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View Full Version : Maintenance, Troubleshooting & Repair



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  1. SWR 350 Bass Howling
  2. Line 6 spider 212
  3. HH Bass Machine
  4. Mesa Boogie Road King - strange distortion in outpout stage
  5. Speaker-related dumb question: speaker SIZE
  6. Speaker Protection help
  7. Univox Bias questions HIGH VOLTAGE!!!
  8. Midi Problem: Loose all programs when turning off amp
  9. AC filaments too hot!
  10. Princeton Problem
  11. Marshall DSL 50 still passing signal with the volumes on 0?
  12. Trace Elliot AH300 GP12 series6
  13. Vox AGA-70 DI mod request schems needed.
  14. Mesa Boogie Lone Star Special
  15. Trace Elliot AH300 outputs
  16. Marshall TSL100 Problems
  17. Marshall TSL100 Problems
  18. Mesa Boogie Mark IV one 6L6 red plating and loud hum.
  19. Secondary PT voltages for 5150?
  20. Help with early 50s Danalectro Challenger
  21. Bias set point for 8417s
  22. Running iPod into 6AU6 input...
  23. Hot looking anode/plate resistors.
  24. 1961 Ampeg Reverbrocket (May 1961)
  25. Very Strange Problem Fender Princeton 112 Plus
  26. B52 At-212 with intermittent problem
  27. Musicman RD 50 schematic question
  28. Roland re201 echo
  29. Voltage modification for fender superchamp xd 110v to 220v
  30. Needle Nose Pliers??
  31. Vibrolux reverb custom issue
  32. Fender Champ 12 red-knob channel switching problem
  33. Where Can I Find Capacitors??
  34. Traynor YGM4 hum. Need some expert advice/input
  35. JCM900 2100 Power Tube Bias question
  36. Peavey Classic VTX 2 12 Questions
  37. '74 Mk II Super Bass: grid resistors
  38. very loud popping-Roland Bolt 60
  39. DR AB763
  40. GK MB150 resurrection?
  41. Kustom Quad 200 HD
  42. Traynor Reverb Mate 40 strange breakup
  43. 1997 SWR california blonde I REALLY odd problem.. HELP
  44. Anyone know the average mV output of a guitar pickup (single coil)
  45. A quick one:use MKT GPF or something else?
  46. Peavey Musician 400 Distortion and Fuzz sound faint.
  47. Channel Switching problem on Carvin Belair amp
  48. Behringer BX300T dead amp
  49. Need help identifying tube/socket wiring in a homebrew amp.
  50. Amp blowing fuses
  51. Fender Red Knob Twin 2nd channel high pitch squeal/ whistle another cause?
  52. Trace Elliot AH-300 'increase input' green LED
  53. help need on bx1200
  54. Peavey Valveking troubles
  55. Fender 6G6-B Bass Input Side - Little to no Bass Response from Bass Pot
  56. Marshall DSL50 No Output - how big a voltage swing should I see at output tube grids?
  57. Anyone interested in a Mesa Boogie 50 Cal + head ?
  58. Help with a LAB SERIES L5 (2x12 100W SS amp)
  59. Peavey Triumph 60
  60. AB763 Twin filter cap question
  61. Peavey Special 130 problem.. light is on but no sound....
  62. The Deluxe Reverb Ocean mod...
  63. 5E3 build
  64. Spider II - no sound
  65. reverb circuit clipping/spiking
  66. Marshall MG TDA7293 PCB Assembly Wired Backwards??? Help!
  67. Fender Ultimate Chorus chassis removal
  68. Blonde Bassman Wow a lotta gain
  69. Peavey CS800x problem - Smell it getting hot when powered on - HELP!
  70. Something fried in my Marshall "Studio 15"
  71. Peavey Triumph 120 channel switching problem
