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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Contessa PA-55R owner's manual or know what the speaker impedance could be. Thank You
  2. Bugera 333XL
  3. Fender Powe Chorus output stage oscillation
  4. Laney VC 50
  5. 2 layered 5-way rotary switch needed
  6. Blue guitar mod on Classic 50
  7. Ampeg SVT-CL
  8. Bugera 333XL input jack...
  9. How to sub out a power transistor?
  10. Fender SuperChamp XD- No Sound but panel lights are on Need help trouble shooting
  11. Fender Hot Rod Deluxe Switching problems
  12. classic 30, no sound, funny voltages
  13. Peavey Triple X trouble
  14. JCM2000 TSL Power Transformer
  15. B-52 LG-100A Gain 2 Channel Problem (quiet, muddy)
  16. Marshall MG100HDFX Footswitch control circuit problem
  17. replacing input jacks
  18. 1962 Vibrolux squealing
  19. A Little Engineering That I Appreciated
  20. Mesa Boogie Subway Rocket - Low output
  21. Hafler T3 hum
  22. Gulbransen(Seeburg) Select-a-Rhythm white noise
  23. Electronic Tech needed / Job offered ...
  24. Dancing scope traces
  25. Beringer PMH3000
  26. Fender bassman 100 blowing fuses
  27. Laney LC15R - have I got sympathetic oscillation ?
  28. Peavey XR800D Powered mixer loses power
  29. Hughes and Kettner Switch Blade 50 blowing fuses
  30. Dummy Load and chassis rack complete
  31. Autotransformer tap question
  32. Peavey VIP 1 voltage change
  33. What function(s) do these resistors play in this heater circuit?
  34. Peavey Mark VI bass amp: Compressor not working
  35. Reverb Tank tranny resistance
  36. SWR SM-900 replacement fan?
  37. Replacing a 2 wire cord with a 3 wire one
  38. Peavey Musician III (400GH power amp) buzzing & no output
  39. fender silverfaced super twin new speaker reqd
  40. About Storing Tube Amps/Tube gear
  41. So I Blackfaced the Twin ,and I have a few issues.
  42. Line 6 guitar floor processors
  43. Damaaged speaker???
  44. The dreaded hum
  45. JMP-1 Power trans source?
  46. Flashover damage
  47. Peavey Valve King - No Heaters
  48. Wirewound Resistors Dummy Load question
  49. peavey triumph 60 new pot needed
  50. Is this even possible
  51. Mesa Boogie mini rectifier problem
  52. Schematic for Ampeg B500DR
  53. Problem with 5F4
  54. Fender Hot Rod Deluxe PT and noise questions
  55. Crate GX140C preamp problems
  56. Apogee Rosetta 200 A-D / D-A converter rack mount
  57. Peavey Classic 30 eating Preamp tubes.
  58. Digital Oscilloscope, which one?
  59. Capacitor Plague- Industrial Espionage Incident Ends in Manufacturing Catastrophe
  60. Fender Hot Rod Deluxe hum
  61. sorry.. deleted
  62. Help with ID of a power transformer...
  63. Line 6 Spider Valve 112
  64. Traynor YGM-1 trem clicking
  65. Traynor YGM-1 trem clicking
  66. Sloclone..hums like h...
  67. fender frontman 212 distorted output
  68. 6L6GC from TubeDepot, PSA and questions.
  69. Silverface Champ making noise when played...
  70. 5E3 scratchy sound
  71. Blues Jr 3 Texas Red
  72. Using the oscilloscope
  73. Can this amp be fixed?
  74. First trip to tube amplification.. That's broken.
  75. Peavey classic 50?
  76. Princeton Supply Side Economics
  77. 3 Prong Conversion On Solid State Amp and advice on Output Transistors?
  78. THD Flexi 50 Repair. Any advice appreciated.
  79. Fender amp cabinet grounding foil replacement material
  80. Kustom Defender 112 DC Filaments
  81. Traynor YCV40 Strange Vibro Sound
  82. Fender Twin 135 Watt with on/off master volume switc (6L6X4)
  83. Blackstar Stage 60. No sound
  84. sunn concert lead trips circuit breaker
  85. damn, that's a shame!
