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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Bassman AB165 midrange hiss
  2. Shorted Reverb Tank Causes Distortion
  3. regulated AC PSU
  4. Hotrod Deluxe Problem
  5. Wurlitzer 200 Power transistors.
  6. Sunn Model A
  7. Dr. Z kt-45 question
  8. Peavey C30: noise forever ?
  9. TDA7293 replacement in an AVT150
  10. Anyone got a schematic for a Crate TV-6212?
  11. Help and ideas for repairs to Ampeg B2r
  12. Refurbishing a Peavey KB60
  13. Optical pedal repair
  14. RI 65 Twin Reverb with excessive feedback
  15. Strange coupling capacitor problem
  16. peavey tko 115 bass amp circuit
  17. Soldering question
  18. QSC mx2000a
  19. Music Man HD 212
  20. Ashdown MAG600 volume?
  21. VYPYR 30 -No Input audio...
  22. Fender Deluxe Reverb 65, swapped 6v6 and rectifier tube by mistake
  23. When to start repair.
  24. Peavey Special 130 blowing fuses
  25. crate bfx100 blows fuses - possible dc in output
  26. peavey kb100
  27. Help with questions to ask Amp Tech & request list
  28. Help Me Solve This Power Amp Riddle
  29. Throw out bad speakers?
  30. Bassman 10 (70?) PT question
  31. Peavey Renown , howling
  32. SWR SM 400 left channel distorted
  33. volume drop when negative feedback is doisconnected
  34. AVT-50 hum
  35. Morley PFL xformers
  36. New Pot for Fender Blues Deluxe?
  37. Weird DSL +/- 15v supply problem.
  38. Twin Reverb Problems
  39. Boogie Mark I reissue intermittent
  40. AAARRRRGGGHHH! 5150 Question(s)!
  41. 5E3 low feedback/oscillation, stumped???
  42. crackling sound in tube amp
  43. Garnet Mach 5 from 1969
  44. growing bias
  45. Valves for Ashdown FA 60 DSP Head
  46. Problems with a Peavey Classic VTX 65 watt amp.
  47. impedence rule of thumb?
  48. Electrolytics for signal path restoration?
  49. Unplugged speaker protection & line out
  50. dying Mesa nomad 100
  51. Marshall JTM 60 filter cap problem
  52. Marshall VS100 - high pitched squeel
  53. Marshall SL100 Bass Knob Not working
  54. Vox DA15 problem
  55. '76 Princeton Reverb reverb tone/level mod?
  56. Peavey Audition CHORUS request
  57. peavey bandit 112 II
  58. Epiphone Blues Custom Rectifier prob
  59. Ampeg GU-12 tremolo problem
  60. 1978 Marshall
  61. Qsc mx2000a
  62. Ampeg svt classic help
  63. Dual Showman low freq oscillation
  64. Sessionette:75 - Celestion G12-80 dead?
  65. Marshall MG50DFX Blown fuse
  66. Capacitor rated in watts
  67. AMPEG SVT 3 Pro
  68. Need help with my burn Boss-Ch1
  69. AC filiments with one side grounded
  70. no tone no top superlead
  71. Pro-Reverb scratchy vol & bass pots
  72. White Amplification Little Rock
  73. Marshall MG100DFX Unusually Low Volume
  74. Bugera 333 XL 212 gives an extra buzz-sound
  75. Toa D-3 what is Q507?
  76. combo amp speaker question
  77. Power Transformer oddity
  78. my dad wrecked my amp
  79. DeVille no Reverb
  80. diode manufacturers?
  81. Silverface MV Twin Hums On Reverb Channel
  82. Acoustic 470 Repair Issue
  83. Ampeg SVT-3 Pro -- Smoking Toroidal
  84. Goofy Gibson Amp
  85. Guitar Research T60R Zener Diode values
  86. M-80 fade out
  87. Speaker cabinet impedance question
  88. Curious thing on bottom of Ampeg VT-22 cabinet...
  89. Problem with 2003 Marshall JCM 2000 TSL100
  90. Hartke 3500 BJT
  91. AD15 no sound
  92. Marshall 5002 Lead 20 Gut Pic !! - Tech Advice -
  93. Vox Royal Guardsman 1131 problem
  94. blues deluxe reissue problem
  95. AVT-150 repair thread
  96. Older Epiphone amp
  97. Trying to find VOX part
  98. Ampeg BA-115 Crackle/static
  99. MG30dfx headphone jack
  100. 71' Marshall super lead, Replace capacitors?
  101. Peavey Heritage VTX
  102. Problem with my Fender Hot Rod Deluxe
  103. dying amp
  104. Peavey Data Bass
  105. DSL 50 no sound...help
  106. Yamaha EMX660
  107. Help!! Bad Speakers Killed My Amp?
  108. '71 Fender Deluxe reverb Vibrato question
  109. Balanced triodes in PI of Peavey VK's, is it of any use?
  110. Help w Volcano hot EL34 on Music Man 210HD 130
  111. JCM2000 DSL 50 low volume
  112. '71 Fender Deluxe reverb question.
  113. Kitty Hawk preamp repair driving me nuts!!!
  114. Speaker Cab Impedance Question
  115. bug dissected
  116. DSL Hum on Lead Channel
  117. Help: External speaker jack on drri, dead
  118. Gorilla amps: Info on a 10-watter
  119. troubleshooting an Ampeg VH-140C
  120. Deep fried Mc Gretsch! model 7885
  121. Troubleshooting tremolo on a Twin Reverb
  122. Old Fender Blues Deluxe
  123. Got a jvm410 H in and it makes an awful hum on od1 and od2 channels
  124. SFdeluxe with no tremolo
  125. Calculation for heater current
  126. tsl122 pc board
  127. Microphonic tube vs. fillament rattle
  128. Marshall footswitch
  129. GK800RB & Phantom power
  130. Hartke 3500A fault
  131. Ampeg VT-60 bias issue
  132. TSL Clean Channel Buzz
  133. Marshall 1987S Hiss/Hum Problems
  134. "Dorothy, the Evil Twin Is Dead!"