  72. needed schematics yamaha undred 115
  73. Mackie SRS1500
  74. Deluxe reverb V5 pin readings way off
  75. Markbass Little mark 800 tube manual?
  76. Polytone Mega-Brute clipping early
  77. Acoustasonic 30 DSP
  78. Heads up: Mar$hall Valvestate pwr switch source
  79. Whats a good approach to fixing solid state output stages
  80. Ramsa WP-9110 amp runs warm when idle
  81. Low headroom from Sunn Solos II
  82. Vox Cambridge 30 Repair/Questions
  83. VHT G100-CL Bad Sound Issue
  84. Sveltana Wing-C tubes out of production
  85. Peavey ultra 120 + no sound/ only two preamp tubes glow
  86. Magnavox Astro-Sonic wont spin at slower speed settings
  87. Old tube amp sounds good only at full volume
  88. Jfet muting
  89. tubes redplating when signal applied
  90. Mesa Boogie F-30 Issues. Need urgent HELP. Please...
  91. Traynor YGM3 very low volume
  92. Vendor for Eyelet Fiberboard Needed - Mine is out of stock
  93. DR normal channel problem
  94. Blackstar Artisan 100 OT
  95. Fender Super Reverb RI rattling
  96. Source of Ampeg switches
  97. A question on hum ?
  98. JBL SF15
  99. Mitchell "Deluxe" combo amp
  100. Source for Transformer
  101. Schematic for a Crate GFX50
  102. 5E7 Problem and need help - ratty distortion at all volumes (Other post disappeared)
  103. 75 Deluxe Reverb
  104. Vox AC50 CPain in the &^%
  105. Crackles/Pops in JCM800 Build
  106. Ashdown ABM 500 EVO Issue
  107. Sudden volume jumps
  108. Korg C-4000 digital piano, no sounds
  109. Original Marshall Tube Identification Question - JCM 800 4010 (2204 Circuit)
  110. Another new build 5E7 problem thread - ratty terrible distortion at all volumes
  111. Alto PBM8-250
  112. Marshall MG50CFX
  113. Marshall JTM 60 filter cap and Bridge rectifier advice
  114. effects loop
  115. Marshall tsl122 Bias problem
  116. Fender Twin Power Transformer - is she dead Jim?
  117. Magnatone Ultralinear OT tap identification
  118. Bad crackling noise with larger input signals, New build
  119. remove post, fixed
  120. Anyone work on a Fender red knob Super 60?
  121. 5F6A - hum with added gain stage
  122. Very Low volume problem
  123. Kustom 2x10 Amp Issue
  124. Very Low volume problem
  125. Marshall VS65R valvestate Output transistor biasing
  126. Marshall gold-back 12" speaker testing
  127. Blues Jr power tubes not lighting up
  128. Bad hum on initial power up/first bias setting
  129. Bugera amp issue
  130. Fender Champ Capacitors and other issues
  131. Will Tung Sol 7581's work in my '83 Fender Concert II.
  132. Bias issue
  133. Helllllllllp !!!
  134. Power switch for Valvestate: Source?
  135. Wall isolation transformer
  136. Testing an output transformer...
  137. Ampeg BA115HP tuner oscillations
  138. Ampeg B5R: Overdrive channel always on
  139. Fender Super 60 Voltage Questions?
  140. Ampeg SB12 volume pot hum... but only when turned down?
  141. DC on opamp outpin
  142. Marshall dsl 401 reverb
  143. Hum in Fender Vibro Champ
  144. rec 4 replacement PT Ampeg B15--Edcor?
  145. How do I check output voltage on my Marshall Super Lead 100 vintage 1971 head?
  146. Elk Echo Sonic, anyone?
  147. Fender 65 Deluxe Reverb
  148. Benefits of using a scope?
  149. do I really have to pull the ckt bd to change the PT in Ampeg B15?
