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View Full Version : Maintenance, Troubleshooting & Repair



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  1. A generalized chassis support for the workbench
  2. how do I get inside an Ashdown After Eight bass amp
  3. Marshall JTM45 reissue very poor tremolo
  4. Epiphone Constellation V Amp - Need Power Switch
  5. Peavey Mark III 1978 Sereis 400GH
  6. AT100 blowing random power resistors
  7. B100R pop on shutoff
  8. Fender Super Champ X2 Channel 2 and FX not working after op amp switch
  9. 1959 Vibrolux 5F11 Fender Fuse rating and 3-prong ground questions
  10. 2203 Oscillation (and solution).
  11. JCM 2000 DSL no output
  12. Marshall JMP making squealing noise
  13. Output Transformer Question: Marshall JCM900 50W
  14. has anyone worked on a roland ac 60?
  15. Marshall amp pot replacement
  16. Problem with noise using a 65amps Ventura
  17. Peavey Backstage 30 - Loud Constant Hum
  18. Testing Caps (out of circuit): What do you use and why?
  19. parallel silver mica caps opinions please
  20. Peavy CS-400 Blowing resistors
  21. Egnater Rebel 20 Plate V and other issues
  22. prosonic noise v3
  23. Roland JC160 no chorus
  24. very particular Fender amp repair / restoration in Los Angeles (Burbank / NoHo)
  25. Marshall 3210 Mosfet head. Can't turn off the boost channel.
  26. Roland Bolt-60 reconditioning
  27. 71 Super Reverb Slow To Engage Vibrato
  28. Davis Model 405 Schematic
  29. Marshall VBA 400 repair
  30. Testing Reverb tank
  31. Mesa Lonestar Special......
  32. Epiphone Pathfinder
  33. Legend R&R 50
  34. Yet another Bugera 333 XL - 212 fuse blows at power up
  35. Fender Deluxe 112 Plus Problem
  36. 67 Ampeg Reverberocket 2 Cap job help
  37. Capacitor voltage question Musicman HD120 2KV cap!
  38. Peavey Special 130 not powering on
  39. Marshall Valvestate vs100 reverb not working, here s what I tried
  40. Lifting Board For Component Replacement. 1971 Super Reverb
  41. What's wrong here? - Gibson GA5 Crestline
  42. Repost peavey 212 special with better info lead channel not working.
  43. Fixing up a Gibson Atlas
  44. Bias on Ampeg BA115 too low cause occasional random-ish noise?
  45. Reissue AC15 power tube consumption
  46. Mesa Impulse 600 No Output
  47. Fender Hot Rod Deville - Octave distortion effect on More Drive
  48. Mesa 2ch Recto no signal through input.
  49. I need a couple of good 6SL7's
  50. Randall RG50TC Biasing
  51. Fender Bassman 200
  52. 6X4WA instead of 6X4?
