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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Krankenstein Jr PT replacement?
  2. Marshall VS100 clean problem
  3. Need Bias Help VC50H by SLM Crate
  4. GK 400rb III, heatsink isolated screw
  5. B-15N Power transformer replacement
  6. Current problem with a 6534+
  7. Looking for info on Ampeg B4
  8. Dealing with High B+
  9. Marhsall 100watt 1959 SLP Oscillation?
  10. SVT CL repair - process and safety
  11. Prosonic drive channel week and nasty problem
  12. Fender Super Champ XD no sound
  13. Marshall DSL HELP !
  14. What is your favorite flush cutter?
  15. Mesa Blue Angel burned board
  16. ** The Marshall TSL122 JCM2000 Repair/Mods Page **
  17. Help With Squeal/Crosstalk...
  18. HUM Marshall JMP 50w
  19. hooking up a 3 wire power cabl
  20. Soldano Cuts out
  21. Peavey Valveking died
  22. 73 Fender Silverface Twin Reverb Noise New Findings & Questions
  23. Fender 1961 Concert Brown face 6g12a re-cap time, need input
  24. Twin Reverb PT Surface Temperature
  25. Weird residual voltage problem...
  26. 5e3 build buzzing/overtone noise
  27. Ashdown EVO 500 III Hum
  28. fender prosonic output transformer
  29. AC30 Normal channel ground loop fix
  30. Channel bleed JCM 800 2205
  31. Fender reverb driver transformer - green wire grounded?
  32. 60's VOX Berkely II - where is the reverb tank?
  33. 333xl infinium problem
  34. Transformer specs
  35. Could someone open their Boogie Mark III for me?
  36. Line 6 Spider II - noise and channel switching issue
  37. Peavey Penta Series 140 Watt Head - Need Schematic
  38. peavey 300ch
  39. 5150 II to orgininal 5150 spec mistake
  40. hum problem in new homebrew build
  41. Marshal TSL 60 channel switching from CRUNCH/OD1 to LEAD/OD2 problem
  42. problem with roland cube 20x
  43. How much hum is acceptable in a Fender Red Knob Twin
  44. behringer Xentyx 1222 fx psu help
  45. Kustom Lead iii sc ombo - reverb issue - need schematic
  46. MB Subway Rocket Overall Volume Seems Low for 20w
  47. Engl Powerball interesting problem.
  48. What is cr-3 in FENDER DEVILLE
  49. Random Noise generated in power output stage of Fender Super 112...new guy here
  50. High pitched whistle continues on Fender Red Knob Twin, I am getting desperate
  51. What Brand or Type of valve would you use for a Bass
  52. Acoustic schematic
  53. Kustom 150 run hot?
  54. 73 Fender Silverface Twin Reverb Schematic / Layout question ?
  55. Behringer Truth B2030A ICs
  56. Peavey Mace VT red plating and arching...ouch!
  57. Marshall 75 Nasty Problem
  58. who has the best prices on ends?
  59. Genz-Benz El Diablo 100
  60. Peavey VTM 60 Question
  61. Peavey Mace VT Power Tubes?
  62. Marshal TSL 60 channel switching from OD1 to OD2 problem
  63. yet another VS265 with troubles
  64. 5150 - No Sound. HELP!!!
  65. Frontman 212r (yes another one)
  66. Help needed for new ideas to solve Ampeg BA115 intermittent crackle issue
  67. Ampeg SVT CL
  68. 6G2 Princeton - Weird Oscillation Only When Trem is Off?
