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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Never assume
  2. Bugera 6262 mod.
  3. 80s Fender Concert
  4. Marshall VS102R hum
  5. Fender Twin Amp - need help
  6. Dead Fender Stage 185-replacing thermisto
  7. 69 Laney socket arcing over
  8. australian transformer help
  9. Silverface Combo To Head Conversions
  10. 6V6 tube pin #1 stuck in tube socket...help.
  11. Ampeg BA115 busted?
  12. Stinky Hot Rod Deluxe
  13. Eden Metro 2 ohm load problem
  14. 1973 Fender Twin Reverb - Tinny Sharp sound
  15. Crate Blue Voodoo B60 abnormal signal distortion problem
  16. Fender Twin Amp Tremolo not working
  17. bandmaster rectifier diode type?
  18. Too Much Gain with ax84 amps build
  19. "Manufacturer bypassed" fuses - WTF?
  20. AVT-150 mute circuit
  21. PV 260c driver sub
  22. Randall RG100ESXP sparks and LEDs don't work
  23. Vox V125 Centre Tapped Pots
  24. Suggestions for Boogie Trem-O-Verb Problem?
  25. Possible dumb question alert:: OT Primary/Secondary impedance ?
  26. Crate head gx2200h channel problems
  27. Simulated Tube Rectifier
  28. Marshall Repair Newbie
  29. Silvertone 1474: Sounds like DC on a pot but...
  30. Marshall PROBLEMO!
  31. 1973 bassman 50 problem
  32. JCM900 Volume Fades
  33. Question about capacitor values and voltages....?
  34. Supro/Wards Airline GIM-9131A Tremolo
  35. Champ preamp tube oscillates
  36. Crate Volume Control Problem
  37. Bugera 333xl 212 combo problem
  38. Another Marshall Hum Problem - help!
  39. Heathkit
  40. question Polytone Mini Brute III / IV / M-PA
  41. Peavey TubeFex Pre Amp Error Codes???
  42. Help repairing Ampeg 1540 Crossover
  43. Hum - Marshall Valvestate VS265R
  44. 1975 Fender Twin 2nd channel distorting - Help!
  45. Hum in a Marshall
  46. Ampeg SVT 4 Pro power issue
  47. Crate Blue Voodoo 6212 Low Output
  48. Can Cap replacements for Traynor YGL-3
  49. Marshall AVT-50 volume drop-out
  50. Bugera 333xl-212 Issue AGAIN
  51. Vox Cambridge 30 Reverb Twin keeps blowing TDA2050
  52. Need 5B3 Deluxe OT recommendations
  53. Fender Studio Lead spares
  54. Ceramic cap voltage ratings.
  55. Behringer 880S Left Main Cuts out
  56. My 65 Reissue Princeton has no power.
  57. fender sidekick reverb 30
  58. Marshal VS100 transformer problem? (audio sample included)
  59. Peavey Max 115 - No Output HELP!
  60. peavey encore circa 1984
  61. send back to mesa?
  62. Bugera 333xl-212 Issue
  63. High B+ with Mojo 761 EX
  64. part values
  65. QSC service bulletins
  66. RI Marshall Super Lead 100 with bias issue
  67. Peavey Delta Blues - Cap job and the PCB
  68. Ampeg B-15 Trouble
  69. Shared cathodes but not plates
  70. 5150 problem
  71. Source for SS schematics (Marshall AVT50)
  72. Peavey Bandit 65 - Problem in volume knob
  73. New 7868 vs. NOS or Used?
  74. Bandmaster PT and OT part numbers
  75. finding/replacing filter capacitors....