  150. Ampeg SVT CL
  151. Acoustic 117 rectifier specs
  152. Compu-Bias Meter Chip ?
  153. Mesa Boogie Recto 3ch - NO clean channel
  154. JCM 2000 TSL 122 FX Loop Buzz
  155. 117 volt transformer for a Marshall Valvestate VS100R
  156. Bandmaster Reverb Issue
  157. Old Peavey Minx sputtering at high volumes
  158. Crate vintage club 30 no sound
  159. Road King II conversion from 110v to 240v with TAD Power Transformer
  160. SVT-VR hum question
  161. Ampeg SJ12-T Trem on the fritz
  162. peavey musician mark III 400 GH 1978... loud constant buzz
  163. Reverb shuts off when amp gets hot
  164. Road King II Power Transformer Change from USA to 240v
  165. JJ vs F&T 100uf/100uf cap cans
  166. New Tool For The Amp Toolbox
  167. Marshall JCM600 heater fuse blowing
  168. ab763 clone's volume is cutting out at high volume
  169. Bugera 1960 Swap out 5881s for 6L6GC Tubes - Necessary Mods?
  170. Sunn 200S
  171. AB763 Twin - Buzz when installed in cabinet only.
  172. Supro Thunder Bolt Cutting Out
  173. Bass cab making 'whoofing' sound. Specs included. What am I doing wrong?
  174. Warwick CL
  175. Selmer 100watt PA/4 motorboating ??
  176. Crate onboard amp tuner flashes, but does not work
  177. Need Help with Sick Working Dog Boxer - Anyone have one?
  178. Marshall jcm 2000 Dsl 100 problem red plating out put tube need help!!!!!
  179. Laney BC 75 schematic ?? Any one have a copy ??
  180. fender deluxe vintage modern
  181. Pot designations
  182. Webster 166-1 volume issue
  183. Yamaha/Phonic 740 info?
  184. Reading this forum in linear mode:
  185. Mesa Hearbreaker Intermittent Volume Loss
  186. Guyatone Flip MKII GA-2000 Amp - screen resistor values?
  187. Silverface Fender Twin has nasty bass distortion
  188. 90s Fender Pot
  189. Crate gt212 volume dropping
  190. Crate BT220 disassembly
  191. Welcome to Tech Jeopardy, I'll Take Transformers for $50 Alex
  192. Peavey classic 30 ghost note
  193. Peavey Mark III Loud 60hz? Humming
  194. Ampeg AM radio
  195. which are the decoupling caps?
  196. Crest CC2800 Help!
  197. Classic Rock in my Amp
  198. Peavey Classic 30 low output, what am I missing?
  199. Fender 6G6 Build w GZ34 - Transformer Suggestions?
  200. '63 Fender Bassman Brownface Project Needs A New Faceplate
  201. Mullard 12AX7 RI issue
  202. Switching Circuit Hum
  203. What's this in a Mesa?
  204. 1975 Fender Pro Reverb P/P Master w/5AR4 - Schematic?
  205. Laney AOR Series Pro Tube 50 power transformer specs
  206. 75 Bassman Ten normal channel bass control not working.
  207. Fender stage lead II channel switch
  208. Laney VC15 channel switch problem...??
  209. Sound City - Concord - Tube Amp - No Signal - Please HELP
  210. GK400RB-III 1 output blown
  211. Lone Star Special screen resistor value
  212. Fender Blues Junior
  213. Fender Electronic Echo Chamber
  214. I dropped my amp and now it hisses again! Help!
  215. Gibson G 30
  216. Can cap replacement for 78 Vibro champ
  217. Strange sounds from a Peavey Butcher
  218. Need help with EA-28RVT Epiphone
  219. Ampeg Gemini 2 standby switch
  220. blues jr - 20v difference on each side of OT
  221. De-humming an Ampeg B-12-XY...........
  222. Hiwatts"Custom 20" ptp
  223. Silverface Champ PT wiring
  224. Bugera joke?
  225. Maine Amplifier Reverb Tray
  226. Am I burning up my EL84 tubes with a 439V anode?
  227. Traynor YGM-4 Hum
  228. Powerup thump Valvestate 8200
  229. Orange Tiny Terror 7/15 watt..... power but no sound
  230. Fender TV front pro amp serial number 733 need speaker
  231. Ideas for intermittent on Gallien Krueger 1001RB
  232. 5E3 using Hammond 291BEX
  233. Traynor YBA-3 Power Xformer making arching noise, Is it about to fry?
  234. 1M pots measuring 500k...? And other pot problems.
  235. What can you tell about a power tube's condition when visually inspecting it?
  236. Marshall dsl 100
  237. Ampeg v-6b multitap inductor replacement ideas?
  238. Dead Selmer treble 'n' bass 50 SV
  239. Valve orientation tab broken... recommendation
  240. Fender Super Reverb RI ugly low volume distortion
  241. Pignose Swallows 30 Watt Speaker
  242. Princeton Silverface Reverb Problem
  243. Peavey 5150 II no sound. SEARCHED ALL OVER! PLEASE HELP!
  244. Low bias on Rivera Pubster
  245. Fishman Loudbox Pro - intermittent output
  246. Fender champ 25 '92 bias
  247. Bad House Power Causing Bad Tone?
  248. Replacing 6L6s with 5881s - JMF Spectra 60t - No Bias Adj - Mod Suggestions?
  249. Getting shock on input jack of a Canadian-Noname-Pepco
  250. Univox U-45B Low, Distorted Output