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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Madison Divinity II Head volume problems
  2. Gallien Krueger 700RB II - Bad Ground
  3. JCM 900-4100 preamp question
  4. Test equipment......
  5. Peavey Mace doesn't power up anymore
  6. Marshall AVT275 - No Sound From Main Speakers
  7. marshall vs 100 need help
  8. PIN Chart/Diagram
  9. 12dw7/ecc832
  10. Peavey TNT 100 Problem/ Questions
  11. Hot Rod Deville 212
  12. Fender Sidekick 35- transformer substitution
  13. Keyboard - Internal Zip drive
  14. 1966 Bandmaster and 60Hz hum....?
  15. Fender performer 1000 ( PR 209)
  16. Peavey XR 680c Volume cuts&Jumps
  17. HR Deville problem....?
  18. Late 90's Peavey Transtube Supreme repair (power transistor questions)...
  19. Stage 160 pre amp into FM 212 power amp question
  20. Fender Blues DeVille Faceplate?
  21. Thanks For The Help!
  22. MPSU95 sub?
  23. Transformer testing?
  24. New 5150 owner, need some help
  25. Peavey Duel 212 problem
  26. AC30SS hi-res schematics
  27. Crate RFX 65 RetroFex Hum
  28. Peavey 400 B/G Mark III Bass Amp Problem
  29. Acoustic 270 repair
  30. 7189 questions
  31. Peavey encore 65
  32. Need ampage v-4 filter caps
  33. Bassman 100 tubes drawing low current
  34. Silvertone 1484 Twin Twelve Tremolo Not Working
  35. Wire colors JMP 50 OT?
  36. 12v transformer for relays
  37. silvertone 1484 reverb(?)
  38. peavey PV-4C trips reset Switch
  39. Motorboating and NFB
  40. Fender Bassman 6G6A Intermittent HT
  41. EVH 5150 iii Schematics
  42. AMPEG Echo Twin ET-2 Question
  43. Low voltage Orange
  44. Marshall Mode Four MF350 Problems
  45. behringer gm 108
  46. Weird voltages in T50
  47. simple, but i need HELP AMPEG 115 amp
  48. 69 Marshall Super Lead blowing fuses
  49. 96 Fender Twin (PR266) Reverb Static Problem
  50. Getting a Hickok tube tester going again.
  51. Extra tap on primary side of power transformer. What is it?
  52. EVH 5150 III (5153) clipping with Wah
  53. Behringer BX600 optocoupler?
  54. WAY high plate voltage in Fender clone
  55. BZZZZZZZT!!!! Suprise!
  56. Early Marshall 1987/Tremolo Standby Snubber Caps....?
  57. Silvertone 1482
  58. Never assume
  59. Bugera 6262 mod.
  60. 80s Fender Concert
  61. Marshall VS102R hum
  62. Fender Twin Amp - need help
  63. Dead Fender Stage 185-replacing thermisto
  64. 69 Laney socket arcing over
  65. australian transformer help
  66. Silverface Combo To Head Conversions
  67. 6V6 tube pin #1 stuck in tube socket...help.
  68. Ampeg BA115 busted?
  69. Stinky Hot Rod Deluxe
  70. Eden Metro 2 ohm load problem
  71. 1973 Fender Twin Reverb - Tinny Sharp sound
  72. Crate Blue Voodoo B60 abnormal signal distortion problem
  73. Fender Twin Amp Tremolo not working
  74. bandmaster rectifier diode type?
  75. Too Much Gain with ax84 amps build
  76. "Manufacturer bypassed" fuses - WTF?
