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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Shorted Transistors in a Crate PX-600DP
  2. encore 65 - problems/distortion/reverb
  3. Peavey 5150 has lost it's Gain... Help
  4. JCM 600 bias problem
  5. Amp tune -up?
  6. Mackie SWA 1501 fuse blowing
  7. Phase Inverter Test
  8. Please Help troubleshoot Vibroverb
  9. Yamaha G50-112II DC Board
  10. Hughes and Kettner Trilogy switching
  11. 67-68 Bandmaster
  12. Crossover part please
  13. Crate Vintage Club 50 causing fits
  14. SF Bandmaster L.F. Oscillation
  15. CARLSBRO GRX7 MIXER PA AMP INTERNAL FUSE BLOWS Help Please
  16. Audible oscillation while plugged into dummy load
  17. buying tube ?
  18. help with fender deluxe 90 dsp
  19. Fender Hotrod Deville prob.
  20. hum problem in swr basic black
  21. Super Champ XD Stuck On Channel 2
  22. Appreciat Diagnostic Help for Old Roland Orange Cube-60 Guitar Amp
  23. Help: Removing cap cans heavily soldered to chassis on Traynor YGM-3
  24. AVT150H Valve Replacement
  25. Vox JMI AC30 (1964) Servicing
  26. Schematic for Lexicon Signature 284
  27. Fender Deluxe 112 problem (cracking/popping)
  28. are my tubes matched or not ?
  29. dsl 401 no sound
  30. Orange Rocker 30 Head Case
  31. Half Tube Tremolo/Vibrato?
  32. Finding tube sockets with 1-3/8" mounting center
  33. Replacement diodes for Reverbojet rectifier
  34. Can I Super Glue A Loose Tube To It's Base?
  35. Fender 'Twin Amp' c2002
  36. Death cap
  37. AVT150H, fuse and resistors.
  38. Ticking in Princeton Reverb Tremolo...
  39. Hartke 3500 power amp module - any replacements?
  40. Bias current vs class op question.
  41. Fender Cyber Twin no master Volume
  42. Ampeg SVT 6 Mosfets
  43. capanalyzer 88 series 11
  44. Popping Fuses. Op-amp replacement question...
  45. help!(faulty behringer bx1200)
  46. bugera 333xl effects loop problem
  47. Hiwatt Classic 100 power section
  48. Dual Marshall Footswitch
  49. troubleshooting Fender 3016 amp
  50. Hot rode deville no sound
  51. The Marshall AVT50 R58 problem
  52. Sovtek Mig 50 shorted tube.
  53. microphonic chassis problem
  54. Peavey bandit 65 feedback problems
  55. Behringer vintager GM110 troubles
  56. Soundcraft GigRac 1000ST, major problems ? blown?
  57. Blinking Channel LEDs with side of noise
  58. Converting: 220 - 117V
  59. 1976 Fender Champ hums 60hz always
  60. SWR Silverado power-up problem
  61. Crate V-33 Do any of these last?
  62. Help with IORIO amp problem/output tranny?
  63. Evans amp schematic ?
  64. Lord Valve where are you?
  65. "Blows Fuses" and "Is my transformer dead?"
