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View Full Version : Maintenance, Troubleshooting & Repair



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  1. SF Twin Reverb with buzzy reverb
  2. Crate VC6210 popped NTC before fuse, need advice..
  3. TSL-60 with vexing farting problem on all channels
  4. Mesa .50 Caliber + Fried resistors
  5. Cornford Hurriance blown tx again
  6. Fender Deluxe 5C3 question
  7. Need help finding pots for Hartke repair
  8. samson s6 distorted output
  9. I Thought It Was a Ground Loop
  10. Ampeg B-200R Dc on output
  11. bad tube with bizarre symptom
  12. PEAVEY XXL head won't switch channels
  13. Peavey 212 clean channel won't work
  14. Plush P1000s on the bench
  15. Strong oscillation in Reverberocket Echo circuit
  16. Fender 6G6-B Bassman hum
  17. Fender Performer 1000 popping on turn-off
  18. Replacement potentiometer for Fender Red Knob Twin
  19. Just shooting the breeze Carvin 400FET
  20. Carlsbro Powerine 800 voltages
  21. Crate Blue Voodoo
  22. SF Twin Reverb Vibrato Hum on Speed Pot??
  23. PV XR600 400R links?
  24. Traynor YCV40 Blown DC Filament Circuit
  25. Circuit diagram for Roland KC-500?
  26. Crate GXT-100W circuit diagram?
  27. Fender Hot Rod Deluxe Issue
  28. SWR LA-15 Stumped
  29. Fender Rumble 100 Bass Amp Problems- Help, Please.
  30. 1974 Garnet stencil 10-PT - AC isolation mod
  31. Cornford hurricane schematic
  32. Ampeg Gemini II 7591 bias questions
  33. Ampeg Gemini II Tone stack question
  34. HK switchblade 50W combo repair
  35. What is wrong with NTE transistors?
  36. Ampeg SVT-300 bias
  37. Amp Static Crackling noises SOUND CLIP ATTACHED
  38. Tweed Bassman clone with harsh breakup
  39. Marshall tsl 100 head loud Clean Channel Hum after it heats up after few minutes on
  40. No volume with Crate GLX1200H
  41. musicman mystery tap
  42. channel switching help (problem with amp)
  43. preamp valve weirdness
  44. Mesa F100 blowing single tube, in same socket, every time
  45. Twin reverb boost oscillation
  46. hartke ha7000
  47. Bugera 333xl-212 cap problem
  48. Could this cause my issue?
  49. Marshall Connector Identification
  50. 6V6 amp cutting out when guitars strings are picked hard
  51. Hafler G300 clipping on negative portion of waveform
  52. 80's Yamaha G-100
  53. SVT3Pro power amp failure
  54. Blackstar series one 50 help
  55. bias issue
  56. Blues Jr oscillation-
  57. Rattling on Fender Red Knob Twin! What could be the cause?
  58. Single Ended Odd Distortion - To NFB or not to NFB?
  59. Fender Champion 30
  60. Ampeg B15 woes.... no sound from guitar
  61. Fender Roc 1000 changing channels when played.
  62. Marshall JCM 2000 trans wires
  63. Marshall DSL short ???
  64. Need 3 Prong Power Conversion - But Heater On Primary Side of Iso Trans
  65. Krankenstein Jr PT replacement?
  66. Marshall VS100 clean problem
  67. Need Bias Help VC50H by SLM Crate
  68. GK 400rb III, heatsink isolated screw
  69. B-15N Power transformer replacement
  70. Current problem with a 6534+
  71. Looking for info on Ampeg B4
  72. Dealing with High B+
  73. Marhsall 100watt 1959 SLP Oscillation?
  74. SVT CL repair - process and safety
  75. Prosonic drive channel week and nasty problem
  76. Fender Super Champ XD no sound
  77. Marshall DSL HELP !
  78. What is your favorite flush cutter?
  79. Mesa Blue Angel burned board
  80. ** The Marshall TSL122 JCM2000 Repair/Mods Page **
  81. Help With Squeal/Crosstalk...
  82. HUM Marshall JMP 50w
  83. hooking up a 3 wire power cabl
  84. Soldano Cuts out
  85. Peavey Valveking died
  86. 73 Fender Silverface Twin Reverb Noise New Findings & Questions
  87. Fender 1961 Concert Brown face 6g12a re-cap time, need input
  88. Twin Reverb PT Surface Temperature
  89. Weird residual voltage problem...
  90. 5e3 build buzzing/overtone noise
  91. Ashdown EVO 500 III Hum
  92. fender prosonic output transformer
  93. AC30 Normal channel ground loop fix
  94. Channel bleed JCM 800 2205
  95. Fender reverb driver transformer - green wire grounded?
  96. 60's VOX Berkely II - where is the reverb tank?
