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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Need help! channel and crunch switch not working!!!
  2. need diagnosis help for dead amp
  3. Bridge rectifier issue...
  4. Mig-50 PI type parasitics after a few hours
  5. Fender Princeton Chorus
  6. Peavey Bass 400 m3 DC on Output
  7. Ampeg B-15T distortion
  8. Unidentified Model
  9. peavey 5150 sounds bad
  10. Vibro Champ Rebuild - Plate voltage high
  11. Bugera 333xl sounds bad suddenly
  12. Crate GTX212 Squeals on power up
  13. Crate PX-600 Whistles when turned off
  14. G1 amp in a Case
  15. Fender Frontman 15G 60hz Hum
  16. Peavey Vypyr 15 problems
  17. Carlsbro top 50 OT installation
  18. Help with Peavey Bravo
  19. Traynor Bassmaster Tubes
  20. Hum in DIY preamp
  21. Yamaha G50 112
  22. Sunn concert bass repaires
  23. NO sound out of 30 watt Peavey Delta Blues!
  24. Ruby EL84
  25. Quiet champ, blown OT?
  26. Need help yesterday
  27. Yamaha fifty 210, G50-210
  28. Diagnose a cheapo amp?
  29. Old Amp Hum
  30. Noisy presence pot
  31. Vintage Ampeg SVT troubles
  32. Trace Elliot SuperTramp Twin losing power
  33. Bassman reissue problem
  34. Gibsonette 6V6GT Biasing
  35. Traynor YGM-replaced filter caps/NF mod and now volume works strange...
  36. Fuzzy signal to speaker on Peavey Nashville 400
  37. Tube holder for Peavey Classic 30? Hmm, I wonder if there is suc a beast??
  38. Fender "The Twin" noise in channel 2
  39. help with Fender PD 150 Deluxe (Passport POS)
  40. Fender Reverb FR 1000
  41. Crate GT-50H Combo Amp
  42. Another Marshall MG50DFX with no sound...?
  43. Power Transformer Heat
  44. Glockenklang Soul
  45. Marshall MG250HDFX No Output
  46. Was given a Marshall MG 50DFX but no volume
  47. Marshall JCM 2000-DSL50 output issue
  48. Marshall Valvestate VS30- Hum/No Output
  49. Marshall 8080 - Lack of volume on boost channel.
  50. Shorted Transistors in a Crate PX-600DP
  51. encore 65 - problems/distortion/reverb
  52. Peavey 5150 has lost it's Gain... Help
  53. JCM 600 bias problem
  54. Amp tune -up?
  55. Mackie SWA 1501 fuse blowing
  56. Phase Inverter Test
  57. Please Help troubleshoot Vibroverb
  58. Yamaha G50-112II DC Board
  59. Hughes and Kettner Trilogy switching
  60. 67-68 Bandmaster
  61. Crossover part please
  62. Crate Vintage Club 50 causing fits
  63. SF Bandmaster L.F. Oscillation
  64. CARLSBRO GRX7 MIXER PA AMP INTERNAL FUSE BLOWS Help Please
  65. Audible oscillation while plugged into dummy load
  66. buying tube ?
  67. help with fender deluxe 90 dsp
  68. Fender Hotrod Deville prob.
  69. hum problem in swr basic black
  70. Super Champ XD Stuck On Channel 2
  71. Appreciat Diagnostic Help for Old Roland Orange Cube-60 Guitar Amp
  72. Help: Removing cap cans heavily soldered to chassis on Traynor YGM-3
  73. AVT150H Valve Replacement
  74. Vox JMI AC30 (1964) Servicing
  75. Schematic for Lexicon Signature 284
  76. Fender Deluxe 112 problem (cracking/popping)
  77. are my tubes matched or not ?
