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View Full Version : Maintenance, Troubleshooting & Repair



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  1. SJ68568 to-3 output x-istor
  2. Filament balance pot
  3. JCM900 running real hot!
  4. Valve Fuse keeps blowing on my sovtek - need help
  5. Fender 125W Princeton Chorus w/Loud Buzz
  6. Red plating Vox AC
  7. Desperately seeking schem and photo of Guild 99J amp
  8. Need help with Fender Stage 100
  9. popping sound
  10. SS Ampeg B100 schematic?
  11. HIWATT vs. SUNN
  12. Eurodesk MX3282A schematic
  13. Danelectro DS100 schematic?
  14. Vox 4120 or 7120 schematics
  15. too much crosstalk??
  16. Carvin bridge rectifier
  17. "Broken" Musicmaster Bass amp question...
  18. Organ Amp
  19. twin reverb doesnt turn on
  20. Marshall 275 AVT Problem
  21. Ever do this?
  22. 70's silverface Twin Reverb squealing
  23. Pilot light bulb equivalents?
  24. Fender M80 : distortion
  25. 6G16 Vibroverb vibrato problem - red plating tubes!
  26. Hiwatt Lead 50R no quiscient current
  27. Bad L-Pad SWR?
  28. Issues with my Fender Stage 160
  29. Lost my Impedance Selector Switch
  30. Hiwatt Lead 50R cannot remove chassis!
  31. Transformer Troubleshooting
  32. Marshall Valvestate 8040 sound dies
  33. 5150 combo - New GT-6L6C Power Tubes
  34. Schematic For Marshall MG 250?
  35. 5150 combo standby led stays off
  36. Old Fender Twin Buzz in Reverb
  37. How do you install Transistors
  38. fender red knob "the twin"
  39. Problems With Ampeg Svt2 Pro
  40. Fender Stage 160 problems
  41. Reverb on a 1982 Musicman 112RD50 not working
  42. Marshall Silver Jubilee switching issues
  43. SWR Studio 220 - dead
  44. Ampwares
  45. Fender stage 100 DSP Head need help
  46. using coax cable or input
  47. Cap Job
  48. Boogie MarkIIB going sour
  49. Vibrosonic Reverb Vibrato Problem
  50. PING: Enzo
  51. Vox AD15VT, Pwr amp works but now sound from input
  52. Crate XT120R "high" pot problem
  53. Maestro Phase shifter - Splat sounds
  54. Strange power section problem
  55. Hiss in BF Bassman build
  56. Traynor YGM3 distorted reverb
  57. Peavey Classic VT 212
  58. Bass amp crackling noise
  59. Peavey XR 600B no power to front panel
  60. Blackface Fender Twin rattle
  61. Buying an Oscilloscope
  62. Crate BX-15 Dead
  63. Laney VC30 Low volume problem
  64. Where to buy PCB-mount pots?
  65. Crate BX-2115 schematic
  66. Yorkville XS800H (hiss) need advice
  67. Peavey Delta Blues 210, tremalo won't cut off.
  68. Screwed up!
  69. blues deluxe problem
  70. budda Super Distortion 30/Ring Modulator
  71. Peavey Delta Blues: Weak Vibrato
  72. jtm60 output transformer
  73. Traynor Ygm-3 Broken - Need Help!
  74. Ghost in the 18 watt
  75. Mu-tron Biphase - no effect
  76. SF Bassman - unwanted distortion
  77. Peavey Express 112 schematics
  78. quick smt question
  79. low volume on vibrato channel
  80. ID this switch for a Mutron AutoWah w/photo
  81. Hickok 532 Tube Tester--How to test 6BQ5, etc.
  82. GK1001rb Schematic Wanted
  83. Bias circuit problems...
  84. Swr 350
  85. Wierd hum in Peavey Transformer
  86. Marshall 8040 (V40) problem
  87. chassis and head dimensions ?
  88. Vibro-Champ Help
  89. Ampeg vt40 combo old enough to smoke
  90. Capacitor substitutes?
  91. Fuse popping...
  92. why put 150R on cathodes a Bandmaster Reverb
  93. My 66 bassman is cutting out intermittently and is making a blip blip blip noise?
  94. fender hotrod deville 212 trouble! (no power)
  95. Emc S300
  96. Polytone Mini 12L ICs...
  97. Peavey Century 120 Bass Head Help
  98. Gibson GA18T blowing fuses
  99. GRO100 Intermitant Fuse Blowing
  100. George L Cables
  101. 5E3 tone mods
  102. Noisy Ampeg SVP preamp hummmmmm~
  103. Deluxe Reverb Microphonic?
  104. Is this a symptom of a blown OT?
  105. AMPWARES - anyone know where they went
  106. Peavey Decade schematic
  107. Solid State amp not working-Help!
  108. Quick circuit testing question...
  109. Volume loss in MVA 500
  110. Scratchy gain pot
  111. Ibanez Starfield VT-100
  112. TSL100 Woes: PT2
  113. Lab Series compressor
  114. resistive load to tests?
