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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Marshall AVT150H Blowing Fuses
  2. Berhinger PMP 5000
  3. Help with channel switching on the dreaded JCM2000DSL 100
  4. Tubes Help
  5. Peavey Combo 300 no output
  6. Ampeg v2 red plate help!
  7. Crate VC50 hot tranny/slight hum...
  8. Carlsbro 60 watt twin channel
  9. Stagepas 300
  10. Marshall JCM 2000 Super Lead - won't turn on
  11. Fender HR DeVille probs...
  12. Best High Current Connector
  13. Marshall Specialist tremolo not working
  14. Some info. On Line 6 AX2?
  15. Super Reverb Attempt to Clone with ugly distortion
  16. Sunn 300T signal gain
  17. Crate VC-3112 stuck on B channel. Help please.
  18. Crosstalk channel bleed trouble shooting
  19. Marshall AVT150H Repair help needed.
  20. "The Twin" Fender Amp bias adjust
  21. Crate V-100h Head Died
  22. Bugera Problem
  23. Dean Markly CD-30 Tube Amp has me baffled...
  24. Roland JC 120 effects loop
  25. Fender Performer 1000 problems
  26. Behringer PMH2000 schematic
  27. princeton: polarity switch modded for standby?
  28. fender amp problem
  29. another Hartke Overheating Post
  30. Laney AOR 100w first series, 505 volts on the plates ?
  31. jtm30 bias mod problem
  32. Marshall VS100 combo - occassional overpowering buzz
  33. Fender Transformer Problem
  34. Music man 2275-65 ss phase inverter issue?
  35. Ampeg SVT II Pro - help needed
  36. Ampex ATR-700 trim pot
  37. marshall 8080 low level hum
  38. Reverb tank for Kustom 50
  39. Marshall JCM 900 4100 Fading
  40. I can't fix anything for finding more stuff
  41. 5150 Power board problem
  42. hartke LH1000
  43. Massive hum - B-15N
  44. Super Reverb cooks Reverb Driver 12AT7
  45. Laney amp problem
  46. Sunn 300T replacement pot?
  47. Acoustic 470 Guitar/Bass amp
  48. Dead PT
  49. Why does the Pro Jr sound so much thinner than a Princeton Reverb ?
  50. Twin Reverb 15 Popping/crackling on startup
  51. Peavey XXL cutting in/out
  52. SWR LA15 complete schematics
  53. tantalum replacement in Kustom 200
  54. Marshall MG50DFX No sound from main input
  55. On tour in Europe, need help with Sunn 300T
  56. Tube Amp Hum, No Sound
  57. Carvin R1000 Bass Amp Poroblem
  58. Help! Can't rock until this is resolved!!
  59. trying to chase and kill hum in tube echo and reverb
  60. Fender Bullet problems
  61. Rivera Knucklehead switching problems
  62. Mesa Bass 400 preamp voltages WAY too high!?
  63. Peavey session 400 (210 Watts) Capacitor Problem!
  64. Peavey Bandit loud popping
  65. Noise problems with new Vox AC100CPH Classic Plus
  66. Large Radial Caps
  67. How to measure bias in a Fender Pro Junior (1ohm resistor)
  68. another noisy Silvertone 1484
  69. Ampeg SVT-VR&CL popping intermittently
  70. Reverb Tank Suitable Replacement - Acc. Type 1 Tank
  71. Super Beatle Caps Question
  72. volume problems with a first amp build
  73. Ampeg SVT-VR&CL ground loop hum solution
  74. 5E3 kit - preamp hum
  75. Intermittent, volume independent crackle on Fender Deluxe Reverb (w/ mp3)
  76. Ampeg V7 reeverb problem
  77. 5150 Screen Grid RESISTOR/Tube question...
  78. SF Bassman 100 hum problem
  79. GK 400RB mark IV
  80. Fender Prosonic SERVICE Manual / Components List sought
  81. Using a variac
  82. EH EL34 heater-cathode leakage
  83. Randal RG200 G3
  84. Rickenbacker TR35B amplifier
  85. Rhodes Suitcase Dual 50W amp
  86. Help, Road King Clean Channel volume drop after oscilloscope method tube check
  87. Peavey Mace Question
  88. Static - Bad OT?
  89. HiWatt DR103 problem
  90. Problems with a new Fender BandMaster V Series! Uggh!
  91. Harsh sounding high notes (first tube preamp)
  92. Randall RG200 G3 Low power
  93. Screen resistor voltage drop
  94. Marshal Valvestate Model 8100 Trouble
  95. crate-gx212 problem need help
  96. Ampeg b-100 problem
  97. Peavey 600F mixer amp problem
  98. Peavey mace
  99. Hot Rod Deville.. please help!
  100. Parts Salvage Question
  101. Bassman AB165 midrange hiss
  102. Shorted Reverb Tank Causes Distortion
  103. regulated AC PSU
  104. Hotrod Deluxe Problem
  105. Wurlitzer 200 Power transistors.
  106. Sunn Model A
  107. Dr. Z kt-45 question
  108. Peavey C30: noise forever ?
  109. TDA7293 replacement in an AVT150
  110. Anyone got a schematic for a Crate TV-6212?
  111. Help and ideas for repairs to Ampeg B2r
  112. Refurbishing a Peavey KB60
  113. Optical pedal repair
  114. RI 65 Twin Reverb with excessive feedback
  115. Strange coupling capacitor problem
  116. peavey tko 115 bass amp circuit
  117. Soldering question
  118. QSC mx2000a
  119. Music Man HD 212
  120. Ashdown MAG600 volume?
  121. VYPYR 30 -No Input audio...
  122. Fender Deluxe Reverb 65, swapped 6v6 and rectifier tube by mistake
  123. When to start repair.
  124. Peavey Special 130 blowing fuses
  125. crate bfx100 blows fuses - possible dc in output
  126. peavey kb100
  127. Help with questions to ask Amp Tech & request list
  128. Help Me Solve This Power Amp Riddle
  129. Throw out bad speakers?
  130. Bassman 10 (70?) PT question
  131. Peavey Renown , howling
  132. SWR SM 400 left channel distorted
  133. volume drop when negative feedback is doisconnected
  134. AVT-50 hum
  135. Morley PFL xformers
  136. New Pot for Fender Blues Deluxe?
  137. Weird DSL +/- 15v supply problem.
  138. Twin Reverb Problems
  139. Boogie Mark I reissue intermittent
  140. AAARRRRGGGHHH! 5150 Question(s)!
  141. 5E3 low feedback/oscillation, stumped???
