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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Recommendation for oscilloscope test leads for guitar amps.
  2. cathode bypass caps voltage in princeton reverb
  3. Trouble with Mesa Stiletto Deuce
  4. Peavey Triple XXX Head has strange problem Please Help
  5. Bugera 333 Channel Switching Circuit
  6. Yamaha MagicStomp
  7. Fender M-80 Combo amp Mods or revisions on power supply or circuit?
  8. ADA MicroTube Output Design
  9. Tremolux 5G9 - tremolo not working
  10. Trace Elliott Commando killing output transistors
  11. Advice about multiple circuts
  12. Sunn Beta Bass preamp troubles
  13. Audio generator recommendation for n00b.
  14. Fender M-80 Combo amd 1x12 needing a schematic
  15. 73 Super Reverb
  16. Peavey Ultra (Mega) combo problems
  17. Fender Twin Reverb Reissue distorted reverb
  18. Ampeg "Joey"???
  19. Traynor Guitar Mate Reverb
  20. Spider jam schematics
  21. Have I killed my output tranny?
  22. Troubleshooting by Tube Substitution a Fender Twin Reverb
  23. Operadio pia125
  24. elevated heater center tap
  25. Fender Blues Jr III - FX Loop negates reverb
  26. MESA Mk3 reverb question
  27. Jcm 900 mkiii direct line out buzz
  28. Peavey Classic 50 Main transformer
  29. Transistor Crossover part help
  30. Bassman 200 Power Transformer?
  31. Peavey Classic 50 50 Power Amp Bias mod/repair
  32. Blackfaced Fender Twin Reverb Master Vol buzzing
  33. Fendet twin reverb osillating when the reverb depth is increased
  34. ADA MicroTube 100 Popping Fuses
  35. Peavey Studio Chorus smoking resistor
  36. Carvin X-50B with glowing second grids of EL34
  37. taking the blanket off a Valveking...
  38. Fixing my Peavey rage 158. What kinda pots and any mods while im in there.
  39. GMX212 Doenst record my presets!
  40. Crate Vintage Club 30 Squeal
  41. The Peavey 6505 and a New Failure Mode
  42. Fender Bassman 135; what to do with that voltage divider?
  43. How do you find a break in a cable?
  44. JC 120 wont turn on help please
  45. Marshall jcm 2000 dsl blowing ht fuse.
  46. Hot Rod Deville BAD Oscillation On More Drive
  47. Silvertone 1471 rehab
  48. Old panaramic amp, reverb and tremolo issues
  49. Help troubleshooting treble pot issue
  50. Ampeg V2
  51. Power trans "gurgling"
  52. CompuBias readings on 1974 Vibrolux... does it seems "cold"?
  53. Marshall Valvestate 2000 avt150 fuse help plus.
  54. Marshall JCM2000 Power Transformer - Taps For 220V?
  55. Mesa MK IV footswitch system
  56. Koch Amp burnt PCB
  57. Fender Hot Rod Deluxe Reverb Buzzing
  58. Hot Rod Deville With Harsh Crackle/Distortion
  59. Crackle in Marshall VS100
  60. Peavey Bass Mark III 400BH won't power on
  61. SVT4-pro question
  62. Marshall Valvestate 8100 / 8080 Shorting Output
  63. replacing 2 prong ac cord
  64. While biasing a Fender Tremolux (AA763) the biasing is current is increasing?
  65. FX loop buzz only when unplugged again
  66. Valveking troubles
  67. short bursts of hi freq squeal?
  68. Marshall DSL 100 overall volume issue
  69. Line 6 Spider 2 head trouble
  70. Lets try again..>AC30TB clone build trouble
  71. tag board wiring
  72. Backline 600 schematic
  73. Peavey Delta Blues 30 (15x1)
  74. need information about lŽacoustics 112p monitor
  75. Is a rebias needed if using the same tubes?
  76. Distortion issue – question about bias
  77. Acoustic Model120 Part identification
  78. Marshall Haze MHZ15 Bias Clarification
  79. old Egnater ie4 preamp died!, smells burnt!, help!
  80. 120 Hz hum on a solid state amp is usually...
