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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Testing a power section without outputs installed
  2. Peavey Vip 1 amp problem with knobs
  3. Ampeg SVT 7 Pro cuts out with vibration
  4. Trace Elliot AH350SMX dcv on output
  5. 50s AMi Jukebox Amp
  6. MARSHALL MG50FX Accident - Help please!!!
  7. Problem with amp tremolo
  8. Bias Question
  9. Replacing a memory battery
  10. Marshall Major mains fuse value
  11. Marshall JCM800 4212/2505 PT
  12. DONíT DO THIS!!
  13. On equipment grounding in a Crown IC 150A preamp.
  14. Peavey Max 115 Bass Issue
  15. Marshall Artist 3203 new PT buzz
  16. Preamp distortion or power amp distortion. How to tell?
  17. Polytone 102 preamp NSKE4093
  18. Any way to add an isolation transformer inside PT-LESS old amplifier?
  19. Ampeg AX-44C Hum
  20. (Any Pro Tips?) Roland KC-550 synth amp with strange F# buzz in tweeters?
  21. Knight tube tester
  22. SWR California Blonde Power Amp Troubleshooting
  23. Marshall Code 50... no power :(
  24. Fender 75
  25. Crest FA901 Power Amp - One Channel Offset and Hum
  26. Power Transformers - Rust. How much is too much?
  27. Jcm 800 Build Problems
  28. Ampeg V3 MTI main fuse rating?
  29. Servicing a VOX Super Beatle V1142 this weekend.
  30. Fender Deluxe Reverb Reissue - Reverb Problem
  31. DSL 401
  32. diode---VHT
  33. Ampeg SVT-II no pro no go
  34. Marshall 6100 30th Anniversary trouble
  35. B688/D718
  36. Replace magnetic connection point on spring reverb
  37. Ideas on straightening a bent chassis on this Pro Reverb
  38. 77 Marshall JMP 50 Lead Mk2 50 Watt Input
  39. Marshall TSL602 Channel Switch cracking
  40. SHS Mixer DC Protection Circuit
  41. GK 250ml amp transistor replacements
  42. Marshall 5210 problem
  43. Brown Box and Biasing
  44. Gallien Krueger potentiometers
  45. Ampeg Portaflex solid state reverb
  46. Ampeg VT-40 Redplating Solution?
  47. Hartke 3500
  48. TC Electronics BH250 Bass Amplifier
  49. Crazy motorboating issue, Fender 5D5. Help!
  50. Ampeg VT22/V4
  51. Modded fender blues junior PPIMV weird problem
  52. Experience with Mesa Studio Caliber noise?
  53. Wonder how long it will be before we start seeing these in for repair
  54. Vox Pacemaker input jack puzzle...help!
  55. Vox Cambridge 30 disaster
  56. Fame VS5012 - Tube amp - High input working, low input not
  57. Hot Rod Deluxe reverb tank spec question
  58. Blackstar HT CLUB 40 Bias Circuit Problem
  59. Peavey Deuce VT low voltage power supply problem.
  60. Marshall VS65R problem
  61. Hot Rod Deville - No reverb, no drive channel, no master volume
  62. Eliminate Line Reverse with Stand-by Lamp
  63. Hartke HA3500 with partially clipped output
  64. Glebert's redneck DIY amplifier defunkification method
  65. Marshall MG101 CFX Front pots not overriding presets.
  66. Trying to get Tek 464 scope up and running. What is this part??
  67. 2 x el84 amp problems
  68. Hotrod Deluxe channel switching
  69. Delta Blues switch replacement folly
  70. Roland Cube 20XL as Dead
  71. Bugera 1960 half volume?
  72. Tube Amp Output into Resistive vs Speaker Loads.
  73. Eden RS210 power caps
  74. Groove Tubes or JJ 12AX7 preamp tube set for Fender Red Knob Twin (hi gain)
  75. Use bass combo as occasional speaker cab
  76. why are these cathode based output tubes drawing so much?
