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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Reverb tank for Kustom 50
  2. Marshall JCM 900 4100 Fading
  3. I can't fix anything for finding more stuff
  4. 5150 Power board problem
  5. hartke LH1000
  6. Massive hum - B-15N
  7. Super Reverb cooks Reverb Driver 12AT7
  8. Laney amp problem
  9. Sunn 300T replacement pot?
  10. Acoustic 470 Guitar/Bass amp
  11. Dead PT
  12. Why does the Pro Jr sound so much thinner than a Princeton Reverb ?
  13. Twin Reverb 15 Popping/crackling on startup
  14. Peavey XXL cutting in/out
  15. SWR LA15 complete schematics
  16. tantalum replacement in Kustom 200
  17. Marshall MG50DFX No sound from main input
  18. On tour in Europe, need help with Sunn 300T
  19. Tube Amp Hum, No Sound
  20. Carvin R1000 Bass Amp Poroblem
  21. Help! Can't rock until this is resolved!!
  22. trying to chase and kill hum in tube echo and reverb
  23. Fender Bullet problems
  24. Rivera Knucklehead switching problems
  25. Mesa Bass 400 preamp voltages WAY too high!?
  26. Peavey session 400 (210 Watts) Capacitor Problem!
  27. Peavey Bandit loud popping
  28. Noise problems with new Vox AC100CPH Classic Plus
  29. Large Radial Caps
  30. How to measure bias in a Fender Pro Junior (1ohm resistor)
  31. another noisy Silvertone 1484
  32. Ampeg SVT-VR&CL popping intermittently
  33. Reverb Tank Suitable Replacement - Acc. Type 1 Tank
  34. Super Beatle Caps Question
  35. volume problems with a first amp build
  36. Ampeg SVT-VR&CL ground loop hum solution
  37. 5E3 kit - preamp hum
  38. Intermittent, volume independent crackle on Fender Deluxe Reverb (w/ mp3)
  39. Ampeg V7 reeverb problem
  40. 5150 Screen Grid RESISTOR/Tube question...
  41. SF Bassman 100 hum problem
  42. GK 400RB mark IV
  43. Fender Prosonic SERVICE Manual / Components List sought
  44. Using a variac
  45. EH EL34 heater-cathode leakage
  46. Randal RG200 G3
  47. Rickenbacker TR35B amplifier
  48. Rhodes Suitcase Dual 50W amp
  49. Help, Road King Clean Channel volume drop after oscilloscope method tube check
  50. Peavey Mace Question
  51. Static - Bad OT?
  52. HiWatt DR103 problem
  53. Problems with a new Fender BandMaster V Series! Uggh!
  54. Harsh sounding high notes (first tube preamp)
  55. Randall RG200 G3 Low power
  56. Screen resistor voltage drop
  57. Marshal Valvestate Model 8100 Trouble
  58. crate-gx212 problem need help
  59. Ampeg b-100 problem
  60. Peavey 600F mixer amp problem
  61. Peavey mace
  62. Hot Rod Deville.. please help!
  63. Parts Salvage Question
  64. Bassman AB165 midrange hiss
  65. Shorted Reverb Tank Causes Distortion
  66. regulated AC PSU
  67. Hotrod Deluxe Problem
  68. Wurlitzer 200 Power transistors.
  69. Sunn Model A
  70. Dr. Z kt-45 question
  71. Peavey C30: noise forever ?
  72. TDA7293 replacement in an AVT150
  73. Anyone got a schematic for a Crate TV-6212?
  74. Help and ideas for repairs to Ampeg B2r
  75. Refurbishing a Peavey KB60
  76. Optical pedal repair
  77. RI 65 Twin Reverb with excessive feedback
  78. Strange coupling capacitor problem
  79. peavey tko 115 bass amp circuit
  80. Soldering question
  81. QSC mx2000a
  82. Music Man HD 212
  83. Ashdown MAG600 volume?
  84. VYPYR 30 -No Input audio...
  85. Fender Deluxe Reverb 65, swapped 6v6 and rectifier tube by mistake
  86. When to start repair.
  87. Peavey Special 130 blowing fuses
  88. crate bfx100 blows fuses - possible dc in output
  89. peavey kb100
  90. Help with questions to ask Amp Tech & request list
  91. Help Me Solve This Power Amp Riddle
  92. Throw out bad speakers?
  93. Bassman 10 (70?) PT question
  94. Peavey Renown , howling
  95. SWR SM 400 left channel distorted
  96. volume drop when negative feedback is doisconnected
  97. AVT-50 hum
  98. Morley PFL xformers
  99. New Pot for Fender Blues Deluxe?
  100. Weird DSL +/- 15v supply problem.
  101. Twin Reverb Problems
  102. Boogie Mark I reissue intermittent
  103. AAARRRRGGGHHH! 5150 Question(s)!
  104. 5E3 low feedback/oscillation, stumped???
  105. crackling sound in tube amp
  106. Garnet Mach 5 from 1969
  107. growing bias
  108. Valves for Ashdown FA 60 DSP Head
  109. Problems with a Peavey Classic VTX 65 watt amp.
  110. impedence rule of thumb?
  111. Electrolytics for signal path restoration?
  112. Unplugged speaker protection & line out
  113. dying Mesa nomad 100
  114. Marshall JTM 60 filter cap problem
  115. Marshall VS100 - high pitched squeel
  116. Marshall SL100 Bass Knob Not working
  117. Vox DA15 problem
  118. '76 Princeton Reverb reverb tone/level mod?