  142. crackling sound in tube amp
  143. Garnet Mach 5 from 1969
  144. growing bias
  145. Valves for Ashdown FA 60 DSP Head
  146. Problems with a Peavey Classic VTX 65 watt amp.
  147. impedence rule of thumb?
  148. Electrolytics for signal path restoration?
  149. Unplugged speaker protection & line out
  150. dying Mesa nomad 100
  151. Marshall JTM 60 filter cap problem
  152. Marshall VS100 - high pitched squeel
  153. Marshall SL100 Bass Knob Not working
  154. Vox DA15 problem
  155. '76 Princeton Reverb reverb tone/level mod?
  156. Peavey Audition CHORUS request
  157. peavey bandit 112 II
  158. Epiphone Blues Custom Rectifier prob
  159. Ampeg GU-12 tremolo problem
  160. 1978 Marshall
  161. Qsc mx2000a
  162. Ampeg svt classic help
  163. Dual Showman low freq oscillation
  164. Sessionette:75 - Celestion G12-80 dead?
  165. Marshall MG50DFX Blown fuse
  166. Capacitor rated in watts
  167. AMPEG SVT 3 Pro
  168. Need help with my burn Boss-Ch1
  169. AC filiments with one side grounded
  170. no tone no top superlead
  171. Pro-Reverb scratchy vol & bass pots
  172. White Amplification Little Rock
  173. Marshall MG100DFX Unusually Low Volume
  174. Bugera 333 XL 212 gives an extra buzz-sound
  175. Toa D-3 what is Q507?
  176. combo amp speaker question
  177. Power Transformer oddity
  178. my dad wrecked my amp
  179. DeVille no Reverb
  180. diode manufacturers?
  181. Silverface MV Twin Hums On Reverb Channel
  182. Acoustic 470 Repair Issue
  183. Ampeg SVT-3 Pro -- Smoking Toroidal
  184. Goofy Gibson Amp
  185. Guitar Research T60R Zener Diode values
  186. M-80 fade out
  187. Speaker cabinet impedance question
  188. Curious thing on bottom of Ampeg VT-22 cabinet...
  189. Problem with 2003 Marshall JCM 2000 TSL100
  190. Hartke 3500 BJT
  191. AD15 no sound
  192. Marshall 5002 Lead 20 Gut Pic !! - Tech Advice -
  193. Vox Royal Guardsman 1131 problem
  194. blues deluxe reissue problem
  195. AVT-150 repair thread
  196. Older Epiphone amp
  197. Trying to find VOX part
  198. Ampeg BA-115 Crackle/static
  199. MG30dfx headphone jack
  200. 71' Marshall super lead, Replace capacitors?
  201. Peavey Heritage VTX
  202. Problem with my Fender Hot Rod Deluxe
  203. dying amp
  204. Peavey Data Bass
  205. DSL 50 no sound...help
  206. Yamaha EMX660
  207. Help!! Bad Speakers Killed My Amp?
  208. '71 Fender Deluxe reverb Vibrato question
  209. Balanced triodes in PI of Peavey VK's, is it of any use?
  210. Help w Volcano hot EL34 on Music Man 210HD 130
  211. JCM2000 DSL 50 low volume
  212. '71 Fender Deluxe reverb question.
  213. Kitty Hawk preamp repair driving me nuts!!!
  214. Speaker Cab Impedance Question
  215. bug dissected
  216. DSL Hum on Lead Channel
  217. Help: External speaker jack on drri, dead
  218. Gorilla amps: Info on a 10-watter
  219. troubleshooting an Ampeg VH-140C
  220. Deep fried Mc Gretsch! model 7885
  221. Troubleshooting tremolo on a Twin Reverb
  222. Old Fender Blues Deluxe
  223. Got a jvm410 H in and it makes an awful hum on od1 and od2 channels
  224. SFdeluxe with no tremolo
  225. Calculation for heater current
  226. tsl122 pc board
  227. Microphonic tube vs. fillament rattle
  228. Marshall footswitch
  229. GK800RB & Phantom power
  230. Hartke 3500A fault
  231. Ampeg VT-60 bias issue
  232. TSL Clean Channel Buzz
  233. Marshall 1987S Hiss/Hum Problems
  234. "Dorothy, the Evil Twin Is Dead!"
  235. Fender FM 65
  236. Peavey Classic 50 help
  237. Ampeg SVT 4 Pro Board Layout diagram
  238. B-52 At-100 Transformer
  239. Hafler P225 amp has goofy problem
  240. SWR W/M15 Combo hot component
  241. newtronics signal generator
  242. The heater cable toasted
  243. Powered speaker schematic needed
  244. Blues Junior ribbon wiring change
  245. No sound from Marshall MG50dfx
  246. Trouble with my Peavey Classic 30...suggestions?
  247. Sovtek blowing fuses
  248. Marshall Footswitch Conversion Possible?
  249. Marshall MG100hdfx Problem
  250. My VJR Voxy build didn't work, help?