  115. fuse flows
  116. lound crackling sound on clean channel
  117. Need Help! Channels Switching Automatically?
  118. Ampeg V4BH
  119. Links to Vox schematics
  120. Preamp positions for DSL and TSL
  121. Epiphone Blues Custom = Dead?
  122. Testing Capacitors
  123. marshall lead 12 3005 no crunch
  124. Hum increase with modded EV Jr.?
  125. Marshall DSL 100 - Nothing!
  126. TSL100- V6 not firing up!
  127. 1966 Ampeg Gemini V - low output and horrifying distorted sound
  128. Peavey Bandit 112 low volume
  129. Troubleshooting an RE-201 reverb unit
  130. How well do tube testers work?
  131. Biasing a Crate VC50
  132. Looking for SWR Strawberry/California Blond II Schematics
  133. peavey cs 800 wiring
  134. Valvestate 8080 Low gain on Boost Channel
  135. Replacing speaker in Rickenbacker 2x15?!
  136. Schematic for a Regal R-1160 tube amp
  137. Mashall Valvestate 8080 Issues
  138. fizzy static through AC30 TB
  139. Baldwin C1 problem...the one with the colorful push-buttons
  140. Fender Deville - Same Issue, New Question
  141. Amp cabinet rattle
  142. im getting shocked!!!
  143. transistor matching question
  144. Classic 20 repair manual
  145. Silvertone 1448 Transformer questions
  146. Peavey mace no output
  147. Classic 30 blowing fuses...
  148. Mesa Boogie reverb madness
  149. Bad sound out of my 1964 Princeton
  150. Ampeg b12xt
  151. Noisy Traynor TR-2 reverb tank
  152. JCM900 - urgent advice needed
  153. Counterfeit pwr x-istors
  154. 2uf 25v Caps
  155. JMP-1 Midi Trouble
  156. Mesa Dual recto Questions
  157. Schematic for a Guild Thunderstar Bass Amp 1969... Please..
  158. standby light stays on
  159. 16/32uF 475v Caps?
  160. Sovtek mig 50 issues ?
  161. low frequency buzz from speaker
  162. SF Champ lost headroom
  163. SWR Workingman's 10 and TDA7293
  164. Ampeg SVT-4 schematic anyone?
  165. Ampeg transistor?
  166. Fender Princeton 65 DSP Problems ???
  167. What would you do with a CBS 70w Super Reverb?
  168. a bunch of hiss in preamp
  169. Fender HR Deville Issue
  170. SPDT channel switch pops
  171. Jumpy master volume
  172. Valvestate 8280 shorting problems, need troubleshooting help
  173. Chorus weirdness.....
  174. could someone help me out?
  175. Improving Halfwave Rectifier Question
  176. OT transformer feeding back
  177. jcm800 clone with noise
  178. dirty dusty amp chassis and circuit.
  179. Help debugging my mesa boogie studio preamp
  180. Marshall VS100 Combo Cutting out after a few minutes
  181. Kalamazoo Model One failure...
  182. Peavey Butcher dead
  183. Valve Junior-intermittent cutting out
  184. Messy bogie DC3
  185. Fender Bass Amp Blues
  186. quickest/easiest way to test zeners?
  187. Silvertone 1466 schematic?
  188. Ideas on '67 Bassman problem......
  189. Peavey Deuce schematic?
  190. Roland Cube60
  191. Laney Pro Tube 50 (lead) schematic
  192. Fender deluxe 90 prob....any fender techs?
  193. Rewiring US Marshall for Europe
  194. Scorpion Lead Amp - Cap Replacement
  195. what is the fuse value for the mode four (mf350)
  196. Marshall JCM2000 TSL100 Noise Issue
  197. valvestate 8080 reverb
  198. Output Transformer Question
  199. Peavey
  200. Marshall mg100dfx resistor value r8 & r20
  201. marshall VS265 - high pitched noised at high volumes
  202. Peavey Studio Chorus 210
  203. Fender Deville cathode diode
  204. Filter cap question
  205. Winged C SVEL34
  206. testing transistor temp sensitivity
  207. Marshall MF350 Mode Four - No power up
  208. location of 3rd wire
  209. Spray painted Gril Cloth
  210. Dead Marshall MG100
  211. Kustom K200B-4 hisssssssss
  212. Ampeg B15 oscillations at high volume
  213. Peavey Butcher 6l6 to El84
  214. Plate voltage w/ tubes in
  215. output transformer wiring
  216. replacing power cord strain relief
  217. Peavey PA-400 schematic
  218. Ampeg GV-22 1968 vintage restoration
  219. TNT-100 Repair Problem 2
  220. Marshall VS100 blowing fuses
  221. Hartke HA-3500 Troubleshooting - Bass Amp Crackles & Pops
  222. dummy math question capacitance
  223. Stage 112 cuts in and out
  224. Orange Rocker 30 Schematic
  225. Blowing Fuses
  226. Carvin PB 150 FETs
  227. JCM 900 problems
  228. hiss from output/power amp
  229. Old Elk Viking Amp Head Scratcher
  230. Carvin Legacy help needed
  231. Peavey Classic 30/Smack it to power up
  232. Marshall VS65R Problem
  233. Powering up with a variac
  234. question about bias cap values?
  235. Genz Benz: red or black?
  236. bias caps: Sprague Atom or Xicon?
  237. Vibrato LDR
  238. Pic of turntable stand
  239. Transformerless Amp Safety
  240. Mesa Boogie Lone Star Hum Please Help
  241. crate vc5310 problem
  242. peavey classic 50 410-poping,cracking
  243. PI anode resistors
  244. Marshall TSL-601 - Quiet Volume
  245. Mesa Mark IV schematic help
  246. Bad Choke?
  247. Ampeg SVT6PRO question
  248. Marshall Valvestate reverb problem
  249. Ampeg Gemini 6 GS-15R Blowing Fuses
  250. Electrical Interference or Arcing?