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View Full Version : Maintenance, Troubleshooting & Repair



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  1. faint signal at zero volume
  2. Hot Rod Deluxe - Mystery
  3. Help the newbie with an Encore 65, distorted
  4. Acoustic Control G100t
  5. 66 Vibro Champ needs some help
  6. Video of hum when I switch on the reverb of my Twin Amp
  7. New power transformer issues
  8. Crate BV120H bias?
  9. varistor touble
  10. Crate Palomino v16 Schematic?
  11. PV classic 30 PT?
  12. Sunn 300 T Bias / Balance issues
  13. Marshall JCM2000 has no sound
  14. JCM 800 2205
  15. Mesa Boogie Formula Pre - Relay
  16. Fender cab question
  17. B+ to high on homebrew
  18. Roland JC120
  19. peavey VB2 schematic
  20. Another peavey 400 bh problem
  21. Ampeg B2 Voltages
  22. Fender 'Twin Amp'
  23. Marshall MG 100HDFX-Clean switching?
  24. Line-in confusion
  25. 1968 Duo Medalist switch issue
  26. Vibro Champ Heater Wiring
  27. Amp troubles!
  28. Randall RG200
  29. Where's the best place to buy filters, caps, etc?
  30. Replaced V1 plate resistor, now I am getting squealing
  31. '79 JMP 50. Old tubes cause low bias voltage?
  32. Fender SK 100B pre amp section out
  33. marshall tsl60 switching problems
  34. Your thoughts on Filter Caps.
  35. Mesa Boogie .50 Caliber Amp - Low Output On Overdrive Channel
  36. MIG100 - Replacing output jacks
  37. Crackeling Peavey Classic 50/50
  38. TSL 602 'Squawking'
  39. Gibson GA42RVT repair issues
  40. Blue glow on the inside glass
  41. 62 Ac30 Distorting :(
  42. peavey delta blues ?
  43. Marshall AVT150H channel switch popping
  44. Rivera K-tre too loud and hissing
  45. yamaha G50-112II
  46. Peavey XR1200 Repairs In Progress - Help Requested
  47. Ampeg B-2 Fan Trouble
  48. '67 bandmaster - intinsity pot for tremolo doesn't start working till about 5
  49. crate gfx-212 - bad input?
  50. G1 amp in Case
  51. Rectifier path of travel
  52. Marshall Valvestate 8080 big noise when starting up
  53. Mesa Stiletto problem
  54. Marshall Mode Four
  55. Ampeg SVT 5Pro Schematic
  56. Radial Headbone
  57. Anybody got a gut shot of a Gibson Ranger GA20?
  58. Mesa Boogie 50 Caliber + red plating
  59. Ampeg SVT 4 Pro curcuit breaker
  60. Ampeg BT25
  61. classic 30 with low volume and odd sounding distortion
  62. PV XR400b mixer/amp with 200 H power module low output
  63. Sunn Beta Lead power transistor
  64. Problem with a Mesa Boogie Dual Recifier
  65. mesa boogie 3 channel triple rectifier switching channels by itself , other noise
  66. FRED Diodes For A Kustom 200B?
  67. SF 135Watt: Dropping the B+ voltage, and bias mod
  68. Silly Questions from a Twin Reverb owning DIY Newbie
  69. Need a little help with a Laney Gh100L
  70. Broken amp, need diagnosis help
  71. Roland Jazz Chorus 120 "Schematics needed asap"
  72. Fender Princeton 65 DSP - Low Volume and Hiss
  73. Dead Vibrato: Fender Twin Reverb Reissue
  74. Reverb issues w/ a Peavey Classic 30
  75. Post In Music Electronics - Link
  76. help with a Kustom 200B
  77. Valvestate 8080 issues
  78. ill amp 'crackles' into speaker ?
