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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Organ Amp
  2. twin reverb doesnt turn on
  3. Marshall 275 AVT Problem
  4. Ever do this?
  5. 70's silverface Twin Reverb squealing
  6. Pilot light bulb equivalents?
  7. Fender M80 : distortion
  8. 6G16 Vibroverb vibrato problem - red plating tubes!
  9. Hiwatt Lead 50R no quiscient current
  10. Bad L-Pad SWR?
  11. Issues with my Fender Stage 160
  12. Lost my Impedance Selector Switch
  13. Hiwatt Lead 50R cannot remove chassis!
  14. Transformer Troubleshooting
  15. Marshall Valvestate 8040 sound dies
  16. 5150 combo - New GT-6L6C Power Tubes
  17. Schematic For Marshall MG 250?
  18. 5150 combo standby led stays off
  19. Old Fender Twin Buzz in Reverb
  20. How do you install Transistors
  21. fender red knob "the twin"
  22. Problems With Ampeg Svt2 Pro
  23. Fender Stage 160 problems
  24. Reverb on a 1982 Musicman 112RD50 not working
  25. Marshall Silver Jubilee switching issues
  26. SWR Studio 220 - dead
  27. Ampwares
  28. Fender stage 100 DSP Head need help
  29. using coax cable or input
  30. Cap Job
  31. Boogie MarkIIB going sour
  32. Vibrosonic Reverb Vibrato Problem
  33. PING: Enzo
  34. Vox AD15VT, Pwr amp works but now sound from input
  35. Crate XT120R "high" pot problem
  36. Maestro Phase shifter - Splat sounds
  37. Strange power section problem
  38. Hiss in BF Bassman build
  39. Traynor YGM3 distorted reverb
  40. Peavey Classic VT 212
  41. Bass amp crackling noise
  42. Peavey XR 600B no power to front panel
  43. Blackface Fender Twin rattle
  44. Buying an Oscilloscope
  45. Crate BX-15 Dead
  46. Laney VC30 Low volume problem
  47. Where to buy PCB-mount pots?
  48. Crate BX-2115 schematic
  49. Yorkville XS800H (hiss) need advice
  50. Peavey Delta Blues 210, tremalo won't cut off.
  51. Screwed up!
  52. blues deluxe problem
  53. budda Super Distortion 30/Ring Modulator
  54. Peavey Delta Blues: Weak Vibrato
  55. jtm60 output transformer
  56. Traynor Ygm-3 Broken - Need Help!
  57. Ghost in the 18 watt
  58. Mu-tron Biphase - no effect
  59. SF Bassman - unwanted distortion
  60. Peavey Express 112 schematics
  61. quick smt question
  62. low volume on vibrato channel
  63. ID this switch for a Mutron AutoWah w/photo
  64. Hickok 532 Tube Tester--How to test 6BQ5, etc.
  65. GK1001rb Schematic Wanted
  66. Bias circuit problems...
  67. Swr 350
  68. Wierd hum in Peavey Transformer
  69. Marshall 8040 (V40) problem
  70. chassis and head dimensions ?
  71. Vibro-Champ Help
  72. Ampeg vt40 combo old enough to smoke
  73. Capacitor substitutes?
  74. Fuse popping...
  75. why put 150R on cathodes a Bandmaster Reverb
  76. My 66 bassman is cutting out intermittently and is making a blip blip blip noise?
  77. fender hotrod deville 212 trouble! (no power)
  78. Emc S300
  79. Polytone Mini 12L ICs...
  80. Peavey Century 120 Bass Head Help
  81. Gibson GA18T blowing fuses
  82. GRO100 Intermitant Fuse Blowing
  83. George L Cables
  84. 5E3 tone mods
  85. Noisy Ampeg SVP preamp hummmmmm~
  86. Deluxe Reverb Microphonic?
  87. Is this a symptom of a blown OT?
  88. AMPWARES - anyone know where they went
  89. Peavey Decade schematic
  90. Solid State amp not working-Help!
  91. Quick circuit testing question...
  92. Volume loss in MVA 500
  93. Scratchy gain pot
  94. Ibanez Starfield VT-100
  95. TSL100 Woes: PT2
  96. Lab Series compressor
  97. resistive load to tests?
  98. fuse flows
  99. lound crackling sound on clean channel
  100. Need Help! Channels Switching Automatically?
  101. Ampeg V4BH
  102. Links to Vox schematics
  103. Preamp positions for DSL and TSL
  104. Epiphone Blues Custom = Dead?
  105. Testing Capacitors
  106. marshall lead 12 3005 no crunch
  107. Hum increase with modded EV Jr.?
  108. Marshall DSL 100 - Nothing!
  109. TSL100- V6 not firing up!
  110. 1966 Ampeg Gemini V - low output and horrifying distorted sound
  111. Peavey Bandit 112 low volume
  112. Troubleshooting an RE-201 reverb unit
  113. How well do tube testers work?
  114. Biasing a Crate VC50
  115. Looking for SWR Strawberry/California Blond II Schematics
  116. peavey cs 800 wiring
  117. Valvestate 8080 Low gain on Boost Channel
  118. Replacing speaker in Rickenbacker 2x15?!
  119. Schematic for a Regal R-1160 tube amp
  120. Mashall Valvestate 8080 Issues
  121. fizzy static through AC30 TB
  122. Baldwin C1 problem...the one with the colorful push-buttons
  123. Fender Deville - Same Issue, New Question
  124. Amp cabinet rattle
  125. im getting shocked!!!