  77. AVT-150 mute circuit
  78. PV 260c driver sub
  79. Randall RG100ESXP sparks and LEDs don't work
  80. Vox V125 Centre Tapped Pots
  81. Suggestions for Boogie Trem-O-Verb Problem?
  82. Possible dumb question alert:: OT Primary/Secondary impedance ?
  83. Crate head gx2200h channel problems
  84. Simulated Tube Rectifier
  85. Marshall Repair Newbie
  86. Silvertone 1474: Sounds like DC on a pot but...
  87. Marshall PROBLEMO!
  88. 1973 bassman 50 problem
  89. JCM900 Volume Fades
  90. Question about capacitor values and voltages....?
  91. Supro/Wards Airline GIM-9131A Tremolo
  92. Champ preamp tube oscillates
  93. Crate Volume Control Problem
  94. Bugera 333xl 212 combo problem
  95. Another Marshall Hum Problem - help!
  96. Heathkit
  97. question Polytone Mini Brute III / IV / M-PA
  98. Peavey TubeFex Pre Amp Error Codes???
  99. Help repairing Ampeg 1540 Crossover
  100. Hum - Marshall Valvestate VS265R
  101. 1975 Fender Twin 2nd channel distorting - Help!
  102. Hum in a Marshall
  103. Ampeg SVT 4 Pro power issue
  104. Crate Blue Voodoo 6212 Low Output
  105. Can Cap replacements for Traynor YGL-3
  106. Marshall AVT-50 volume drop-out
  107. Bugera 333xl-212 Issue AGAIN
  108. Vox Cambridge 30 Reverb Twin keeps blowing TDA2050
  109. Need 5B3 Deluxe OT recommendations
  110. Fender Studio Lead spares
  111. Ceramic cap voltage ratings.
  112. Behringer 880S Left Main Cuts out
  113. My 65 Reissue Princeton has no power.
  114. fender sidekick reverb 30
  115. Marshal VS100 transformer problem? (audio sample included)
  116. Peavey Max 115 - No Output HELP!
  117. peavey encore circa 1984
  118. send back to mesa?
  119. Bugera 333xl-212 Issue
  120. High B+ with Mojo 761 EX
  121. part values
  122. QSC service bulletins
  123. RI Marshall Super Lead 100 with bias issue
  124. Peavey Delta Blues - Cap job and the PCB
  125. Ampeg B-15 Trouble
  126. Shared cathodes but not plates
  127. 5150 problem
  128. Source for SS schematics (Marshall AVT50)
  129. Peavey Bandit 65 - Problem in volume knob
  130. New 7868 vs. NOS or Used?
  131. Bandmaster PT and OT part numbers
  132. finding/replacing filter capacitors....
