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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Installing 3 prong cord in GA5
  2. Cornford Hurricane Reverb issue
  3. Need Output Modules for MF350
  4. Low Power w/ SF Bassman
  5. Help!!! Marshall DSL 401 Issue!!!
  6. fender princeton 650 making popping noises
  7. Dsl 401
  8. Rusted SVT transformers
  9. Fender reverb send/return as effects loop?
  10. Music Man 2275-65 break-up
  11. Acoustic 150b unwanted disortion
  12. Behringer BX1200 low Output
  13. Silvertone 1482
  14. Russian 6V6's arcing internally
  15. peavey classic 50 won't turn on, burnt cap.. help!
  16. Treble Control popping noise
  17. scratchy presence pot
  18. Rivera R55 cap popped
  19. Amp cuts out at loud volume
  20. Marshall hdfx schems?
  21. SJ 83100 transistor data sheet
  22. Can I bias my 6505+ / 5150-II?
  23. Question about tube pins and schematics
  24. Question about discharging capacitors
  25. Gallien Krueger fan not working
  26. Pignose B100V
  27. Music Man Capacitors
  28. Very Unstable Amp - Oscillation
  29. Should these resistors be replaced? Pic
  30. Verlage VTR-100 Schematic Needed
  31. JMP1 preamp battery replacement - solder or glue it in?
  32. Questions about cap job I had done
  33. SF Twin Reverb - fuse blowing
  34. vox valvetronics head
  35. Marshall TSL 122: Almost no volume
  36. My amp won't come off standby... please help.
  37. Invader 60 1970's Head
  38. Fender Rumble 100 Extension Speaker
  39. Oh my god!!!!!!!
  40. Mesa Simul 2:90
  41. Peavey XR400 fried 200H module
  42. jcm900
  43. Looking for vox info
  44. Trace Elliot V-type preamp noisy ground
  45. Peavey TNT100 - DC298 dead transformer
  46. line out for peavey tnt 100
  47. JCM900 chips?
  48. Peavey classic duel 212 scratchy popping noise
  49. Recapping Gibson G-10 questions
  50. Marshall caps....what type?
  51. Trying to repair the tremolo in a Silvertone 1472
  52. Pa 100, updates and prob with reverb
  53. Carvin PB150 biasing
  54. Marshall Valvestate 8008 pots, log or lin?
  55. No reverb in Hot Rod Deluxe
  56. Fender 65 Deluxe Reverb RI shutting down...
  57. ampeg v4 buzzing output with just power switch on
  58. Fender Ultra Chorus, Noisey Left Channel.
  59. Amplifier cut outs
  60. Heyboer color codes
  61. Marshall AVT50H
  62. Slide on Connectors for Valve JR
  63. Acoustic 370 grounding issue, ch2 buzz
  64. Dead Harmony h303a
  65. Help on Marshall AVT150H gone bad..please
  66. G-dec
  67. Sound Fluctuation with Single Rectifier! HELP
  68. Sound Fluctuation with Single Rectifier! HELP
  69. Marshall mg250dfx...HELP
  70. Need work from an amp tech...
  71. Yamaha P7000S
  72. Burning Fuses
  73. Marshall squeals like a pig
  74. Acoustic 320, low output (again!)
  75. tiny terror clone -> just humm, sound
  76. Pignose G40v- maintenance?
  77. HA3500a with a very hot Heatsink
  78. old Laney 610v B+ what tubes?
  79. Noob, did I hurt my new amp?
  80. Hot Rod Deville - speaker mounting screws
  81. Fender Pro 185 need resistor
  82. What the heck is B+, and that A on AA764 Champ Schematic?
  83. Marshall JCM2000 DSL 100 biasing?
  84. What output transformer for Mesa Boogie Studio .22 +
  85. Tubes too hot for OT?
  86. Hartke 7000 output bad with load
  87. fender princeton amp. ?????????
  88. Hartke 3500 no output...photo enclosed
  89. Where's the reverb
  90. Power Caps bleed how fast? Does that indicate condition?
  91. Fender Deluxe Reverb re-issue
  92. Sovtek Mig 50
  93. wanted : transfo for Ampeg B2R
  94. "Thumping" tremolo circuit
  95. Roland Jazz Chorus repair NYC
  96. 5y3 GT in 6G2 Princeton
  97. SF 1969 Champ, what is causing "chirping" ?
  98. Marshall Vintage Modern 2466 Schematic?
  99. Please please help svt classic problem
  100. Roland Jazz Chorus
  101. Very old pignose 7-100
  102. Peavey Delta Blues
  103. Marshall JCM2000 TSL feedback on clean channel
  104. Traynor 7027 sub?
  105. Fender 30 - channel switch pops
  106. Ampeg V4-b, bad 6k11 stage...
  107. Tubeworks schem?
  108. VOM MOdel 700
  109. Yamaha Bass Combo YBA-100
  110. supro loss of volume
  111. Removing the chassis...
  112. Vox Berkeley ll Low output
  113. Biasing amps with PCB mounted power tube sockets....
  114. Marshall JMP1 with flaky power button
  115. What kind of speakers are these?
  116. fender princeton chorus amp
  117. boxy sounding cabinet
  118. Hot Rod Deluxe problem
  119. Pro Reverb Volume drop off, desperately need help
  120. Can any help a brutha out with a vox ad 120 vtx speaker issue?
  121. Marshall G100R Schematic?
  122. 70's Deluxe Reverb reverb squeal
  123. Vox 1143 question
  124. Deville Hot Rod 212 fizzled out
  125. Ampeg Svt-200t schematic
  126. Vibroverb PT - no centre tap on heater circuit
  127. Gibson GA42 subtle overdrive problem
  128. Power Transformer - Crackle and Hot!
  129. 6505+ just quit
  130. Voice of Music Model 700 (1955)
  131. Ampeg SVT-4 PRO repair amp output
  132. Carvin Series III X-Amp
  133. How can I test a ouput trans to see if its faulty
  134. Amp squeals at hi gain
  135. New member, new '77 Princeton Reverb
  136. Vox AC 30 HH China RI schematic
  137. 13ohm speaker load: 16 or 8ohm tap?