  69. Silverface Reverb Bias Issue
  70. Gallien Kreuger 1001RB mk II turn on thump
  71. Very loud intermittent amp problem.
  72. NFB wire diameter/gauge
  73. When OT Diagnostics Don't Help
  74. Is this risky?
  75. VOX AC30 - Bad distortion
  76. Reverb pop when the amp is on, and long starting vibrato
  77. Peavey Delta Blues issue...won't work
  78. MarshallJCM800 2210 hum
  79. mesa boogie f-100, loss of reverb
  80. Bad Reverb Transformer?
  81. Magnatone 213 bias question
  82. Laney LC50 MK2 Low Normal channel
  83. Boss CE-3 LED enigma
  84. 73 Fender Silverface Twin Reverb Voltages ,and Noise
  85. Bypassing Peavey Tubefex DSP / turning it analogue
  86. Peavey Mace channel switching problem ?
  87. Behringer MDX 212
  88. sunn beta lead, choked, low, farty output
  89. Mackie Snap crackle and pop
  90. 6U10 hummm
  91. Roland JC-120 circuit help
  92. Laney LC50 MK2 Schematic reqd
  93. Fender 80s "II" series amps vactrol ratings?
  94. SWR 350 Bass Howling
  95. Line 6 spider 212
  96. HH Bass Machine
  97. Mesa Boogie Road King - strange distortion in outpout stage
  98. Speaker-related dumb question: speaker SIZE
  99. Speaker Protection help
  100. Univox Bias questions HIGH VOLTAGE!!!
  101. Midi Problem: Loose all programs when turning off amp
  102. AC filaments too hot!
  103. Princeton Problem
  104. Marshall DSL 50 still passing signal with the volumes on 0?
  105. Trace Elliot AH300 GP12 series6
  106. Vox AGA-70 DI mod request schems needed.
  107. Mesa Boogie Lone Star Special
  108. Trace Elliot AH300 outputs
  109. Marshall TSL100 Problems
  110. Marshall TSL100 Problems
  111. Mesa Boogie Mark IV one 6L6 red plating and loud hum.
  112. Secondary PT voltages for 5150?
  113. Help with early 50s Danalectro Challenger
  114. Bias set point for 8417s
  115. Running iPod into 6AU6 input...
  116. Hot looking anode/plate resistors.
  117. 1961 Ampeg Reverbrocket (May 1961)