  77. Kustom K200B-4 hiss
  78. Roland Jazz Chorus 120 Problem
  79. Crate Stealth GT50 gain channel volume loss
  80. Marshall 5275 - Buzzing
  81. Red Knob Twin 60Hz hum
  82. Oh sheesh, was that my fault?
  83. Would like to re-use an SS power section
  84. High pitch squeal and ripped speaker noise on Fender Red Knob Twin "The Twin"
  85. Fender Prosonic Noise on Clean Channel after 20 minutes operation
  86. Music Man 112 RD-100
  87. JCM 2000 DSL 50 Low output
  88. Yamaha G50 112 parametric EQ squeal
  89. Hot rod Deluxe
  90. Looking for an signal generator
  91. Speaker repair what is the proper glue
  92. Weird Problem I can figure out...help
  93. Tweed Deluxe
  94. Holy Grail moment
  95. Danelectro Wiring Diagram - Like DC 59 But Without Concentric Pots (Pics Inside)
  96. Ampeg svt-cl salvaging pwr tubes to complete sextet
  97. Any amp techs in north eastern MA area?
  98. Ampeg SVT CL protection relay
  99. Swr sm-900 dc offset
  100. Mesa Boogie MKIV bias issue
  101. 70ís Fender Pro Reverb - AC noise on output, stumped!
  102. Laney LC15R
  103. Traynor YBA-3. in with cooked tube sockes. OT varistors previously removed
  104. Peavey transtube Supreme (NO DISTORTION, NO REVERB
  105. Whoops! Wrong tube
  106. Marshall DSL100 - bogus bias voltage measurement
  107. aa763 vs ab763 how to tell
  108. %&$#-ing Ampeg!
  109. Peavey 70777042 10" speaker
  110. Active floor monitor troubleshooting
  111. Help me diagnose JCM800 with low almost no output.
  112. 1967 Super Reverb sounds harsh
  113. Bronson Melody King
  114. Roland JC-120 BB03539
  115. Is it over? 21NYC Sansamp Bass DI
  116. Converting a 9 pin 1/4" input to a 4 pin
  117. Egnater Renegade
  118. Mystery Circuit
  119. 6BQ5 Cathode Bias
  120. using unused socket lugs
  121. Wow, that's one noisy transformer!
  122. fender Hot Rod Deluxe - silver foil??
  123. Replacement bias trimmer pot for Hot Rod Deluxe
  124. Peavey XR 8600
  125. Marshall 8100 with no sound
  126. legend RnR 50 problems
  127. 1959 Plexi clone sounds harsh after blowing the HT fuse
  128. polygon 102 schematic
  129. Sunn Beta Lead - Distorted, low output
  130. Gallien Krueger Backline 600
  131. Gallien_Krueger 700 rb II short
  132. Kustom 72 Coupe cathode resistors
  133. Carvin ValveMaster VM100 REV A schematic
  134. More filament noise questions
  135. Noisy Ampeg M12-Q
  136. Microphonic capacitors!
  137. Export knob
  138. Bugera 333-212, sound but no power to switches.
  139. AB165 Bassman buzz
  140. Peavey classic 30 speaker confusion
  141. what scares you?
  142. lamp removal trick?
  143. Introducing the C.A.T.T. Beta. (Cheap Ass Transformer Tester)
  144. Series Filament Amp Hum
  145. 65 Super Reverb Reissue Plate Voltage/biasing
  146. 65 Super Reverb Reissue Plate Voltage/biasing
  147. Fender SF Twin Reverb red plating and mains draw
  148. Roland Jazz Chorus 120 chorus problem
  149. Marshall JCM800 2203 (1984) Blowing CT fuse off the PT. Help.
  150. Fender Frontman 25R Very low Volume problem
  151. Hartke HA3500 engaging eq causes reduced sound
  152. Acoustic 125 Low Output
  153. Fender Hotrod Deville crackling at turn on
  154. tremolo problem (6AT6)
