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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Trace Elliot TA100R schematic
  2. Heater voltage too high!
  3. laney vc30 wooshing noise
  4. Dead Blues Deville
  5. no Name tube amp acting strange
  6. Matchless DC30: noise, pops and scratchy volume pot
  7. Marshall AVT150HX Schematic
  8. Selenium rectifiers
  9. isolation transformer - high voltage.
  10. Marshall Valvestate 100 Problem Please Help :)
  11. Marshall V8080 pot list
  12. Ampeg VL-503 schematic
  13. Cap wiring help please.
  14. Filter Cap Values?
  15. Ampeg B-100 (solid state)
  16. Hot Rod Deluxe is too hot (accoustically)
  17. Gibson GA79RVT Reverb motorboating
  18. fender stage 112 "pop,crackle"
  19. Vox AC-30/6 TB problem
  20. About biasing tube guitar amplifiers
  21. problem with an ENGL Sovereign amp
  22. Mesa Mark IV problem
  23. Rumble 100 schematic
  24. Multicap sources?
  25. AC15 questions
  26. Brown Deluxe plate voltage
  27. Peavey 6505 Plus on tour
  28. Fender red knob twin pops when using push pull pots...
  29. EH BassBalls problem
  30. AC30/6 TB constant feedback
  31. Testing Caps
  32. 1 6L6 (of 6) at 2x bias Super Twin Reverb
  33. SVT CL cuts out. Speaker Cab or Amp??
  34. Reverb pan for a R12R Reverberocket???
  35. Princeton Reverb and unwanted Distortion
  36. Crappy input jacks on 65 Deluxe only lasted 43 years.
  37. Sunn Beta Lead Popping 6 amp fuses
  38. Major thanks to Enzo - Vox driver transformer reingineered
  39. Piezo Tweeter - Rumble 100
  40. LM3886 chip - why no work?
  41. Peavey XR-700
  42. Acoustic 370 troubleshooting help
  43. Ampeg VT-40 woes
  44. Fried Marshall MG100HDFX! PLEASE HELP!!!
  45. Ampeg V2 Head that needs something....
  46. 'evil' twin with no sound or pilot light
  47. Peavey Classic 30 switch to Celestion V30, G12H?, Hellatone? AGH!
  48. Peavey Classic 50/410
  49. need help - Old cap can ID
  50. Seymour duncan 84-40 intermittent voltage drop
  51. Stray capacitance???
  52. Same old same old...popping cathode bypass switch.
  53. Peavey Classic 20 distortion when warm
  54. PSU -ve rail voltage drops under load
  55. Question about speaker polarity
  56. Marshall JTM60 malfunction
  57. Gibson Lancer...help?
  58. SJ68568 to-3 output x-istor
  59. Filament balance pot
  60. JCM900 running real hot!
  61. Valve Fuse keeps blowing on my sovtek - need help
  62. Fender 125W Princeton Chorus w/Loud Buzz
  63. Red plating Vox AC
  64. Desperately seeking schem and photo of Guild 99J amp
  65. Need help with Fender Stage 100
  66. popping sound
  67. SS Ampeg B100 schematic?
  68. HIWATT vs. SUNN
  69. Eurodesk MX3282A schematic
  70. Danelectro DS100 schematic?
  71. Vox 4120 or 7120 schematics
  72. too much crosstalk??
  73. Carvin bridge rectifier
  74. "Broken" Musicmaster Bass amp question...
  75. Organ Amp
  76. twin reverb doesnt turn on
  77. Marshall 275 AVT Problem
  78. Ever do this?
  79. 70's silverface Twin Reverb squealing
  80. Pilot light bulb equivalents?
  81. Fender M80 : distortion
  82. 6G16 Vibroverb vibrato problem - red plating tubes!
  83. Hiwatt Lead 50R no quiscient current
  84. Bad L-Pad SWR?
  85. Issues with my Fender Stage 160
  86. Lost my Impedance Selector Switch
  87. Hiwatt Lead 50R cannot remove chassis!
  88. Transformer Troubleshooting
  89. Marshall Valvestate 8040 sound dies
  90. 5150 combo - New GT-6L6C Power Tubes
  91. Schematic For Marshall MG 250?
  92. 5150 combo standby led stays off
  93. Old Fender Twin Buzz in Reverb
  94. How do you install Transistors
  95. fender red knob "the twin"
