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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Finished most of my cap job
  2. Peavey 5150 Combo Problem
  3. rectifier tube analysis
  4. Peavey 6505+ Lead channel....tone controls not working?
  5. Lost power in Vibrato Channel Bandmaster
  6. Ampeg BA-115 bias too high
  7. Help! Mesa Nomad 45 Reverb Failure
  8. Crate VC50 3x10
  9. Budda VerbMaster??
  10. Roland Space echo: Touchy Reverb
  11. Hartke HA3500 valve preamp no output
  12. marshall JCM 800 Bass series strange problem
  13. Figures, another 5150II blowing fuses...
  14. Question about Pro Reverb OT impedance
  15. GSP5 Digitech
  16. 220uf 100V Filter Cap?
  17. Homebrew HELP!
  18. Fender Stage160 Reverb not working
  19. 60 hz hum problem
  20. Need schematic Ampeg Sj12-R Superjet II
  21. Super reverb behaving crazzzy
  22. Clipping in tremolo circuit
  23. my amp is working like a transducer!!?
  24. Peavey Ultra 120 Plus Head PRoblemo
  25. Blown Fuses
  26. Mesa Boogie Nomad 55 Combo
  27. My 65 Champ losing it's voice
  28. Crate GX2200H - Blowing Fuses
  29. Ampeg V4 bias problems
  30. Fender power transformer european model
  31. Treble distortion
  32. Boogie DC-3 headscratcher.
  33. Need Ampeg Vt-40 And G-15vi Scematic
  34. Sunn 120 Watt valve head, no sound. What to do?
  35. EQ inductor for old Fender
  36. Need schematic for SWR LA 15 combo amp.
  37. Questions re ~1976 Twin Reverb/trashy distortion
  38. Crate BV-60H power but no sound
  39. ESR question Fender reissue Bassman
  40. GK 1001RB no output
  41. This Is Wierd....
  42. Anyone have Trace elliot schematic for GP7SM 200?
  43. Marshall AVT150 OD1 & OD2 are half the volume of the clean and AC Sim Channels
  44. Marshall Jtm 60 615 Trouble
  45. Fender Ultimate Chorus - bad hum
  46. Compu-Bias Meters
  47. Preamp squeaks - basic understanding
  48. Marshall TSL60 - Excessive hum
  49. Marshall Jcm 900 4100 Repair In Chicago
  50. Crate BX-220H problem
  51. Mesa Mark IV Noise
  52. multicapacitor disassembly
  53. Need Schematic for Crate BV6212
  54. Reverb Circuit Question
  55. Minimum Heater Voltages
  56. Tube Amp reverb noise, no vibrato intensity, unknown model.
  57. Valvestate 8080 bass bug
  58. No power to my crate monitor amp
  59. Im proud to say...
  60. problem with the performer 650
  61. Need schematic for Randall RG 50
  62. Is this PT too big?
  63. Line 6 duoverb head problems
  64. lenny
  65. Fender 212 Reverb Not Working
  66. DR Bias and Bypass Caps?
  67. EF86 Users Check this out
  68. old Kustom preamp bias problem
  69. Adjusting 6L6 power amp for 6V6
  70. Mr bassman 100
  71. Reverb tube redplating
  72. ampeg svt2pro
  73. Bad Cat Hot Cat 100/Redplating/eating o/p tubes
  74. Reverb - what is wrong?
  75. solidstate Marshall, bad hum on second channel
  76. Basic Question - Footswitch for Blues Deluxe
  77. Ampeg V4 shorted diodes- primary OT
  78. ChassisBolt holes on a Princeton reverb
  79. Peavey Delta Blues/ Classic 30 Reverb Problem
  80. Beacon output transformer with 9 secondary taps, what ones to use?
  81. Crate BV150HB
  82. help with Fender Performer 650
  83. Overdriving 6L6's
  84. Fender Twin changes volume
  85. Ampeg Jet J-12 Tremolo Problem
  86. just got a new hiwatt and I need help!!!
  87. Do Vibrato circuits suck down output?
  88. Vox AC10 RFI Pickup
  89. Mig100b schem/xformer info
  90. Acoustic 320, low output, what to do?
  91. getting a signal after turning amp off??
  92. OK I screwed up my DRRI
  93. Trouble with Marshall AVT50 Head
  94. Marshall Jcm 2000 DSL
  95. help with a VOX ac30
  96. Ampeg vl-502 tube socket short?/fire
  97. Bassman 70 Hum
  98. Bad PT?
  99. Blues Deluxe - no sound
  100. No Power on Frontman 15R
  101. Help!
  102. BFDR popping sound when STBY switched off and a few small issues...
  103. Fender Bassman 70
  104. Marshall MG 30DFX - faint crackle when turning the effect dial
  105. Peavey 6505+ blown fuse F1
  106. Recapping a Fender DRRI
  107. Help with SoCal 50 Reverb tank
  108. a/c jack for Marshall
  109. low gain and weak output
  110. RE: MG80R-CD schematics?
  111. HD Deluxe & deville + and - supplies
  112. Peavey classic 30 reverb and general sound...
  113. Marshall 8080.... hot resistors
  114. 1962 Ampeg Reverberocket Restoration
  115. Peavey Artist 120 not working
  116. SE el84 triode wired=hum as pentode=no hum ?
  117. Loftech TS-1 power transformer needed
  118. Fender Stage 100 Amp troubleshooting
  119. Input jacks in PCB amp: shorting or not?
  120. Echoplex EP-2 won't record!
  121. DSL100 intermittent total volume fade
  122. Gk 200mb
  123. Workingman's 15 or 12?? Blows Fuse
  124. Reverb won't work on my Twin
  125. Ampeg SVT lll input
  126. Diodes for marshall vs150h TSB
  127. Marshall Valvestate VS100 no sound!
  128. fender twin reissue dead no power
  129. suddenly no sound from my Crate GX-15?