  78. dsl 401 no sound
  79. Orange Rocker 30 Head Case
  80. Half Tube Tremolo/Vibrato?
  81. Finding tube sockets with 1-3/8" mounting center
  82. Replacement diodes for Reverbojet rectifier
  83. Can I Super Glue A Loose Tube To It's Base?
  84. Fender 'Twin Amp' c2002
  85. Death cap
  86. AVT150H, fuse and resistors.
  87. Ticking in Princeton Reverb Tremolo...
  88. Hartke 3500 power amp module - any replacements?
  89. Bias current vs class op question.
  90. Fender Cyber Twin no master Volume
  91. Ampeg SVT 6 Mosfets
  92. capanalyzer 88 series 11
  93. Popping Fuses. Op-amp replacement question...
  94. help!(faulty behringer bx1200)
  95. bugera 333xl effects loop problem
  96. Hiwatt Classic 100 power section
  97. Dual Marshall Footswitch
  98. troubleshooting Fender 3016 amp
  99. Hot rode deville no sound
  100. The Marshall AVT50 R58 problem
  101. Sovtek Mig 50 shorted tube.
  102. microphonic chassis problem
  103. Peavey bandit 65 feedback problems
  104. Behringer vintager GM110 troubles
  105. Soundcraft GigRac 1000ST, major problems ? blown?
  106. Blinking Channel LEDs with side of noise
  107. Converting: 220 - 117V
  108. 1976 Fender Champ hums 60hz always
  109. SWR Silverado power-up problem
  110. Crate V-33 Do any of these last?
  111. Help with IORIO amp problem/output tranny?
  112. Evans amp schematic ?
  113. Lord Valve where are you?
  114. "Blows Fuses" and "Is my transformer dead?"
  115. Marshall AVT 50x OD channel problem
  116. SWR Bass amp fan issue
  117. Speaker Ohms Question
  118. AMpeg SVT-CL Unholy Noise
  119. Crate Vintage Club 50, Input Jack Issues?
  120. Peavey Stereo Chorus 212 Schematic?
  121. ID this part ?
  122. Danelectro DM10 thumping
  123. Ampeg SVT 4 T schematic??
  124. HELP with wiring a Teisco Checkmate CM-10
  125. Old Fender fiber boards
  126. Old Fend. Transf. Primary Colour Codes
  127. Configurable Dummy Resistor Load Box for Amp design/repair
  128. Amp trouble
  129. Schematic Request Peavey Envoy 110
  130. Connecting a 110V amp to 240V - possible?
  131. B-15 Crackle
  132. faint signal at zero volume
  133. Hot Rod Deluxe - Mystery
  134. Help the newbie with an Encore 65, distorted
  135. Acoustic Control G100t
  136. 66 Vibro Champ needs some help
  137. Video of hum when I switch on the reverb of my Twin Amp
  138. New power transformer issues
  139. Crate BV120H bias?
  140. varistor touble
  141. Crate Palomino v16 Schematic?
  142. PV classic 30 PT?
  143. Sunn 300 T Bias / Balance issues
  144. Marshall JCM2000 has no sound
  145. JCM 800 2205
  146. Mesa Boogie Formula Pre - Relay
  147. Fender cab question
  148. B+ to high on homebrew
  149. Roland JC120
  150. peavey VB2 schematic
  151. Another peavey 400 bh problem
  152. Ampeg B2 Voltages
  153. Fender 'Twin Amp'
  154. Marshall MG 100HDFX-Clean switching?
  155. Line-in confusion
  156. 1968 Duo Medalist switch issue
  157. Vibro Champ Heater Wiring
  158. Amp troubles!
  159. Randall RG200
  160. Where's the best place to buy filters, caps, etc?
  161. Replaced V1 plate resistor, now I am getting squealing
  162. '79 JMP 50. Old tubes cause low bias voltage?
  163. Fender SK 100B pre amp section out
  164. marshall tsl60 switching problems
  165. Your thoughts on Filter Caps.
  166. Mesa Boogie .50 Caliber Amp - Low Output On Overdrive Channel
  167. MIG100 - Replacing output jacks
  168. Crackeling Peavey Classic 50/50
  169. TSL 602 'Squawking'
  170. Gibson GA42RVT repair issues
  171. Blue glow on the inside glass
  172. 62 Ac30 Distorting :(
  173. peavey delta blues ?
