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View Full Version : Maintenance, Troubleshooting & Repair



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  1. What did I do wrong?
  2. Cornford Carrera - Crackling/hissing
  3. Mesa Boogie Duel rec. 3 ch. solo head with no power amp output
  4. Getting bias vltage from a non-centertapped secondary
  5. hartke 3500 power-on problem
  6. '84 Marshall 5005 Lead 12 power switch
  7. Tremolo Not Working-1972 Super Reverb
  8. fender stage 100 amp buzzing
  9. Laney becomes intermittent after two hours...
  10. Help with Carvin Legacy please - newbie
  11. Bassman 100 grid leak and bias Q's
  12. Hookup wire
  13. Noisy Princeton Reverb Clone
  14. Hot Rod Deluxe Master Pot
  15. Output wattage opinions?
  16. newbie help with marshall amp please
  17. '74 Pro Reverb with hum and reverb noise
  18. Removing powertubes and running
  19. Need Help with Fender Twin Reverb
  20. Power supply for a preamp
  21. need help with a resistor value
  22. Help with Marshall Please
  23. noise peavey classic 50
  24. Peavey XR 600E repairs
  25. nmv twin reverb vibrato
  26. Fender Twin-Amp Feedback
  27. Laney LC15 problem
  28. level dependant buzz/static
  29. 1964 Gibson GA17RVT "Scout" volume......
  30. Marshall 8004 Woes
  31. Trace Acoustic TA100R Schem.
  32. 1973 Princeton. Low volume.
  33. why is SFDR picking up more buzz than BF Bassman?
  34. Deluxe Reverb Stock Speaker Trouble
  35. Peavey Classic VTX
  36. Carvin BelAir - Low Voltage, Output, lot's of problems
  37. PREMIER AMPS B-160 and B-220
  38. My new Mesa Boogie Mark III Red Stripe
  39. Belgiums bitch
  40. Got a fender blues deville mexican, fixed a few problems but reverb feedsback bad.
  41. Marshall Haze 40C Tube 4 turns sign wave into hard very loud sq. wave to early,ideas?
  42. piezo preamp
  43. Vibro Champ not Vib-ing
  44. Deluxe Reverb Reissue Hum Issue
  45. Kustom 150 power supply 50% high
  46. Vibro Champ from parts... B+ voltage low, 155v
  47. Fender Footswitch trouble
  48. Amp Hiss
  49. AC30 TB/6 Vib/Trem Controls
  50. VOX AD100VT Troubleshoot
  51. plugging 8 ohm speaker into super reverb
  52. PV XXX channel sw problem
  53. Deluxe Reverb Power transformer - 0990761
  54. buzzing amp
  55. Mode Four smokin' but with real smoke!
  56. Ampeg SVT4-Pro Problems
  57. Peavey 130 Hum
  58. Crate Vintage Club 50 Head Is Hissing and Crackling
  59. trouble with ashdown evo2 300 and trace elliott gp7 amp heads
  60. Fender Squier 15 input jack
  61. Peavey Vypyr 15
  62. mesa problems
  63. Behringer ULM2000 microphone
  64. switch for an Ibanez TS9
  65. 5V4 in Champ
  66. Testing an output transformer
  67. CS800 Proper Schematic
  68. Hiwatt 200 problems
  69. Old Pro Reverb
  70. Help with output transformer
  71. Roland cube 100 guitar amp- loss of power
  72. Marshall g100rcd smoke checked?
  73. Is this "Crossover Distortion"?
  74. rattle in GT EL84s, again!