  81. Blues DeVille pots?
  82. Geloso G226-A troubles
  83. squealing reverb in a Supro Corsica
  84. Fender Frontman FM25R channel switching problem
  85. Ashdown thermal problem
  86. Ab763 weak tremolo issue
  87. figuring out rectified DC volts; reversing a transformer
  88. Need a CTS pot for Crate amp?
  89. I'm looking for the red led for a 4 button Fender Twin Amp footswitch
  90. Am I missing something??
  91. Roland Cube 60 has 50 mV of DC offset.... What is considered too much?
  92. Yamaha G100-112 series II - parametric EQ pops
  93. need part # for VOX
  94. DUH!
  95. Deluxe Reverb rectifier tube
  96. Peavey Butcher Low Voltages
  97. crate gx-130c
  98. voltage divider for a power source
  99. Bugera Amps
  100. Peavey XXX and JJ E34L problem???
  101. Gemini VI GS-15R Schematic question - balance the output tubes
  102. Fender Vibro-King CSR4 tremolo speed issue...
  103. Sovtek Mig-60 blowing fuse
  104. Where can I find a 10k Audio slider control for my old Carvin
  105. Fender Studio Amp grill cloth trim
  106. Bassman20 Fun&Games&Agony
  107. bizarre power supply issue
  108. Blackheart LG Head - no sound
  109. Marshall Valvestate 80V (8080) problem
  110. Hot Rod deluxe intermittent volume loss problem
  111. Tube Amp Shutting Off
  112. Tube blown or what?
  113. Any of you a T.C. Electronics warranty station? Need a part
  114. Biasing A Red Knob Dual Showman
  115. Variac (GE Volt-pac) Wiring Guidance Requested
  116. Fender M80 bass amp distortion on output
  117. peavey mace power transformer failure
  118. Peavey TKO bass amp
  119. irritating "sheen" on "A" notes
  120. Gibson GA 20 RVT - Tremelo Opt-coupler (500) replacement?
  121. Connector Problems
  122. Low distorted output, no channel switching on Blues Deluxe
  123. Champ blowing fuse
  124. Ampix
  125. SWR SM-900 Troubles
  126. replacement rectifier
  127. Signal related crackle
  128. Kustom PC 5065
  129. JCM800 head with oscillating volume + pops and hum
  130. AC30 with intermittent volume
  131. What's the best glue to secure filter caps?
  132. 4x6v6 amp not loud?
