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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Bassman - no headroom
  2. trouble wiring up heaters
  3. Fender Performer Problems.
  4. H&K Triamp MKII question
  5. Magnatone 460 output impedance
  6. Sound City PA50+ low volumen...
  7. sparked bias supply, dead.
  8. Peavey Classic Head
  9. Mesa MK I RI Tweaking
  10. Trace Elliot C100 Speed Twin Trouble
  11. Burning smell...
  12. Ampeg V4 Troubleshooting Help
  13. EL84 Acceptible load range (Single Ended operation)
  14. BF Super Reverb Question
  15. rating power MosFets?
  16. twin amp red light
  17. Bassman PI resistors
  18. 120 Hz Hum in Solid State Amp
  19. Vox AD15VT sound problem
  20. bedrock 1200 Questions
  21. Crate Turbo Valve 60 help
  22. Problem with Ampeg B1RE
  23. Marshall MKII schematic
  24. Sovtek MIG 50 help please
  25. Excessive hum
  26. Old Peavey TNT 100 SS Series Has Low Distorted Output
  27. Marshall MF350
  28. New Guy With A Question.....
  29. Orange Rockerverb Noise Problem
  30. Peavey Classic 50 212 wierdness
  31. jc120 speaker wiring
  32. Strange Feedback with medium/high gain
  33. Troubleshooting motorboating
  34. B-52 At100 Head Repair HELP PLease!!!!!!!
  35. Fan noise
  36. Laney LC15 Volume Fluctuation, Suspect Pots
  37. Need a 5/10/20 Cap for Silvertone
  38. HH VS Series schematic
  39. Turntable service stand - a little off the forum
  40. EL34 reliability mod
  41. What can cause spring reverb tank to fail?
  42. Fender Dual Showman Reverb Problem
  43. Power Transformer testing? (kinda long)
  44. Fried J & Hyde
  45. Ampeg VT-22 slight mishap
  46. Marshall JTM60 Trim Pot Location
  47. 6FQ7 phase inverter
  48. B+ fuse killer
  49. no sound
  50. Tremolo all bunched up
  51. phase inverter in the 30th anniversary
  52. Marshall JCM2000 DSL50 hum
  53. Fender opto isolator "roach" which end is which?
  54. Peavey Classic 50/212 ... Standby Issues!
  55. Trace Elliot Velocette 110
  56. twin reverb trem not working
  57. Fender stage 100 ? very weak dist sound
  58. Ampeg 7027A Power Tubes Replacement Blues
  59. TSL100 Bias Problems
  60. Mesa Triaxis Memory Loss
  61. Circuit Board issue!!!!!
  62. 65 Deluxe reissue pots
  63. Adjusting BIAS in Sovtek Tube Midget 50H Head
  64. annoying hum
  65. Peavey Classic Dual Death Cap Question
  66. Biasing a Fender Blues Junior Question
  67. Peavey Bandit Reverb Issue
  68. 1973 Marshall
  69. Fender Pro Junior: Problem or Normal? Help!
  70. Hafler T2 Tube Preamp
  71. Please Help Marshall Tsl Problem
  72. 1979 Peavey Bass 400 MarkIII
  73. Fender SRRI Can't Bias Hot Enough
  74. Marshall JTM60 Output mystery??
  75. Fender "The Twin" Schematic
  76. Hartke 5000 help ?
  77. Combo or Head/Cab?
  78. Panel meter wiring
  79. Buzzing Blues Junior
  80. Marshall valvestate 8080 how to get more reverb
  81. Peavey Classic 30
  82. Vibrolux Reverb Bias?
  83. SFDR w/ MV has very low output volume...Any ideas?
  84. weird thing happens on opamp
  85. Marshall Valvestate vs100 Problem
  86. Silvertone 1474 questions
  87. What size fuse to put in O.T. center-tap?
  88. Ampeg B2 RE
  89. Setting the Mosfet bias on an Ampeg SVT 3 PRO
  90. Biasing with a "BiasProbe" basic
  91. Avt275 powers up but no sound
  92. Speaker loads
  93. Motorboating vibrato circuit
  94. Help! My amp sounds like a ring-modulator.
  95. Mesa Nomad 45 unbearable hum
  96. Shorted output leads
  97. Ampeg reverb squealing
  98. Microphonic Capacitors??
  99. SVT Classic Fan Question.
  100. Ampeg J12-B Tremelo Whoosh
  101. Peavey 6505 bias mod
  102. fender stage 112
  103. While I am at it, I might at well..........
  104. 69 Bandmaster reverb -oh the crackling noise!