  174. Marshall AVT150H channel switch popping
  175. Rivera K-tre too loud and hissing
  176. yamaha G50-112II
  177. Peavey XR1200 Repairs In Progress - Help Requested
  178. Ampeg B-2 Fan Trouble
  179. '67 bandmaster - intinsity pot for tremolo doesn't start working till about 5
  180. crate gfx-212 - bad input?
  181. G1 amp in Case
  182. Rectifier path of travel
  183. Marshall Valvestate 8080 big noise when starting up
  184. Mesa Stiletto problem
  185. Marshall Mode Four
  186. Ampeg SVT 5Pro Schematic
  187. Radial Headbone
  188. Anybody got a gut shot of a Gibson Ranger GA20?
  189. Mesa Boogie 50 Caliber + red plating
  190. Ampeg SVT 4 Pro curcuit breaker
  191. Ampeg BT25
  192. classic 30 with low volume and odd sounding distortion
  193. PV XR400b mixer/amp with 200 H power module low output
  194. Sunn Beta Lead power transistor
  195. Problem with a Mesa Boogie Dual Recifier
  196. mesa boogie 3 channel triple rectifier switching channels by itself , other noise
  197. FRED Diodes For A Kustom 200B?
  198. SF 135Watt: Dropping the B+ voltage, and bias mod
  199. Silly Questions from a Twin Reverb owning DIY Newbie
  200. Need a little help with a Laney Gh100L
  201. Broken amp, need diagnosis help
  202. Roland Jazz Chorus 120 "Schematics needed asap"
  203. Fender Princeton 65 DSP - Low Volume and Hiss
  204. Dead Vibrato: Fender Twin Reverb Reissue
  205. Reverb issues w/ a Peavey Classic 30
  206. Post In Music Electronics - Link
  207. help with a Kustom 200B
  208. Valvestate 8080 issues
  209. ill amp 'crackles' into speaker ?
  210. Acoustic Model 123
  211. Motorboating issue
  212. Fender Acoustasonic II SFX problem
  213. Hartke 3500 relay problems?
  214. VOX AC30/6 TB scratchy static noise
  215. Help ID a Mains transformer for 135W Twin
  216. Signal tracing rules
  217. Fender Hot Rod Deluxe won't play!
  218. Hot Rod Dlx Fizzy artifact!
  219. need help fixing my fender fm 212r
  220. almost a 6G6 build
  221. Tech-Caps???
  222. Crate GLX65 Question; Working Amp w/ no Sound from Speaker
  223. Marshall DSL 2000?? SO confused!!
  224. re:Peavey XR600B
  225. Taking the next step in my builds and repairs.
  226. Swr la series chirps on power up
  227. Tonefullness of one cap over another
  228. Low V supply issue Firebass 700
  229. LANEY VH100r Power tranformer buzz fixed ...
  230. Polytone - blown power transistor
  231. wave -like sounds
  232. marshall avt 150 h
  233. Crate GX-15R doesn't work - Any ideas?
  234. rca soldering
  235. Deluxe Reverb Mod or mix-up?
  236. Fender Twin Hum Hum Hum
  237. Major goof, major problem OT
  238. Crate V50 ?
  239. Ampeg SVT5 Pro
  240. High-Frequence Noise at Roland Bolt-30
  241. What Reverb Tank for a Yamaha Fifty 112?
  242. Power Amplifier Repair
  243. Problem with Fender Princeton DSP
  244. Peavey VTM 60 Blows fuse
  245. clean channel gone on my little Fender Champ 30 - fixable?
  246. Ampeg SVT 5 Pro
  247. redplate/biasing issue
  248. Behringer GMX212
  249. Amp/Guitar Temperature Sensitivity
  250. fizz and oscillation in Peavey Rockmaster head