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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Roland Cube 60 - Fuzzy Buzz
  2. princeton stereo chorus has bad hum...stumped!
  3. bad preamp tube creating open ground?
  4. Noisy bugera
  5. help with Laney pro tube
  6. marshall valvestate 8100 pot value help!!!!
  7. What would cause high frequency oscillation with neg feedback loop connected?
  8. Broken allen & heath board amp need help finding ec-10n20 mosfet
  9. G-K Backline 250 Head Blowing Fuses, Help Please!
  10. Fender Champ squeals
  11. Fender Pro Reverb Vibrato ticking
  12. Roland JC-120 channel 2 no work!
  13. Problem with Musicman RP-65 (2165-RP) volume.
  14. Peavey Transtube Envoy 110
  15. Ampeg M12
  16. Transformer Current Rating Help
  17. cube 60 broken lead channel
  18. Bassman export amp silverface 1970 circuit
  19. 50 watt jmp
  20. AVT150 (again, sorry)
  21. 69 Fender Princeton Reverb - Vibrato and Tone Stack Issues
  22. Peavey Classic 30 Help
  23. Laney AOR/50 100 - anyone have one ?
  24. bass amp buzzing/distorted
  25. vintage 1960 fender champ volume issue
  26. turned on amp with no PI tube...
  27. Cooked Acoustic 370
  28. Crate Palamino v32 112 Issue
  29. Torres DM200 motorboats on loud notes
  30. PeaveyTMax squeal
  31. Ampeg B15 high plate voltage?
  32. Plate voltage on Valvestate 8080 head
  33. SWR WM 4004 headphone jack resistors
  34. Fender Performer 1000
  35. Hums, ground loops, and strange squeals.
  36. Amp too "honky" !!!
  37. 65 Blackface Bassman
  38. JCM602 heater question...
  39. Ampeg ET-2 Super Echo Twin bias issues...
  40. speaker resistance for Fender Stage 160.
  41. 5F6-A ugly distortion - Direct coupling question
  42. Peavey Butcher won't come off standby
  43. Laney GH50L problems plus I saw my first power tube go down in electrical fury
  44. Ampeg r-12-r-b motorboating
  45. sano low volume
  46. Hartke 3500 EQ Board
  47. Kustom 36' Coupe bias
  48. 60's Gibson Hawk
  49. Blues Deville reissue tone control acts like bass control in reverse
  50. One day mg100hdfx the next nothing...help!?!
  51. Replacement output transformer for Peavey Valveking
  52. SWR 550X- Constant hum issue
  53. Ramdom poping sound
  54. AB763/6G16 Circuitry
  55. Polytone minibrute iv noise
  56. Marshall JMP-1 Tube Preamp Burning Resistors
  57. Peavey Ultra Plus 120W Tube Amp No sound output
  58. EL84 Bias Values, crackling, etc....
  59. 20 amp fuses?
  60. Quieting a noisy fan?
  61. Fender 212r again
  62. Mesa Boogie Heartbreaker popping issue
  63. 7591 Bias
  64. S30-A Bremia Tube amp.
  65. Tech help needed. Different readings between direct plate, cathode & bias probes.
  66. Obscure Guild Maverick Amp (7591's) VERY low volume/not working.
  67. '69 bassman troubles
  68. No plate current, but why?
  69. [rebuild] SUNN A212 Combo
  70. Carvin X100B Reissue Issue
  71. fender rhodes power transistors
  72. does this sound like a bad solder?