  105. Marshall AVT 100 Problems
  106. Tsl 100 help
  107. checking for a bad diode
  108. No sound immediately when switched to standby
  109. Hammond M2 Repair & Restoration--help!
  110. calculating output power
  111. Repairing a Bl@nkenshib
  112. Too much B+ for the poor tubes.
  113. carvin XV-112E problems
  114. Marshall 50 Master volume with tropical fish cap?
  115. waveforms
  116. Weird reverb problems in tank? I'm baffled
  117. How much power amp affects tone
  118. SWR PB-200, What gives? Help!
  119. What's the vox pathfinder ic?
  120. Marshall parts
  121. Marshall TSL122 grid resistor values?
  122. Very low B+ in BF Vibrolux reverb
  123. Peavey Mace Problem
  124. 1974 Quad Reverb Trouble
  125. Marshall AVT50 - burned R58
  126. VOX AD60VT Question
  127. Need help with my LANEY
  128. Volume on zero, still sound?
  129. 5E3 weird distortion problem
  130. Laney rbg500 blow out
  131. SVT-4 Pro output relay
  132. Need achematic for Crate BV120H
  133. Blown OT??
  134. Traynor Monoblock schematic
  135. deluxe reverb broken
  136. Sunn 200S drawing too much current at idle
  137. blackheart strange volume control
  138. Old Peavey bass amp
  139. Yorkville Traynor Guitar Mate YGM-1
  140. Marshall DSL100 bias creep
  141. Ampeg J-12B
  142. 61 Ampeg Badge
  143. Source for d shaft pots ?
  144. Silverface Twin Reverb Blackfaced with Scratchy Buzz
  145. Schematics, Adobe, and you
  146. Marshall MG100HDFX - TD7293
  147. Marshall DSL401 Enzo???
  148. Jazzmaster schem?
  149. Fender Noise !
  150. Loud Sqeeel When Turning Amp Off
  151. Marshall AVT100 combo buzz/humm
  152. gas discharge tube= surge protect?
  153. Relay trouble
  154. Help Removing Bassmaster (YBA-1) Chassis
  155. ab165 mods and rebuild has low power and distortion
  156. VTM 60 Burnt 400 ohm/10Watt Resistor, oh my
  157. Loud screech when volume is turned all the way down.
  158. A different Kind of Power Tube Arcing
  159. Blowing Filaments?
  160. Power Tube Arcing
  161. '59 Bassman reissue question....
  162. Peavey Delta Blues buzzing
  163. HA3500 blowin' ye ol' fuse
  164. Acoustic 160 reverb hum
  165. Clicking Ampeg
  166. maine amp cct
  167. Marshall DSL401 - Fading Out
  168. Silvertone 1484 Layout
  169. Problem with my head
  170. Gibson Falcon access
  171. pot trouble
  172. Reverb trouble
  173. Peavey JSX Please Help!
  174. Ampeg J-12T "fuzzy" overtones
  175. Bassman......to mod or not to mod AA864
  176. Diode Clipping 2555SL Help
  177. What's with the new SVT's?
  178. Blackheart Little Giant problem
  179. Fender Champ no sound
  180. Blowing Fuses....
  181. Biasing a 1966 Fender Bassman
  182. Carvin BelAir Accutronics reverb tank code...?
  183. Need Schematic for Ampeg SVT3 (non pro)
  184. What value in uF and Voltage should filter caps be in a AB165 Bassman circuit???
  185. Carvin X100b Help
  186. Earthing Problem???
  187. Marshall TSL122 Extreme Issues
  188. fender 6g15 standalone reverb distortion
  189. Marshall Valvestate (VS100) Low Power Output
  190. Boss DD-3 repair
  191. Change to SF (Vibro) Champ power switch?
  192. Mesa Nomad Pots have dead spots, what's up with that?
  193. Quick question - JCM900 sl-x
  194. Old Gibson Amp
  195. Super Reverb with "issues"...:-(
  196. valvestate?
  197. Very noisy master volume pot
  198. celestion C15H-200 Bass Speaker
  199. JCM gain control cutting volume
  200. Four Terminal Pot?
  201. Simple problem with my Trace-Elliot 7210H Bass Head
  202. Blowing fuses
  203. Fender Princeton Reverb (Hum) No Sound
  204. Finished most of my cap job
  205. Peavey 5150 Combo Problem
  206. rectifier tube analysis
  207. Peavey 6505+ Lead channel....tone controls not working?
  208. Lost power in Vibrato Channel Bandmaster
  209. Ampeg BA-115 bias too high
  210. Help! Mesa Nomad 45 Reverb Failure
  211. Crate VC50 3x10
  212. Budda VerbMaster??
  213. Roland Space echo: Touchy Reverb
  214. Hartke HA3500 valve preamp no output
  215. marshall JCM 800 Bass series strange problem
  216. Figures, another 5150II blowing fuses...
  217. Question about Pro Reverb OT impedance
  218. GSP5 Digitech
  219. 220uf 100V Filter Cap?
  220. Homebrew HELP!
  221. Fender Stage160 Reverb not working
  222. 60 hz hum problem
  223. Need schematic Ampeg Sj12-R Superjet II
  224. Super reverb behaving crazzzy
  225. Clipping in tremolo circuit
  226. my amp is working like a transducer!!?
  227. Peavey Ultra 120 Plus Head PRoblemo
  228. Blown Fuses
  229. Mesa Boogie Nomad 55 Combo
  230. My 65 Champ losing it's voice
  231. Crate GX2200H - Blowing Fuses
  232. Ampeg V4 bias problems
  233. Fender power transformer european model
  234. Treble distortion
  235. Boogie DC-3 headscratcher.
  236. Need Ampeg Vt-40 And G-15vi Scematic
  237. Sunn 120 Watt valve head, no sound. What to do?
  238. EQ inductor for old Fender
  239. Need schematic for SWR LA 15 combo amp.
  240. Questions re ~1976 Twin Reverb/trashy distortion
  241. Crate BV-60H power but no sound
  242. ESR question Fender reissue Bassman
  243. GK 1001RB no output
  244. This Is Wierd....
  245. Anyone have Trace elliot schematic for GP7SM 200?
  246. Marshall AVT150 OD1 & OD2 are half the volume of the clean and AC Sim Channels
  247. Marshall Jtm 60 615 Trouble
  248. Fender Ultimate Chorus - bad hum
  249. Compu-Bias Meters
  250. Preamp squeaks - basic understanding