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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Converting: 220 - 117V
  2. 1976 Fender Champ hums 60hz always
  3. SWR Silverado power-up problem
  4. Crate V-33 Do any of these last?
  5. Help with IORIO amp problem/output tranny?
  6. Evans amp schematic ?
  7. Lord Valve where are you?
  8. "Blows Fuses" and "Is my transformer dead?"
  9. Marshall AVT 50x OD channel problem
  10. SWR Bass amp fan issue
  11. Speaker Ohms Question
  12. AMpeg SVT-CL Unholy Noise
  13. Crate Vintage Club 50, Input Jack Issues?
  14. Peavey Stereo Chorus 212 Schematic?
  15. ID this part ?
  16. Danelectro DM10 thumping
  17. Ampeg SVT 4 T schematic??
  18. HELP with wiring a Teisco Checkmate CM-10
  19. Old Fender fiber boards
  20. Old Fend. Transf. Primary Colour Codes
  21. Configurable Dummy Resistor Load Box for Amp design/repair
  22. Amp trouble
  23. Schematic Request Peavey Envoy 110
  24. Connecting a 110V amp to 240V - possible?
  25. B-15 Crackle
  26. faint signal at zero volume
  27. Hot Rod Deluxe - Mystery
  28. Help the newbie with an Encore 65, distorted
  29. Acoustic Control G100t
  30. 66 Vibro Champ needs some help
  31. Video of hum when I switch on the reverb of my Twin Amp
  32. New power transformer issues
  33. Crate BV120H bias?
  34. varistor touble
  35. Crate Palomino v16 Schematic?
  36. PV classic 30 PT?
  37. Sunn 300 T Bias / Balance issues
  38. Marshall JCM2000 has no sound
  39. JCM 800 2205
  40. Mesa Boogie Formula Pre - Relay
  41. Fender cab question
  42. B+ to high on homebrew
  43. Roland JC120
  44. peavey VB2 schematic
  45. Another peavey 400 bh problem
  46. Ampeg B2 Voltages
  47. Fender 'Twin Amp'
  48. Marshall MG 100HDFX-Clean switching?
  49. Line-in confusion
  50. 1968 Duo Medalist switch issue
  51. Vibro Champ Heater Wiring
  52. Amp troubles!
  53. Randall RG200
  54. Where's the best place to buy filters, caps, etc?
  55. Replaced V1 plate resistor, now I am getting squealing
  56. '79 JMP 50. Old tubes cause low bias voltage?
  57. Fender SK 100B pre amp section out
  58. marshall tsl60 switching problems
  59. Your thoughts on Filter Caps.
  60. Mesa Boogie .50 Caliber Amp - Low Output On Overdrive Channel
  61. MIG100 - Replacing output jacks
  62. Crackeling Peavey Classic 50/50
  63. TSL 602 'Squawking'
  64. Gibson GA42RVT repair issues
  65. Blue glow on the inside glass
  66. 62 Ac30 Distorting :(
  67. peavey delta blues ?
  68. Marshall AVT150H channel switch popping
  69. Rivera K-tre too loud and hissing
  70. yamaha G50-112II
  71. Peavey XR1200 Repairs In Progress - Help Requested
  72. Ampeg B-2 Fan Trouble
  73. '67 bandmaster - intinsity pot for tremolo doesn't start working till about 5
  74. crate gfx-212 - bad input?
