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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Fuse popping...
  2. why put 150R on cathodes a Bandmaster Reverb
  3. My 66 bassman is cutting out intermittently and is making a blip blip blip noise?
  4. fender hotrod deville 212 trouble! (no power)
  5. Emc S300
  6. Polytone Mini 12L ICs...
  7. Peavey Century 120 Bass Head Help
  8. Gibson GA18T blowing fuses
  9. GRO100 Intermitant Fuse Blowing
  10. George L Cables
  11. 5E3 tone mods
  12. Noisy Ampeg SVP preamp hummmmmm~
  13. Deluxe Reverb Microphonic?
  14. Is this a symptom of a blown OT?
  15. AMPWARES - anyone know where they went
  16. Peavey Decade schematic
  17. Solid State amp not working-Help!
  18. Quick circuit testing question...
  19. Volume loss in MVA 500
  20. Scratchy gain pot
  21. Ibanez Starfield VT-100
  22. TSL100 Woes: PT2
  23. Lab Series compressor
  24. resistive load to tests?
  25. fuse flows
  26. lound crackling sound on clean channel
  27. Need Help! Channels Switching Automatically?
  28. Ampeg V4BH
  29. Links to Vox schematics
  30. Preamp positions for DSL and TSL
  31. Epiphone Blues Custom = Dead?
  32. Testing Capacitors
  33. marshall lead 12 3005 no crunch
  34. Hum increase with modded EV Jr.?
  35. Marshall DSL 100 - Nothing!
  36. TSL100- V6 not firing up!
  37. 1966 Ampeg Gemini V - low output and horrifying distorted sound
  38. Peavey Bandit 112 low volume
  39. Troubleshooting an RE-201 reverb unit
  40. How well do tube testers work?
  41. Biasing a Crate VC50
  42. Looking for SWR Strawberry/California Blond II Schematics
  43. peavey cs 800 wiring
  44. Valvestate 8080 Low gain on Boost Channel
  45. Replacing speaker in Rickenbacker 2x15?!
  46. Schematic for a Regal R-1160 tube amp
  47. Mashall Valvestate 8080 Issues
  48. fizzy static through AC30 TB
  49. Baldwin C1 problem...the one with the colorful push-buttons
  50. Fender Deville - Same Issue, New Question
  51. Amp cabinet rattle
  52. im getting shocked!!!
  53. transistor matching question
  54. Classic 20 repair manual
  55. Silvertone 1448 Transformer questions
  56. Peavey mace no output
  57. Classic 30 blowing fuses...
  58. Mesa Boogie reverb madness
  59. Bad sound out of my 1964 Princeton
  60. Ampeg b12xt
  61. Noisy Traynor TR-2 reverb tank
  62. JCM900 - urgent advice needed
  63. Counterfeit pwr x-istors
  64. 2uf 25v Caps
  65. JMP-1 Midi Trouble
  66. Mesa Dual recto Questions
  67. Schematic for a Guild Thunderstar Bass Amp 1969... Please..
  68. standby light stays on
  69. 16/32uF 475v Caps?
  70. Sovtek mig 50 issues ?
  71. low frequency buzz from speaker
  72. SF Champ lost headroom
  73. SWR Workingman's 10 and TDA7293
  74. Ampeg SVT-4 schematic anyone?
  75. Ampeg transistor?
  76. Fender Princeton 65 DSP Problems ???
  77. What would you do with a CBS 70w Super Reverb?
  78. a bunch of hiss in preamp
  79. Fender HR Deville Issue
  80. SPDT channel switch pops
  81. Jumpy master volume
  82. Valvestate 8280 shorting problems, need troubleshooting help
  83. Chorus weirdness.....
  84. could someone help me out?
  85. Improving Halfwave Rectifier Question
  86. OT transformer feeding back
  87. jcm800 clone with noise
  88. dirty dusty amp chassis and circuit.
  89. Help debugging my mesa boogie studio preamp
  90. Marshall VS100 Combo Cutting out after a few minutes
  91. Kalamazoo Model One failure...
  92. Peavey Butcher dead
  93. Valve Junior-intermittent cutting out
  94. Messy bogie DC3
  95. Fender Bass Amp Blues
  96. quickest/easiest way to test zeners?
  97. Silvertone 1466 schematic?
  98. Ideas on '67 Bassman problem......
  99. Peavey Deuce schematic?
  100. Roland Cube60
  101. Laney Pro Tube 50 (lead) schematic
  102. Fender deluxe 90 prob....any fender techs?
  103. Rewiring US Marshall for Europe
  104. Scorpion Lead Amp - Cap Replacement
  105. what is the fuse value for the mode four (mf350)
  106. Marshall JCM2000 TSL100 Noise Issue
  107. valvestate 8080 reverb
  108. Output Transformer Question
  109. Peavey
  110. Marshall mg100dfx resistor value r8 & r20
  111. marshall VS265 - high pitched noised at high volumes
  112. Peavey Studio Chorus 210
  113. Fender Deville cathode diode
  114. Filter cap question
  115. Winged C SVEL34
  116. testing transistor temp sensitivity
  117. Marshall MF350 Mode Four - No power up
  118. location of 3rd wire
  119. Spray painted Gril Cloth
  120. Dead Marshall MG100
  121. Kustom K200B-4 hisssssssss
  122. Ampeg B15 oscillations at high volume
  123. Peavey Butcher 6l6 to El84
  124. Plate voltage w/ tubes in
  125. output transformer wiring
  126. replacing power cord strain relief
  127. Peavey PA-400 schematic
  128. Ampeg GV-22 1968 vintage restoration
  129. TNT-100 Repair Problem 2
  130. Marshall VS100 blowing fuses
  131. Hartke HA-3500 Troubleshooting - Bass Amp Crackles & Pops
  132. dummy math question capacitance
  133. Stage 112 cuts in and out
  134. Orange Rocker 30 Schematic
  135. Blowing Fuses
  136. Carvin PB 150 FETs
  137. JCM 900 problems
  138. hiss from output/power amp
  139. Old Elk Viking Amp Head Scratcher
  140. Carvin Legacy help needed
  141. Peavey Classic 30/Smack it to power up
  142. Marshall VS65R Problem
  143. Powering up with a variac
  144. question about bias cap values?