  79. Acoustic Model 123
  80. Motorboating issue
  81. Fender Acoustasonic II SFX problem
  82. Hartke 3500 relay problems?
  83. VOX AC30/6 TB scratchy static noise
  84. Help ID a Mains transformer for 135W Twin
  85. Signal tracing rules
  86. Fender Hot Rod Deluxe won't play!
  87. Hot Rod Dlx Fizzy artifact!
  88. need help fixing my fender fm 212r
  89. almost a 6G6 build
  90. Tech-Caps???
  91. Crate GLX65 Question; Working Amp w/ no Sound from Speaker
  92. Marshall DSL 2000?? SO confused!!
  93. re:Peavey XR600B
  94. Taking the next step in my builds and repairs.
  95. Swr la series chirps on power up
  96. Tonefullness of one cap over another
  97. Low V supply issue Firebass 700
  98. LANEY VH100r Power tranformer buzz fixed ...
  99. Polytone - blown power transistor
  100. wave -like sounds
  101. marshall avt 150 h
  102. Crate GX-15R doesn't work - Any ideas?
  103. rca soldering
  104. Deluxe Reverb Mod or mix-up?
  105. Fender Twin Hum Hum Hum
  106. Major goof, major problem OT
  107. Crate V50 ?
  108. Ampeg SVT5 Pro
  109. High-Frequence Noise at Roland Bolt-30
  110. What Reverb Tank for a Yamaha Fifty 112?
  111. Power Amplifier Repair
  112. Problem with Fender Princeton DSP
  113. Peavey VTM 60 Blows fuse
  114. clean channel gone on my little Fender Champ 30 - fixable?
  115. Ampeg SVT 5 Pro
  116. redplate/biasing issue
  117. Behringer GMX212
  118. Amp/Guitar Temperature Sensitivity
  119. fizz and oscillation in Peavey Rockmaster head
  120. Classic 50 tube biasing?
  121. i have damaged my Crate VFX,please help..