  155. Why would anyone put a fuse in seies with another fuse, you might ask? Iíll tell you
  156. AB763 shorted diodes
  157. Reverb Driver Plate Dissipation
  158. Bias probes or Weber bias rite for biasing tube amps?
  159. JCM900 fx loop treble loss
  160. Need help connecting Power to spade connects on my Crate amp.
  161. Conrad Johnson PV5 Preamp Hifi problem
  162. Need help identifying these components
  163. Who Makes This Power Transformer P-tm-p100 40-16922 Made In The Usa
  164. Help a beginner fix a JC-50
  165. Mesa Dual Rec Solo Head hum
  166. SVT 2 Pro Fault Troubleshooting
  167. Mackie 408m half loud
  168. New Rectifier Tubes Pulling massive current.
  169. Can someone tell me what this mess is?
  170. BA115 DC on speaker output
  171. New 5881's in a BF Pro Reverb
  172. Help with Fender Ramparte
  173. Crate BT-25 Noise Gate Issue
  174. Fender Jazzmaster Ultralight - Power amp board
  175. How would you remount this transformer?
  176. Fender Blues Deluxe reverb issue HELP ! I'm going insane here !!
  177. Marshall JVM205H blows HT fuse
  178. Marshall DSL 5C
  179. Source for LDR? For rebuilding trem circuits
  180. VOX AC30C2 volume drop
  181. Peavey PVXp15 crack!
  182. MarkBass LM Tube 800
  183. Replacement Caps
  184. Acoustic 370 troubleshooting help needed
  185. 5F2A Tweed Princeton Assistance
  186. Fender Combo Amp cabinet roof foil. Foiled again!!
  187. soldering those darn Fender RCA reverb cables
  188. Peavey Ultra 60 head producing squealing when it shouldn't
  189. Buying trouble...
  190. Need help choosing reverb tank for amp bought with tank missing (schematic included)
  191. Peavey Classic 20 outputs change
  192. Twin Reverb AB763 PS Question
  193. Gibson GA-25 fuse value
  194. Vox AC30-CC2X Microphonic Chassis--Whadyamean no EL-84 Pwr Tubes?
  195. Come on Marshall, really?
  196. 5F1 Champ- squealing pig.
  197. Loud Hum on Fender Twin Reverb 65 reissue when standby swith is off (play mode)
  198. Is someone using this indicator lamp to communicate from the OTHER SIDE! :surprised:
  199. Loose tube Sockets and retensioning and cleaning versus replacement?
  200. AB763 split cathode conundrum
  201. GK 200rg transformer ?
  202. Peavey MX VTX 112BW - Blowing Power Transistors
  203. Berhringer BX1200 Ultrabass - no output
  204. Peavey XR684F mixer repair issues
  205. Connecting 4 ohms Twin Reverb Reissue 65 Speakers to Red Knob Twin for testing
  206. small gauge shielded cable
  207. Building a simplified Fender Frontman 212R footswitch
  208. Gibson GA19 RVT low output?
  209. bias procedure for deluxe AB763
  210. What does this AB763 reverb mod do?
  211. Need Help with Old MIJ Tube Amp (Univox?)
  212. Amp Jet J12T beating tremolo
  213. Ampeg BA115 blown output section - Thermal problem?
  214. Fender Rumble 500 hisssss
  215. BEDROCK 1400
  216. Amp Techs - What are the useful tools that you've built?
  217. Vox AC30-CC2X Dress Nuts Not unthreading
  218. dynachord PM 1000
  219. Rumble 25 V3
  220. Where can I find Peavey 87478 ICs for a Phasor circuit?
  221. Redplating Fender Super Twin Reverb.
  222. 6505+ blows output fuse on standby. Does not with no power tubes. (
  223. Loose EL84 cathode
  224. I don't hate spring reverbs.....
  225. Vox AD120VT Problem
  226. Fender red knob twin vs Fender twin reverb 65 reissue clean channel with Les Paul
  227. Marshall JCM2000 TSL 100
  228. Vibro Champ hum
  229. Danelectro Cadet 123 needs OT
  230. CROWN XTi4000 AMP WON'T START
  231. Fender 65 Deluxe Reverb.....
  232. JJ capacitors high ESR?
  233. Tube replacement
  234. Ovation VXT pramp
  235. Supro vibroverb tremolo
  236. Reverb Tank Help
  237. Marshall AS80R preamp trouble
  238. Gibson GA-20RVT trem LDR replacement
  239. Help - 5150 Signature Head - Red Plating Every Set of Tubes
  240. Help - BV120H (Crate BlueVoodoo 2nd Gen) - Intermittent Sound
  241. Champ 5C1 vs 5E1
  242. Peavey 300 Bass amp - power section repair
  243. Mesa boogie 5.25 low output
  244. VOX AC 30 VR squiling tone
  245. 1965 Supro
  246. Please help with Sunn SL-260 repair. Exploded cap and blown output transistors.
  247. Cheap Oscilloscope Kit
  248. Aluminum shielding tape
  249. Tube glass breakage
  250. Fender tweed bassman 5F6 no sound