  145. Genz Benz: red or black?
  146. bias caps: Sprague Atom or Xicon?
  147. Vibrato LDR
  148. Pic of turntable stand
  149. Transformerless Amp Safety
  150. Mesa Boogie Lone Star Hum Please Help
  151. crate vc5310 problem
  152. peavey classic 50 410-poping,cracking
  153. PI anode resistors
  154. Marshall TSL-601 - Quiet Volume
  155. Mesa Mark IV schematic help
  156. Bad Choke?
  157. Ampeg SVT6PRO question
  158. Marshall Valvestate reverb problem
  159. Ampeg Gemini 6 GS-15R Blowing Fuses
  160. Electrical Interference or Arcing?
  161. Twin-Amp biasing
  162. Bassman - no headroom
  163. trouble wiring up heaters
  164. Fender Performer Problems.
  165. H&K Triamp MKII question
  166. Magnatone 460 output impedance
  167. Sound City PA50+ low volumen...
  168. sparked bias supply, dead.
  169. Peavey Classic Head
  170. Mesa MK I RI Tweaking
  171. Trace Elliot C100 Speed Twin Trouble
  172. Burning smell...
  173. Ampeg V4 Troubleshooting Help
  174. EL84 Acceptible load range (Single Ended operation)
  175. BF Super Reverb Question
  176. rating power MosFets?
  177. twin amp red light
  178. Bassman PI resistors
  179. 120 Hz Hum in Solid State Amp
  180. Vox AD15VT sound problem
  181. bedrock 1200 Questions
  182. Crate Turbo Valve 60 help
  183. Problem with Ampeg B1RE
  184. Marshall MKII schematic
  185. Sovtek MIG 50 help please
  186. Excessive hum
  187. Old Peavey TNT 100 SS Series Has Low Distorted Output
  188. Marshall MF350
  189. New Guy With A Question.....
  190. Orange Rockerverb Noise Problem
  191. Peavey Classic 50 212 wierdness
  192. jc120 speaker wiring
  193. Strange Feedback with medium/high gain
  194. Troubleshooting motorboating
  195. B-52 At100 Head Repair HELP PLease!!!!!!!
  196. Fan noise
  197. Laney LC15 Volume Fluctuation, Suspect Pots
  198. Need a 5/10/20 Cap for Silvertone
  199. HH VS Series schematic
  200. Turntable service stand - a little off the forum
  201. EL34 reliability mod
  202. What can cause spring reverb tank to fail?
  203. Fender Dual Showman Reverb Problem
  204. Power Transformer testing? (kinda long)
  205. Fried J & Hyde
  206. Ampeg VT-22 slight mishap
  207. Marshall JTM60 Trim Pot Location
  208. 6FQ7 phase inverter
  209. B+ fuse killer
  210. no sound
  211. Tremolo all bunched up
  212. phase inverter in the 30th anniversary
  213. Marshall JCM2000 DSL50 hum
  214. Fender opto isolator "roach" which end is which?
  215. Peavey Classic 50/212 ... Standby Issues!
  216. Trace Elliot Velocette 110
  217. twin reverb trem not working
  218. Fender stage 100 ? very weak dist sound
  219. Ampeg 7027A Power Tubes Replacement Blues
  220. TSL100 Bias Problems
  221. Mesa Triaxis Memory Loss
  222. Circuit Board issue!!!!!
  223. 65 Deluxe reissue pots
  224. Adjusting BIAS in Sovtek Tube Midget 50H Head
  225. annoying hum
  226. Peavey Classic Dual Death Cap Question
  227. Biasing a Fender Blues Junior Question
  228. Peavey Bandit Reverb Issue
  229. 1973 Marshall
  230. Fender Pro Junior: Problem or Normal? Help!
  231. Hafler T2 Tube Preamp
  232. Please Help Marshall Tsl Problem
  233. 1979 Peavey Bass 400 MarkIII
  234. Fender SRRI Can't Bias Hot Enough
  235. Marshall JTM60 Output mystery??
  236. Fender "The Twin" Schematic
  237. Hartke 5000 help ?
  238. Combo or Head/Cab?
  239. Panel meter wiring
  240. Buzzing Blues Junior
  241. Marshall valvestate 8080 how to get more reverb
  242. Peavey Classic 30
  243. Vibrolux Reverb Bias?
  244. SFDR w/ MV has very low output volume...Any ideas?
  245. weird thing happens on opamp
  246. Marshall Valvestate vs100 Problem
  247. Silvertone 1474 questions
  248. What size fuse to put in O.T. center-tap?
  249. Ampeg B2 RE
  250. Setting the Mosfet bias on an Ampeg SVT 3 PRO