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View Full Version : Maintenance, Troubleshooting & Repair



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  1. vox valvetronics self test mode
  2. peavey 5150 / marshll 1987x
  3. Mesa Boogie Mark 3 Gain Loss
  4. speaker wiring question
  5. Danelectro Cadet 122 problems
  6. Ampeg SB12 Hum
  7. randall bass amp distorts
  8. Showman tremolo on without footswitch
  9. Frontman 25R Channel Switching/Footswitch Problem.
  10. Fender M-80
  11. 86 Carvin X100 trouble.No Volume,cooked resistor
  12. parasitic?
  13. VS65R - No Output, Preamp works
  14. Need help with Fender Schematic
  15. Marshall Valve Problem
  16. Arcing in power tubes
  17. Fender HD Deluxe -Update on using different dropping resistors
  18. Marshall DSL 401 No Sound! Really Need some help!!
  19. marshall that whistle
  20. Randall distorts
  21. Marshall tubes marked vlve000..etc
  22. Help: Diagnosing Non-Functional Reverb
  23. Mystery Caps in my amp??? need help
  24. Fender Champion 600 Switch
  25. Sunn Beta Lead blown?
  26. Ampeg VT60 schematic needed
  27. RE-301 noise on reverb
  28. 22/33uf Filter Caps
  29. Ultra 112 Ch. Switching Nightmare.....
  30. Advice for learning
  31. Biasing Ampeg amp Teach me!
  32. Behringer GMX110 - 20vDC at Speaker Output
  33. Peavey Transformer 112; loud hum
  34. Jcm 2000 marshall Dls 100
  35. Need Help/Advise
  36. Mesa MkIIB - Relay Buzzing
  37. Could it be this simple? (Fender Dual Pro)
  38. 4 Tube amp Questions for noob
  39. Noisy Elmwood - could it be damaged?
  40. Triple Rectifier - hissing
  41. QUESTION: How to Diagnose a defective speaker?
  42. Help with marshall jtm-30 & 60
  43. 68 'twin Vibrato
  44. AC30 needs retubing
  45. Old Princeton Reverb keeps blowing fuses
  46. Morley EVO-1 oilcan echo
  47. SVT fan coming through speakers
  48. MG100HDFX - Help required please.....
  49. Amp crackle with note - I'm stumped!
  50. Unspecific Peavey 5150 question...
  51. Black face Dual Showman ??s
  52. Fender Hotrod Deluxe poweramp distorting
  53. Vox AD60VT loses memory when using foot controller
  54. Amps blowing fuses. Please help.
  55. power tubes flashing along with trem, help!
  56. Yamaha G50-112 Schematic Needed
  57. peavey clone again
  58. Fender Ultimate Chrous
  59. Roland Cube60 problem
  60. Peavey Classic 30 1x12 gone dead
  61. Blues Deluxe Reissue low volume
  62. magantone 431 chirping when vibrato is on
  63. Kendrick Gusher
  64. DRRI question????
  65. transformer wiring
  66. Vox AC-15 Problem
  67. SVT-2 Pro problems
  68. No output from 5150II
  69. Installing 3 prong cord in GA5
  70. Cornford Hurricane Reverb issue
  71. Need Output Modules for MF350
  72. Low Power w/ SF Bassman
  73. Help!!! Marshall DSL 401 Issue!!!
  74. fender princeton 650 making popping noises
  75. Dsl 401
  76. Rusted SVT transformers
  77. Fender reverb send/return as effects loop?
  78. Music Man 2275-65 break-up
  79. Acoustic 150b unwanted disortion
  80. Behringer BX1200 low Output
  81. Silvertone 1482
  82. Russian 6V6's arcing internally
  83. peavey classic 50 won't turn on, burnt cap.. help!