  73. Help needed with Frontman 15G input jack replacement
  74. Mackie SRM450 tweeter replacement?
  75. biasing 1966 BFSR
  76. Solved a reverb feedback problem read on to be enlightened.
  77. sound city 50r mk 3 reverb tank
  78. Line6 AX2 Modeling Amp Emits Solid Tone When Switched On
  79. Reducing noise in Carlsbro valve PA head
  80. Fender DRRI OT replacement
  81. Two-Stroke Amp loses volume intermittently
  82. Amp Tech in Gdansk, Poland?
  83. JC 120 went Pfft!
  84. Bugera 6262 combo..here I go again
  85. Marshall Valstate 100r - No distortion
  86. Anybody have a legible TC-142 schematic?
  87. Weird amp hum
  88. Carvin Legacy 100 head arcing issue
  89. Fender Bassman SP3100 "moaning"
  90. Magnatone MP1 help
  91. Peavey Triumph 60 Effects Loop noise
  92. Preamp negative grid voltage, oscillation?
  93. Laney Klipp 60
  94. Kustom PA 300 DC on output and lots of it!!!
  95. Fender Musicmaster Bass amp fuse holder
  96. Vox AC30 reverb model with loud hum(strange AC30 problems revisited)
  97. Fender roc pro 1000
  98. Peavey CS-400
  99. Ampeg V4 distortion model
  100. V-amp problem
  101. SWR Workingman 300
  102. Marshall JCM2000-60W: Serious damage from whiskey spill!
  103. Is this cap cooked?
  104. Soundtronics Custom300 7027 screen resistors?
  105. Please help me troubleshoot my Roland JC-160!
  106. Wierd Blues Jr problem-helps
  107. 5150 combo keeps blowing fuses
  108. gibson g20 troubleshooting help
  109. Marshall JCM 2000 DSL
  110. VOX AD100 motorboating / machine gun sound out of nowhere...
  111. Pictures of wiring, ab763 reverb parts
  112. peavey triple x head problem with effects loop
  113. Power transformer--how hot is too hot?
  114. Makeshift rig - buzzing
  115. GK 800RB Mystery
  116. Princeton Reverb tremolo broken, everything else works great
  117. SWR Bass 350 Capacitor rating?
  118. Pro Reverb questions:
  119. Super Reverb vibrato thumping, channel interaction
  120. amp cuts in and out
  121. the ol' hot rod deville...more drive not functioning
  122. Vintage Ampeg blowing fuses, indicator lights on dim when amp is off...
  123. Peavey Stereo Chorus 212
  124. Gibson Atlas 3gang pot wiring
  125. Harke HA4000 no sound just a very low distorted sound, What could it be the problem?
  126. Fuse blows for no reason?
  127. Silvertone 1449 help.
  128. Kustom k-200B - 4 No Output
  129. Is this Output Transformer Shot...?
  130. 7591 glowing screen on Panaramic (Magnatone/Audio Guild)
