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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Twin reverb boost oscillation
  2. hartke ha7000
  3. Bugera 333xl-212 cap problem
  4. Could this cause my issue?
  5. Marshall Connector Identification
  6. 6V6 amp cutting out when guitars strings are picked hard
  7. Hafler G300 clipping on negative portion of waveform
  8. 80's Yamaha G-100
  9. SVT3Pro power amp failure
  10. Blackstar series one 50 help
  11. bias issue
  12. Blues Jr oscillation-
  13. Rattling on Fender Red Knob Twin! What could be the cause?
  14. Single Ended Odd Distortion - To NFB or not to NFB?
  15. Fender Champion 30
  16. Ampeg B15 woes.... no sound from guitar
  17. Fender Roc 1000 changing channels when played.
  18. Marshall JCM 2000 trans wires
  19. Marshall DSL short ???
  20. Need 3 Prong Power Conversion - But Heater On Primary Side of Iso Trans
  21. Krankenstein Jr PT replacement?
  22. Marshall VS100 clean problem
  23. Need Bias Help VC50H by SLM Crate
  24. GK 400rb III, heatsink isolated screw
  25. B-15N Power transformer replacement
  26. Current problem with a 6534+
  27. Looking for info on Ampeg B4
  28. Dealing with High B+
  29. Marhsall 100watt 1959 SLP Oscillation?
  30. SVT CL repair - process and safety
  31. Prosonic drive channel week and nasty problem
  32. Fender Super Champ XD no sound
  33. Marshall DSL HELP !
  34. What is your favorite flush cutter?
  35. Mesa Blue Angel burned board
  36. ** The Marshall TSL122 JCM2000 Repair/Mods Page **
  37. Help With Squeal/Crosstalk...
  38. HUM Marshall JMP 50w
  39. hooking up a 3 wire power cabl
  40. Soldano Cuts out
  41. Peavey Valveking died
  42. 73 Fender Silverface Twin Reverb Noise New Findings & Questions
  43. Fender 1961 Concert Brown face 6g12a re-cap time, need input
  44. Twin Reverb PT Surface Temperature
  45. Weird residual voltage problem...
  46. 5e3 build buzzing/overtone noise
  47. Ashdown EVO 500 III Hum
  48. fender prosonic output transformer
  49. AC30 Normal channel ground loop fix
  50. Channel bleed JCM 800 2205
  51. Fender reverb driver transformer - green wire grounded?
  52. 60's VOX Berkely II - where is the reverb tank?
  53. 333xl infinium problem
  54. Transformer specs
  55. Could someone open their Boogie Mark III for me?
  56. Line 6 Spider II - noise and channel switching issue
  57. Peavey Penta Series 140 Watt Head - Need Schematic
  58. peavey 300ch
  59. 5150 II to orgininal 5150 spec mistake
  60. hum problem in new homebrew build
  61. Marshal TSL 60 channel switching from CRUNCH/OD1 to LEAD/OD2 problem
  62. problem with roland cube 20x
  63. How much hum is acceptable in a Fender Red Knob Twin
  64. behringer Xentyx 1222 fx psu help
  65. Kustom Lead iii sc ombo - reverb issue - need schematic
  66. MB Subway Rocket Overall Volume Seems Low for 20w
  67. Engl Powerball interesting problem.
  68. What is cr-3 in FENDER DEVILLE
  69. Random Noise generated in power output stage of Fender Super 112...new guy here
  70. High pitched whistle continues on Fender Red Knob Twin, I am getting desperate
  71. What Brand or Type of valve would you use for a Bass
  72. Acoustic schematic
  73. Kustom 150 run hot?
  74. 73 Fender Silverface Twin Reverb Schematic / Layout question ?
  75. Behringer Truth B2030A ICs
  76. Peavey Mace VT red plating and arching...ouch!
  77. Marshall 75 Nasty Problem
  78. who has the best prices on ends?
  79. Genz-Benz El Diablo 100
  80. Peavey VTM 60 Question
  81. Peavey Mace VT Power Tubes?
  82. Marshal TSL 60 channel switching from OD1 to OD2 problem
  83. yet another VS265 with troubles
  84. 5150 - No Sound. HELP!!!