  84. Treble Control popping noise
  85. scratchy presence pot
  86. Rivera R55 cap popped
  87. Amp cuts out at loud volume
  88. Marshall hdfx schems?
  89. SJ 83100 transistor data sheet
  90. Can I bias my 6505+ / 5150-II?
  91. Question about tube pins and schematics
  92. Question about discharging capacitors
  93. Gallien Krueger fan not working
  94. Pignose B100V
  95. Music Man Capacitors
  96. Very Unstable Amp - Oscillation
  97. Should these resistors be replaced? Pic
  98. Verlage VTR-100 Schematic Needed
  99. JMP1 preamp battery replacement - solder or glue it in?
  100. Questions about cap job I had done
  101. SF Twin Reverb - fuse blowing
  102. vox valvetronics head
  103. Marshall TSL 122: Almost no volume
  104. My amp won't come off standby... please help.
  105. Invader 60 1970's Head
  106. Fender Rumble 100 Extension Speaker
  107. Oh my god!!!!!!!
  108. Mesa Simul 2:90
  109. Peavey XR400 fried 200H module
  110. jcm900
  111. Looking for vox info
  112. Trace Elliot V-type preamp noisy ground
  113. Peavey TNT100 - DC298 dead transformer
  114. line out for peavey tnt 100
  115. JCM900 chips?
  116. Peavey classic duel 212 scratchy popping noise
  117. Recapping Gibson G-10 questions
  118. Marshall caps....what type?
  119. Trying to repair the tremolo in a Silvertone 1472
  120. Pa 100, updates and prob with reverb
  121. Carvin PB150 biasing
  122. Marshall Valvestate 8008 pots, log or lin?
  123. No reverb in Hot Rod Deluxe
  124. Fender 65 Deluxe Reverb RI shutting down...
  125. ampeg v4 buzzing output with just power switch on
  126. Fender Ultra Chorus, Noisey Left Channel.
  127. Amplifier cut outs
  128. Heyboer color codes
  129. Marshall AVT50H
  130. Slide on Connectors for Valve JR
  131. Acoustic 370 grounding issue, ch2 buzz
  132. Dead Harmony h303a
  133. Help on Marshall AVT150H gone bad..please
  134. G-dec
  135. Sound Fluctuation with Single Rectifier! HELP
  136. Sound Fluctuation with Single Rectifier! HELP
  137. Marshall mg250dfx...HELP
  138. Need work from an amp tech...
  139. Yamaha P7000S
  140. Burning Fuses
  141. Marshall squeals like a pig
  142. Acoustic 320, low output (again!)
  143. tiny terror clone -> just humm, sound
  144. Pignose G40v- maintenance?
  145. HA3500a with a very hot Heatsink
  146. old Laney 610v B+ what tubes?
  147. Noob, did I hurt my new amp?
  148. Hot Rod Deville - speaker mounting screws
  149. Fender Pro 185 need resistor
  150. What the heck is B+, and that A on AA764 Champ Schematic?
  151. Marshall JCM2000 DSL 100 biasing?
  152. What output transformer for Mesa Boogie Studio .22 +
  153. Tubes too hot for OT?
  154. Hartke 7000 output bad with load
  155. fender princeton amp. ?????????
  156. Hartke 3500 no output...photo enclosed
  157. Where's the reverb
  158. Power Caps bleed how fast? Does that indicate condition?
  159. Fender Deluxe Reverb re-issue
  160. Sovtek Mig 50
  161. wanted : transfo for Ampeg B2R
  162. "Thumping" tremolo circuit
  163. Roland Jazz Chorus repair NYC
  164. 5y3 GT in 6G2 Princeton
  165. SF 1969 Champ, what is causing "chirping" ?
  166. Marshall Vintage Modern 2466 Schematic?
  167. Please please help svt classic problem
  168. Roland Jazz Chorus
  169. Very old pignose 7-100
  170. Peavey Delta Blues
  171. Marshall JCM2000 TSL feedback on clean channel
  172. Traynor 7027 sub?
  173. Fender 30 - channel switch pops
  174. Ampeg V4-b, bad 6k11 stage...
  175. Tubeworks schem?
  176. VOM MOdel 700
  177. Yamaha Bass Combo YBA-100
  178. supro loss of volume
  179. Removing the chassis...
  180. Vox Berkeley ll Low output
  181. Biasing amps with PCB mounted power tube sockets....
  182. Marshall JMP1 with flaky power button
  183. What kind of speakers are these?
  184. fender princeton chorus amp
  185. boxy sounding cabinet
  186. Hot Rod Deluxe problem
  187. Pro Reverb Volume drop off, desperately need help
  188. Can any help a brutha out with a vox ad 120 vtx speaker issue?
  189. Marshall G100R Schematic?
  190. 70's Deluxe Reverb reverb squeal
  191. Vox 1143 question
  192. Deville Hot Rod 212 fizzled out
  193. Ampeg Svt-200t schematic
  194. Vibroverb PT - no centre tap on heater circuit
  195. Gibson GA42 subtle overdrive problem
  196. Power Transformer - Crackle and Hot!
  197. 6505+ just quit
  198. Voice of Music Model 700 (1955)
  199. Ampeg SVT-4 PRO repair amp output
  200. Carvin Series III X-Amp
  201. How can I test a ouput trans to see if its faulty
  202. Amp squeals at hi gain
  203. New member, new '77 Princeton Reverb
  204. Vox AC 30 HH China RI schematic
  205. 13ohm speaker load: 16 or 8ohm tap?
  206. Zero Ohms on reverb tank input?
  207. Sovtek mig 50 - Transformer change.
  208. White noise...
  209. Hohner Harp Mic - pots
  210. Trac Elliot Speed Twin Output Tranny Specs and Replacement ?
  211. Tape on reverb tank coils - why?
  212. Gibson Explorer
  213. Proper orientation of coupling caps
  214. Preamp Woes 8080 H(Valvestate 80V)
  215. Troubleshooting hiss
  216. Marshall DSL JCM2000
  217. Finding Gassy Tubes.
  218. Marshall 8040 - How do I get at the pots?
  219. Twin Reverb II data and schematic
  220. "Phaser kind sweep" with Master Volume???
  221. Univox 2x12 tall tube amp-japanese
  222. Mace reverb hum
  223. Jcm900 Issue
  224. Deluxe Reverb Rebuild need expert help
  225. marshall tsl 602 - dull sound
  226. Peavey rockmaster help
  227. Hiwatt dr504 bias problem
  228. potentiometer question...
  229. Fender Amp Power On/Off Light Problem
  230. Gretsch playboy amp vibrato problem
  231. Marshall MG100HDFX repair?
  232. my mg100dfx problem
  233. Testing OT's
  234. Engl Fireball Trouble
  235. Fender PCB pots
  236. Solder/Desolder Station
  237. Marshall JCM 2000 reverb query
  238. Power tranny gets HOT in old Guild amp
  239. Ampeg SS-70CA schematics?
  240. Bias Circuit Problem
  241. Peavey Valveking switching help!
  242. Crate VC120H schematic needed.
  243. New Guy, 5150 question.
  244. JTM45 build - channel volume problem
  245. Hartke 3500 MOSFET Output Transistors
  246. power tran buzzing
  247. Peavey Classic 30, no sound until turned off.
  248. 1950's Ampeg Amplifier
  249. DSL Hum, C46 question
  250. Rivera Clubster 45 hissy