  66. Marshall AVT 50x OD channel problem
  67. SWR Bass amp fan issue
  68. Speaker Ohms Question
  69. AMpeg SVT-CL Unholy Noise
  70. Crate Vintage Club 50, Input Jack Issues?
  71. Peavey Stereo Chorus 212 Schematic?
  72. ID this part ?
  73. Danelectro DM10 thumping
  74. Ampeg SVT 4 T schematic??
  75. HELP with wiring a Teisco Checkmate CM-10
  76. Old Fender fiber boards
  77. Old Fend. Transf. Primary Colour Codes
  78. Configurable Dummy Resistor Load Box for Amp design/repair
  79. Amp trouble
  80. Schematic Request Peavey Envoy 110
  81. Connecting a 110V amp to 240V - possible?
  82. B-15 Crackle
  83. faint signal at zero volume
  84. Hot Rod Deluxe - Mystery
  85. Help the newbie with an Encore 65, distorted
  86. Acoustic Control G100t
  87. 66 Vibro Champ needs some help
  88. Video of hum when I switch on the reverb of my Twin Amp
  89. New power transformer issues
  90. Crate BV120H bias?
  91. varistor touble
  92. Crate Palomino v16 Schematic?
  93. PV classic 30 PT?
  94. Sunn 300 T Bias / Balance issues
  95. Marshall JCM2000 has no sound
  96. JCM 800 2205
  97. Mesa Boogie Formula Pre - Relay
  98. Fender cab question
  99. B+ to high on homebrew
  100. Roland JC120
  101. peavey VB2 schematic
  102. Another peavey 400 bh problem
  103. Ampeg B2 Voltages
  104. Fender 'Twin Amp'
  105. Marshall MG 100HDFX-Clean switching?
  106. Line-in confusion
  107. 1968 Duo Medalist switch issue
  108. Vibro Champ Heater Wiring
  109. Amp troubles!
  110. Randall RG200
  111. Where's the best place to buy filters, caps, etc?
  112. Replaced V1 plate resistor, now I am getting squealing
  113. '79 JMP 50. Old tubes cause low bias voltage?
  114. Fender SK 100B pre amp section out
  115. marshall tsl60 switching problems
  116. Your thoughts on Filter Caps.
  117. Mesa Boogie .50 Caliber Amp - Low Output On Overdrive Channel
  118. MIG100 - Replacing output jacks
  119. Crackeling Peavey Classic 50/50
  120. TSL 602 'Squawking'
  121. Gibson GA42RVT repair issues
  122. Blue glow on the inside glass
  123. 62 Ac30 Distorting :(
  124. peavey delta blues ?
  125. Marshall AVT150H channel switch popping
  126. Rivera K-tre too loud and hissing
  127. yamaha G50-112II
  128. Peavey XR1200 Repairs In Progress - Help Requested
  129. Ampeg B-2 Fan Trouble
  130. '67 bandmaster - intinsity pot for tremolo doesn't start working till about 5
  131. crate gfx-212 - bad input?
  132. G1 amp in Case
  133. Rectifier path of travel
  134. Marshall Valvestate 8080 big noise when starting up
  135. Mesa Stiletto problem
  136. Marshall Mode Four
  137. Ampeg SVT 5Pro Schematic
  138. Radial Headbone
  139. Anybody got a gut shot of a Gibson Ranger GA20?
  140. Mesa Boogie 50 Caliber + red plating
  141. Ampeg SVT 4 Pro curcuit breaker
  142. Ampeg BT25
  143. classic 30 with low volume and odd sounding distortion
  144. PV XR400b mixer/amp with 200 H power module low output
  145. Sunn Beta Lead power transistor
  146. Problem with a Mesa Boogie Dual Recifier
  147. mesa boogie 3 channel triple rectifier switching channels by itself , other noise
  148. FRED Diodes For A Kustom 200B?
  149. SF 135Watt: Dropping the B+ voltage, and bias mod
  150. Silly Questions from a Twin Reverb owning DIY Newbie
  151. Need a little help with a Laney Gh100L
  152. Broken amp, need diagnosis help
  153. Roland Jazz Chorus 120 "Schematics needed asap"
  154. Fender Princeton 65 DSP - Low Volume and Hiss
  155. Dead Vibrato: Fender Twin Reverb Reissue
  156. Reverb issues w/ a Peavey Classic 30
  157. Post In Music Electronics - Link
  158. help with a Kustom 200B
  159. Valvestate 8080 issues
  160. ill amp 'crackles' into speaker ?
