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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Bias -V pin 5 jtm60
  2. Marshall JCM 900 New Tubes
  3. jcm 200 dsl 100 head blowing H.T. fuse with the effects loop.?
  4. Unsteady Bias on 5F6A
  5. GK1001rb - Help!
  6. Fender Twin Po Tube = 100 watt boat whistle
  7. Bad power tube or oscillation?
  8. Speaker Recone?
  9. Bias Question - Rookie Needs Guidance
  10. 65 Fender Twin Reissue - No Reverb
  11. Seek OT-215 Substitute
  12. Testing caps?
  13. Transformer shunt bias adjustment
  14. 5150 vs. 380V
  15. Gibson Duo-Medalist - too much treble, not enough volume!
  16. JCM 2000 DSL 100w help - audio problems, burning smell
  17. Floor vs. Wall Mounted Reverb Pans???
  18. Roland Studio 6V troubleshooting question
  19. Finding the source (hissing problem)
  20. favorite wire stripper for small guage wire?
  21. Transistor search. 2sk184gr & 2sk363gr
  22. Looking for Dome Knobs with Dot Pointer
  23. Noise from logo light
  24. Firefly - First build problems
  25. Super Reverb RI resonance/microphonics? Weird.
  26. Pv 2000
  27. problem with filament rectified supply
  28. Hum - PT inducing this into the OT?
  29. 70's Ampeg SVT crackling, popping, fan problem
  30. Question about Mesa MkIIB schematic....
  31. When to change tubes on mesa boogies?
  32. loud popping volume.
  33. Microphonics driving me nuts!
  34. JCM800 Burning Tubes - HELP!!!
  35. Pedal problems
  36. Funky axial electrolytics
  37. Need info on Crate PA-B8350
  38. Ampeg VT-22 question
  39. My peavey bandit works rather weird
  40. HR DeVille 112 noise
  41. ? about LM3080N used in a peavey amp
  42. Bogen CHB 35A Always a bit Distorted
  43. 70's Ampeg SVT repair help needed
  44. fender tube
  45. To crimp or NOT crimp
  46. BF Super Twin Reverb - Burnt resistor
  47. JCM 900 dual reverb effects loop problem
  48. TRRI blew up - no power - please help
  49. Ampeg svp1600
  50. Ampeg B-15T
  51. Mesa Mark 3 preamp tube heater voltage
  52. QUESTION: Biasing a '65 Reissue Deluxe Reverb
  53. fender deluxe 90 DSP problem
  54. overcompressed sound in new amp
  55. Kustom Dual 35 DFX Schematics
  56. how does it work?
  57. Mesa MkII bias caps
  58. DR Treble response
  59. blues deville floating relay
  60. ESR Meter
  61. power supply caps
  62. AC15 reissue problems
  63. SF Twin Reverb Distortion - Filter Caps???
  64. Ampeg SVT 400 T Distortion
  65. Peavey Bandit 112 Transtube - Dodgy pots?
  66. plate resistor problem....?
  67. Acoustic 470 Lamp Driver Issue
  68. Problem with DR reverb driver
  69. vox valvetronics self test mode
  70. peavey 5150 / marshll 1987x
  71. Mesa Boogie Mark 3 Gain Loss
  72. speaker wiring question
  73. Danelectro Cadet 122 problems
  74. Ampeg SB12 Hum
  75. randall bass amp distorts
  76. Showman tremolo on without footswitch
  77. Frontman 25R Channel Switching/Footswitch Problem.
  78. Fender M-80
  79. 86 Carvin X100 trouble.No Volume,cooked resistor
  80. parasitic?
  81. VS65R - No Output, Preamp works
  82. Need help with Fender Schematic
  83. Marshall Valve Problem
  84. Arcing in power tubes
  85. Fender HD Deluxe -Update on using different dropping resistors
  86. Marshall DSL 401 No Sound! Really Need some help!!
  87. marshall that whistle
  88. Randall distorts
  89. Marshall tubes marked vlve000..etc
  90. Help: Diagnosing Non-Functional Reverb
  91. Mystery Caps in my amp??? need help
  92. Fender Champion 600 Switch
  93. Sunn Beta Lead blown?
  94. Ampeg VT60 schematic needed
  95. RE-301 noise on reverb
  96. 22/33uf Filter Caps
  97. Ultra 112 Ch. Switching Nightmare.....
  98. Advice for learning
  99. Biasing Ampeg amp Teach me!
  100. Behringer GMX110 - 20vDC at Speaker Output
  101. Peavey Transformer 112; loud hum
  102. Jcm 2000 marshall Dls 100
  103. Need Help/Advise
  104. Mesa MkIIB - Relay Buzzing
  105. Could it be this simple? (Fender Dual Pro)
  106. 4 Tube amp Questions for noob
  107. Noisy Elmwood - could it be damaged?
  108. Triple Rectifier - hissing
  109. QUESTION: How to Diagnose a defective speaker?
  110. Help with marshall jtm-30 & 60
  111. 68 'twin Vibrato
  112. AC30 needs retubing
  113. Old Princeton Reverb keeps blowing fuses
  114. Morley EVO-1 oilcan echo
  115. SVT fan coming through speakers
  116. MG100HDFX - Help required please.....
  117. Amp crackle with note - I'm stumped!
  118. Unspecific Peavey 5150 question...
  119. Black face Dual Showman ??s
  120. Fender Hotrod Deluxe poweramp distorting
  121. Vox AD60VT loses memory when using foot controller
  122. Amps blowing fuses. Please help.
  123. power tubes flashing along with trem, help!