  86. The dreaded Acoustic G100/60T channel switching problem
  87. Early 60's Ampeg Reverberocket: need help with noise
  88. Peavey TNT-100-79
  89. Trace Elliot GP7SM 130
  90. SE5a power transformer help?
  91. valve king 100 died mid set
  92. Vox AC100CPH Reverb Problem
  93. Gallien-Krueger MB150S III resistor values
  94. Bogner Shiva blown supply protection components
  95. Valvestate 8200 volume fade
  96. Sunn oscillation?
  97. Yamaha PSRS 650 keyboard
  98. Reverb on Twin Reverb Reissue stopped working while playing
  99. Hotrod Deville Fuse Size
  100. Power fuse mod
  101. Rickenbacker TR35B....low distorted output
  102. Peavey Classic 30 oscillating
  103. 5F10 Fender Harvard Clone Pulsating (HQ Video/Audio Included)
  104. Peavey JSX problem
  105. desoldering double sided boards
  106. Blackstar Head pots scratchy
  107. Behringer gmx212 problems with volume knob
  108. Quick question about BJT transistor
  109. Another Champion 600 help thread
  110. Dynacord powermate 1000
  111. Fender Super Champ X2 smoking resisitor
  112. teisco checkmate 50 power switch
  113. A.R.T. Voice Channel Mic Pre (Rack Mount)
  114. Fender 68 Custom Deluxe Reverb
  115. Fender Hot Rod Deluxe
  116. BUGERA 333XL randomly shut off PLS HELP
  117. Knight 400 tube checker
  118. Looking for unusual jack from Epifani amp
  119. Looking for 8 pin tube socket adapter that can be dismanteled
  120. Looking for alternative to Peavey dual diode SZ-13886
  121. Fender Silverface Super Six Recap Job
  122. My Latest Score - 1974 Silverface Vibro Champ
  123. Sano 300R Tremolo Problem
  124. What insures voltage balance on stacked pairs of PS Filter Caps?
  125. Is this possible?
  126. Phase inverter tail resistor burned/smoke
  127. Carlsbro Marlin 6-300 Mk II
  128. New 2203 Hum Balance
  129. Marshall JCM2000 DSL Superlead 100 DSL - PWR Transformer Shorted?
  130. M Taper or Special Taper pot question
  131. Phonic Helix 24 Firewire Mk 1? " Firewire issue "
  132. Blues Junoir reverb dead
  133. Rectifier voltage shifting when standby switched on
  134. Sub for BA 4560 opamp
  135. Blast from the past... Flo-a-tone
  136. SRRI one output tube inactive
  137. Session 400 again and again
  138. 1974 Celestion Creamback with a 70s Waldom recone question
  139. 1981 Peavey Special combo amp question about filter caps
  140. MG100 HDFX no power HELP!!
  141. Park 75 Bass Amp Biasing Question
  142. Center-tapped pots?
  143. Ghost notes or what? (video)
  144. ANOTHER dead valvestate !
  145. Mackie SWA 1801 Service Notes
  146. Blues Junior distorted and low volume
  147. Behringer Euro Live B1800D PRO 18" subwoofer help SMPSU28 and P0981 pcb's
  148. PV Session 400 LTD...again
  149. stereo/mono cab wiring jacks?
  150. Swr 750x pre-amp problem!
  151. Behringer BXL1800A problem
  152. AC Voltage Measurement - Hum Reduction
  153. Ground Loop???
  154. Would You Guys Replace This OT?
  155. Marshall Preamp
  156. Fender FM65R distorts after 1/2 hour
  157. Peavey special 130 pop on clean channel
  158. Carvin Legacy (105 hz hum?)
  159. Sunn Concert Bass shutting off
  160. Vox AC 30/6 TP Potentiometers Supplier
  161. Fender blues deville foot switch problem......
  162. Gibson Invader red plating
  163. Marshall B150 -56vdc on speaker output
  164. Blackstar HT-5 barely any output
  165. 3 prong on tube tester?
