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View Full Version : Maintenance, Troubleshooting & Repair



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  1. another Hartke Overheating Post
  2. Laney AOR 100w first series, 505 volts on the plates ?
  3. jtm30 bias mod problem
  4. Marshall VS100 combo - occassional overpowering buzz
  5. Fender Transformer Problem
  6. Music man 2275-65 ss phase inverter issue?
  7. Ampeg SVT II Pro - help needed
  8. Ampex ATR-700 trim pot
  9. marshall 8080 low level hum
  10. Reverb tank for Kustom 50
  11. Marshall JCM 900 4100 Fading
  12. I can't fix anything for finding more stuff
  13. 5150 Power board problem
  14. hartke LH1000
  15. Massive hum - B-15N
  16. Super Reverb cooks Reverb Driver 12AT7
  17. Laney amp problem
  18. Sunn 300T replacement pot?
  19. Acoustic 470 Guitar/Bass amp
  20. Dead PT
  21. Why does the Pro Jr sound so much thinner than a Princeton Reverb ?
  22. Twin Reverb 15 Popping/crackling on startup
  23. Peavey XXL cutting in/out
  24. SWR LA15 complete schematics
  25. tantalum replacement in Kustom 200
  26. Marshall MG50DFX No sound from main input
  27. On tour in Europe, need help with Sunn 300T
  28. Tube Amp Hum, No Sound
  29. Carvin R1000 Bass Amp Poroblem
  30. Help! Can't rock until this is resolved!!
  31. trying to chase and kill hum in tube echo and reverb
  32. Fender Bullet problems
  33. Rivera Knucklehead switching problems
  34. Mesa Bass 400 preamp voltages WAY too high!?
  35. Peavey session 400 (210 Watts) Capacitor Problem!
  36. Peavey Bandit loud popping
  37. Noise problems with new Vox AC100CPH Classic Plus
  38. Large Radial Caps
  39. How to measure bias in a Fender Pro Junior (1ohm resistor)
  40. another noisy Silvertone 1484
  41. Ampeg SVT-VR&CL popping intermittently
  42. Reverb Tank Suitable Replacement - Acc. Type 1 Tank
  43. Super Beatle Caps Question
  44. volume problems with a first amp build
  45. Ampeg SVT-VR&CL ground loop hum solution
  46. 5E3 kit - preamp hum
  47. Intermittent, volume independent crackle on Fender Deluxe Reverb (w/ mp3)
  48. Ampeg V7 reeverb problem
  49. 5150 Screen Grid RESISTOR/Tube question...
  50. SF Bassman 100 hum problem
  51. GK 400RB mark IV
  52. Fender Prosonic SERVICE Manual / Components List sought
  53. Using a variac
  54. EH EL34 heater-cathode leakage
  55. Randal RG200 G3
  56. Rickenbacker TR35B amplifier
  57. Rhodes Suitcase Dual 50W amp
  58. Help, Road King Clean Channel volume drop after oscilloscope method tube check
  59. Peavey Mace Question
  60. Static - Bad OT?
  61. HiWatt DR103 problem
  62. Problems with a new Fender BandMaster V Series! Uggh!
  63. Harsh sounding high notes (first tube preamp)
  64. Randall RG200 G3 Low power
  65. Screen resistor voltage drop
  66. Marshal Valvestate Model 8100 Trouble
  67. crate-gx212 problem need help
  68. Ampeg b-100 problem
  69. Peavey 600F mixer amp problem
  70. Peavey mace
  71. Hot Rod Deville.. please help!
  72. Parts Salvage Question
  73. Bassman AB165 midrange hiss
  74. Shorted Reverb Tank Causes Distortion
  75. regulated AC PSU
  76. Hotrod Deluxe Problem
  77. Wurlitzer 200 Power transistors.
  78. Sunn Model A
  79. Dr. Z kt-45 question
  80. Peavey C30: noise forever ?
  81. TDA7293 replacement in an AVT150
  82. Anyone got a schematic for a Crate TV-6212?
  83. Help and ideas for repairs to Ampeg B2r
  84. Refurbishing a Peavey KB60
  85. Optical pedal repair
  86. RI 65 Twin Reverb with excessive feedback
  87. Strange coupling capacitor problem
  88. peavey tko 115 bass amp circuit
  89. Soldering question
  90. QSC mx2000a
  91. Music Man HD 212
  92. Ashdown MAG600 volume?
  93. VYPYR 30 -No Input audio...
  94. Fender Deluxe Reverb 65, swapped 6v6 and rectifier tube by mistake
  95. When to start repair.
  96. Peavey Special 130 blowing fuses
  97. crate bfx100 blows fuses - possible dc in output
  98. peavey kb100
  99. Help with questions to ask Amp Tech & request list
  100. Help Me Solve This Power Amp Riddle
  101. Throw out bad speakers?
  102. Bassman 10 (70?) PT question
  103. Peavey Renown , howling
  104. SWR SM 400 left channel distorted
  105. volume drop when negative feedback is doisconnected
  106. AVT-50 hum
  107. Morley PFL xformers
  108. New Pot for Fender Blues Deluxe?
  109. Weird DSL +/- 15v supply problem.
  110. Twin Reverb Problems
  111. Boogie Mark I reissue intermittent
  112. AAARRRRGGGHHH! 5150 Question(s)!
  113. 5E3 low feedback/oscillation, stumped???
  114. crackling sound in tube amp
  115. Garnet Mach 5 from 1969
  116. growing bias
  117. Valves for Ashdown FA 60 DSP Head
  118. Problems with a Peavey Classic VTX 65 watt amp.
  119. impedence rule of thumb?