  124. Yamaha G50-112 Schematic Needed
  125. peavey clone again
  126. Fender Ultimate Chrous
  127. Roland Cube60 problem
  128. Peavey Classic 30 1x12 gone dead
  129. Blues Deluxe Reissue low volume
  130. magantone 431 chirping when vibrato is on
  131. Kendrick Gusher
  132. DRRI question????
  133. transformer wiring
  134. Vox AC-15 Problem
  135. SVT-2 Pro problems
  136. No output from 5150II
  137. Installing 3 prong cord in GA5
  138. Cornford Hurricane Reverb issue
  139. Need Output Modules for MF350
  140. Low Power w/ SF Bassman
  141. Help!!! Marshall DSL 401 Issue!!!
  142. fender princeton 650 making popping noises
  143. Dsl 401
  144. Rusted SVT transformers
  145. Fender reverb send/return as effects loop?
  146. Music Man 2275-65 break-up
  147. Acoustic 150b unwanted disortion
  148. Behringer BX1200 low Output
  149. Silvertone 1482
  150. Russian 6V6's arcing internally
  151. peavey classic 50 won't turn on, burnt cap.. help!
  152. Treble Control popping noise
  153. scratchy presence pot
  154. Rivera R55 cap popped
  155. Amp cuts out at loud volume
  156. Marshall hdfx schems?
  157. SJ 83100 transistor data sheet
  158. Can I bias my 6505+ / 5150-II?
  159. Question about tube pins and schematics
  160. Question about discharging capacitors
  161. Gallien Krueger fan not working
  162. Pignose B100V
  163. Music Man Capacitors
  164. Very Unstable Amp - Oscillation
  165. Should these resistors be replaced? Pic
  166. Verlage VTR-100 Schematic Needed
  167. JMP1 preamp battery replacement - solder or glue it in?
  168. Questions about cap job I had done
  169. SF Twin Reverb - fuse blowing
  170. vox valvetronics head
  171. Marshall TSL 122: Almost no volume
  172. My amp won't come off standby... please help.
  173. Invader 60 1970's Head
  174. Fender Rumble 100 Extension Speaker
  175. Oh my god!!!!!!!
  176. Mesa Simul 2:90
  177. Peavey XR400 fried 200H module
  178. jcm900
  179. Looking for vox info
  180. Trace Elliot V-type preamp noisy ground
  181. Peavey TNT100 - DC298 dead transformer
  182. line out for peavey tnt 100
  183. JCM900 chips?
  184. Peavey classic duel 212 scratchy popping noise
  185. Recapping Gibson G-10 questions
  186. Marshall caps....what type?
  187. Trying to repair the tremolo in a Silvertone 1472
  188. Pa 100, updates and prob with reverb
  189. Carvin PB150 biasing
  190. Marshall Valvestate 8008 pots, log or lin?
  191. No reverb in Hot Rod Deluxe
  192. Fender 65 Deluxe Reverb RI shutting down...
  193. ampeg v4 buzzing output with just power switch on
  194. Fender Ultra Chorus, Noisey Left Channel.
  195. Amplifier cut outs
  196. Heyboer color codes
  197. Marshall AVT50H
  198. Slide on Connectors for Valve JR
  199. Acoustic 370 grounding issue, ch2 buzz
  200. Dead Harmony h303a
  201. Help on Marshall AVT150H gone bad..please
  202. G-dec
  203. Sound Fluctuation with Single Rectifier! HELP
  204. Sound Fluctuation with Single Rectifier! HELP
  205. Marshall mg250dfx...HELP
  206. Need work from an amp tech...
  207. Yamaha P7000S
  208. Burning Fuses
  209. Marshall squeals like a pig
  210. Acoustic 320, low output (again!)
  211. tiny terror clone -> just humm, sound
  212. Pignose G40v- maintenance?
  213. HA3500a with a very hot Heatsink
  214. old Laney 610v B+ what tubes?
  215. Noob, did I hurt my new amp?
  216. Hot Rod Deville - speaker mounting screws
  217. Fender Pro 185 need resistor
  218. What the heck is B+, and that A on AA764 Champ Schematic?
  219. Marshall JCM2000 DSL 100 biasing?
  220. What output transformer for Mesa Boogie Studio .22 +
  221. Tubes too hot for OT?
  222. Hartke 7000 output bad with load
  223. fender princeton amp. ?????????
  224. Hartke 3500 no output...photo enclosed
  225. Where's the reverb
  226. Power Caps bleed how fast? Does that indicate condition?
  227. Fender Deluxe Reverb re-issue
  228. Sovtek Mig 50
  229. wanted : transfo for Ampeg B2R
  230. "Thumping" tremolo circuit
  231. Roland Jazz Chorus repair NYC
  232. 5y3 GT in 6G2 Princeton
  233. SF 1969 Champ, what is causing "chirping" ?
  234. Marshall Vintage Modern 2466 Schematic?
  235. Please please help svt classic problem
  236. Roland Jazz Chorus
  237. Very old pignose 7-100
  238. Peavey Delta Blues
  239. Marshall JCM2000 TSL feedback on clean channel
  240. Traynor 7027 sub?
  241. Fender 30 - channel switch pops
  242. Ampeg V4-b, bad 6k11 stage...
  243. Tubeworks schem?
  244. VOM MOdel 700
  245. Yamaha Bass Combo YBA-100
  246. supro loss of volume
  247. Removing the chassis...
  248. Vox Berkeley ll Low output
  249. Biasing amps with PCB mounted power tube sockets....
  250. Marshall JMP1 with flaky power button