  133. HotRod Deville motorboats only on Drive channel
  134. Peavey VTM 60
  135. Peavey Classic 30 cant handle low end from 2001 Gibson R8 Les Paul
  136. Peavey Windsor Studio The output tube el 34 bournd out
  137. Is this a screen resistor problem?
  138. Laney L5-112T efx loop problem.
  139. Peavey classic 50/50 240V wiring
  140. Carlsbro GLX 80 Limited Edition - Crackling on clean channel
  141. DIY AA764 Champ Squeals Loudly
  142. How do I open a Fishman Loudbox?
  143. Is anybody familiar with the Peavey Classic 100 top?
  144. Bugera 333xl Sudden Reverb Circuit Hiss
  145. 5150 II tubes
  146. Acoustic G60T Combo - No channel switching
  147. Boston area source for tubes and amp parts
  148. Bad Cat Hot Cat "Gain" channel static noise?
  149. Need a replacement tube/pwr supply pcb for DSL100
  150. Blackstar 100 head, power tubes redplate
  151. Vintage amp issues
  152. Cathode bias *cap* issue - weird whistle
  153. Need help with a Fender Stage 160
  154. Crate V100H, Loud Technologies, Parts, Replacement Power Supply
  155. Weird bias loss!
  156. Marshall tsl fx loop bleed - help needed!
  157. 65 Twin Reissue problems
  158. Ampeg BA-115T keeps blowing fuses!
  159. Fender stage 100 blowing outputs
  160. measuring low value resistors
  161. Marshall MG15DFX clicking andpopping when turned on
  162. AVT 150 problem please help me
  163. SWR 350 problem
  164. silvertone 1484 filter cap can replacement
  165. How can I reduce hum in a Fender Champ?
  166. keep blowing the same capacitor
  167. Kustom K50 Main PCB Mounted 'Can' Style Diode(?) Help
  168. Ampeg SVT 3 pro PT secondaries
  169. Em field from tube amp rack style mounting
  170. Opto-trem driver tube bias?
  171. Peavey F800G Falling apart, Motorboating
  172. Vibrato does not work.
  173. Troubleshooting Blown Fuse
  174. Any buzz hum troubleshooting ideas for Hiwatt pcb?
  175. SF VIbro Champ Really Low Volume, Clean All the Way Up
  176. Hartke HA2000 powers up-no output
  177. Mesa Triple Rectifier Serial Loop Mod-Problem
  178. no sound lifco 630
  179. Peavey TNT 130 Board troubleshooting
  180. Marshall MG250-DFX
  181. Screen Grid Resistors
  182. What are indications of output transformer going bad??
  183. Where can I buy Ashdown knobs?
  184. princeton reverb problem
  185. Silverface Princeton caps
  186. begging for a helping hand, TSL 100
  187. Magnavox 5f1 tweed style tweed low watt style transformer issues
  188. peavey 5150 setup
  189. Feedback Problems Krank Rev 50
  190. Amp has started to howl and squeal: I need advice
  191. Foot switch education please
  192. Hot Rod deluxe signal when clean volume off
  193. Fender SRRI problem
  194. Crate GT 200 Lead channel Too Much distortion
  195. marshall jcm 800 distortion channel not fucntioning properly
  196. Replaced power transformer, now my amp is really quiet
  197. 65 Princeton Reverb
  198. Carvin AG100D input problem
  199. Kalamazoo Model 1 has developed some hum
  200. Now what?!?
  201. Randall Rg100es - Red chanel barley works
  202. Plexi Volume Trouble
  203. How hot is too hot?
  204. Fender Bandmaster
  205. Hiss and Hum?
  206. Fender Twin Amp buzzing coming from circuit board!?
  207. Crate V50 now the relay?
  208. Problems with peavey 5150 II distortion channel
  209. 1970's Peaveay "Classic" (not classic, 30 or 50) Low Volume Problem
  210. Peavey 5150 combo
  211. Any max temp specs for common tubes?
  212. Marshall AVT 150HX No Power
  213. Yes, size does matter. Or not? (Transformer Question)
  214. Traynor Bass mate
  215. Troubleshooting Marshall Mark II 100W Lead Master Vol. Model 2203
  216. 73 Blackfaced Twin buzzing on low notes
  217. Fender Blues Deluxe isssues..
  218. Amp Hum- Crate G-60
  219. Looking to apply some T.L.C (Heath TA-16)
  220. Mag 300 Drawing too much current? Blows fuses.
  221. 2 stroke/ Angela pse - hum but no guitar
  222. Fender Super-Sonic 22 Noise
  223. need help Marshall Mode 4
  224. Vox Super Foundation Bass problem
  225. New Output Transformer...worth it?
  226. which end is ground on this mylar bypass cap?
  227. Music Man 2275-130 redplating one side
  228. Behringer BX3000T start, shutdown problem
  229. Issue with Ampeg Gemini II chassis.
  230. Fender Blues Junior missing input beauty ring
  231. Marshall MG100DFX Faint Output - Power Out OK
  232. A very weird problem w/ a Marshall amp head
  233. The order of tubes. Blackstar HT-100
  234. Gallien Krueger 200MB just started shorting
  235. 2x16ohm + 2x80hm, deville 4x10
  236. Help please- Marshall 8100-Low Volume on OD1 Channel only
  237. Embarrassingly Simple Roland JC-120 Question
  238. Laney LX65R Overdrive channel not working
  239. No lead channels with ENGL Powerball?!
  240. Cathode bias 6L6s, Voltage rise(50v) on one power tube when treble is turned up????
  241. Peavey VK100 with dead switching system
  242. final tests for repairs
  243. marshall valvestate VS265 problem
  244. Ampeg V4 eating tube s
  245. Odd voltages
  246. Static discharge causes amp noise?
  247. Black Widow Speaker basket interchange
  248. Hiwatt tubes?
  249. EVJ Roaring
  250. 5E3 amp output power question