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View Full Version : Maintenance, Troubleshooting & Repair



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  1. SVT-2PRO Bias Problem: LEDs stay red on one side
  2. Must find replacement power transformer!
  3. HRD V1 troubles no output? Advice needed
  4. Output transformer issue
  5. 2 questions . How do i test decoupling caps and my output for wattage
  6. carlsbro cs40-60 mk1 output tx issue
  7. Anyone have experience with a Fender Champ 12?
  8. Any procedure to test around an output transformer?
  9. Crate Blue Voodoo BV120H on the bench
  10. Peavey Mace Footswitch LEDs ?
  11. 6G3(-ish) Amp Popping Fuses--Need Ideas!
  12. Finished 6G6 Build - But No Bass Response on Bass CH & Too Much Bass on Norman CH
  13. Marshall 1923C ( DSL 50) blows HT fuse
  14. What could this farty little distortion be caused by
  15. HotRod crappiness
  16. Acoustic B200H Service Manual?
  17. Early 80's roland cube 100- Orange
  18. Line 6 Spider Valve HD100 (Bogner) TROUBLE- No output
  19. Peavey Classic 212 VT
  20. Gibson GA45RVT reverb died.
  21. TOA P2122 Schematic?
  22. Roland Cube 60 intermittent internal popping
  23. Roland re201 echo problem
  24. Edison Professional Powered Speaker System
  25. Vox Cambridge 15 and Cambridge 30 reliability upgrades, mods, and tweaks
  26. Ampeg Portflex B-12XT Power tx
  27. Garnet Mini Bass tremolo repair
  28. Orange 200 thunderverb - tube failure
  29. Fender SRM 6302 PA bad hum
  30. Negative Feedback Question
  31. Marshall Vasvestate VS100R Head
  32. Kustom 4 terminal pots
  33. 12AT7 in Univox U-255R runs scalding hot.