  75. G1 amp in Case
  76. Rectifier path of travel
  77. Marshall Valvestate 8080 big noise when starting up
  78. Mesa Stiletto problem
  79. Marshall Mode Four
  80. Ampeg SVT 5Pro Schematic
  81. Radial Headbone
  82. Anybody got a gut shot of a Gibson Ranger GA20?
  83. Mesa Boogie 50 Caliber + red plating
  84. Ampeg SVT 4 Pro curcuit breaker
  85. Ampeg BT25
  86. classic 30 with low volume and odd sounding distortion
  87. PV XR400b mixer/amp with 200 H power module low output
  88. Sunn Beta Lead power transistor
  89. Problem with a Mesa Boogie Dual Recifier
  90. mesa boogie 3 channel triple rectifier switching channels by itself , other noise
  91. FRED Diodes For A Kustom 200B?
  92. SF 135Watt: Dropping the B+ voltage, and bias mod
  93. Silly Questions from a Twin Reverb owning DIY Newbie
  94. Need a little help with a Laney Gh100L
  95. Broken amp, need diagnosis help
  96. Roland Jazz Chorus 120 "Schematics needed asap"
  97. Fender Princeton 65 DSP - Low Volume and Hiss
  98. Dead Vibrato: Fender Twin Reverb Reissue
  99. Reverb issues w/ a Peavey Classic 30
  100. Post In Music Electronics - Link
  101. help with a Kustom 200B
  102. Valvestate 8080 issues
  103. ill amp 'crackles' into speaker ?
  104. Acoustic Model 123
  105. Motorboating issue
  106. Fender Acoustasonic II SFX problem
  107. Hartke 3500 relay problems?
  108. VOX AC30/6 TB scratchy static noise
  109. Help ID a Mains transformer for 135W Twin
  110. Signal tracing rules
  111. Fender Hot Rod Deluxe won't play!
  112. Hot Rod Dlx Fizzy artifact!
  113. need help fixing my fender fm 212r
  114. almost a 6G6 build
  115. Tech-Caps???
  116. Crate GLX65 Question; Working Amp w/ no Sound from Speaker
  117. Marshall DSL 2000?? SO confused!!
  118. re:Peavey XR600B
  119. Taking the next step in my builds and repairs.
  120. Swr la series chirps on power up
  121. Tonefullness of one cap over another
  122. Low V supply issue Firebass 700
  123. LANEY VH100r Power tranformer buzz fixed ...
  124. Polytone - blown power transistor
  125. wave -like sounds
  126. marshall avt 150 h
  127. Crate GX-15R doesn't work - Any ideas?
  128. rca soldering
  129. Deluxe Reverb Mod or mix-up?
  130. Fender Twin Hum Hum Hum
  131. Major goof, major problem OT
  132. Crate V50 ?
  133. Ampeg SVT5 Pro
  134. High-Frequence Noise at Roland Bolt-30
  135. What Reverb Tank for a Yamaha Fifty 112?
  136. Power Amplifier Repair
  137. Problem with Fender Princeton DSP
  138. Peavey VTM 60 Blows fuse
  139. clean channel gone on my little Fender Champ 30 - fixable?
  140. Ampeg SVT 5 Pro
  141. redplate/biasing issue
  142. Behringer GMX212
  143. Amp/Guitar Temperature Sensitivity
  144. fizz and oscillation in Peavey Rockmaster head
  145. Classic 50 tube biasing?
  146. i have damaged my Crate VFX,please help..