  161. Acoustic Model 123
  162. Motorboating issue
  163. Fender Acoustasonic II SFX problem
  164. Hartke 3500 relay problems?
  165. VOX AC30/6 TB scratchy static noise
  166. Help ID a Mains transformer for 135W Twin
  167. Signal tracing rules
  168. Fender Hot Rod Deluxe won't play!
  169. Hot Rod Dlx Fizzy artifact!
  170. need help fixing my fender fm 212r
  171. almost a 6G6 build
  172. Tech-Caps???
  173. Crate GLX65 Question; Working Amp w/ no Sound from Speaker
  174. Marshall DSL 2000?? SO confused!!
  175. re:Peavey XR600B
  176. Taking the next step in my builds and repairs.
  177. Swr la series chirps on power up
  178. Tonefullness of one cap over another
  179. Low V supply issue Firebass 700
  180. LANEY VH100r Power tranformer buzz fixed ...
  181. Polytone - blown power transistor
  182. wave -like sounds
  183. marshall avt 150 h
  184. Crate GX-15R doesn't work - Any ideas?
  185. rca soldering
  186. Deluxe Reverb Mod or mix-up?
  187. Fender Twin Hum Hum Hum
  188. Major goof, major problem OT
  189. Crate V50 ?
  190. Ampeg SVT5 Pro
  191. High-Frequence Noise at Roland Bolt-30
  192. What Reverb Tank for a Yamaha Fifty 112?
  193. Power Amplifier Repair
  194. Problem with Fender Princeton DSP
  195. Peavey VTM 60 Blows fuse
  196. clean channel gone on my little Fender Champ 30 - fixable?
  197. Ampeg SVT 5 Pro
  198. redplate/biasing issue
  199. Behringer GMX212
  200. Amp/Guitar Temperature Sensitivity
  201. fizz and oscillation in Peavey Rockmaster head
  202. Classic 50 tube biasing?
  203. i have damaged my Crate VFX,please help..
  204. 6G12-A Concert clone behaving oddly
  205. Roland Cube 60 -- missing reverb
  206. Peavey Heritage VTX Series
  207. Blues DeVille reissue squealling preamp
  208. Substitute GZ34 for 5U4GB?
  209. Princeton Reverb Re-work
  210. No sound from speaker..?
  211. AC at pin 8 on a 6V6
  212. Pot replacement....I got "shafted"
  213. Keeps blowing the fuse
  214. Blues deluxe..same ole' problem
  215. Color coded capacitor
  216. Miscellaneous Question About Amp Damage
  217. Weber 6a14hp buzz when reverb is on.
  218. line 6 flextoneII hd head problem
  219. Ultimate Chorus
  220. Guitar Research T64RS TUBE
  221. Roland Bolt 60 reverb tank?
  222. Fuse Pops - Transformer Dead
  223. Orange rockerverb owners?
  224. Lafayette (or Univox??) U-80A mystery amp
  225. identify a transformer
  226. Bassman 100 - Should it be louder?
  227. Super Champ XD
  228. Amp Tech Needed in So Cal...
  229. Fender Princeton Chorus problems
  230. Marshall MG100dfx
  231. Marshall Super lead 1959 Problem
  232. JTM45 Build Buzz Problem
  233. Svt 4 pro tubes??
  234. Question about Marshall Valvestate 8100
  235. Marshall JMP 50 watt bias
  236. Traynor yvm-1 voice master acting funny - - -
  237. Fender Concert II problem ( preamp)
  238. Sticker on power tubes? Harmful?
  239. Need pot volume control for op pro preamp Ovation Guitar
  240. Marshall AVT150 Blown Fuses
  241. Diodes for a Twin
  242. Hiwatt Classic 50 Crackling when cranked
  243. NOS 6L6 vs Currently made 6L6
  244. More failed Jamicon 12,000u 80v
  245. Fender Super Reverb AA763 Bias
  246. marshall 8080 pot problems
  247. Need help with Fender Twin Reverb
  248. Vibrolux low volume
  249. Slightly off topic, but strange
  250. High voltage on pin 1 of V5 in '67 Super Reverb