  85. Frontman 212r (yes another one)
  86. Help needed for new ideas to solve Ampeg BA115 intermittent crackle issue
  87. Ampeg SVT CL
  88. 6G2 Princeton - Weird Oscillation Only When Trem is Off?
  89. Silverface Reverb Bias Issue
  90. Gallien Kreuger 1001RB mk II turn on thump
  91. Very loud intermittent amp problem.
  92. NFB wire diameter/gauge
  93. When OT Diagnostics Don't Help
  94. Is this risky?
  95. VOX AC30 - Bad distortion
  96. Reverb pop when the amp is on, and long starting vibrato
  97. Peavey Delta Blues issue...won't work
  98. MarshallJCM800 2210 hum
  99. mesa boogie f-100, loss of reverb
  100. Bad Reverb Transformer?
  101. Magnatone 213 bias question
  102. Laney LC50 MK2 Low Normal channel
  103. Boss CE-3 LED enigma
  104. 73 Fender Silverface Twin Reverb Voltages ,and Noise
  105. Bypassing Peavey Tubefex DSP / turning it analogue
  106. Peavey Mace channel switching problem ?
  107. Behringer MDX 212
  108. sunn beta lead, choked, low, farty output
  109. Mackie Snap crackle and pop
  110. 6U10 hummm
  111. Roland JC-120 circuit help
  112. Laney LC50 MK2 Schematic reqd
  113. Fender 80s "II" series amps vactrol ratings?
  114. SWR 350 Bass Howling
  115. Line 6 spider 212
  116. HH Bass Machine
  117. Mesa Boogie Road King - strange distortion in outpout stage
  118. Speaker-related dumb question: speaker SIZE
  119. Speaker Protection help
  120. Univox Bias questions HIGH VOLTAGE!!!
  121. Midi Problem: Loose all programs when turning off amp
  122. AC filaments too hot!
  123. Princeton Problem
  124. Marshall DSL 50 still passing signal with the volumes on 0?
  125. Trace Elliot AH300 GP12 series6
  126. Vox AGA-70 DI mod request schems needed.
  127. Mesa Boogie Lone Star Special
  128. Trace Elliot AH300 outputs
  129. Marshall TSL100 Problems
  130. Marshall TSL100 Problems
  131. Mesa Boogie Mark IV one 6L6 red plating and loud hum.
  132. Secondary PT voltages for 5150?
  133. Help with early 50s Danalectro Challenger
  134. Bias set point for 8417s
  135. Running iPod into 6AU6 input...
  136. Hot looking anode/plate resistors.
  137. 1961 Ampeg Reverbrocket (May 1961)