  138. Zero Ohms on reverb tank input?
  139. Sovtek mig 50 - Transformer change.
  140. White noise...
  141. Hohner Harp Mic - pots
  142. Trac Elliot Speed Twin Output Tranny Specs and Replacement ?
  143. Tape on reverb tank coils - why?
  144. Gibson Explorer
  145. Proper orientation of coupling caps
  146. Preamp Woes 8080 H(Valvestate 80V)
  147. Troubleshooting hiss
  148. Marshall DSL JCM2000
  149. Finding Gassy Tubes.
  150. Marshall 8040 - How do I get at the pots?
  151. Twin Reverb II data and schematic
  152. "Phaser kind sweep" with Master Volume???
  153. Univox 2x12 tall tube amp-japanese
  154. Mace reverb hum
  155. Jcm900 Issue
  156. Deluxe Reverb Rebuild need expert help
  157. marshall tsl 602 - dull sound
  158. Peavey rockmaster help
  159. Hiwatt dr504 bias problem
  160. potentiometer question...
  161. Fender Amp Power On/Off Light Problem
  162. Gretsch playboy amp vibrato problem
  163. Marshall MG100HDFX repair?
  164. my mg100dfx problem
  165. Testing OT's
  166. Engl Fireball Trouble
  167. Fender PCB pots
  168. Solder/Desolder Station
  169. Marshall JCM 2000 reverb query
  170. Power tranny gets HOT in old Guild amp
  171. Ampeg SS-70CA schematics?
  172. Bias Circuit Problem
  173. Peavey Valveking switching help!
  174. Crate VC120H schematic needed.
  175. New Guy, 5150 question.
  176. JTM45 build - channel volume problem
  177. Hartke 3500 MOSFET Output Transistors
  178. power tran buzzing
  179. Peavey Classic 30, no sound until turned off.
  180. 1950's Ampeg Amplifier
  181. DSL Hum, C46 question
  182. Rivera Clubster 45 hissy
  183. mesa oscillation
  184. Quick Questions Acoustic 370 head
  185. Troubleshooting noise issue
  186. JMP-1 Faulty
  187. Epiphone Valve Standard- Please Help?
  188. troubleshooting ?- Hum
  189. SVT-VR bias issue
  190. Crate G20 XL SCG Circuit Problem
  191. HRD plate load resistors, anything else?
  192. Marshall MG50DFX level problem
  193. Terrible fizzing
  194. Peavey Mace Question
  195. Is this circuit ok or has it been hacked? Please advise (vintage tube amp)
  196. Princeton Chorus Breaks up on clean channel, chorus gets stuck...
  197. peavey century 200 bass series
  198. Underfiltering??
  199. Masco MAP-120N
  200. Mesa Boogie Mk3 Schematics, layout etc
  201. Blues Deluxe low volume no clean
  202. TL072 or 4558 in a Blues Jr Reverb
  203. Hot Rod Deluxe 6L6WGC too hot?
  204. Ampeg Gemini II wiring help needed
  205. 5E3 tweed deluxe home build just died
  206. Legend A 30 amp
  207. VoxAC30 CC phase inverter problem?
  208. JCM2000 DSL wiiieeerrdd problem
  209. classic 50
  210. solid state problems
  211. XR700 Power Mixer clips, low volume
  212. Acoustic 122 schematic
  213. Laney LC50/2 PCB removal?
  214. bridge rectifier problems
  215. Trace Elliot TA100R schematic
  216. Heater voltage too high!
  217. laney vc30 wooshing noise
  218. Dead Blues Deville
  219. no Name tube amp acting strange
  220. Matchless DC30: noise, pops and scratchy volume pot
  221. Marshall AVT150HX Schematic
  222. Selenium rectifiers
  223. isolation transformer - high voltage.
  224. Marshall Valvestate 100 Problem Please Help :)
  225. Marshall V8080 pot list
  226. Ampeg VL-503 schematic
  227. Cap wiring help please.
  228. Filter Cap Values?
  229. Ampeg B-100 (solid state)
  230. Hot Rod Deluxe is too hot (accoustically)
  231. Gibson GA79RVT Reverb motorboating
  232. fender stage 112 "pop,crackle"
  233. Vox AC-30/6 TB problem
  234. About biasing tube guitar amplifiers
  235. problem with an ENGL Sovereign amp
  236. Mesa Mark IV problem
  237. Rumble 100 schematic
  238. Multicap sources?
  239. AC15 questions
  240. Brown Deluxe plate voltage
  241. Peavey 6505 Plus on tour
  242. Fender red knob twin pops when using push pull pots...
  243. EH BassBalls problem
  244. AC30/6 TB constant feedback
  245. Testing Caps
  246. 1 6L6 (of 6) at 2x bias Super Twin Reverb
  247. SVT CL cuts out. Speaker Cab or Amp??
  248. Reverb pan for a R12R Reverberocket???
  249. Princeton Reverb and unwanted Distortion
  250. Crappy input jacks on 65 Deluxe only lasted 43 years.