  131. 1973 super NO reverb
  132. Power transformer gets very hot after one minute idle
  133. I Learned Something Today
  134. Ampeg R212R Reverberocket
  135. Rectifier tube/Power tubes causing fuse to blow?
  136. Mesa Boogie Studio Caliber DC-2 Recording out noisy, any ideas on how to improve it?
  137. possible water damadge to a new traynor ycv40wr
  138. Fender Twin preamp fuzzing/crossover distortion
  139. JCM 800- neg voltage too negative
  140. KMD XV100SD Head Produces "Static Crescendo"/Popping
  141. Marshall amp has halfed its ouput volume
  142. Marshall 6100 LM blows fuses after tube swap! Help!
  143. Eden wt 400 issues
  144. SWR SM-900 Popping
  145. Roland JC120 - Weak/Distorted Chorus and Vib output
  146. Noob would like guidance setting bias for new EL34s in a Haze 40w Combo
  147. Marshall JCM2000 bias
  148. HELP NEEDED! Hot Rod Deluxe Volume drop.
  149. Anyone willing to help a n00b replace a PT in a working 1967 Super Reverb?
  150. Draining Filter Caps - Best place to meter.
  151. Crate Power Block 150 high frequency oscillation
  152. What Happened To My Amp??????
  153. struggling to hear my self onstage , having to rely on onstage monitoring
  154. AT100 Resistor mystery?
  155. Marshall valvestate 8008
  156. Acoustic 906 Mixer/PA problem
  157. Help solving Fender Hot Rod DeVille 410 reverb problem
  158. Need help replacing a broken transformer
  159. Princeton (NR) has kind of soft bottom end
  160. Peavey JSX flyback diode replacement
  161. weber princeton reverb clone a bit short on power
  162. Fender Hot Rod Deville Filament Winding Problem
  163. Pots for Ampeg VL series Guitar Amps?
  164. Lead Free desoldering help!
  165. Hartke 3500 Mosfet EQ Problem
  166. Valvestate VS100 parts
  167. Peavey ValveKing 100w head/ lead ch low volume
  168. Would I have a need for a 32-3 Regulated DC Power Supply as a casual amp hobbyist?
  169. Crate GFX 212 very low distorted output
  170. sound city 120 mk iv bias
  171. Peavey 5150 (mk2) bias
  172. Chorus and Reverb dead on Marshall AS50R......
  173. Fender Hot Rod Deville problem
  174. one marshall amp fixed . problem ? crap factory workmanship
  175. transistor troubleshooting
  176. Need Help With From Someone Wth JCM2000 DSL100
  177. '90s Fender Blues Deluxe wont make sound
  178. Crate Turbo Valve 120-Loss of sound
  179. channel 1 on my 1981 ampeg V3 is only barely audible
  180. '88 Princeton Chorus Ground Hum
  181. Output Transformer Failure?
  182. Hot Rod Deluxe Channel problem
  183. Peavey Encore 65 problems
  184. Behringer GMX212 problems
  185. 6v6 cathode bias question
  186. Peavey 5150 suddenly squeals
  187. drastic volume drop on marshall avt 100
  188. Power Transformer 6.3V Secondary Center Tap....
  189. Purpose of Center Tap on Full Wave Bridge?
  190. loud hum in 135 watt Twin (UL)
  191. Input problem
  192. Fender 212R power amp blown
  193. LM3886T?
  194. Fender Deluxe 85(red knob) Low overdriven output
  195. Peavey TKO 65 distorted/low output
  196. SF Champ problem...
  197. Bassman RI troubleshooting
  198. Bugera 333 filament question
  199. X2 capacitors for Rivera amps
  200. Blues Junior Low Output
  201. Marshall JCM2000 DSL100 Blowing Up Feedback Circuit
  202. Demise of the Incandescent Lamp?
  203. Testing A Preamp
  204. Gibson GA5-T Skaylark Capacitor blew up
  205. Marshall AVT 100 TDA7293 chip
  206. Ace Peppers P-Matic - slight amount of hiss
  207. 77 twin reverb
  208. Marshall TSL122 sudden volumedrop
  209. Ampeg V4 filament problem
  210. add bias pot to 1988 Carvin X100B EL34
  211. Fender Roc Pro 1000 Channel Switch issue
  212. Peavey Classic 50 lead channel volume drop
  213. New tube in Marshall VS100
  214. Black Face Deluxe Reverb noise issue
  215. all tubes light up but rectifier- Drz Z-28
  216. Arcing Issue
  217. Have four mackie hd1531 powerd speakers all with the same issues, need some help
  218. Wiring a Fender style lamp with 110v, dropping resistor 100k ??
  219. Schematic for 96 Marshall VS100
  220. Epiphone Valve Senior Combo problem
  221. Fender Reverb Head Scratcher
  222. Regal Music amp
  223. Epiphone Galaxie makes buzzing noise
  224. Not Enough Bias Voltage?
  225. '65 TRRI squeals when input is unplugged
  226. Learning the hard way not to take shortcuts
  227. problems with 15 volt power supply in Eden amp
  228. Resistor value question
  229. Grainy/Trashy noise on tube amp
  230. Peavey 6 pin din replacement help
  231. replacement speaker for polytone mini bruteII
  232. Red hot coil in the centre of 6P14P-EV
  233. Best 1/4 Inch Input Jack
  234. Peavey 400BH
  235. Matchless Clubman oscillation
  236. Polytone Mini-Brute I hums
  237. GS15r ampeg gemini reverb out
  238. 18 watt Brownote
  239. Capacitor Voltage rating Question
  240. Problem with new build (dark sounding)
  241. Somebody set up bias on a princeton reverb ri??
  242. Fender Super60 + HARLEY BENTON G412A VINTAGE
  243. SELMER TV6 troubles
  244. fender blues jr problem
  245. Crate BV6212 "Self-Biasing"
  246. Customer of the Month
  247. Problem with excessive current draw
  248. ticking 5F1
  249. Humming Univox U 155
  250. Bias on a Carlsbro 50TOP Evo