  53. Pointy EL34's ?
  54. No Trouble Found
  55. Rivera Clubster 45 noisy
  56. Power transformer installation.
  57. Line 6 Spider 4 Preset pot value.
  58. Components selection guide. I have found a very useful tool for everyone. Enjoy!!!
  59. Gibson GA-15 RVT Feedback / Howling
  60. Sovtek Midget troubleshooting
  61. Bias to high
  62. PT wiring question
  63. Mojotone MOSFET switching board causing Buzz
  64. Glass diode rectifier? Silvertone stereo console question
  65. Pre-Freyette VHT 50CL - Power supply burned up. Need gut shot to repair
  66. Unhooked the transformer long ago, not sure how it goes back, pics
  67. Here's an easy circuit, with hopefully a simple diagnosis, but I'm still new at this.
  68. Bassman AA864 Question
  69. Checking bias after transistor sub
  70. Peavey 212 special lead section no light no sound
  71. Looking too build a 100watt bass amp what one Fender Peavey ?
  72. Marshall DSL 40C - clean channel dropping volume once amp is heated
  73. Hiwatt experts please chime in...Mark Huss ?
  74. Marshall 2555 Silver Jubilee build
  75. Fender Champ XD No Output
  76. LANEY VC30 annoying noise
  77. Marshall VS100 combo noise
  78. 1989 Marshall JCM 800 2204 low volume problem
  79. Roland Blues Cube BC-60 - v low output
  80. Here's a twist
  81. True Confessional
  82. Bassman 300 boat anchor
  83. bf vibrochamp circuit with low low output
  84. Ampeg B-100R pilot light
  85. Low voltages under load from PSU equal bad PT?
  86. VHT Lead 40 Blowing Internal Fuses
  87. Randall RG 235 DS schematics ??
  88. Bogen J330 Mic Input Problem
  89. Scratchy POST VOLUME pot Peavey Combo 115
  90. 1954 Bogen VP17X Bass Control
  91. Another day, another dead acoustic pickup
  92. Harmony H306a low output volume
  93. Eden WT-800 Bridged Mono oscillation
  94. Sunn Model T reissue squealing
  95. Marshall JCM900 - 5881 version is too bright
  96. Marshall JCM800 Lead (2205) VERY HI HUM---HELP!
  97. FMC authorized repair
  98. Measuring output power
  99. Sinmarc power transfomer R2280 replacement needed
  100. Polytone problem...
  101. Shure Pro Master 700 Mixer - Need Advise Please
  102. Gibson GA5t Crestline voltage question
  103. Mis-branded Fender parts.
  104. Ampeg V4 questions on cap value
  105. Sunn Model T reissue thudding
  106. Peavey CS800X 50 watts per side max?
  107. Who knows acoustic pickups?
  108. Gibson GA 5t whitepanel making crackle, pop, fizz
  109. Reverb Oscillation
  110. Standel preamp module
  111. Kustom IV Bass Head Schematics?
  112. 6L6GC, wired one-pin off CW kills bias probe
  113. amp help
  114. Ampeg B2 head scratcher
  115. Deluxe reverb RI blowing fuses only occasionally
  116. fender passport 250 circuit diagram
  117. Carvin R600 Output relay problem
  118. Ampeg V4 Standby Problem
  119. Please Help with a difficult Ampeg SVT PRO 4 repair
  120. Yorkville NX750P
  121. Deluxe Reverb RI. power trans have thermal fuse?
  122. Rusted on Fender Deluxe Reverb knobs
  123. SF Twin Reverb with VERY microphonic V2 stage w/Norm & Vib Vol's CCW
  124. MAC 4C A52 (schematic could really help..)
  125. Power tranny specifications - need help
  126. Noisey pre-amp in an old SS bass head. I need ideas.
  127. Peavey eddie van halen amp.
  128. JCM900-4100 OT connundrum
  129. Behringer GMX110
  130. Carlsbro Viper 100 Bass Amp
  131. What brand of Solder and heatsink grease do you buy?
  132. Ashdown MAG 250 - blowing fuses
  133. cheap speakers
  134. odd turn off noise - Fender Princeton Chorus - links to Youtube
  135. Low freq. excess in Fender Frontman 25r
  136. How do I connect a variac?
  137. Output tranny ID please
  138. Safety: testing Electrical outlets
  139. General question concerning reel to reels
  140. GT120 project that needs a helping hand
  141. Fixed ticking vibrato in 71 Deluxe Reverb using old tube
  142. Marhsall 1962 Bluesbreaker reissue - low power problem
  143. Orange Thunderverb 200 bias current
  144. Can one bypass a PS choke for the purpose of troubleshooting?
  145. Marshall MG15 Hums on Gain Channel
  146. Fender Super 210 Red Knob - Channel Switching Problem
  147. Univox U1011: couple questions
  148. Help with Envoy 110 please!
  149. vt60 making noise
  150. Farfisa TR-70 OS high pitch problem
  151. SWR 750 blowing output transistors
  152. behringer GMX212 footswitch issue
  153. Valve Jr Fried?
  154. Did I Kill the DC Regulated Power Supply?
  155. Problem with microphonic tubes that are brand new.
  156. Fender Twin & Deluxe Reverb Input Jacks....horrible part!
  157. Merry Christmas
  158. Metty Christmas
  159. Valvestate output boards
  160. Ibanez Thermion
  161. Marshall DSL401 - no FX loop
  162. Crate VC-3112 Re-Cap Question
  163. Marshall 6100 all levels "slow" starup
  164. Blues deluxe--issues
  165. Fender Frontman 212R Distortion
  166. B-52 ATX100 Transformer
  167. Kustom K100-2 Pre-amp transistors
  168. I hate keyboards
  169. Help with Sound City B150 feedback circuit
  170. Fender Princeton '65 Bias (?) Problem
  171. JCM 600 wackiness...??
  172. PCB Trace width on Power Circuits in Ampeg SVT VR & CL amps
  173. SWR 400 Strange Humming/cutting out
  174. Marshall amp hum
  175. Tube socket wiring diagram
  176. Ampeg BT 15 bias transistor
  177. Bugera 1990 Channel Switching Problem
  178. kam kk400 amplifier..