  122. 6G12-A Concert clone behaving oddly
  123. Roland Cube 60 -- missing reverb
  124. Peavey Heritage VTX Series
  125. Blues DeVille reissue squealling preamp
  126. Substitute GZ34 for 5U4GB?
  127. Princeton Reverb Re-work
  128. No sound from speaker..?
  129. AC at pin 8 on a 6V6
  130. Pot replacement....I got "shafted"
  131. Keeps blowing the fuse
  132. Blues deluxe..same ole' problem
  133. Color coded capacitor
  134. Miscellaneous Question About Amp Damage
  135. Weber 6a14hp buzz when reverb is on.
  136. line 6 flextoneII hd head problem
  137. Ultimate Chorus
  138. Guitar Research T64RS TUBE
  139. Roland Bolt 60 reverb tank?
  140. Fuse Pops - Transformer Dead
  141. Orange rockerverb owners?
  142. Lafayette (or Univox??) U-80A mystery amp
  143. identify a transformer
  144. Bassman 100 - Should it be louder?
  145. Super Champ XD
  146. Amp Tech Needed in So Cal...
  147. Fender Princeton Chorus problems
  148. Marshall MG100dfx
  149. Marshall Super lead 1959 Problem
  150. JTM45 Build Buzz Problem
  151. Svt 4 pro tubes??
  152. Question about Marshall Valvestate 8100
  153. Marshall JMP 50 watt bias
  154. Traynor yvm-1 voice master acting funny - - -
  155. Fender Concert II problem ( preamp)
  156. Sticker on power tubes? Harmful?
  157. Need pot volume control for op pro preamp Ovation Guitar
  158. Marshall AVT150 Blown Fuses
  159. Diodes for a Twin
  160. Hiwatt Classic 50 Crackling when cranked
  161. NOS 6L6 vs Currently made 6L6
  162. More failed Jamicon 12,000u 80v
  163. Fender Super Reverb AA763 Bias
  164. marshall 8080 pot problems
  165. Need help with Fender Twin Reverb
  166. Vibrolux low volume
  167. Slightly off topic, but strange
  168. High voltage on pin 1 of V5 in '67 Super Reverb
  169. Powering vtl5c1 from heaters on SLO 100 ?
  170. Fender Twin loud reverb hiss
  171. Awful noise from Fender Bantam Bass
  172. power noise parkg10r amplifier
  173. HomeBrew Troublshooting Help
  174. Silvertone 1484 help needed
  175. PEAVEY BRAVO 112 crunch channel bad switch?
  176. 78 Crate CR-1R, 72 Gibson G20, 2006 Randall RG 100 G3 100 watt valve dynamic
  177. Ampeg svt cl hum issues
  178. Polytone Mini Brute lll, lV, M-PA
  179. Need help trouble shooting peavey xl-500 mix amp
  180. Serious ?grounding? problem - kind of scary...
  181. Silvertone 1484 diode substitutes
  182. Trouble with Peavey Backstage 110 amp
  183. '67 Ampeg Jet, no trem & high voltage
  184. Buzz/click!-dead when switching off standby
  185. New Matamp schems
  186. Where to get replacement parts for a Fender Twin Reverb?
  187. Phase linear 700b help!
  188. Complete newbie to amp repair
  189. Peavey TNT Fuse blowing
  190. Park G10 amp at 4Ohm Speaker?
  191. Need schematic for a Crate VC6112
  192. Crate Blue Voodoo 120H acting up:
  193. Mesa DC-5, Massive Hum on Clean Channel
  194. My gibson amp
  195. Peavey Classic vtx series- Troubleshooting repair help needed!!!
  196. fender studio lead amp problem
  197. Dear god not the Selmer again... & PPIMV...
  198. Peavey VT Classic 212 Broken Phase Help
  199. Yamaha G50-112 owners manual wanted
  200. marshall atv100 have no distortion?
  201. Palomino V8 loud hum.
  202. 5e3 volume interaction
  203. SWR workingmans 15 Frying resistors
  204. 59 Bassman reissue cuts out after 10 minutes
  205. Crate Vintage 30
  206. peavey 5150 212 won't power on
  207. SVT 350 XLR out HUM
  208. 65 Twin Reverb Vibrato Problem. Please Help
  209. Ampeg SVT-6PRO death & resurrection
  210. Sunn Sceptre
  211. Blue Voodoo clean channel hiss without volume
  212. Peavey Ultra switching pops
  213. peavey400bh
  214. Princeton speaker rattling in the breeze
  215. solder type ????
  216. Randall RG200
  217. Fender Pro Tube Pro Reverb - Dead Tremolo and Noisy Reverb
  218. Fender Bassman
  219. Ampeg VL502 problem
  220. Power xfrmer wire color? Help!
  221. Could someone explain how this amp was working?
  222. fender stage 100 dsp 112 combo
  223. Peavey KB60 acting up
  224. overheating resistors
  225. please tell me its not a crate
  226. 5150iii channel two compressing
  227. Randall RG50TC problem
  228. how dangerous are floating ground amps (old Supro)
  229. volume loss Crate V32
  230. volume loss Crate V32
  231. Fender Stage 100 DSP
  232. Squire Champ 15/Fender Frontman 15(R)
  233. svt 4 pro going mute
  234. VHT Pitbull 50/12 Issues... Help!
  235. Peavey Studio 210
  236. B-52 AT100 very low volume/fuse blows when standby turned off
  237. Behringer GMX212 amplifier problem
  238. anyone have pic of cts alnico 10' speaker?
  239. Peavey Transtube Supreme Schematic
  240. Help me understand
  241. Channel 2 Fading Out
  242. 61 Reverberocket Reverb Problem
  243. More on Marshall TSL100
  244. Switched Tube Consequences?
  245. Can pulling tubes out one at a time help you locate hum?
  246. Burning 6L6 screen resistors
  247. Please help Marshall jmc 800 (2205) loud hum running out of things 2 look 4.
  248. Ampeg B4R Issue
  249. Replacement power transistors for old JC-120?
  250. Bridge Bad, Would You Replace Regulators?