  75. Fender Showman output?
  76. Yamaha T100C
  77. Peavey Stereo Chorus 400 footswitch circuit needed.
  78. Marshall MHZ40C - Buzzing
  79. My Classic 30 DIED!!!
  80. Behringer GMX110 fried power amplifier
  81. Echoplex EP2 Hum
  82. How I "safely" use 2-prong amps until I change to 3-prong!
  83. Low voltages in 1972 Orange Graphic 80
  84. Need help! channel and crunch switch not working!!!
  85. need diagnosis help for dead amp
  86. Bridge rectifier issue...
  87. Mig-50 PI type parasitics after a few hours
  88. Fender Princeton Chorus
  89. Peavey Bass 400 m3 DC on Output
  90. Ampeg B-15T distortion
  91. Unidentified Model
  92. peavey 5150 sounds bad
  93. Vibro Champ Rebuild - Plate voltage high
  94. Bugera 333xl sounds bad suddenly
  95. Crate GTX212 Squeals on power up
  96. Crate PX-600 Whistles when turned off
  97. G1 amp in a Case
  98. Fender Frontman 15G 60hz Hum
  99. Peavey Vypyr 15 problems
  100. Carlsbro top 50 OT installation
  101. Help with Peavey Bravo
  102. Traynor Bassmaster Tubes
  103. Hum in DIY preamp
  104. Yamaha G50 112
  105. Sunn concert bass repaires
  106. NO sound out of 30 watt Peavey Delta Blues!
  107. Ruby EL84
  108. Quiet champ, blown OT?
  109. Need help yesterday
  110. Yamaha fifty 210, G50-210
  111. Diagnose a cheapo amp?
  112. Old Amp Hum
  113. Noisy presence pot
  114. Vintage Ampeg SVT troubles
  115. Trace Elliot SuperTramp Twin losing power
  116. Bassman reissue problem
  117. Gibsonette 6V6GT Biasing
  118. Traynor YGM-replaced filter caps/NF mod and now volume works strange...
  119. Fuzzy signal to speaker on Peavey Nashville 400
  120. Tube holder for Peavey Classic 30? Hmm, I wonder if there is suc a beast??
  121. Fender "The Twin" noise in channel 2
  122. help with Fender PD 150 Deluxe (Passport POS)
  123. Fender Reverb FR 1000
  124. Crate GT-50H Combo Amp
  125. Another Marshall MG50DFX with no sound...?
  126. Power Transformer Heat
  127. Glockenklang Soul
  128. Marshall MG250HDFX No Output
  129. Was given a Marshall MG 50DFX but no volume
  130. Marshall JCM 2000-DSL50 output issue
  131. Marshall Valvestate VS30- Hum/No Output
  132. Marshall 8080 - Lack of volume on boost channel.
  133. Shorted Transistors in a Crate PX-600DP
  134. encore 65 - problems/distortion/reverb
  135. Peavey 5150 has lost it's Gain... Help
  136. JCM 600 bias problem
  137. Amp tune -up?
  138. Mackie SWA 1501 fuse blowing
  139. Phase Inverter Test
  140. Please Help troubleshoot Vibroverb
  141. Yamaha G50-112II DC Board
  142. Hughes and Kettner Trilogy switching
  143. 67-68 Bandmaster
  144. Crossover part please
  145. Crate Vintage Club 50 causing fits
  146. SF Bandmaster L.F. Oscillation
  147. CARLSBRO GRX7 MIXER PA AMP INTERNAL FUSE BLOWS Help Please
  148. Audible oscillation while plugged into dummy load
  149. buying tube ?
  150. help with fender deluxe 90 dsp
  151. Fender Hotrod Deville prob.
  152. hum problem in swr basic black
  153. Super Champ XD Stuck On Channel 2
  154. Appreciat Diagnostic Help for Old Roland Orange Cube-60 Guitar Amp
  155. Help: Removing cap cans heavily soldered to chassis on Traynor YGM-3
  156. AVT150H Valve Replacement
  157. Vox JMI AC30 (1964) Servicing
  158. Schematic for Lexicon Signature 284
  159. Fender Deluxe 112 problem (cracking/popping)
  160. are my tubes matched or not ?