  76. Peavey VTM 120-- please help
  77. FireFly Tube Amp Oscillation
  78. Electrovoice 81PMX Powered Mixing Board
  79. Blown trace on PCB
  80. Ampeg V4 distorting when increasing volume
  81. Princeton Reverb II switching
  82. 5E3 Deluxe Problems
  83. Valve Junior V3 Head input mod gone wrong...
  84. trouble shoot traynor yrm-1 reverb master
  85. Bugera 333Xl 212 Huge Problem
  86. Warning about amps with switching power supplies
  87. Fender Sidekick Reverb 15 repair - also, schematic?
  88. Just a compliment to you
  89. Ampeg V4 cap job using non-original value multi-caps...
  90. Airline 62-9015A
  91. Got a Bias Meter, now what!? Calling all experts...
  92. Marshall MG100HDFX Volume Drop
  93. Dead Line 6 Spider II HD
  94. Peavey Special 112 problem in effects loop
  95. Polytone Mini Brute
  96. Fender Hot Rod Deluxe: Sound comes and goes intermittently
  97. 36 watt (marshall 18 modified) neg. feedback
  98. Peavey Classic 100 help
  99. Hummmmmmmmm.....
  100. Marshall DSL201 with low volume
  101. Ampeg transformer question.
  102. PV Mark IV 16ch head scratcher
  103. Sovtek Mig-60 trouble
  104. Blues Deluxe part numbers
  105. FX loop issues
  106. Peavey classic 50/50 amp head
  107. Finally got a Compu Bias... need help interpreting data for Fender Princeton
  108. Grid Wires??
  109. Blues Junior Hum Problem
  110. Ampeg Rocket bias problem
  111. 2001 Fender Super Reverb
  112. wanted- low voltage (600vct or less) tremolux PT
  113. Fender Super Farting?
  114. Gibson GA40 RVT Cutting Out
  115. Legion Sound LSP-8 - any info on schemos?
  116. Fender M-80 Chorus
  117. 5e3 runaway
  118. Fender Twin transformer runs hot?
  119. Peavey Impuls disassembly?
  120. power cap polarity
  121. Acoustic 370 oscillation in power stage
  122. Need Help with Marshall Mosfet
  123. 1972? Orange PA120 (Warning BIG PICS)
  124. 7 pin midi
  125. How do I bias a Peavey Windsor Head
  126. JCM 900 with loud channel switching pop.
  127. Peavey 5150 problem
  128. Will badly biased tubes take out an OT?
  129. who has NOS jacks?