  97. 333xl infinium problem
  98. Transformer specs
  99. Could someone open their Boogie Mark III for me?
  100. Line 6 Spider II - noise and channel switching issue
  101. Peavey Penta Series 140 Watt Head - Need Schematic
  102. peavey 300ch
  103. 5150 II to orgininal 5150 spec mistake
  104. hum problem in new homebrew build
  105. Marshal TSL 60 channel switching from CRUNCH/OD1 to LEAD/OD2 problem
  106. problem with roland cube 20x
  107. How much hum is acceptable in a Fender Red Knob Twin
  108. behringer Xentyx 1222 fx psu help
  109. Kustom Lead iii sc ombo - reverb issue - need schematic
  110. MB Subway Rocket Overall Volume Seems Low for 20w
  111. Engl Powerball interesting problem.
  112. What is cr-3 in FENDER DEVILLE
  113. Random Noise generated in power output stage of Fender Super 112...new guy here
  114. High pitched whistle continues on Fender Red Knob Twin, I am getting desperate
  115. What Brand or Type of valve would you use for a Bass
  116. Acoustic schematic
  117. Kustom 150 run hot?
  118. 73 Fender Silverface Twin Reverb Schematic / Layout question ?
  119. Behringer Truth B2030A ICs
  120. Peavey Mace VT red plating and arching...ouch!
  121. Marshall 75 Nasty Problem
  122. who has the best prices on ends?
  123. Genz-Benz El Diablo 100
  124. Peavey VTM 60 Question
  125. Peavey Mace VT Power Tubes?
  126. Marshal TSL 60 channel switching from OD1 to OD2 problem
  127. yet another VS265 with troubles
  128. 5150 - No Sound. HELP!!!
  129. Frontman 212r (yes another one)
  130. Help needed for new ideas to solve Ampeg BA115 intermittent crackle issue
  131. Ampeg SVT CL
  132. 6G2 Princeton - Weird Oscillation Only When Trem is Off?