  138. Very Strange Problem Fender Princeton 112 Plus
  139. B52 At-212 with intermittent problem
  140. Musicman RD 50 schematic question
  141. Roland re201 echo
  142. Voltage modification for fender superchamp xd 110v to 220v
  143. Needle Nose Pliers??
  144. Vibrolux reverb custom issue
  145. Fender Champ 12 red-knob channel switching problem
  146. Where Can I Find Capacitors??
  147. Traynor YGM4 hum. Need some expert advice/input
  148. JCM900 2100 Power Tube Bias question
  149. Peavey Classic VTX 2 12 Questions
  150. '74 Mk II Super Bass: grid resistors
  151. very loud popping-Roland Bolt 60
  152. DR AB763
  153. GK MB150 resurrection?
  154. Kustom Quad 200 HD
  155. Traynor Reverb Mate 40 strange breakup
  156. 1997 SWR california blonde I REALLY odd problem.. HELP
  157. Anyone know the average mV output of a guitar pickup (single coil)
  158. A quick one:use MKT GPF or something else?
  159. Peavey Musician 400 Distortion and Fuzz sound faint.
  160. Channel Switching problem on Carvin Belair amp
  161. Behringer BX300T dead amp
  162. Need help identifying tube/socket wiring in a homebrew amp.
  163. Amp blowing fuses
  164. Fender Red Knob Twin 2nd channel high pitch squeal/ whistle another cause?
  165. Trace Elliot AH-300 'increase input' green LED
  166. help need on bx1200
  167. Peavey Valveking troubles
  168. Fender 6G6-B Bass Input Side - Little to no Bass Response from Bass Pot
  169. Marshall DSL50 No Output - how big a voltage swing should I see at output tube grids?
  170. Anyone interested in a Mesa Boogie 50 Cal + head ?
  171. Help with a LAB SERIES L5 (2x12 100W SS amp)
  172. Peavey Triumph 60
  173. AB763 Twin filter cap question
  174. Peavey Special 130 problem.. light is on but no sound....
  175. The Deluxe Reverb Ocean mod...
  176. 5E3 build
  177. Spider II - no sound
  178. reverb circuit clipping/spiking
  179. Marshall MG TDA7293 PCB Assembly Wired Backwards??? Help!
  180. Fender Ultimate Chorus chassis removal
  181. Blonde Bassman Wow a lotta gain
  182. Peavey CS800x problem - Smell it getting hot when powered on - HELP!
  183. Something fried in my Marshall "Studio 15"
  184. Peavey Triumph 120 channel switching problem
  185. needed schematics yamaha undred 115
  186. Mackie SRS1500
  187. Deluxe reverb V5 pin readings way off
  188. Markbass Little mark 800 tube manual?
  189. Polytone Mega-Brute clipping early
  190. Acoustasonic 30 DSP
  191. Heads up: Mar$hall Valvestate pwr switch source
  192. Whats a good approach to fixing solid state output stages
  193. Ramsa WP-9110 amp runs warm when idle
  194. Low headroom from Sunn Solos II
  195. Vox Cambridge 30 Repair/Questions
  196. VHT G100-CL Bad Sound Issue
  197. Sveltana Wing-C tubes out of production
  198. Peavey ultra 120 + no sound/ only two preamp tubes glow
  199. Magnavox Astro-Sonic wont spin at slower speed settings
  200. Old tube amp sounds good only at full volume
  201. Jfet muting
  202. tubes redplating when signal applied
  203. Mesa Boogie F-30 Issues. Need urgent HELP. Please...
  204. Traynor YGM3 very low volume
  205. Vendor for Eyelet Fiberboard Needed - Mine is out of stock
  206. DR normal channel problem
  207. Blackstar Artisan 100 OT
  208. Fender Super Reverb RI rattling
  209. Source of Ampeg switches
  210. A question on hum ?
  211. JBL SF15
  212. Mitchell "Deluxe" combo amp
  213. Source for Transformer
  214. Schematic for a Crate GFX50
  215. 5E7 Problem and need help - ratty distortion at all volumes (Other post disappeared)
  216. 75 Deluxe Reverb
  217. Vox AC50 CPain in the &^%
  218. Crackles/Pops in JCM800 Build
  219. Ashdown ABM 500 EVO Issue
  220. Sudden volume jumps
  221. Korg C-4000 digital piano, no sounds
  222. Original Marshall Tube Identification Question - JCM 800 4010 (2204 Circuit)
  223. Another new build 5E7 problem thread - ratty terrible distortion at all volumes
  224. Alto PBM8-250
  225. Marshall MG50CFX
  226. Marshall JTM 60 filter cap and Bridge rectifier advice
  227. effects loop
  228. Marshall tsl122 Bias problem
  229. Fender Twin Power Transformer - is she dead Jim?
  230. Magnatone Ultralinear OT tap identification
  231. Bad crackling noise with larger input signals, New build
  232. remove post, fixed
  233. Anyone work on a Fender red knob Super 60?
  234. 5F6A - hum with added gain stage
  235. Very Low volume problem
  236. Kustom 2x10 Amp Issue
  237. Very Low volume problem
  238. Marshall VS65R valvestate Output transistor biasing
  239. Marshall gold-back 12" speaker testing
  240. Blues Jr power tubes not lighting up
  241. Bad hum on initial power up/first bias setting
  242. Bugera amp issue
  243. Fender Champ Capacitors and other issues
  244. Will Tung Sol 7581's work in my '83 Fender Concert II.
  245. Bias issue
  246. Helllllllllp !!!
  247. Power switch for Valvestate: Source?
  248. Wall isolation transformer
  249. Testing an output transformer...
  250. Ampeg BA115HP tuner oscillations