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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Crosstalk between gain stages of Mesa Road King II guitar amplifier
  2. Fender optocoupler
  3. Blackfacing a 74' Bassman 10
  4. Best way to wire an idle preamp tube half?
  5. Earth Amp BT-2000 Bass Traveler Bridge Rectifier Issues
  6. Can't solder headphone speaker wire correctly
  7. Problems - 30watt JTM45 kit
  8. Deluxe Reverb Build - noisy vibrato and slow response to vibrato pedal
  9. PV Delta Blues intermittent "howling"
  10. Recommendation for Class D Amp book
  11. Peavey Delta Blues w high freq osc.
  12. Sunn Beta Lead has 40 v DC on speaker out jack
  13. BadCat - Classic Cat - Hot! Hot! Hot!
  14. 1976 Fender Vibrolux Hum after minor repair.
  15. Valvestate 8240 troubleshooting
  16. fender stage 100 head loud input hum
  17. 6L6GC in Kt88/6550 place?
  18. Gk mb150s not powering on
  19. Kalamazoo Model 1...how to make it brighter?
  20. Trying not to walk away from Mark Bass Little Mark Tube 800 repair
  21. Peavey Valveking V112 Lead Channel Out
  22. 1973 Twin Reverb...Reverb Circiut. Running Out Of Ideas
  23. Fender Ultralinear SR 6v6 mod
  24. Crate gtx65
  25. Crate G-20: "input" produces no sound, but plugging guitar into footswitch does
  26. Fixing a Fender Champion 30 Amp
  27. Ampeg Jet fizz J-12D
  28. Bugera 6262 crackling/power amp board issue...
  29. Hartke HA 3500 Transient attack
  30. Marshall MA50C input jack
  31. Bugura 333XL Combo Issues.
  32. Anyone else walking away from repairs?
  33. Peavey Bandit 112 really loud feedback for no reason
  34. Fender performer 1000
  35. New 15" bass speakers CA154 vs BL15-300x
  36. AC Voltage on the B+ rail
  37. Traynor YCV40 Low Output
  38. Peavey 5150 II Plate voltage too high?!
  39. B-52 ATX100 Low Power Output
  40. Peavey Bass Version B
  41. Fender Stage 185 Losing Sound, Until I punch It On the Noggin
  42. 68 Fender Bandmaster Reverb help needed
  43. 1968 Fender Bassman- Serious Volume Loss
  44. JBL EON 515-XT repair
  45. Crate Blue Voodoo 6212 HELP NEEDED!!!
  46. nfb issue
  47. Need a channel switching PC mount switch for a Crate GX80.
  48. Squeal/Siren noise Silvertone 1481
  49. repair TKO 115 Bass Amp
  50. Fender 212r repair: distorted sound output and bump on power on
  51. Blackstar HT Studio 20 power transformer
  52. Princeton Reverb - hum but no reverb
  53. .22 cap on Impedance Selector Marshall/Splawn??
  54. Ampeg SVT CL reliability/tech recommendation
  55. Laney RB9 +HT rail dropping. Last ditch attempt!
  56. Peavey Bandit 65 Speaker replacement recommendation
  57. Vox Buckingham Tremolo Problem
  58. Fender Hot Rod Deluxe - persisting issue after replacing components
  59. Redmere Soloist Footswitch Mystery
  60. Symptoms of a bad cathode bias resistor '68 bassman
  61. Mesa/Boogie Maverick repair nightmare
  62. Fender DRRI FS wiring
  63. Jet City 20 combo Troubleshooting
  64. Mark Bass cmd151P schematic?
  65. Musicman 2275-130 - tremolo issues revisited
  66. Amp popping noise when switching pickups
  67. Marshall JMP 50 watt model 1987 confirmation please
  68. Gallien Krueger 1001RB ... R61???
  69. Marshall tube codes
  70. Fender Super 60....Reverb circuit feeds back with volume at zero.
  71. Traynor YCV40 Issues
  72. jcm900 4101 4x5881 pc0112 1kohm screen resistor.... doh!!
  73. Help clean up RI fender Super Reverb
  74. Newbie Question: Death Cap in Vintage Fender 3 prong corded amp
  75. Silverface Twin Reverb: Reverb pot adding distortion
  76. Fender Princeton 650 Troubleshooting help
  77. tbrsl1
  78. Fender Performer 1000 distortion channel
  79. Peavey KB-1 DC on Output
  80. 1968 Fender Bassman refreshing some components.