  133. Silverface Reverb Bias Issue
  134. Gallien Kreuger 1001RB mk II turn on thump
  135. Very loud intermittent amp problem.
  136. NFB wire diameter/gauge
  137. When OT Diagnostics Don't Help
  138. Is this risky?
  139. VOX AC30 - Bad distortion
  140. Reverb pop when the amp is on, and long starting vibrato
  141. Peavey Delta Blues issue...won't work
  142. MarshallJCM800 2210 hum
  143. mesa boogie f-100, loss of reverb
  144. Bad Reverb Transformer?
  145. Magnatone 213 bias question
  146. Laney LC50 MK2 Low Normal channel
  147. Boss CE-3 LED enigma
  148. 73 Fender Silverface Twin Reverb Voltages ,and Noise
  149. Bypassing Peavey Tubefex DSP / turning it analogue
  150. Peavey Mace channel switching problem ?
  151. Behringer MDX 212
  152. sunn beta lead, choked, low, farty output
  153. Mackie Snap crackle and pop
  154. 6U10 hummm
  155. Roland JC-120 circuit help
  156. Laney LC50 MK2 Schematic reqd
  157. Fender 80s "II" series amps vactrol ratings?
  158. SWR 350 Bass Howling
  159. Line 6 spider 212
  160. HH Bass Machine
  161. Mesa Boogie Road King - strange distortion in outpout stage
  162. Speaker-related dumb question: speaker SIZE
  163. Speaker Protection help
  164. Univox Bias questions HIGH VOLTAGE!!!
  165. Midi Problem: Loose all programs when turning off amp
  166. AC filaments too hot!
  167. Princeton Problem
  168. Marshall DSL 50 still passing signal with the volumes on 0?
  169. Trace Elliot AH300 GP12 series6
  170. Vox AGA-70 DI mod request schems needed.
  171. Mesa Boogie Lone Star Special
  172. Trace Elliot AH300 outputs
  173. Marshall TSL100 Problems
  174. Marshall TSL100 Problems
  175. Mesa Boogie Mark IV one 6L6 red plating and loud hum.
  176. Secondary PT voltages for 5150?
  177. Help with early 50s Danalectro Challenger
  178. Bias set point for 8417s
  179. Running iPod into 6AU6 input...
  180. Hot looking anode/plate resistors.
  181. 1961 Ampeg Reverbrocket (May 1961)
  182. Very Strange Problem Fender Princeton 112 Plus
  183. B52 At-212 with intermittent problem
  184. Musicman RD 50 schematic question
  185. Roland re201 echo
  186. Voltage modification for fender superchamp xd 110v to 220v
  187. Needle Nose Pliers??
  188. Vibrolux reverb custom issue
  189. Fender Champ 12 red-knob channel switching problem
  190. Where Can I Find Capacitors??
  191. Traynor YGM4 hum. Need some expert advice/input
  192. JCM900 2100 Power Tube Bias question
  193. Peavey Classic VTX 2 12 Questions
  194. '74 Mk II Super Bass: grid resistors
  195. very loud popping-Roland Bolt 60
  196. DR AB763
  197. GK MB150 resurrection?
  198. Kustom Quad 200 HD
  199. Traynor Reverb Mate 40 strange breakup
  200. 1997 SWR california blonde I REALLY odd problem.. HELP
  201. Anyone know the average mV output of a guitar pickup (single coil)
  202. A quick one:use MKT GPF or something else?
  203. Peavey Musician 400 Distortion and Fuzz sound faint.
  204. Channel Switching problem on Carvin Belair amp
  205. Behringer BX300T dead amp
  206. Need help identifying tube/socket wiring in a homebrew amp.
  207. Amp blowing fuses
  208. Fender Red Knob Twin 2nd channel high pitch squeal/ whistle another cause?
  209. Trace Elliot AH-300 'increase input' green LED
  210. help need on bx1200
  211. Peavey Valveking troubles
  212. Fender 6G6-B Bass Input Side - Little to no Bass Response from Bass Pot
  213. Marshall DSL50 No Output - how big a voltage swing should I see at output tube grids?
  214. Anyone interested in a Mesa Boogie 50 Cal + head ?
  215. Help with a LAB SERIES L5 (2x12 100W SS amp)
  216. Peavey Triumph 60
  217. AB763 Twin filter cap question
  218. Peavey Special 130 problem.. light is on but no sound....
  219. The Deluxe Reverb Ocean mod...
  220. 5E3 build
  221. Spider II - no sound
  222. reverb circuit clipping/spiking
  223. Marshall MG TDA7293 PCB Assembly Wired Backwards??? Help!
  224. Fender Ultimate Chorus chassis removal
  225. Blonde Bassman Wow a lotta gain
  226. Peavey CS800x problem - Smell it getting hot when powered on - HELP!
  227. Something fried in my Marshall "Studio 15"
  228. Peavey Triumph 120 channel switching problem
  229. needed schematics yamaha undred 115
  230. Mackie SRS1500
  231. Deluxe reverb V5 pin readings way off
  232. Markbass Little mark 800 tube manual?
  233. Polytone Mega-Brute clipping early
  234. Acoustasonic 30 DSP
  235. Heads up: Mar$hall Valvestate pwr switch source
  236. Whats a good approach to fixing solid state output stages
  237. Ramsa WP-9110 amp runs warm when idle
  238. Low headroom from Sunn Solos II
  239. Vox Cambridge 30 Repair/Questions
  240. VHT G100-CL Bad Sound Issue
  241. Sveltana Wing-C tubes out of production
  242. Peavey ultra 120 + no sound/ only two preamp tubes glow
  243. Magnavox Astro-Sonic wont spin at slower speed settings
  244. Old tube amp sounds good only at full volume
  245. Jfet muting
  246. tubes redplating when signal applied
  247. Mesa Boogie F-30 Issues. Need urgent HELP. Please...
  248. Traynor YGM3 very low volume
  249. Vendor for Eyelet Fiberboard Needed - Mine is out of stock
  250. DR normal channel problem