  34. Mesa MkV unusual problem
  35. Matching BJT differential pair
  36. Schematic Help Needed Fender Stage 160 DSP
  37. DIY patch cables, major signal loss - what gives??
  38. Head scratcher: 5150 combo bias mod screweyness
  39. Fender Princeton AA1164 1K b+ dropping resistor cooks
  40. Power amp ok on resistive load, but not with speaker
  41. SWR 400 Working Pro
  42. Vox Cambridge 30 Reverb busted
  43. What the ?????
  44. LM3886T Mute Circuit
  45. Valvetech chassis pics
  46. Fender Twin Reissue - No Power, Good Fuses, Inrush Limiter Seems OK
  47. Bogner ecsstacy help please, tubes red plating
  48. Hughes and Kettner 6L6 Guitar Valve Amp- Oscillation/ Rattle/ Reverb Issue
  49. Is this right?
  50. Orange Thunderverb 50 bias - PLEASE HELP!!
  51. Thank you
  52. Ampeg superbreverb Variable Bias Trem/(vibrato) thump all the time, footswitch good
  53. Fender 75
  54. Behringer Amps and Isolated Jacks
  55. Evans Lapsteel amp Fault
  56. VOX AC30/6 TB problems
  57. Output Transformer works but totally cool
  58. Staticy Woosh when turning off standby, background grit: Rivera Fandango 55
  59. 40 watt Sunn amp sounds great but lacks power
  60. Ashdown chassis removal
  61. Marshall 2020 transformer reliability
  62. BA-115HPT
  63. Recommendations for a good epoxy to repair a circuit board
  64. transitor substitution help
  65. Bias probes ?? UK supplier?
  66. Hartke HA-3500 farty noise
  67. 1959 Superlead sounding bad after can cap job
  68. Weber copper cap rectifier - Blown?
  69. Bogner Shiva - reverb issue
  70. Fender optoisolator tremolo ticking/clicking
  71. 1953 Gibson BR9-GA9 hybrid model Low output volume
  72. usa built blues deville 4x10 footswitch problem
  73. Volume fading in and out on a Peavey Vyper 75w combo amp
  74. jcm900 high gain dual reverb very low volume
  75. Fender Red Knob Twin (1987-1994) aka THE TWIN upgrades
  76. Another -15v supply problem!
  77. Fender the twin (1990's) 250k 16mm PDT pots
  78. scope help
  79. Behringer ACX1000 schem?
  80. Music Man 2165-RD Voltage Issue
  81. Bose System L1 Compact Power Stand
  82. Fender Hotrod deluxe noise like popcorn
  83. Got a Crown CE2000 Semi Fixed, Beginner looking for advice
  84. Mojotone CTS pots?
  85. Re-coating burned through PCB trace coating?
  86. Fender Super Reverb RI heating up
  87. NO CHANNEL 2 on MUCH BELOVED FENDER SUPER CHAMP XD.
  88. Laney VC30 112 bias problem (?)
  89. Reverb Tank reqd foruse as test equipment
  90. Plush P1000s on the bench
  91. Svt3 Pro Mosfets
  92. Gallien-Krueger 700RB
  93. Film capacitor
  94. New reverb tank needed?
  95. Replacement knobs for Champion 110 Amplifier
  96. What does this mod do? VH100R
  97. Cant find a OT for DSL401
  98. Gibson Apollo (GA-95RVT) AKA: Nightmare.
  99. Phase inverter, Mesa Boogie SOB
  100. Marshall JCM600 Head Drive channel low volume
  101. Vibrato channel no sound .
  102. How do I easily remove silicone sealant?
  103. Farfisa compact organ.
  104. Semi noisy carvin cx1272
  105. George L's Speaker cables ?
  106. Looking for ED combo amp schematic
  107. Brand new preamp tubes seem to be bad ?
  108. Bench supply recommendations
  109. How do I make this 'widowmaker' safe?
  110. Cathode bypass caps in Bassman 135
  111. '65 SR tranny ticking
  112. How do I rust new screws?
  113. Scratchy, Popping, Distortion in new Pro-Reverb build.
  114. Peavey rockmaster pre amp problems
  115. Hot Rod Deville III V1 random noise and oscillation.
  116. Need good amp tech in DFW area
  117. US Masters TVA30 schematic anyone?
  118. Marshall 6100
  119. HiWatt G15 8 MaxWatt - Gone Silent, chip details needed
  120. Cornford hurricane Blown Mains TX 2nd time
  121. Sessionette Power Amp Replacement
  122. Kustom K250-2
  123. Another MARSHALL Valvestate 2000 AVT150 Blowing fuses......
  124. Peavey Special 2x12 power supply is bad is this an easy fix
  125. Is this scope worth a nickel?
  126. Mesa 50 cal fried resistors continued
  127. Marshall VS 8080 IC1 Blowing.
  128. Quality workmanship.....
  129. What was the hardest problem you ever found and fixed?
  130. Deluxe Reverb schematic discrepancies?
  131. Fender Chamion DSP 30 Channel 2 has no volume control
  132. Best Way To Clean Off Green Powder Dust Off Old Chassis?
  133. 969 Ampeg SVT being snappy
  134. Vintage PA Tube Head Output Question
  135. Marshall 2100 JCM 900 Head Hum
  136. Question about 50s Fender OT ID
  137. JCM 800 2204 Self oscillation problem
  138. Bleed Resistor to Discharge High Voltage Caps in Tube Amp
  139. Crate v18 212 amp wont turn on anymore???
  140. Marshall 8008 Rack mount Blowing transistors
  141. Hughes and Kettner Switch Blade 100 guitar head
