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View Full Version : Maintenance, Troubleshooting & Repair



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