  147. 6G12-A Concert clone behaving oddly
  148. Roland Cube 60 -- missing reverb
  149. Peavey Heritage VTX Series
  150. Blues DeVille reissue squealling preamp
  151. Substitute GZ34 for 5U4GB?
  152. Princeton Reverb Re-work
  153. No sound from speaker..?
  154. AC at pin 8 on a 6V6
  155. Pot replacement....I got "shafted"
  156. Keeps blowing the fuse
  157. Blues deluxe..same ole' problem
  158. Color coded capacitor
  159. Miscellaneous Question About Amp Damage
  160. Weber 6a14hp buzz when reverb is on.
  161. line 6 flextoneII hd head problem
  162. Ultimate Chorus
  163. Guitar Research T64RS TUBE
  164. Roland Bolt 60 reverb tank?
  165. Fuse Pops - Transformer Dead
  166. Orange rockerverb owners?
  167. Lafayette (or Univox??) U-80A mystery amp
  168. identify a transformer
  169. Bassman 100 - Should it be louder?
  170. Super Champ XD
  171. Amp Tech Needed in So Cal...
  172. Fender Princeton Chorus problems
  173. Marshall MG100dfx
  174. Marshall Super lead 1959 Problem
  175. JTM45 Build Buzz Problem
  176. Svt 4 pro tubes??
  177. Question about Marshall Valvestate 8100
  178. Marshall JMP 50 watt bias
  179. Traynor yvm-1 voice master acting funny - - -
  180. Fender Concert II problem ( preamp)
  181. Sticker on power tubes? Harmful?
  182. Need pot volume control for op pro preamp Ovation Guitar
  183. Marshall AVT150 Blown Fuses
  184. Diodes for a Twin
  185. Hiwatt Classic 50 Crackling when cranked
  186. NOS 6L6 vs Currently made 6L6
  187. More failed Jamicon 12,000u 80v
  188. Fender Super Reverb AA763 Bias
  189. marshall 8080 pot problems
  190. Need help with Fender Twin Reverb
  191. Vibrolux low volume
  192. Slightly off topic, but strange
  193. High voltage on pin 1 of V5 in '67 Super Reverb
  194. Powering vtl5c1 from heaters on SLO 100 ?
  195. Fender Twin loud reverb hiss
  196. Awful noise from Fender Bantam Bass
  197. power noise parkg10r amplifier
  198. HomeBrew Troublshooting Help
  199. Silvertone 1484 help needed
  200. PEAVEY BRAVO 112 crunch channel bad switch?
  201. 78 Crate CR-1R, 72 Gibson G20, 2006 Randall RG 100 G3 100 watt valve dynamic
  202. Ampeg svt cl hum issues
  203. Polytone Mini Brute lll, lV, M-PA
  204. Need help trouble shooting peavey xl-500 mix amp
  205. Serious ?grounding? problem - kind of scary...
  206. Silvertone 1484 diode substitutes
  207. Trouble with Peavey Backstage 110 amp
  208. '67 Ampeg Jet, no trem & high voltage
  209. Buzz/click!-dead when switching off standby
  210. New Matamp schems
  211. Where to get replacement parts for a Fender Twin Reverb?
  212. Phase linear 700b help!
  213. Complete newbie to amp repair
  214. Peavey TNT Fuse blowing
  215. Park G10 amp at 4Ohm Speaker?
  216. Need schematic for a Crate VC6112
  217. Crate Blue Voodoo 120H acting up:
  218. Mesa DC-5, Massive Hum on Clean Channel
  219. My gibson amp
  220. Peavey Classic vtx series- Troubleshooting repair help needed!!!
  221. fender studio lead amp problem
  222. Dear god not the Selmer again... & PPIMV...
  223. Peavey VT Classic 212 Broken Phase Help
  224. Yamaha G50-112 owners manual wanted
  225. marshall atv100 have no distortion?
  226. Palomino V8 loud hum.
  227. 5e3 volume interaction
  228. SWR workingmans 15 Frying resistors
  229. 59 Bassman reissue cuts out after 10 minutes
  230. Crate Vintage 30
  231. peavey 5150 212 won't power on
  232. SVT 350 XLR out HUM
  233. 65 Twin Reverb Vibrato Problem. Please Help
  234. Ampeg SVT-6PRO death & resurrection
  235. Sunn Sceptre
  236. Blue Voodoo clean channel hiss without volume
  237. Peavey Ultra switching pops
  238. peavey400bh
  239. Princeton speaker rattling in the breeze
  240. solder type ????
  241. Randall RG200
  242. Fender Pro Tube Pro Reverb - Dead Tremolo and Noisy Reverb
  243. Fender Bassman
  244. Ampeg VL502 problem
  245. Power xfrmer wire color? Help!
  246. Could someone explain how this amp was working?
  247. fender stage 100 dsp 112 combo
  248. Peavey KB60 acting up
  249. overheating resistors
  250. please tell me its not a crate