  135. Fender FM 65
  136. Peavey Classic 50 help
  137. Ampeg SVT 4 Pro Board Layout diagram
  138. B-52 At-100 Transformer
  139. Hafler P225 amp has goofy problem
  140. SWR W/M15 Combo hot component
  141. newtronics signal generator
  142. The heater cable toasted
  143. Powered speaker schematic needed
  144. Blues Junior ribbon wiring change
  145. No sound from Marshall MG50dfx
  146. Trouble with my Peavey Classic 30...suggestions?
  147. Sovtek blowing fuses
  148. Marshall Footswitch Conversion Possible?
  149. Marshall MG100hdfx Problem
  150. My VJR Voxy build didn't work, help?
  151. Stupid mistake on my Ampeg B-25
  152. BF Princton Reverb PT Question
  153. Mesa boogie mk iv gone silent!!
  154. crackling sound on my SF super reverb
  155. Silvertone OT
  156. Marshall problem
  157. Fender Acoustasonic Junior - What is wrong with my spring reverb?
  158. Dynacord Eminent I
  159. Another B-25 Question
  160. Benchtop smoke absorber?
  161. Good place to buy parts?
  162. Tektronix 475 Oscilloscope
  163. MARSHALL AVT 150H sometimes works
  164. Grundig tone circuit
  165. 7027A's
  166. Hartke 3500 MOSFET output transistor
  167. Fender FM 212r low level hum
  168. new motherboard for dsl still not working
  169. Tubes warm but not hot?
  170. Mesa M-Pulse 600 BIAS
  171. Ampeg B-25
  172. SWR Workingman's 15 - weird crackle
  173. Ampeg SVT 3 PRO crackling and popping
  174. SOLDANO designed amp/Yamaha
  175. Fender Deville with slight oscillation/flange sound
  176. fender concert 81, clean gets dirty after on awhile
  177. Yamaha T100C
  178. crate rfx120 hum
  179. Bugera 22V?
  180. Power transformer voltage question
  181. Heater wire miswiring fast diagnosis
  182. JCM 800 2203 weird problem
  183. Fender Stage Lead II 2-12
  184. Fender convenience outlets miswired
  185. Peavey Classic 50/50 - Eating Valves (very bright red!)
  186. Kustom Kasino head preamp board
  187. Marshall MG100HDFX. super help needed.
  188. Marshall Tsl 100h Problem
  189. Isolation transformer / amp potiential
  190. Fender Stage 100 DSp Intermittent Output
  191. Peavey Special 130 hum
  192. Reverb Noise
  193. Stiletto channel switching pop
  194. Blues Deluxe weird hum
  195. silicone glue and sound
  196. new speaker whistle
  197. fender twin pro tube
  198. Speaker Reconing Kit
  199. Marshall AVT 100
  200. Dano/Silvertone mystery
  201. Replace Death Cap with Safety Cap?
  202. Bassman AB165 huge hum
  203. "Pop" when switching NFB
  204. JCM 2000 TSL 602 What to replace first????
  205. Chassis Corrosion
  206. Mesa Lonestar hum(generally about hum)
  207. TRex 18watt, gating/farting/blocking?
  208. Behringer pmp3000 will not sound through both mains
  209. SWR Workingman's - distorted
  210. Mesa 2:90 Pop when going to standby
  211. 1963 Reverberocket distortion
  212. Peavey TKO 80 Schematic
  213. Amp turn-off squeak
  214. Distortion/farting in fender frontman 25r
  215. jcm 900 no sound blown OPV fuses
  216. DSL 50 Tube Board rework
  217. Sunn Beta Lead Guitar Head major issues...
  218. Peavey KB100 KB 100 Distorted Output
  219. Peavey Power Board
  220. No Cathode Current / No Sound
  221. Champ 600 debug help
  222. Hotrod Deville preamp problems...
  223. Ampeg vt40 El34 conversion output/headroom
  224. Marmac XL120 Head Repair
  225. Triple XXX head pops, cracks, and hums. HELP
  226. toroid primary gone!
  227. bypass cap values
  228. My Hot Rod Deville (4x10) has picky reverb...
  229. Fender Repair guys
  230. Marshall 2204 - new pots - doesn't work now
  231. Fender Super Six Baby... w/problems :(
  232. Adjusting bias on BDRI (missing TP?)
  233. Hod Rod Deluxe Problems - Please Help
  234. deluxe reverb - can't get plate voltage down
  235. Missing gain in Princeton Reverb
  236. Please help me identify fuses by their ID and look
  237. Roland Cub 60 pwr xfmr replacement
  238. jvm410h volume control on od1 and od2 issues
  239. single ended tube amp help
  240. Replacing caps in Magnatone
  241. polytone brute bass amp back again....
  242. Line 6 AX2 Power Transformer Hookup
  243. Pp el 34 ht waaay too high!
  244. repair question: Tremolo Silvertone 1484
  245. Fender Twin Amp tremolo lives again
  246. Cooked power tranny? (Vibrolux Reverb)
  247. 36 coupe filament problem
  248. Crate GX-120 problem
  249. Marshall JCM-800 "clipping diodes"
  250. Making a footswitch for MG15MS15ZW