  179. Fender Hot Rod Deluxe : instability when in More Drive mode
  180. Mesa Transatlantic
  181. Roland KC 60 amp
  182. Behringer GMX 212 Help
  183. SVT-CL - Ticking
  184. 7581 Tubes
  185. Behringer BX3000T Schematic?
  186. Traynor YBA-3 - not very loud, bias testing
  187. Peavey Classic 30 Not Switching Channels
  188. Roland Jazz Chorus JC-120
  189. Engl E530 Gain pot problem
  190. Mesa Mark 1 strange resistor lead
  191. Old Gibson Amp
  192. Teac A-3440 recorder
  193. This sounds dumb, but....need help identifying a resistor value.
  194. behringer pmp2000 blowing fuse
  195. Odd Distortion Noise
  196. Mesa Dual Recfifier 3-Ch Solo Head, Ch 1 Oacillation problems
  197. Snap or pop followed by momentary loss of volume
  198. Ampeg B-100 problems
  199. Mesa Dual Rectifier 3-Ch Solo wth LF oscillation from 5U4GB's (SS Mode)
  200. TOA D3 Mixer - "Clip" lights stuck on
  201. Why do some Fender Amps pop and others don't during Standby switching?
  202. Hoffman DR AB763 : Low b+, no sound, loud hum, etc...
  203. Another Hot Rod Deluxe Oscillation distortion
  204. Marshall JCM2000 DSL 401 Volume Problem
  205. Mesa Subway Rocket Low Volume
  206. Bassman Plate Voltages
  207. Mesa Boogie F100 Output Issue
  208. Trace Elliot BLX80...issues :(
  209. Silly Fender Schematic Question
  210. Johnson Millennium 150 and computerized amp thoughts
  211. Sovek Mig 50 making static noise
  212. Randall RG200 help, please
  213. Fender Pro Reverb, Reverb hum and hiss (Pro Tube Series 2001)
  214. Marshall encoder
  215. Super Reverb- reverb hum
  216. Variation of Fender ticking Tremolo suppression
  217. Metroamp 50w kit - problem
  218. Marshall JCM2000. Will a TSL board work in a DSL.
  219. Legend A30 Output section problem
  220. 3 prong on ancient record player?
  221. Axial Lead Electrolytics
  222. Bad Hot Rod Deluxe output trans?
  223. Will Fender LDR Optocoupler Work in Magnatone Amp?
  224. What is the weirdest repair you had to do
  225. Kustom Quad 200HD
  226. A few questions about Carbon Comp (R)
  227. Fender automatic bias
  228. Ampeg B200R Bass Amp
  229. Mesa Blue Angel slightly down on power
  230. Quick question about virtual heater CT
  231. Ampeg SVT-CL Direct Out broken/Noise off standby
  232. Sunn Solos 2 solid state
  233. Twin Reverb crackling/static noise help
  234. Hartke HA 5500 switches off
  235. Hot Rod Deluxe - Help diagnosing problem would be much appreciated
  236. Odd field coil circuit
  237. crackling in amp?
  238. Fender BF 1965 Super Reverb Buzz (with no tubes installed)
  239. How do your remove screws that have thread lock compound applied?
  240. Fender PA100
  241. Transformers; identifying which turn is shoted
  242. Gibson GA 8 Gibsonette oscillation/squeal
  243. Line 6 Spider HD100 MkII
  244. On Semi EOL notice
  245. Old Acoustic Control 370 issues
  246. Early Ampeg V4: breaks up around 3 and now won't turn on
  247. Orange AD30TC - Weird "Ghost Notes"
  248. What power transformer do I need?
  249. Fender Hot Rod Deluxe - Fuse type fast or slow
  250. Layout file for GK 800RB power board??