  142. 4.6V heater voltage on Fender Pro Tube Twin
  143. blues deluxe 1993 not the reissue
  144. Laney L30B Hums, Blows Fuses
  145. Buzzing first minute or so, Laney VH100R
  146. Sunn Beta Lead - Random but relatively constant crackle on output
  147. Marshall 2100 JCM 900 head oscillating
  148. No volume with Peavey XXL with effects loop in use.
  149. HELP With VOX AC100CPH
  150. Hughes and Kettner Switch Blade 100 guitar head
  151. Fender Hot Rod Deluxe 3
  152. Hum/Buzz When Power Transformer is Grounded to Chassis
  153. 100uf + 100uf caps bigger than 35mm
  154. Anyone Up For A Vintage Tube Swap?
  155. Fuse differences
  156. Fender Hot Rod Deluxe - weird noise on Drive channel
  157. Roland - JC77 potentiometer replacement
  158. SF Twin Reverb with buzzy reverb
  159. Crate VC6210 popped NTC before fuse, need advice..
  160. TSL-60 with vexing farting problem on all channels
  161. Mesa .50 Caliber + Fried resistors
  162. Cornford Hurriance blown tx again
  163. Fender Deluxe 5C3 question
  164. Need help finding pots for Hartke repair
  165. samson s6 distorted output
  166. I Thought It Was a Ground Loop
  167. Ampeg B-200R Dc on output
  168. bad tube with bizarre symptom
  169. PEAVEY XXL head won't switch channels
  170. Peavey 212 clean channel won't work
  171. Plush P1000s on the bench
  172. Strong oscillation in Reverberocket Echo circuit
  173. Fender 6G6-B Bassman hum
  174. Fender Performer 1000 popping on turn-off
  175. Replacement potentiometer for Fender Red Knob Twin
  176. Just shooting the breeze Carvin 400FET
  177. Carlsbro Powerine 800 voltages
  178. Crate Blue Voodoo
  179. SF Twin Reverb Vibrato Hum on Speed Pot??
  180. PV XR600 400R links?
  181. Traynor YCV40 Blown DC Filament Circuit
  182. Circuit diagram for Roland KC-500?
  183. Crate GXT-100W circuit diagram?
  184. Fender Hot Rod Deluxe Issue
  185. SWR LA-15 Stumped
  186. Fender Rumble 100 Bass Amp Problems- Help, Please.
  187. 1974 Garnet stencil 10-PT - AC isolation mod
  188. Cornford hurricane schematic
  189. Ampeg Gemini II 7591 bias questions
  190. Ampeg Gemini II Tone stack question
  191. HK switchblade 50W combo repair
  192. What is wrong with NTE transistors?
  193. Ampeg SVT-300 bias
  194. Amp Static Crackling noises SOUND CLIP ATTACHED
  195. Tweed Bassman clone with harsh breakup
  196. Marshall tsl 100 head loud Clean Channel Hum after it heats up after few minutes on
  197. No volume with Crate GLX1200H
  198. musicman mystery tap
  199. channel switching help (problem with amp)
  200. preamp valve weirdness
  201. Mesa F100 blowing single tube, in same socket, every time
  202. Twin reverb boost oscillation
  203. hartke ha7000
  204. Bugera 333xl-212 cap problem
  205. Could this cause my issue?
  206. Marshall Connector Identification
  207. 6V6 amp cutting out when guitars strings are picked hard
  208. Hafler G300 clipping on negative portion of waveform
  209. 80's Yamaha G-100
  210. SVT3Pro power amp failure
  211. Blackstar series one 50 help
  212. bias issue
  213. Blues Jr oscillation-
  214. Rattling on Fender Red Knob Twin! What could be the cause?
  215. Single Ended Odd Distortion - To NFB or not to NFB?
  216. Fender Champion 30
  217. Ampeg B15 woes.... no sound from guitar
  218. Fender Roc 1000 changing channels when played.
  219. Marshall JCM 2000 trans wires
  220. Marshall DSL short ???
  221. Need 3 Prong Power Conversion - But Heater On Primary Side of Iso Trans
  222. Krankenstein Jr PT replacement?
  223. Marshall VS100 clean problem
  224. Need Bias Help VC50H by SLM Crate
  225. GK 400rb III, heatsink isolated screw
  226. B-15N Power transformer replacement
  227. Current problem with a 6534+
  228. Looking for info on Ampeg B4
  229. Dealing with High B+
  230. Marhsall 100watt 1959 SLP Oscillation?
  231. SVT CL repair - process and safety
  232. Prosonic drive channel week and nasty problem
  233. Fender Super Champ XD no sound
  234. Marshall DSL HELP !
  235. What is your favorite flush cutter?
  236. Mesa Blue Angel burned board
  237. ** The Marshall TSL122 JCM2000 Repair/Mods Page **
  238. Help With Squeal/Crosstalk...
  239. HUM Marshall JMP 50w
  240. hooking up a 3 wire power cabl
  241. Soldano Cuts out
  242. Peavey Valveking died
  243. 73 Fender Silverface Twin Reverb Noise New Findings & Questions
  244. Fender 1961 Concert Brown face 6g12a re-cap time, need input
  245. Twin Reverb PT Surface Temperature
  246. Weird residual voltage problem...
  247. 5e3 build buzzing/overtone noise
  248. Ashdown EVO 500 III Hum
  249. fender prosonic output transformer
  250. AC30 Normal channel ground loop fix