip - why no work?
  93. Peavey XR-700
  94. Acoustic 370 troubleshooting help
  95. Ampeg VT-40 woes
  96. Fried Marshall MG100HDFX! PLEASE HELP!!!
  97. Ampeg V2 Head that needs something....
  98. 'evil' twin with no sound or pilot light
  99. Peavey Classic 30 switch to Celestion V30, G12H?, Hellatone? AGH!
  100. Peavey Classic 50/410
  101. need help - Old cap can ID
  102. Seymour duncan 84-40 intermittent voltage drop
  103. Stray capacitance???
  104. Same old same old...popping cathode bypass switch.
  105. Peavey Classic 20 distortion when warm
  106. PSU -ve rail voltage drops under load
  107. Question about speaker polarity
  108. Marshall JTM60 malfunction
  109. Gibson Lancer...help?
  110. SJ68568 to-3 output x-istor
  111. Filament balance pot
  112. JCM900 running real hot!
  113. Valve Fuse keeps blowing on my sovtek - need help
  114. Fender 125W Princeton Chorus w/Loud Buzz
  115. Red plating Vox AC
  116. Desperately seeking schem and photo of Guild 99J amp
  117. Need help with Fender Stage 100
  118. popping sound
  119. SS Ampeg B100 schematic?
  120. HIWATT vs. SUNN
  121. Eurodesk MX3282A schematic
  122. Danelectro DS100 schematic?
  123. Vox 4120 or 7120 schematics
  124. too much crosstalk??
  125. Carvin bridge rectifier
  126. "Broken" Musicmaster Bass amp question...
  127. Organ Amp
  128. twin reverb doesnt turn on
  129. Marshall 275 AVT Problem
  130. Ever do this?
  131. 70's silverface Twin Reverb squealing
  132. Pilot light bulb equivalents?
  133. Fender M80 : distortion
  134. 6G16 Vibroverb vibrato problem - red plating tubes!
  135. Hiwatt Lead 50R no quiscient current
  136. Bad L-Pad SWR?
  137. Issues with my Fender Stage 160
  138. Lost my Impedance Selector Switch
  139. Hiwatt Lead 50R cannot remove chassis!
  140. Transformer Troubleshooting
  141. Marshall Valvestate 8040 sound dies
  142. 5150 combo - New GT-6L6C Power Tubes
  143. Schematic For Marshall MG 250?
  144. 5150 combo standby led stays off
  145. Old Fender Twin Buzz in Reverb
  146. How do you install Transistors
  147. fender red knob "the twin"
  148. Problems With Ampeg Svt2 Pro
  149. Fender Stage 160 problems
  150. Reverb on a 1982 Musicman 112RD50 not working
  151. Marshall Silver Jubilee switching issues
  152. SWR Studio 220 - dead
  153. Ampwares
  154. Fender stage 100 DSP Head need help
  155. using coax cable or input
  156. Cap Job
  157. Boogie MarkIIB going sour
  158. Vibrosonic Reverb Vibrato Problem
  159. PING: Enzo
  160. Vox AD15VT, Pwr amp works but now sound from input
  161. Crate XT120R "high" pot problem
  162. Maestro Phase shifter - Splat sounds
  163. Strange power section problem
  164. Hiss in BF Bassman build
  165. Traynor YGM3 distorted reverb
  166. Peavey Classic VT 212
  167. Bass amp crackling noise
  168. Peavey XR 600B no power to front panel
  169. Blackface Fender Twin rattle
  170. Buying an Oscilloscope
  171. Crate BX-15 Dead
  172. Laney VC30 Low volume problem
  173. Where to buy PCB-mount pots?
  174. Crate BX-2115 schematic
  175. Yorkville XS800H (hiss) need advice
  176. Peavey Delta Blues 210, tremalo won't cut off.
  177. Screwed up!
  178. blues deluxe problem
  179. budda Super Distortion 30/Ring Modulator
  180. Peavey Delta Blues: Weak Vibrato
  181. jtm60 output transformer
  182. Traynor Ygm-3 Broken - Need Help!
  183. Ghost in the 18 watt
  184. Mu-tron Biphase - no effect
  185. SF Bassman - unwanted distortion
  186. Peavey Express 112 schematics
  187. quick smt question
  188. low volume on vibrato channel
  189. ID this switch for a Mutron AutoWah w/photo
  190. Hickok 532 Tube Tester--How to test 6BQ5, etc.
  191. GK1001rb Schematic Wanted
  192. Bias circuit problems...
  193. Swr 350
  194. Wierd hum in Peavey Transformer
  195. Marshall 8040 (V40) problem
  196. chassis and head dimensions ?
  197. Vibro-Champ Help
  198. Ampeg vt40 combo old enough to smoke
  199. Capacitor substitutes?
  200. Fuse popping...
  201. why put 150R on cathodes a Bandmaster Reverb
  202. My 66 bassman is cutting out intermittently and is making a blip blip blip noise?
  203. fender hotrod deville 212 trouble! (no power)
  204. Emc S300
  205. Polytone Mini 12L ICs...
  206. Peavey Century 120 Bass Head Help
  207. Gibson GA18T blowing fuses
  208. GRO100 Intermitant Fuse Blowing
  209. George L Cables
  210. 5E3 tone mods
  211. Noisy Ampeg SVP preamp hummmmmm~
  212. Deluxe Reverb Microphonic?
  213. Is this a symptom of a blown OT?
  214. AMPWARES - anyone know where they went
  215. Peavey Decade schematic
  216. Solid State amp not working-Help!
  217. Quick circuit testing question...
  218. Volume loss in MVA 500
  219. Scratchy gain pot
  220. Ibanez Starfield VT-100
  221. TSL100 Woes: PT2
  222. Lab Series compressor
  223. resistive load to tests?
  224. fuse flows
  225. lound crackling sound on clean channel
  226. Need Help! Channels Switching Automatically?
  227. Ampeg V4BH
  228. Links to Vox schematics
  229. Preamp positions for DSL and TSL
  230. Epiphone Blues Custom = Dead?
  231. Testing Capacitors
  232. marshall lead 12 3005 no crunch
  233. Hum increase with modded EV Jr.?
  234. Marshall DSL 100 - Nothing!
  235. TSL100- V6 not firing up!
  236. 1966 Ampeg Gemini V - low output and horrifying distorted sound
  237. Peavey Bandit 112 low volume
  238. Troubleshooting an RE-201 reverb unit
  239. How well do tube testers work?
  240. Biasing a Crate VC50
  241. Looking for SWR Strawberry/California Blond II Schematics
  242. peavey cs 800 wiring
  243. Valvestate 8080 Low gain on Boost Channel
  244. Replacing speaker in Rickenbacker 2x15?!
  245. Schematic for a Regal R-1160 tube amp
  246. Mashall Valvestate 8080 Issues
  247. fizzy static through AC30 TB
  248. Baldwin C1 problem...the one with the colorful push-buttons
  249. Fender Deville - Same Issue, New Question
  250. Amp cabinet rattle