  118. Very Strange Problem Fender Princeton 112 Plus
  119. B52 At-212 with intermittent problem
  120. Musicman RD 50 schematic question
  121. Roland re201 echo
  122. Voltage modification for fender superchamp xd 110v to 220v
  123. Needle Nose Pliers??
  124. Vibrolux reverb custom issue
  125. Fender Champ 12 red-knob channel switching problem
  126. Where Can I Find Capacitors??
  127. Traynor YGM4 hum. Need some expert advice/input
  128. JCM900 2100 Power Tube Bias question
  129. Peavey Classic VTX 2 12 Questions
  130. '74 Mk II Super Bass: grid resistors
  131. very loud popping-Roland Bolt 60
  132. DR AB763
  133. GK MB150 resurrection?
  134. Kustom Quad 200 HD
  135. Traynor Reverb Mate 40 strange breakup
  136. 1997 SWR california blonde I REALLY odd problem.. HELP
  137. Anyone know the average mV output of a guitar pickup (single coil)
  138. A quick one:use MKT GPF or something else?
  139. Peavey Musician 400 Distortion and Fuzz sound faint.
  140. Channel Switching problem on Carvin Belair amp
  141. Behringer BX300T dead amp
  142. Need help identifying tube/socket wiring in a homebrew amp.
  143. Amp blowing fuses
  144. Fender Red Knob Twin 2nd channel high pitch squeal/ whistle another cause?
  145. Trace Elliot AH-300 'increase input' green LED
  146. help need on bx1200
  147. Peavey Valveking troubles
  148. Fender 6G6-B Bass Input Side - Little to no Bass Response from Bass Pot
  149. Marshall DSL50 No Output - how big a voltage swing should I see at output tube grids?
  150. Anyone interested in a Mesa Boogie 50 Cal + head ?
  151. Help with a LAB SERIES L5 (2x12 100W SS amp)
  152. Peavey Triumph 60
  153. AB763 Twin filter cap question
  154. Peavey Special 130 problem.. light is on but no sound....
  155. The Deluxe Reverb Ocean mod...
  156. 5E3 build
  157. Spider II - no sound
  158. reverb circuit clipping/spiking
  159. Marshall MG TDA7293 PCB Assembly Wired Backwards??? Help!
  160. Fender Ultimate Chorus chassis removal
  161. Blonde Bassman Wow a lotta gain
  162. Peavey CS800x problem - Smell it getting hot when powered on - HELP!
  163. Something fried in my Marshall "Studio 15"
  164. Peavey Triumph 120 channel switching problem
  165. needed schematics yamaha undred 115
  166. Mackie SRS1500
  167. Deluxe reverb V5 pin readings way off
  168. Markbass Little mark 800 tube manual?
  169. Polytone Mega-Brute clipping early
  170. Acoustasonic 30 DSP
  171. Heads up: Mar$hall Valvestate pwr switch source
  172. Whats a good approach to fixing solid state output stages
  173. Ramsa WP-9110 amp runs warm when idle
  174. Low headroom from Sunn Solos II
  175. Vox Cambridge 30 Repair/Questions
  176. VHT G100-CL Bad Sound Issue
  177. Sveltana Wing-C tubes out of production
  178. Peavey ultra 120 + no sound/ only two preamp tubes glow
  179. Magnavox Astro-Sonic wont spin at slower speed settings
  180. Old tube amp sounds good only at full volume
  181. Jfet muting
  182. tubes redplating when signal applied
  183. Mesa Boogie F-30 Issues. Need urgent HELP. Please...
  184. Traynor YGM3 very low volume
  185. Vendor for Eyelet Fiberboard Needed - Mine is out of stock
  186. DR normal channel problem
  187. Blackstar Artisan 100 OT
  188. Fender Super Reverb RI rattling
  189. Source of Ampeg switches
  190. A question on hum ?
  191. JBL SF15
  192. Mitchell "Deluxe" combo amp
  193. Source for Transformer
  194. Schematic for a Crate GFX50
  195. 5E7 Problem and need help - ratty distortion at all volumes (Other post disappeared)
  196. 75 Deluxe Reverb
  197. Vox AC50 CPain in the &^%
  198. Crackles/Pops in JCM800 Build
  199. Ashdown ABM 500 EVO Issue
  200. Sudden volume jumps
  201. Korg C-4000 digital piano, no sounds
  202. Original Marshall Tube Identification Question - JCM 800 4010 (2204 Circuit)
  203. Another new build 5E7 problem thread - ratty terrible distortion at all volumes
  204. Alto PBM8-250
  205. Marshall MG50CFX
  206. Marshall JTM 60 filter cap and Bridge rectifier advice
  207. effects loop
  208. Marshall tsl122 Bias problem
  209. Fender Twin Power Transformer - is she dead Jim?
  210. Magnatone Ultralinear OT tap identification
  211. Bad crackling noise with larger input signals, New build
  212. remove post, fixed
  213. Anyone work on a Fender red knob Super 60?
  214. 5F6A - hum with added gain stage
  215. Very Low volume problem
  216. Kustom 2x10 Amp Issue
  217. Very Low volume problem
  218. Marshall VS65R valvestate Output transistor biasing
  219. Marshall gold-back 12" speaker testing
  220. Blues Jr power tubes not lighting up
  221. Bad hum on initial power up/first bias setting
  222. Bugera amp issue
  223. Fender Champ Capacitors and other issues
  224. Will Tung Sol 7581's work in my '83 Fender Concert II.
  225. Bias issue
  226. Helllllllllp !!!
  227. Power switch for Valvestate: Source?
  228. Wall isolation transformer
  229. Testing an output transformer...
  230. Ampeg BA115HP tuner oscillations
  231. Ampeg B5R: Overdrive channel always on
  232. Fender Super 60 Voltage Questions?
  233. Ampeg SB12 volume pot hum... but only when turned down?
  234. DC on opamp outpin
  235. Marshall dsl 401 reverb
  236. Hum in Fender Vibro Champ
  237. rec 4 replacement PT Ampeg B15--Edcor?
  238. How do I check output voltage on my Marshall Super Lead 100 vintage 1971 head?
  239. Elk Echo Sonic, anyone?
  240. Fender 65 Deluxe Reverb
  241. Benefits of using a scope?
  242. do I really have to pull the ckt bd to change the PT in Ampeg B15?
  243. Ampeg SVT CL
  244. Acoustic 117 rectifier specs
  245. Compu-Bias Meter Chip ?
  246. Mesa Boogie Recto 3ch - NO clean channel
  247. JCM 2000 TSL 122 FX Loop Buzz
  248. 117 volt transformer for a Marshall Valvestate VS100R
  249. Bandmaster Reverb Issue
  250. Old Peavey Minx sputtering at high volumes