  120. Electrolytics for signal path restoration?
  121. Unplugged speaker protection & line out
  122. dying Mesa nomad 100
  123. Marshall JTM 60 filter cap problem
  124. Marshall VS100 - high pitched squeel
  125. Marshall SL100 Bass Knob Not working
  126. Vox DA15 problem
  127. '76 Princeton Reverb reverb tone/level mod?
  128. Peavey Audition CHORUS request
  129. peavey bandit 112 II
  130. Epiphone Blues Custom Rectifier prob
  131. Ampeg GU-12 tremolo problem
  132. 1978 Marshall
  133. Qsc mx2000a
  134. Ampeg svt classic help
  135. Dual Showman low freq oscillation
  136. Sessionette:75 - Celestion G12-80 dead?
  137. Marshall MG50DFX Blown fuse
  138. Capacitor rated in watts
  139. AMPEG SVT 3 Pro
  140. Need help with my burn Boss-Ch1
  141. AC filiments with one side grounded
  142. no tone no top superlead
  143. Pro-Reverb scratchy vol & bass pots
  144. White Amplification Little Rock
  145. Marshall MG100DFX Unusually Low Volume
  146. Bugera 333 XL 212 gives an extra buzz-sound
  147. Toa D-3 what is Q507?
  148. combo amp speaker question
  149. Power Transformer oddity
  150. my dad wrecked my amp
  151. DeVille no Reverb
  152. diode manufacturers?
  153. Silverface MV Twin Hums On Reverb Channel
  154. Acoustic 470 Repair Issue
  155. Ampeg SVT-3 Pro -- Smoking Toroidal
  156. Goofy Gibson Amp
  157. Guitar Research T60R Zener Diode values
  158. M-80 fade out
  159. Speaker cabinet impedance question
  160. Curious thing on bottom of Ampeg VT-22 cabinet...
  161. Problem with 2003 Marshall JCM 2000 TSL100
  162. Hartke 3500 BJT
  163. AD15 no sound
  164. Marshall 5002 Lead 20 Gut Pic !! - Tech Advice -
  165. Vox Royal Guardsman 1131 problem
  166. blues deluxe reissue problem
  167. AVT-150 repair thread
  168. Older Epiphone amp
  169. Trying to find VOX part
  170. Ampeg BA-115 Crackle/static
  171. MG30dfx headphone jack
  172. 71' Marshall super lead, Replace capacitors?
  173. Peavey Heritage VTX
  174. Problem with my Fender Hot Rod Deluxe
  175. dying amp
  176. Peavey Data Bass
  177. DSL 50 no sound...help
  178. Yamaha EMX660
  179. Help!! Bad Speakers Killed My Amp?
  180. '71 Fender Deluxe reverb Vibrato question
  181. Balanced triodes in PI of Peavey VK's, is it of any use?
  182. Help w Volcano hot EL34 on Music Man 210HD 130
  183. JCM2000 DSL 50 low volume
  184. '71 Fender Deluxe reverb question.
  185. Kitty Hawk preamp repair driving me nuts!!!
  186. Speaker Cab Impedance Question
  187. bug dissected
  188. DSL Hum on Lead Channel
  189. Help: External speaker jack on drri, dead
  190. Gorilla amps: Info on a 10-watter
  191. troubleshooting an Ampeg VH-140C
  192. Deep fried Mc Gretsch! model 7885
  193. Troubleshooting tremolo on a Twin Reverb
  194. Old Fender Blues Deluxe
  195. Got a jvm410 H in and it makes an awful hum on od1 and od2 channels
  196. SFdeluxe with no tremolo
  197. Calculation for heater current
  198. tsl122 pc board
  199. Microphonic tube vs. fillament rattle
  200. Marshall footswitch
  201. GK800RB & Phantom power
  202. Hartke 3500A fault
  203. Ampeg VT-60 bias issue
  204. TSL Clean Channel Buzz
  205. Marshall 1987S Hiss/Hum Problems
  206. "Dorothy, the Evil Twin Is Dead!"
  207. Fender FM 65
  208. Peavey Classic 50 help
  209. Ampeg SVT 4 Pro Board Layout diagram
  210. B-52 At-100 Transformer
  211. Hafler P225 amp has goofy problem
  212. SWR W/M15 Combo hot component
  213. newtronics signal generator
  214. The heater cable toasted
  215. Powered speaker schematic needed
  216. Blues Junior ribbon wiring change
  217. No sound from Marshall MG50dfx
  218. Trouble with my Peavey Classic 30...suggestions?
  219. Sovtek blowing fuses
  220. Marshall Footswitch Conversion Possible?
  221. Marshall MG100hdfx Problem
  222. My VJR Voxy build didn't work, help?
  223. Stupid mistake on my Ampeg B-25
  224. BF Princton Reverb PT Question
  225. Mesa boogie mk iv gone silent!!
  226. crackling sound on my SF super reverb
  227. Silvertone OT
  228. Marshall problem
  229. Fender Acoustasonic Junior - What is wrong with my spring reverb?
  230. Dynacord Eminent I
  231. Another B-25 Question
  232. Benchtop smoke absorber?
  233. Good place to buy parts?
  234. Tektronix 475 Oscilloscope
  235. MARSHALL AVT 150H sometimes works
  236. Grundig tone circuit
  237. 7027A's
  238. Hartke 3500 MOSFET output transistor
  239. Fender FM 212r low level hum
  240. new motherboard for dsl still not working
  241. Tubes warm but not hot?
  242. Mesa M-Pulse 600 BIAS
  243. Ampeg B-25
  244. SWR Workingman's 15 - weird crackle
  245. Ampeg SVT 3 PRO crackling and popping
  246. SOLDANO designed amp/Yamaha
  247. Fender Deville with slight oscillation/flange sound
  248. fender concert 81, clean gets dirty after on awhile
  249. Yamaha T100C
  250. crate rfx120 hum