  166. Egnater Rebel 20
  167. peavey kb300(nothing)
  168. Fender Stage 100 transformer wiring. I think I hooked it up wrong.
  169. Peavey Vyper 15w Modeling Amp only works through headphone jack
  170. Looking for Ampeg socket
  171. '65 Fender Deluxe - One 6V6 cherrying and I'm stumped
  172. Tube tester shot craps?
  173. Peavey Bass-Fex battery type?
  174. Help me with OLD tube amp!
  175. Super Reverb Volume Controls won't Silence the Guitar
  176. Looking for Ampeg SVT CL resistor
  177. Weird feedback---Crate
  178. Peavey Rockmaster Preamp Static Sizzling Noise
  179. cant find parts???
  180. Ampeg B100R Static Under Notes
  181. hartke 3500 troubles
  182. Randall RH200 strange noise??????
  183. Behringer pmp4000 blinking lights no sound
  184. Hot Rod Deluxe Caps - replace all at once?
  185. Laney TF 300 tone problems...
  186. Hot Rod Deluxe issue
  187. Need help determining ratings for rectifier diodes on a Supro S6625
  188. Crate VTX212 Loud Hum Whe Instrument Plugged In
  189. B212D Schematic Needed
  190. Univox U-1075 PA amp
  191. PV ValveKing Combo dead
  192. microphonic EH KT90's
  193. Bugera 6260 changing stock tubes to JJ 6L6's
  194. Output Transformer Impedance Verification
  195. Hot Rod Delux repair/mods
  196. Peavey TNT 150 Hum Problem
  197. Yamaha G50 112
  198. Phase inverter tube?
  199. Peavey Ultra plus quiet on crunch and ultra channels
  200. Hiss/Crackle in a Marshall 1959 Super Lead head from 1969
  201. Sovtek 6L6WXT
  202. Yamaha g50-112 II troubleshooting
  203. Polytone 103 Reverb Problem
  204. Marshall valvestate 8200 bi chorus problem!
  205. Mesa 2:90 power amp channel B distorted
  206. Here's a good one.. Ruby Tube quality fail.
  207. 1961 Supro 1624T Low Volume Issue. Need to trouble-shoot.
  208. 2 to 3 prong conversion for Fender Champ no ground switch
  209. Fender Twin Reverb (ab763) motorboating?
  210. PT centre tap floating via resistor?
  211. Do you need all transistors need Mica Insulator?
  212. JMP100 Transformer and Cap
  213. Rebuilding a Marshall 4x12B cabinet...
  214. Music Man Heater Current
  215. Standel Transistors
  216. Magnatone Noisy PI
  217. Peavey Classic Tremolo Circuit Not Working
  218. Fender Blues Deluxe Reissue clean channel Noise.
  219. Traynor - YGM-2 - biasing issues
  220. bassman 12at7 phase inverter to 12ax7
  221. EMC Scorpio ???
  222. Matchless Chieftain Oscillating
  223. Haunted by David Eden
  224. Kustom K150 noise in channel 4
  225. Gibson Hawk questions
  226. 5e3 circuit too boxy/brittle?
  227. 86' jcm 800 2210 big hum in fx loop
  228. Nashville 400 DDT
  229. Magnatone Starlett Dead
  230. Fender Hot Rod Deluxe PT Issue
  231. Old plexi Calsbro very low volume
  232. Hughes & Kettner Switchblade 100 head FU2 Fuse issue
  233. transistor number
  234. Behringer PMP6000 - no L channel output
  235. kustom k100-0 pc103 driver transistor substitution help.... HELP
  236. SVT Plate resistor value
  237. PT explanation please
  238. Polytone 103
  239. 1972 Peavey 400 series power module - I'm in over my head
  240. Fender Frontman 212R - loud popping and crackling
  241. H&K Triamp MK II neon lights not working
  242. Vox AC30C2
  243. Tweed to BF tone circuit output loss
  244. Toroid Taps question
  245. Gibson GA45-RVT low power
  246. low voltages with 5y3 and fender original 5e3 PT
  247. AC15 Hum issues
  248. Vintage 1973 Pignose 7-100 sounds muddy (solid state)
  249. Ampeg B100R power transistors saturating
  250. EL84 current draw help