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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Hiwatt Lead 50R no quiscient current
  2. Bad L-Pad SWR?
  3. Issues with my Fender Stage 160
  4. Lost my Impedance Selector Switch
  5. Hiwatt Lead 50R cannot remove chassis!
  6. Transformer Troubleshooting
  7. Marshall Valvestate 8040 sound dies
  8. 5150 combo - New GT-6L6C Power Tubes
  9. Schematic For Marshall MG 250?
  10. 5150 combo standby led stays off
  11. Old Fender Twin Buzz in Reverb
  12. How do you install Transistors
  13. fender red knob "the twin"
  14. Problems With Ampeg Svt2 Pro
  15. Fender Stage 160 problems
  16. Reverb on a 1982 Musicman 112RD50 not working
  17. Marshall Silver Jubilee switching issues
  18. SWR Studio 220 - dead
  19. Ampwares
  20. Fender stage 100 DSP Head need help
  21. using coax cable or input
  22. Cap Job
  23. Boogie MarkIIB going sour
  24. Vibrosonic Reverb Vibrato Problem
  25. PING: Enzo
  26. Vox AD15VT, Pwr amp works but now sound from input
  27. Crate XT120R "high" pot problem
  28. Maestro Phase shifter - Splat sounds
  29. Strange power section problem
  30. Hiss in BF Bassman build
  31. Traynor YGM3 distorted reverb
  32. Peavey Classic VT 212
  33. Bass amp crackling noise
  34. Peavey XR 600B no power to front panel
  35. Blackface Fender Twin rattle
  36. Buying an Oscilloscope
  37. Crate BX-15 Dead
  38. Laney VC30 Low volume problem
  39. Where to buy PCB-mount pots?
  40. Crate BX-2115 schematic
  41. Yorkville XS800H (hiss) need advice
  42. Peavey Delta Blues 210, tremalo won't cut off.
  43. Screwed up!
  44. blues deluxe problem
  45. budda Super Distortion 30/Ring Modulator
  46. Peavey Delta Blues: Weak Vibrato
  47. jtm60 output transformer
  48. Traynor Ygm-3 Broken - Need Help!
  49. Ghost in the 18 watt
  50. Mu-tron Biphase - no effect
  51. SF Bassman - unwanted distortion
  52. Peavey Express 112 schematics
  53. quick smt question
  54. low volume on vibrato channel
  55. ID this switch for a Mutron AutoWah w/photo
  56. Hickok 532 Tube Tester--How to test 6BQ5, etc.
  57. GK1001rb Schematic Wanted
  58. Bias circuit problems...
  59. Swr 350
  60. Wierd hum in Peavey Transformer
  61. Marshall 8040 (V40) problem
  62. chassis and head dimensions ?
  63. Vibro-Champ Help
  64. Ampeg vt40 combo old enough to smoke
  65. Capacitor substitutes?
  66. Fuse popping...
  67. why put 150R on cathodes a Bandmaster Reverb
  68. My 66 bassman is cutting out intermittently and is making a blip blip blip noise?
  69. fender hotrod deville 212 trouble! (no power)
  70. Emc S300
  71. Polytone Mini 12L ICs...
  72. Peavey Century 120 Bass Head Help
  73. Gibson GA18T blowing fuses
  74. GRO100 Intermitant Fuse Blowing
  75. George L Cables
  76. 5E3 tone mods
  77. Noisy Ampeg SVP preamp hummmmmm~
  78. Deluxe Reverb Microphonic?
  79. Is this a symptom of a blown OT?
  80. AMPWARES - anyone know where they went
  81. Peavey Decade schematic
  82. Solid State amp not working-Help!
  83. Quick circuit testing question...
  84. Volume loss in MVA 500
  85. Scratchy gain pot
  86. Ibanez Starfield VT-100
  87. TSL100 Woes: PT2
  88. Lab Series compressor
  89. resistive load to tests?
  90. fuse flows
  91. lound crackling sound on clean channel
  92. Need Help! Channels Switching Automatically?
  93. Ampeg V4BH
  94. Links to Vox schematics
  95. Preamp positions for DSL and TSL
  96. Epiphone Blues Custom = Dead?
  97. Testing Capacitors
  98. marshall lead 12 3005 no crunch
  99. Hum increase with modded EV Jr.?
  100. Marshall DSL 100 - Nothing!
  101. TSL100- V6 not firing up!
  102. 1966 Ampeg Gemini V - low output and horrifying distorted sound
  103. Peavey Bandit 112 low volume
  104. Troubleshooting an RE-201 reverb unit
  105. How well do tube testers work?
  106. Biasing a Crate VC50
  107. Looking for SWR Strawberry/California Blond II Schematics
  108. peavey cs 800 wiring
  109. Valvestate 8080 Low gain on Boost Channel
  110. Replacing speaker in Rickenbacker 2x15?!
  111. Schematic for a Regal R-1160 tube amp
  112. Mashall Valvestate 8080 Issues
  113. fizzy static through AC30 TB
  114. Baldwin C1 problem...the one with the colorful push-buttons
  115. Fender Deville - Same Issue, New Question
  116. Amp cabinet rattle
  117. im getting shocked!!!