  133. Peavey VTM 120-- please help
  134. FireFly Tube Amp Oscillation
  135. Electrovoice 81PMX Powered Mixing Board
  136. Blown trace on PCB
  137. Ampeg V4 distorting when increasing volume
  138. Princeton Reverb II switching
  139. 5E3 Deluxe Problems
  140. Valve Junior V3 Head input mod gone wrong...
  141. trouble shoot traynor yrm-1 reverb master
  142. Bugera 333Xl 212 Huge Problem
  143. Warning about amps with switching power supplies
  144. Fender Sidekick Reverb 15 repair - also, schematic?
  145. Just a compliment to you
  146. Ampeg V4 cap job using non-original value multi-caps...
  147. Airline 62-9015A
  148. Got a Bias Meter, now what!? Calling all experts...
  149. Marshall MG100HDFX Volume Drop
  150. Dead Line 6 Spider II HD
  151. Peavey Special 112 problem in effects loop
  152. Polytone Mini Brute
  153. Fender Hot Rod Deluxe: Sound comes and goes intermittently
  154. 36 watt (marshall 18 modified) neg. feedback
  155. Peavey Classic 100 help
  156. Hummmmmmmmm.....
  157. Marshall DSL201 with low volume
  158. Ampeg transformer question.
  159. PV Mark IV 16ch head scratcher
  160. Sovtek Mig-60 trouble
  161. Blues Deluxe part numbers
  162. FX loop issues
  163. Peavey classic 50/50 amp head
  164. Finally got a Compu Bias... need help interpreting data for Fender Princeton
  165. Grid Wires??
  166. Blues Junior Hum Problem
  167. Ampeg Rocket bias problem
  168. 2001 Fender Super Reverb
  169. wanted- low voltage (600vct or less) tremolux PT
  170. Fender Super Farting?
  171. Gibson GA40 RVT Cutting Out
  172. Legion Sound LSP-8 - any info on schemos?
  173. Fender M-80 Chorus
  174. 5e3 runaway
  175. Fender Twin transformer runs hot?
  176. Peavey Impuls disassembly?
  177. power cap polarity
  178. Acoustic 370 oscillation in power stage
  179. Need Help with Marshall Mosfet
  180. 1972? Orange PA120 (Warning BIG PICS)
  181. 7 pin midi
  182. How do I bias a Peavey Windsor Head
  183. JCM 900 with loud channel switching pop.
  184. Peavey 5150 problem
  185. Will badly biased tubes take out an OT?
  186. who has NOS jacks?
  187. Ampeg B2-RE bass amp DC on output
  188. Old Carvin Pro Bass II 300 pops and crackles
  189. Acoustic B100H Schematic?
  190. AB763 Showman Replacement PT Info?
  191. Roland Jazz Chorus-120
  192. Vibrolux 6G11a low voltage. Replaced transformer. please help..
  193. Deluxe Reverb Distortion
  194. Vox AC30 RI head with AC on the B+
  195. Cross referencing-finding parts
  196. Marshall TSL lead channel not working
  197. Furman PL-8 Series II
  198. Hartke 3500 transformer supplier?
  199. Marshall 201 footswitch
  200. BDW83D and BDW84D TO-3P Equivalents ???
  201. speaker polarity
  202. hartke 3500 amp .. problem blowing speakers
  203. Anybody got a pic of the underside of a Fender Bandmaster Power Supply board?
  204. Blues Junior distortion
  205. Carvin Stereo Tube 100 (TS100)
  206. PEAVEY CLASSIC 30 HUM whilst playing
  207. 50 Caliber reverb wire
  208. High-pitch noise in modded Peavey Classic30 (oscillation?)
  209. Orange OR120
  210. fender ultra chorus volume problem
  211. Reverb/Noise issues on Silverface Princeton Reverb
  212. Help With A JCM2000 TSL 122!
  213. Mesa 50 Caliber reverb wire
  214. Marshall 8100 Valvestate Volume issue on Distortion channel
  215. Marshall G80R CD lights up no output
  216. Dsl 100 Preamp hum
  217. Another DSL Marshall problem..
  218. Low Bias Voltage on Crate TV-120
  219. SVT 4 Pro issues
  220. marshall 20/20 el84 problem :-(
  221. SVT-3 PRO fan problem
  222. Ampeg Smokey Burning and Blue Flashes!!!
  223. want to help me help kids? (amp repair)
  224. ampeg reverbrocket 2 voltage chart wanted
  225. What Voltage should my Bias be set at?
  226. Fender Blues Deluxe Reissue completely dead
  227. Peavey Microbass
  228. matched tube question
  229. Maximum voltage on oscilloscope
  230. Vibro-King EL84 Modification?
  231. Fender Princeton Chorus question
  232. ampeg reverbrocket question
  233. Multivox Tape Echo (just like Roland 201) has low output distorted echo
  234. deville 410 loud hum
  235. new guy here, blues deville problem!!
  236. mesa boogie ground switch
  237. Fender Deville 212 - Help!
  238. Bad solder joints????
  239. Acoustic 470 cuts out.
  240. Peavey Mark IV: dc on the speaker and preout jacks
  241. newer tube/SS amps - any techs not wanting to fix them?
  242. Crate cabinet inside wiring
  243. Ampeg B 100R -15dB problem
  244. Peavey KB60 driver transistors
  245. Big trouble with modded Peavey C30
  246. Peavey Vintage
  247. never changed a fuse b4fender princeton 112
  248. I screwed this One up!
  249. Kay model 606 tube amp help needed
  250. JMP - missing resistors