  119. Peavey Audition CHORUS request
  120. peavey bandit 112 II
  121. Epiphone Blues Custom Rectifier prob
  122. Ampeg GU-12 tremolo problem
  123. 1978 Marshall
  124. Qsc mx2000a
  125. Ampeg svt classic help
  126. Dual Showman low freq oscillation
  127. Sessionette:75 - Celestion G12-80 dead?
  128. Marshall MG50DFX Blown fuse
  129. Capacitor rated in watts
  130. AMPEG SVT 3 Pro
  131. Need help with my burn Boss-Ch1
  132. AC filiments with one side grounded
  133. no tone no top superlead
  134. Pro-Reverb scratchy vol & bass pots
  135. White Amplification Little Rock
  136. Marshall MG100DFX Unusually Low Volume
  137. Bugera 333 XL 212 gives an extra buzz-sound
  138. Toa D-3 what is Q507?
  139. combo amp speaker question
  140. Power Transformer oddity
  141. my dad wrecked my amp
  142. DeVille no Reverb
  143. diode manufacturers?
  144. Silverface MV Twin Hums On Reverb Channel
  145. Acoustic 470 Repair Issue
  146. Ampeg SVT-3 Pro -- Smoking Toroidal
  147. Goofy Gibson Amp
  148. Guitar Research T60R Zener Diode values
  149. M-80 fade out
  150. Speaker cabinet impedance question
  151. Curious thing on bottom of Ampeg VT-22 cabinet...
  152. Problem with 2003 Marshall JCM 2000 TSL100
  153. Hartke 3500 BJT
  154. AD15 no sound
  155. Marshall 5002 Lead 20 Gut Pic !! - Tech Advice -
  156. Vox Royal Guardsman 1131 problem
  157. blues deluxe reissue problem
  158. AVT-150 repair thread
  159. Older Epiphone amp
  160. Trying to find VOX part
  161. Ampeg BA-115 Crackle/static
  162. MG30dfx headphone jack
  163. 71' Marshall super lead, Replace capacitors?
  164. Peavey Heritage VTX
  165. Problem with my Fender Hot Rod Deluxe
  166. dying amp
  167. Peavey Data Bass
  168. DSL 50 no sound...help
  169. Yamaha EMX660
  170. Help!! Bad Speakers Killed My Amp?
  171. '71 Fender Deluxe reverb Vibrato question
  172. Balanced triodes in PI of Peavey VK's, is it of any use?
  173. Help w Volcano hot EL34 on Music Man 210HD 130
  174. JCM2000 DSL 50 low volume
  175. '71 Fender Deluxe reverb question.
  176. Kitty Hawk preamp repair driving me nuts!!!
  177. Speaker Cab Impedance Question
  178. bug dissected
  179. DSL Hum on Lead Channel
  180. Help: External speaker jack on drri, dead
  181. Gorilla amps: Info on a 10-watter
  182. troubleshooting an Ampeg VH-140C
  183. Deep fried Mc Gretsch! model 7885
  184. Troubleshooting tremolo on a Twin Reverb
  185. Old Fender Blues Deluxe
  186. Got a jvm410 H in and it makes an awful hum on od1 and od2 channels
  187. SFdeluxe with no tremolo
  188. Calculation for heater current
  189. tsl122 pc board
  190. Microphonic tube vs. fillament rattle
  191. Marshall footswitch
  192. GK800RB & Phantom power
  193. Hartke 3500A fault
  194. Ampeg VT-60 bias issue
  195. TSL Clean Channel Buzz
  196. Marshall 1987S Hiss/Hum Problems
  197. "Dorothy, the Evil Twin Is Dead!"
  198. Fender FM 65
  199. Peavey Classic 50 help
  200. Ampeg SVT 4 Pro Board Layout diagram
  201. B-52 At-100 Transformer
  202. Hafler P225 amp has goofy problem
  203. SWR W/M15 Combo hot component
  204. newtronics signal generator
  205. The heater cable toasted
  206. Powered speaker schematic needed
  207. Blues Junior ribbon wiring change
  208. No sound from Marshall MG50dfx
  209. Trouble with my Peavey Classic 30...suggestions?
  210. Sovtek blowing fuses
  211. Marshall Footswitch Conversion Possible?
  212. Marshall MG100hdfx Problem
  213. My VJR Voxy build didn't work, help?
  214. Stupid mistake on my Ampeg B-25
  215. BF Princton Reverb PT Question
  216. Mesa boogie mk iv gone silent!!
  217. crackling sound on my SF super reverb
  218. Silvertone OT
  219. Marshall problem
  220. Fender Acoustasonic Junior - What is wrong with my spring reverb?
  221. Dynacord Eminent I
  222. Another B-25 Question
  223. Benchtop smoke absorber?
  224. Good place to buy parts?
  225. Tektronix 475 Oscilloscope
  226. MARSHALL AVT 150H sometimes works
  227. Grundig tone circuit
  228. 7027A's
  229. Hartke 3500 MOSFET output transistor
  230. Fender FM 212r low level hum
  231. new motherboard for dsl still not working
  232. Tubes warm but not hot?
  233. Mesa M-Pulse 600 BIAS
  234. Ampeg B-25
  235. SWR Workingman's 15 - weird crackle
  236. Ampeg SVT 3 PRO crackling and popping
  237. SOLDANO designed amp/Yamaha
  238. Fender Deville with slight oscillation/flange sound
  239. fender concert 81, clean gets dirty after on awhile
  240. Yamaha T100C
  241. crate rfx120 hum
  242. Bugera 22V?
  243. Power transformer voltage question
  244. Heater wire miswiring fast diagnosis
  245. JCM 800 2203 weird problem
  246. Fender Stage Lead II 2-12
  247. Fender convenience outlets miswired
  248. Peavey Classic 50/50 - Eating Valves (very bright red!)
  249. Kustom Kasino head preamp board
  250. Marshall MG100HDFX. super help needed.