  96. Problems With Ampeg Svt2 Pro
  97. Fender Stage 160 problems
  98. Reverb on a 1982 Musicman 112RD50 not working
  99. Marshall Silver Jubilee switching issues
  100. SWR Studio 220 - dead
  101. Ampwares
  102. Fender stage 100 DSP Head need help
  103. using coax cable or input
  104. Cap Job
  105. Boogie MarkIIB going sour
  106. Vibrosonic Reverb Vibrato Problem
  107. PING: Enzo
  108. Vox AD15VT, Pwr amp works but now sound from input
  109. Crate XT120R "high" pot problem
  110. Maestro Phase shifter - Splat sounds
  111. Strange power section problem
  112. Hiss in BF Bassman build
  113. Traynor YGM3 distorted reverb
  114. Peavey Classic VT 212
  115. Bass amp crackling noise
  116. Peavey XR 600B no power to front panel
  117. Blackface Fender Twin rattle
  118. Buying an Oscilloscope
  119. Crate BX-15 Dead
  120. Laney VC30 Low volume problem
  121. Where to buy PCB-mount pots?
  122. Crate BX-2115 schematic
  123. Yorkville XS800H (hiss) need advice
  124. Peavey Delta Blues 210, tremalo won't cut off.
  125. Screwed up!
  126. blues deluxe problem
  127. budda Super Distortion 30/Ring Modulator
  128. Peavey Delta Blues: Weak Vibrato
  129. jtm60 output transformer
  130. Traynor Ygm-3 Broken - Need Help!
  131. Ghost in the 18 watt
  132. Mu-tron Biphase - no effect
  133. SF Bassman - unwanted distortion
  134. Peavey Express 112 schematics
  135. quick smt question
  136. low volume on vibrato channel
  137. ID this switch for a Mutron AutoWah w/photo
  138. Hickok 532 Tube Tester--How to test 6BQ5, etc.
  139. GK1001rb Schematic Wanted
  140. Bias circuit problems...
  141. Swr 350
  142. Wierd hum in Peavey Transformer
  143. Marshall 8040 (V40) problem
  144. chassis and head dimensions ?
  145. Vibro-Champ Help
  146. Ampeg vt40 combo old enough to smoke
  147. Capacitor substitutes?
  148. Fuse popping...
  149. why put 150R on cathodes a Bandmaster Reverb
  150. My 66 bassman is cutting out intermittently and is making a blip blip blip noise?
  151. fender hotrod deville 212 trouble! (no power)
  152. Emc S300
  153. Polytone Mini 12L ICs...
  154. Peavey Century 120 Bass Head Help
  155. Gibson GA18T blowing fuses
  156. GRO100 Intermitant Fuse Blowing
  157. George L Cables
  158. 5E3 tone mods
  159. Noisy Ampeg SVP preamp hummmmmm~
  160. Deluxe Reverb Microphonic?
  161. Is this a symptom of a blown OT?
  162. AMPWARES - anyone know where they went
  163. Peavey Decade schematic
  164. Solid State amp not working-Help!
  165. Quick circuit testing question...
  166. Volume loss in MVA 500
  167. Scratchy gain pot
  168. Ibanez Starfield VT-100
  169. TSL100 Woes: PT2
  170. Lab Series compressor
  171. resistive load to tests?
  172. fuse flows
  173. lound crackling sound on clean channel
  174. Need Help! Channels Switching Automatically?
  175. Ampeg V4BH
  176. Links to Vox schematics
  177. Preamp positions for DSL and TSL
  178. Epiphone Blues Custom = Dead?
  179. Testing Capacitors
  180. marshall lead 12 3005 no crunch
  181. Hum increase with modded EV Jr.?
  182. Marshall DSL 100 - Nothing!
  183. TSL100- V6 not firing up!
  184. 1966 Ampeg Gemini V - low output and horrifying distorted sound
  185. Peavey Bandit 112 low volume
  186. Troubleshooting an RE-201 reverb unit
  187. How well do tube testers work?
  188. Biasing a Crate VC50
  189. Looking for SWR Strawberry/California Blond II Schematics
  190. peavey cs 800 wiring
  191. Valvestate 8080 Low gain on Boost Channel
  192. Replacing speaker in Rickenbacker 2x15?!
  193. Schematic for a Regal R-1160 tube amp
  194. Mashall Valvestate 8080 Issues
  195. fizzy static through AC30 TB
  196. Baldwin C1 problem...the one with the colorful push-buttons
  197. Fender Deville - Same Issue, New Question
  198. Amp cabinet rattle
  199. im getting shocked!!!
  200. transistor matching question
  201. Classic 20 repair manual
  202. Silvertone 1448 Transformer questions
  203. Peavey mace no output
  204. Classic 30 blowing fuses...
  205. Mesa Boogie reverb madness
  206. Bad sound out of my 1964 Princeton
  207. Ampeg b12xt
  208. Noisy Traynor TR-2 reverb tank
  209. JCM900 - urgent advice needed
  210. Counterfeit pwr x-istors
  211. 2uf 25v Caps
  212. JMP-1 Midi Trouble
  213. Mesa Dual recto Questions
  214. Schematic for a Guild Thunderstar Bass Amp 1969... Please..
  215. standby light stays on
  216. 16/32uF 475v Caps?
  217. Sovtek mig 50 issues ?
  218. low frequency buzz from speaker
  219. SF Champ lost headroom
  220. SWR Workingman's 10 and TDA7293
  221. Ampeg SVT-4 schematic anyone?
  222. Ampeg transistor?
  223. Fender Princeton 65 DSP Problems ???
  224. What would you do with a CBS 70w Super Reverb?
  225. a bunch of hiss in preamp
  226. Fender HR Deville Issue
  227. SPDT channel switch pops
  228. Jumpy master volume
  229. Valvestate 8280 shorting problems, need troubleshooting help
  230. Chorus weirdness.....
  231. could someone help me out?
  232. Improving Halfwave Rectifier Question
  233. OT transformer feeding back
  234. jcm800 clone with noise
  235. dirty dusty amp chassis and circuit.
  236. Help debugging my mesa boogie studio preamp
  237. Marshall VS100 Combo Cutting out after a few minutes
  238. Kalamazoo Model One failure...
  239. Peavey Butcher dead
  240. Valve Junior-intermittent cutting out
  241. Messy bogie DC3
  242. Fender Bass Amp Blues
  243. quickest/easiest way to test zeners?
  244. Silvertone 1466 schematic?
  245. Ideas on '67 Bassman problem......
  246. Peavey Deuce schematic?
  247. Roland Cube60
  248. Laney Pro Tube 50 (lead) schematic
  249. Fender deluxe 90 prob....any fender techs?
  250. Rewiring US Marshall for Europe