  126. transistor matching question
  127. Classic 20 repair manual
  128. Silvertone 1448 Transformer questions
  129. Peavey mace no output
  130. Classic 30 blowing fuses...
  131. Mesa Boogie reverb madness
  132. Bad sound out of my 1964 Princeton
  133. Ampeg b12xt
  134. Noisy Traynor TR-2 reverb tank
  135. JCM900 - urgent advice needed
  136. Counterfeit pwr x-istors
  137. 2uf 25v Caps
  138. JMP-1 Midi Trouble
  139. Mesa Dual recto Questions
  140. Schematic for a Guild Thunderstar Bass Amp 1969... Please..
  141. standby light stays on
  142. 16/32uF 475v Caps?
  143. Sovtek mig 50 issues ?
  144. low frequency buzz from speaker
  145. SF Champ lost headroom
  146. SWR Workingman's 10 and TDA7293
  147. Ampeg SVT-4 schematic anyone?
  148. Ampeg transistor?
  149. Fender Princeton 65 DSP Problems ???
  150. What would you do with a CBS 70w Super Reverb?
  151. a bunch of hiss in preamp
  152. Fender HR Deville Issue
  153. SPDT channel switch pops
  154. Jumpy master volume
  155. Valvestate 8280 shorting problems, need troubleshooting help
  156. Chorus weirdness.....
  157. could someone help me out?
  158. Improving Halfwave Rectifier Question
  159. OT transformer feeding back
  160. jcm800 clone with noise
  161. dirty dusty amp chassis and circuit.
  162. Help debugging my mesa boogie studio preamp
  163. Marshall VS100 Combo Cutting out after a few minutes
  164. Kalamazoo Model One failure...
  165. Peavey Butcher dead
  166. Valve Junior-intermittent cutting out
  167. Messy bogie DC3
  168. Fender Bass Amp Blues
  169. quickest/easiest way to test zeners?
  170. Silvertone 1466 schematic?
  171. Ideas on '67 Bassman problem......
  172. Peavey Deuce schematic?
  173. Roland Cube60
  174. Laney Pro Tube 50 (lead) schematic
  175. Fender deluxe 90 prob....any fender techs?
  176. Rewiring US Marshall for Europe
  177. Scorpion Lead Amp - Cap Replacement
  178. what is the fuse value for the mode four (mf350)
  179. Marshall JCM2000 TSL100 Noise Issue
  180. valvestate 8080 reverb
  181. Output Transformer Question
  182. Peavey
  183. Marshall mg100dfx resistor value r8 & r20
  184. marshall VS265 - high pitched noised at high volumes
  185. Peavey Studio Chorus 210
  186. Fender Deville cathode diode
  187. Filter cap question
  188. Winged C SVEL34
  189. testing transistor temp sensitivity
  190. Marshall MF350 Mode Four - No power up
  191. location of 3rd wire
  192. Spray painted Gril Cloth
  193. Dead Marshall MG100
  194. Kustom K200B-4 hisssssssss
  195. Ampeg B15 oscillations at high volume
  196. Peavey Butcher 6l6 to El84
  197. Plate voltage w/ tubes in
  198. output transformer wiring
  199. replacing power cord strain relief
  200. Peavey PA-400 schematic
  201. Ampeg GV-22 1968 vintage restoration
  202. TNT-100 Repair Problem 2
  203. Marshall VS100 blowing fuses
  204. Hartke HA-3500 Troubleshooting - Bass Amp Crackles & Pops
  205. dummy math question capacitance
  206. Stage 112 cuts in and out
  207. Orange Rocker 30 Schematic
  208. Blowing Fuses
  209. Carvin PB 150 FETs
  210. JCM 900 problems
  211. hiss from output/power amp
  212. Old Elk Viking Amp Head Scratcher
  213. Carvin Legacy help needed
  214. Peavey Classic 30/Smack it to power up
  215. Marshall VS65R Problem
  216. Powering up with a variac
  217. question about bias cap values?
  218. Genz Benz: red or black?
  219. bias caps: Sprague Atom or Xicon?
  220. Vibrato LDR
  221. Pic of turntable stand
  222. Transformerless Amp Safety
  223. Mesa Boogie Lone Star Hum Please Help
  224. crate vc5310 problem
  225. peavey classic 50 410-poping,cracking
  226. PI anode resistors
  227. Marshall TSL-601 - Quiet Volume
  228. Mesa Mark IV schematic help
  229. Bad Choke?
  230. Ampeg SVT6PRO question
  231. Marshall Valvestate reverb problem
  232. Ampeg Gemini 6 GS-15R Blowing Fuses
  233. Electrical Interference or Arcing?
  234. Twin-Amp biasing
  235. Bassman - no headroom
  236. trouble wiring up heaters
  237. Fender Performer Problems.
  238. H&K Triamp MKII question
  239. Magnatone 460 output impedance
  240. Sound City PA50+ low volumen...
  241. sparked bias supply, dead.
  242. Peavey Classic Head
  243. Mesa MK I RI Tweaking
  244. Trace Elliot C100 Speed Twin Trouble
  245. Burning smell...
  246. Ampeg V4 Troubleshooting Help
  247. EL84 Acceptible load range (Single Ended operation)
  248. BF Super Reverb Question
  249. rating power MosFets?
  250. twin amp red light