  81. ENGL Savage 120 with weird grounding issue
  82. Premier 76 temolo not working
  83. Cap job for Fender 5e5-A with Astron Caps?
  84. blackface deluxe reverb 1967 farting bass
  85. 6505+ Head "motorboating"
  86. Someone tell me what caused this valve to look like this please?
  87. Vintage Ampeg V4 Rice Crispies
  88. Sound City 120 Bias Doubler
  89. carlsbro twin amp 90 guitar - help i am an idiot
  90. Peavey 6505+ preamp tubes not glowing faint sound
  91. Crate GTX65 Bad Input Connection
  92. Carvin Pro Bass 500 Bridge Mode
  93. Ampeg B115 DC on output
  94. Ampeg B115 DC on output
  95. JCM900 Model 4100 100W Head - High Pitch Squeal
  96. Issue with turning off JCM 2000 TSL 100
  97. Pro Jr 3 Issue's
  98. Fender Bassman 200 with DC on output
  99. 6FB2D Reverb Tank Issue
  100. Merry Christmas from Canada
  101. keeping cleaned pots quiet
  102. Mesa Mk4B volume varies in Lead channel...
  103. Solid state problem - Fizz? Static? Distortion?
  104. Mesa Nomad 55
  105. BUGERA 333XL Homemade cable for switching amp wihtout FSB104
  106. '69 Super Reverb Oscillating
  107. 6550 shorted plate to filament -- possible causes?
  108. Peavey 6505+ Combo Lead Channel Issue
  109. Silvertone 1474 twin twelve intermittent output
  110. Gibson GA-100 amp is a troublesome critter...
  111. Filter cap size question. Fender blackface.
  112. Wild Oscillation
  113. DRRI bias sweep.
  114. 6L6s in a stock princeton reverb RI
  115. Earth Sound Research Revival driver stage issue
  116. Princeton Reverb RI speaker jack question
  117. Cornell Dubilier caps- date and condition
  118. Help! Weird Noises and No Guitar Output from Sunn Solarus
  119. Marlborro (Sound Works) Model SRA920 made in the USA
  120. Rickenbacker M-14-A Mysteries
  121. Mains TX outputs for Line 6 Spider 4 anyone?
  122. Swr red head fuse blow both fuses
  123. Fender princeton 5C2 low volume
  124. Fender Blues deluxe distorted sound
  125. marshall B65
  126. New amp problem: treble pot not doing anything
  127. low volume outpout
  128. Mesa 8:88 mute circuit
  129. Weber 5e3 x2 sound cut
  130. Silvertone 1484 Reverb Noise Issue
  131. Silvertone 1484 Noise Issues
  132. Drive Channel Volume Problem (Bugera V55)
  133. A Not so charming Beringer Eurolive B212D Dead, and needed for Gig 2Nite
  134. Laney L20H - I'm looking for the schematic
  135. am i reading thsi correct
  136. fix Fuzz/distortion from AMP
  137. Biasing 1968 Pro Reverb. Help needed.
  138. TC Electronics voice solo XT SMD diode problem
  139. When to increase wattage of resistors
  140. Premier Reverb 90 hummm
  141. Storage and organization
  142. Ampeg Gemini I hum/buzz
  143. JC-55 unwanted distortion, reduced clean headroom?
  144. 1970's Fender Bassman 100 Running Hot
  145. PT Primary Impedance - 1.4 ohms?!
  146. Mesa Mark IV no filament on V1, front panel lights not lighting. Help please.!
  147. Marantz 4430 no sound
  148. Modding an AB165 Bassman. Question about the 470 ohm resistor??
  149. Univox U-400G blatty, distorted, and weak output
  150. Electro Harmonix Soul Food
  151. Fender Acoustasonic 30 DSP distorting
  152. 1967 Fender Bassman Head AB165 early Break-up. Help.