  161. dsl 401 no sound
  162. Orange Rocker 30 Head Case
  163. Half Tube Tremolo/Vibrato?
  164. Finding tube sockets with 1-3/8" mounting center
  165. Replacement diodes for Reverbojet rectifier
  166. Can I Super Glue A Loose Tube To It's Base?
  167. Fender 'Twin Amp' c2002
  168. Death cap
  169. AVT150H, fuse and resistors.
  170. Ticking in Princeton Reverb Tremolo...
  171. Hartke 3500 power amp module - any replacements?
  172. Bias current vs class op question.
  173. Fender Cyber Twin no master Volume
  174. Ampeg SVT 6 Mosfets
  175. capanalyzer 88 series 11
  176. Popping Fuses. Op-amp replacement question...
  177. help!(faulty behringer bx1200)
  178. bugera 333xl effects loop problem
  179. Hiwatt Classic 100 power section
  180. Dual Marshall Footswitch
  181. troubleshooting Fender 3016 amp
  182. Hot rode deville no sound
  183. The Marshall AVT50 R58 problem
  184. Sovtek Mig 50 shorted tube.
  185. microphonic chassis problem
  186. Peavey bandit 65 feedback problems
  187. Behringer vintager GM110 troubles
  188. Soundcraft GigRac 1000ST, major problems ? blown?
  189. Blinking Channel LEDs with side of noise
  190. Converting: 220 - 117V
  191. 1976 Fender Champ hums 60hz always
  192. SWR Silverado power-up problem
  193. Crate V-33 Do any of these last?
  194. Help with IORIO amp problem/output tranny?
  195. Evans amp schematic ?
  196. Lord Valve where are you?
  197. "Blows Fuses" and "Is my transformer dead?"
  198. Marshall AVT 50x OD channel problem
  199. SWR Bass amp fan issue
  200. Speaker Ohms Question
  201. AMpeg SVT-CL Unholy Noise
  202. Crate Vintage Club 50, Input Jack Issues?
  203. Peavey Stereo Chorus 212 Schematic?
  204. ID this part ?
  205. Danelectro DM10 thumping
  206. Ampeg SVT 4 T schematic??
  207. HELP with wiring a Teisco Checkmate CM-10
  208. Old Fender fiber boards
  209. Old Fend. Transf. Primary Colour Codes
  210. Configurable Dummy Resistor Load Box for Amp design/repair
  211. Amp trouble
  212. Schematic Request Peavey Envoy 110
  213. Connecting a 110V amp to 240V - possible?
  214. B-15 Crackle
  215. faint signal at zero volume
  216. Hot Rod Deluxe - Mystery
  217. Help the newbie with an Encore 65, distorted
  218. Acoustic Control G100t
  219. 66 Vibro Champ needs some help
  220. Video of hum when I switch on the reverb of my Twin Amp
  221. New power transformer issues
  222. Crate BV120H bias?
  223. varistor touble
  224. Crate Palomino v16 Schematic?
  225. PV classic 30 PT?
  226. Sunn 300 T Bias / Balance issues
  227. Marshall JCM2000 has no sound
  228. JCM 800 2205
  229. Mesa Boogie Formula Pre - Relay
  230. Fender cab question
  231. B+ to high on homebrew
  232. Roland JC120
  233. peavey VB2 schematic
  234. Another peavey 400 bh problem
  235. Ampeg B2 Voltages
  236. Fender 'Twin Amp'
  237. Marshall MG 100HDFX-Clean switching?
  238. Line-in confusion
  239. 1968 Duo Medalist switch issue
  240. Vibro Champ Heater Wiring
  241. Amp troubles!
  242. Randall RG200
  243. Where's the best place to buy filters, caps, etc?
  244. Replaced V1 plate resistor, now I am getting squealing
  245. '79 JMP 50. Old tubes cause low bias voltage?
  246. Fender SK 100B pre amp section out
  247. marshall tsl60 switching problems
  248. Your thoughts on Filter Caps.
  249. Mesa Boogie .50 Caliber Amp - Low Output On Overdrive Channel
  250. MIG100 - Replacing output jacks