  118. transistor matching question
  119. Classic 20 repair manual
  120. Silvertone 1448 Transformer questions
  121. Peavey mace no output
  122. Classic 30 blowing fuses...
  123. Mesa Boogie reverb madness
  124. Bad sound out of my 1964 Princeton
  125. Ampeg b12xt
  126. Noisy Traynor TR-2 reverb tank
  127. JCM900 - urgent advice needed
  128. Counterfeit pwr x-istors
  129. 2uf 25v Caps
  130. JMP-1 Midi Trouble
  131. Mesa Dual recto Questions
  132. Schematic for a Guild Thunderstar Bass Amp 1969... Please..
  133. standby light stays on
  134. 16/32uF 475v Caps?
  135. Sovtek mig 50 issues ?
  136. low frequency buzz from speaker
  137. SF Champ lost headroom
  138. SWR Workingman's 10 and TDA7293
  139. Ampeg SVT-4 schematic anyone?
  140. Ampeg transistor?
  141. Fender Princeton 65 DSP Problems ???
  142. What would you do with a CBS 70w Super Reverb?
  143. a bunch of hiss in preamp
  144. Fender HR Deville Issue
  145. SPDT channel switch pops
  146. Jumpy master volume
  147. Valvestate 8280 shorting problems, need troubleshooting help
  148. Chorus weirdness.....
  149. could someone help me out?
  150. Improving Halfwave Rectifier Question
  151. OT transformer feeding back
  152. jcm800 clone with noise
  153. dirty dusty amp chassis and circuit.
  154. Help debugging my mesa boogie studio preamp
  155. Marshall VS100 Combo Cutting out after a few minutes
  156. Kalamazoo Model One failure...
  157. Peavey Butcher dead
  158. Valve Junior-intermittent cutting out
  159. Messy bogie DC3
  160. Fender Bass Amp Blues
  161. quickest/easiest way to test zeners?
  162. Silvertone 1466 schematic?
  163. Ideas on '67 Bassman problem......
  164. Peavey Deuce schematic?
  165. Roland Cube60
  166. Laney Pro Tube 50 (lead) schematic
  167. Fender deluxe 90 prob....any fender techs?
  168. Rewiring US Marshall for Europe
  169. Scorpion Lead Amp - Cap Replacement
  170. what is the fuse value for the mode four (mf350)
  171. Marshall JCM2000 TSL100 Noise Issue
  172. valvestate 8080 reverb
  173. Output Transformer Question
  174. Peavey
  175. Marshall mg100dfx resistor value r8 & r20
  176. marshall VS265 - high pitched noised at high volumes
  177. Peavey Studio Chorus 210
  178. Fender Deville cathode diode
  179. Filter cap question
  180. Winged C SVEL34
  181. testing transistor temp sensitivity
  182. Marshall MF350 Mode Four - No power up
  183. location of 3rd wire
  184. Spray painted Gril Cloth
  185. Dead Marshall MG100
  186. Kustom K200B-4 hisssssssss
  187. Ampeg B15 oscillations at high volume
  188. Peavey Butcher 6l6 to El84
  189. Plate voltage w/ tubes in
  190. output transformer wiring
  191. replacing power cord strain relief
  192. Peavey PA-400 schematic
  193. Ampeg GV-22 1968 vintage restoration
  194. TNT-100 Repair Problem 2
  195. Marshall VS100 blowing fuses
  196. Hartke HA-3500 Troubleshooting - Bass Amp Crackles & Pops
  197. dummy math question capacitance
  198. Stage 112 cuts in and out
  199. Orange Rocker 30 Schematic
  200. Blowing Fuses
  201. Carvin PB 150 FETs
  202. JCM 900 problems
  203. hiss from output/power amp
  204. Old Elk Viking Amp Head Scratcher
  205. Carvin Legacy help needed
  206. Peavey Classic 30/Smack it to power up
  207. Marshall VS65R Problem
  208. Powering up with a variac
  209. question about bias cap values?
  210. Genz Benz: red or black?
  211. bias caps: Sprague Atom or Xicon?
  212. Vibrato LDR
  213. Pic of turntable stand
  214. Transformerless Amp Safety
  215. Mesa Boogie Lone Star Hum Please Help
  216. crate vc5310 problem
  217. peavey classic 50 410-poping,cracking
  218. PI anode resistors
  219. Marshall TSL-601 - Quiet Volume
  220. Mesa Mark IV schematic help
  221. Bad Choke?
  222. Ampeg SVT6PRO question
  223. Marshall Valvestate reverb problem
  224. Ampeg Gemini 6 GS-15R Blowing Fuses
  225. Electrical Interference or Arcing?
  226. Twin-Amp biasing
  227. Bassman - no headroom
  228. trouble wiring up heaters
  229. Fender Performer Problems.
  230. H&K Triamp MKII question
  231. Magnatone 460 output impedance
  232. Sound City PA50+ low volumen...
  233. sparked bias supply, dead.
  234. Peavey Classic Head
  235. Mesa MK I RI Tweaking
  236. Trace Elliot C100 Speed Twin Trouble
  237. Burning smell...
  238. Ampeg V4 Troubleshooting Help
  239. EL84 Acceptible load range (Single Ended operation)
  240. BF Super Reverb Question
  241. rating power MosFets?
  242. twin amp red light
  243. Bassman PI resistors
  244. 120 Hz Hum in Solid State Amp
  245. Vox AD15VT sound problem
  246. bedrock 1200 Questions
  247. Crate Turbo Valve 60 help
  248. Problem with Ampeg B1RE
  249. Marshall MKII schematic
  250. Sovtek MIG 50 help please