  130. Ampeg B2-RE bass amp DC on output
  131. Old Carvin Pro Bass II 300 pops and crackles
  132. Acoustic B100H Schematic?
  133. AB763 Showman Replacement PT Info?
  134. Roland Jazz Chorus-120
  135. Vibrolux 6G11a low voltage. Replaced transformer. please help..
  136. Deluxe Reverb Distortion
  137. Vox AC30 RI head with AC on the B+
  138. Cross referencing-finding parts
  139. Marshall TSL lead channel not working
  140. Furman PL-8 Series II
  141. Hartke 3500 transformer supplier?
  142. Marshall 201 footswitch
  143. BDW83D and BDW84D TO-3P Equivalents ???
  144. speaker polarity
  145. hartke 3500 amp .. problem blowing speakers
  146. Anybody got a pic of the underside of a Fender Bandmaster Power Supply board?
  147. Blues Junior distortion
  148. Carvin Stereo Tube 100 (TS100)
  149. PEAVEY CLASSIC 30 HUM whilst playing
  150. 50 Caliber reverb wire
  151. High-pitch noise in modded Peavey Classic30 (oscillation?)
  152. Orange OR120
  153. fender ultra chorus volume problem
  154. Reverb/Noise issues on Silverface Princeton Reverb
  155. Help With A JCM2000 TSL 122!
  156. Mesa 50 Caliber reverb wire
  157. Marshall 8100 Valvestate Volume issue on Distortion channel
  158. Marshall G80R CD lights up no output
  159. Dsl 100 Preamp hum
  160. Another DSL Marshall problem..
  161. Low Bias Voltage on Crate TV-120
  162. SVT 4 Pro issues
  163. marshall 20/20 el84 problem :-(
  164. SVT-3 PRO fan problem
  165. Ampeg Smokey Burning and Blue Flashes!!!
  166. want to help me help kids? (amp repair)
  167. ampeg reverbrocket 2 voltage chart wanted
  168. What Voltage should my Bias be set at?
  169. Fender Blues Deluxe Reissue completely dead
  170. Peavey Microbass
  171. matched tube question
  172. Maximum voltage on oscilloscope
  173. Vibro-King EL84 Modification?
  174. Fender Princeton Chorus question
  175. ampeg reverbrocket question
  176. Multivox Tape Echo (just like Roland 201) has low output distorted echo
  177. deville 410 loud hum
  178. new guy here, blues deville problem!!
  179. mesa boogie ground switch
  180. Fender Deville 212 - Help!
  181. Bad solder joints????
  182. Acoustic 470 cuts out.
  183. Peavey Mark IV: dc on the speaker and preout jacks
  184. newer tube/SS amps - any techs not wanting to fix them?
  185. Crate cabinet inside wiring
  186. Ampeg B 100R -15dB problem
  187. Peavey KB60 driver transistors
  188. Big trouble with modded Peavey C30
  189. Peavey Vintage
  190. never changed a fuse b4fender princeton 112
  191. I screwed this One up!
  192. Kay model 606 tube amp help needed
  193. JMP - missing resistors
  194. Marshall DSP 201
  195. Peavey VK100 6v heaters
  196. NFB question
  197. Crate VC 5310 gone bad!!! Please help!!
  198. Crate Power Resistor Question
  199. TSL602 Low gain
  200. Marshall MB450H popping on shut down
  201. Harmonic Tube(s) with attenuator
  202. valvastate 8008 blowing secondary fuses
  203. Volume issue
  204. Dean Markley DMC 80 Power Transformer Secondary AC Voltage?
  205. '59 Bassman Clone Presence Control Problem
  206. super reverb intermittant fuse blowing
  207. Kay 730-c upgrade for guitar
  208. TSL100 bias again
  209. Randomly popping fuse
  210. Power Supply Cap's, Options ???
  211. 5E3 hums when connected w/ TTE
  212. ok to pull tubes?
  213. Peavey Bandit 112 transtube 2001 sheffield spkr
  214. 1980 Princeton Reverb Vibrato Always On? HELP!
  215. Friends in the news
  216. Heater voltage too low on Fender Showman
  217. master reverb 30 starting to choke
  218. Mesa F-50 noise on clean channel
  219. Marshall JCM 2000 repair issues
  220. Fender lamps
  221. Deluxe reverb reissue doesn't like loud
  222. Vox AC30TB gain problem
  223. Chassis Clips
  224. Peavey 5150 combo amp fuse?
  225. Marshall JCM: Loud hum goes away when I touch the chassis
  226. Ampeg SVT-6 Pro Random Noises
  227. Behringer BXL 1800A
  228. General capacitor value (swapping) and function question
  229. Gibson G-10 (solid state) Output Stage Problem
  230. Help: Fender Pro Junior Undertones?
  231. Marshall dsl 201 combo
  232. Fender 75 Tube order?
  233. ampeg SVT noise issue
  234. standby switch
  235. Holden Slave mods
  236. Peavey VYPYR 15
  237. Fender Hot Rod Deville: clean channel switching problem
  238. How to get started with an oscilloscope?
  239. Marshall TSL 100 Issue
  240. Ampeg v4 trouble that needs to be shot
  241. crate bl120 crashes
  242. No sound from Vintage Deluxe Reverb
  243. Is a 6G6-A Bassman quiet for it's power?
  244. JCM2000 DSL pcb pots?
  245. crate v33h channel switching pop noise
  246. Ashdown mag 300 combo amp, quit on me.
  247. Ampeg B15S humming
  248. valve brands for fender amps?
  249. power loss in '66 blackface princeton n/r
  250. Tube burning station