  130. Ampeg SVT-II Bias Procedure
  131. Fender Dual Showman Reverb: Verb and Vib problems
  132. Marshall w/ melted caps next to tube sockets
  133. Rectifier tube arcing.... fuse blows
  134. Can't find 150UFd 300V Ecap
  135. JMP Low Output
  136. Ampeg B-15 voltages off
  137. Roland Space Echo RE 201 Scematics
  138. DSL 401 no sound/weber mini mass
  139. DSL 100 noise
  140. silly grounding question
  141. Volume Fluctuation in Marshall JCM 2555
  142. is this a bad PT??
  143. Marshall Valvestate 8020 - Hums and Crackles
  144. my volume knob is haunted
  145. Marshall MG100DFX problem...?
  146. -340Vdc bias from secondary taps (LONG)
  147. amp making a crackiling at high volume
  148. Problem w/Vox Valvetronix AD15VT
  149. ampeg v-5 not loud at all
  150. Gibson Super Goldtone 30RV blowing fuses...
  151. Adjustable Bias on Rivera Chubster/Clubster
  152. Looking for amp rebuild advice please
  153. Hissing problems Sovtek mig 50
  154. Marshall TSL100 Head Problem
  155. can you overly capacitate power supply?
  156. Deluxe Reverb RI Bias Puzzle
  157. 6AQ5 substitutions
  158. baddog
  159. Which Driver
  160. peavey classic 60 trouble
  161. Marshall JTM30 mystery
  162. TNT-100 Repair Problem 2
  163. "Dual Professional" Fender 2 Button LED Footswitch - Why not?
  164. dimbulb tester is glowing bright
  165. Need help with a speaker problem.
  166. randall 1992 12" guitar amp noise cutting off
  167. Ashdown Peacemaker 60 Head
  168. never mind
  169. Ampeg Reverbrocket blowing fuse
  170. Help with Peavey XR600B
  171. line6 pro duo hummmmming.
  172. low gain on ef86 gain stage problem
  173. 1973 Fender Princeton Reverb Vibrato Noise
  174. Dropping B+ before filter caps
  175. marrshall valvestate 8200 bi chours
  176. Marshall 1959HW has low volume
  177. Does Marshal PED081 work with Roland JC-120
  178. Marshall JCM900 4100
  179. question on a Framus Dragon Amp 100watt
  180. Fender Super 6 Reverb squeal
  181. Marshall 2959?
  182. .33 Ohm emitter resistor instead of a .22 OK?
  183. SWR combo
  184. Please help!!!
  185. What do you do when a customer brings you an amp with an intermittant problem...
  186. jcm 800 wierdness
  187. Valvestate 8080 Troubles
  188. Humming Vox AC30 reissue that dies down when 'normal' vol is at 1'o clock
  189. trouble sourcing restistor
  190. Marshall Valvestate VST50 Transformer
  191. Fender Stage 160 amp problem
  192. Marshall JCM 900 making a crackling noise
  193. trying to understand power transformers
  194. Biasing Peavey JSX
  195. Hummmm help
  196. Oops!Shorted something!
  197. Pace MBT-100 heater
  198. How to take apart a Micro Cube?
  199. Behringer k3000fx amp
  200. solid state amps howling
  201. Carl Zwengel, where are you?
  202. Gibson Falcon output transformer
  203. Fender M-80 Chorus Troubleshooting
  204. Output transformer for a Magnatone 108
  205. mesa boogie 20/20 schem
  206. Thanking you kindly
  207. PV CS1000X schematic and layout
  208. A few questions about a Fender Twin II
  209. Fender Champ 5C1
  210. Hartke HA4000
  211. Peavey PV2600 Power Amp
  212. Marshall 2205 JMC800 Reverb does not work
  213. Help Fix Marshall Valvestate 10 Volume
  214. Tube amp Question
  215. Replacing Molded Paper Capacitors
  216. SUNN Concert Bass
  217. fender blues junior help
  218. Peavey Ultra Plus - pull tubes?...
  219. Output Transformer recommendations
  220. Fender Transformer info
  221. DC Indicator lamp?
  222. Ampeg SR-212rt Issues
  223. Fender Hot Rod DeVille 410 sharp noises with high volume levels
  224. Fixed Bias?
  225. Hammond OTs as replacement
  226. eico 666 tube tester
  227. Sunn Beta Lead Restoration
  228. Ampeg Jet LDR Replacement
  229. Questions about old Univox amp
  230. Dead in the water Princeton Reverb Amp
  231. XR600B IC4741cp
  232. GK 200M trouble...trouble.
  233. Help with Spectrum ll
  234. Marshall 1987x issues....
  235. Peavey Unity series 1002 mixer take apart..
  236. newbie stereo/mono question
  237. Ampeg G2-12 Test points & troubleshooting help
  238. red knob the twin clean channel....
  239. Twin Amp current
  240. carvin r600 mosfets
  241. Question About Proper Use of Variac
  242. Transformer recommendations
  243. Bias question
  244. Fender Custom Vibrolux Reverb - Vibrato dead...
  245. Antique Electronics Marshall OT
  246. Merrell MA-12
  247. Crossover cutting out in Crate PS 118 subwoofer
  248. Marshall JMC900 100 watt
  249. Buying a variac: advice needed
  250. Vox AC30 CC1 Reverb