  153. Gibson G70 repair.
  154. CRATE FXT 120/Reparied Then worked 2 weeks then failed Again Same symptoms???
  155. Chasing noise, how: hum and/or buzz
  156. Ampeg Portaflex PF-500 on the bench, waiting for service manual from Ampeg
  157. Bell/Gibson Stereo 30 question
  158. Who uses what for chassis soldering?
  159. Peavey Mace VT burned 400 ohm power supply resistor?
  160. JVM 205H red plating V3 blowing 500ma ht fuse and VERY low Bias voltage on v3
  161. Fender 5150 III low output
  162. fender blues deluxe reissue no reverb
  163. Fender Bronco 40 Power Supply Troubleshooting
  164. Ampeg BA115 Transistor Replacement?
  165. Sunn 1200S Restoration project
  166. Peavey Transtube Bandit (1994) Intermittent Sound, Nasty Distortion
  167. Crate Palomino V32
  168. Carvin BX micro Bass MB210
  169. Peavey Classic VTX transformer OEM
  170. Marshall 8080 Issues
  171. Recommendations needed for capacitance tester.
  172. DV Mark Triple 6 new release - Questions
  173. Fender Acoustasonic SFX ii Repair
  174. Acoustic 320 repairs
  175. Aguilar tone hammer issue....schematic?
  176. QSC PLX2402 O/P stage heating
  177. Traynor YGL-3 Problems with PI and supply voltages
  178. Oh my, am I losing it?
  179. Marshall Haze 40 frying bacon sound
  180. Replacement for 4.7uf polyster Capacitor.
  181. Pin configuration of Din Plug for Genz Benz El Diablo 60
  182. Suggestions For Local Electronics Supply Shop: Mequon/Milwaukee WI Area
  183. Fender Hot Rod socket replacement
  184. Peavey Windsor - Oscillating at effects loop?!
  185. Peavey XR 600 400 R
  186. RCF Art 310A Problem
  187. Transformer wiring?
  188. Ashdown Mag 300
  189. Mesa Boogie 50 50 heater resistors toasted
  190. Buzzing Hot Rod Deluxe.
  191. Mesa Boogie High Phase Inverter Plate Voltage and Blocking Distortion
  192. Fender Stage 160 Heart Beating Noise Issue
  193. AC15C1 burning power supply resistor
  194. Hiwatt Lead 30 volume loss
  195. SWR 2x10c distortion & low output
  196. Carlsbro 60 TC power supply
  197. Fender SF Revrb Unit conversion to 6G15 Circuit
  198. Tele-Star M20R ss amp
  199. Can I use 6550s in my JTM45 clone ?
  200. Output transformer protection, flyback diodes, MOVs, 2KV capacitors,
  201. Brand New Here
  202. Bad noise (static?) - asking help for troubleshooting
  203. Marshall TSL:100 bias drift problem
  204. dB opera 405 distortion
  205. Ace Tone Bass-6 Motorboating
  206. Fender BXR 200 Bass Head
  207. KMD XV100SD Low Output and Tubes Red Plating
  208. bad input jacks on Fender SS Princeton Chorus, replacement ???
  209. Which chip is better for preamp Ad8512, opa2134, or ne5532?
  210. A couple questiosn about installing VVR in Fender Champ
  211. Tech 21 Trademark 10 Pot value wanted
  212. Vox AC30 blowing F2 fuse
  213. '65 Deluxe Reverb RI. Blown resitor.
  214. Beginner's ocilliscope recommendations please
  215. Kay 703C or not
  216. Shocking
  217. MojoTone High Voltage FX Loop
  218. 120 Hz Hum in Bassman Clone
  219. NOISY mesa boogie NOMAD 55
  220. Fused Capacitor lead
  221. DC Leakage Mystery
  222. 5E3 w/ DC at input jack
  223. Ashdown BTA-400 Bass Amp Severe Clipping
  224. SVT PT go boom. How can one protect PT secondaries?
  225. Fender squier 15 DC voltage on the output
  226. Acoustic 201 cab...where does the horn connect??
  227. Fender Bassman: sound cutting out
  228. Fender G Dec Jr signal loss at Codec
  229. Peavey KB100 no sound
  230. Distortion/low voltage problem...
  231. AC10 clicky trem
  232. Standby Switch squeal/bark sound on Marshall or Fender
  233. Yorkville AP812 powered mixer
  234. 7025, insulating spacer switcharoo?
  235. Master Volume in Dr.Z Prescription ES with Cathode Bias
  236. Toroidal Transformer Malady
  237. Surround Dope
  238. Diagnosing a Haysee30
  239. 1962 Fender Twin Caps
  240. Orange TH30: weird components ?
  241. RG50TC stuck in clean channel
  242. Anyone know how to find this pot?
  243. fender twin reverb
  244. Fender Princeton Chorus DSP Crackle and Pop
  245. Marshall DSL100 replacement boards
  246. Polytone Mini Brute V Preamp to power amp connection?
  247. 65 Vibro champ voltage check?
  248. EBS 350, 650 Amps...horrible mfgr process with heat sinking (what's that?)
  249. Peavey Valve King 112 Reverb cutting out.
  250. Laney Nexus Tube amp bias, balance etc.