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View Full Version : Amps/Cabs Tech Corner: Amplifier, Cab & Speakers Tech Discussions


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  1. Amp Footswitch conversion - components questions
  2. Cleaning a speaker?
  3. JCM 800 4104 (2204) Mod Question
  4. Just got a bias meter - uh oh
  5. mallory or cornell dublier caps?
  6. Amp won't turn on
  7. Power Scaling or My Vibrolux
  8. Right tube for reverb driver
  9. JCM800 tone stack question
  10. Hopeful quick trouble shoot: Princeton Reverb- tube & no sound
  11. EL-34's vs. 6L6's
  12. TRRI output transformer change
  13. fixed bias with 6L6s
  14. Vibroverb buzzing at high volume--help!
  15. In praise of SRS Dual Bias Tool
  16. Microphonics & those metal tube holder/cover thingies...
  17. raw control? (I'll ask it)
  18. ohm
  19. add an EF86 to your tube amp
  20. Tube discussion
  21. Can an OT be "sorta" bad?
  22. this is what I've been told about turning a valve radio into an amp...
  23. Help!!! SOS!! Deville is broken!
  24. Orange Tiny Terror clone problems...help!
  25. Is it OK to turn your amp on with preamp tubes removed?
  26. Need EL84 tube recommendations for my Night Train
  27. Victoria 50212 Lo Powered Twin Humming
  28. Vibrato in '62 6G7-A Fender Bandmaster not working
  29. JCM 800 - cut out, now I get almost no volume
  30. Tweaker multi cab impedence issue
  31. slave resister
  32. 3k or 4k
  33. fender/ rhodes satellite speakers
  34. Speaker magnet fell off in shipping!! Need advice please!!
  35. Tube Tester ?
  36. Princeton Chorus Shutoff Problem
  37. Marstran or Metroamp's Transformer/Choke
  38. 70's Bassman 100 Head advice
  39. Help! Just dropped amp and broke...
  40. Where can i get these capacitor values? NYC-are would be best
  41. Victoria 35210-T- some advice
  42. An Amp Intervention: TGP edition
  43. So how loud is a 45W amp anyway?
  44. In-amp power filtering for $5?
  45. Excellent Amp Repair in Charlotte?
  46. Bias Meter Recommendation
  47. Marshall JCM800 problems this morning
  48. Blue Halos and Soft Valves.
  49. Bought a Bias Tool now what???
  50. deepening tremelo in deluxe reverb
  51. Blonde'n a Blackface Bassman?
  52. 6L6GC cathode bias resistors
  53. Show us your current project
  54. Vintage amp maintenance and use
  55. Tubes and clarity of tone
  56. Fender Princeton 72
  57. Sunn Sonaro constantly blowing fuses......
  58. Plate V vs Screen Grid V
  59. a funny little tube problem
  60. need a quick volume box
  61. weird ringing on high b note...
  62. What causes screen resistors to blow?
  63. Grounding a 2 Prong Plug?
  64. pre-amp tube ID
  65. kt88
  66. Calculating PT current requirement
  67. Learning how to build guitar amps, how?
  68. looking for odd parts (pots)
  69. 78 jmp has a low freq noise problem
  70. Help me find Amp build plans
  71. Distortion "Underneath" Clean Tone?
  72. UPDATE: Thick layer of foam as 'tube rattle' dampener?
  73. Another hum question--
  74. The two webers
  75. How do you replace the bass pot in a Fender Blues Junior?
  76. favorite JTM45 mods?
  77. volume drops - AC30
  78. Ohmite resistors
  79. reverse phase spkr cables-Do I need one?
  80. Matched Power tube pairs... placement in 100watt amp
  81. Reverb honking on Silverface Super
  82. Help ID this mystery NOS 12ax7 that sounds fantastic
  83. Single ended amp questions
  84. Rectifier shorted, amp still works...
  85. Tube Amp Idiot...
  86. My drive channel won't work!
  87. Blues Deluxe Reissue, roaring static after 2 mins
  88. Marshall 401???
  89. Huh? CRYSTALS formed in power tube--with picture
  90. Added Speaker To Bassman Ten- Now Amp Hums
  91. 2x12 Baffle Thickness?
  92. Old 6L6 - from a 30s radio.
  93. Weird old amp...Questions to start the project
  94. Peavey 212-Repair/Troubleshooting
  95. TAD EL84's
  96. Cathode bias questions
  97. Can you identify these tubes in my Vox AC30C2?
  98. Blues Deluxe Power Section Failure
  99. EL34's in JTM 45
  100. Pulling power tubes...
  101. Filtering SE hum?
  102. Mismatched 5E3/5F4 35 & 20 watt transformers 6L6 GZ34 Hot?
  103. Scratchy Sounds At Gig Volume
  104. Bias probes- ma vs. mv ?
  105. Marshall JCM 800 + Marshall 40 Haze KT88's tubes pedal idea question....
  106. Bias supply capacitor value
  107. egnater tweaker tubes glowing blue
  108. TUT books
  109. loop box
  110. Help, Drowning
  111. How do I make my Pro Reverb "tighter" sounding?
  112. Cap change issue
  113. traynor YGM-3 schematic/capacitor voltage question
  114. Blowing HT fuses on Bogner Shiva
  115. Mesa Heartbreaker Fuse?
  116. Budda Superdrive 30 Volume mod
  117. Hum, Hiss, and Buzz from amps
  118. Hey Randall, While You're Here....
  119. Furman power conditioners
  120. How to install a shorting jack/speaker out?
  121. Budda SD45 technical issue. Need help!!
  122. Tube Amp Doctor tube labelling
  123. SCXD issue
  124. Purpose of center tap on filament winding?
  125. malfunctioning ext. speaker jack?
  126. ground hum from effects loop
  127. Matching Tubes.... help!
  128. Carvin Legacy (First Generation)
  129. vintage 66 Super Reverb Static
  130. Peavey Classic Footswitch?
  131. Hiwatt style transformers
  132. Amp builders and repairmen- Show your work stands (chassis holder stands)......
  133. Amp crackles when tapped!
  134. Bogner OS 2x12 cab for XTC Classic
  135. 12" speaker for my velocette 12r combo
  136. Marshall solid state 1986 "vintage" question
  137. Slow day question about dividers
  138. Amperex 12ax7 Identification Help
  139. Carvin MTS 3200 mods?
  140. Need help with RI Bassman
  141. Replace 5U4GB Rectfier W/SS?
  142. best "cheap" oscilloscope for amps&ep3 repair&maintenance ??
  143. 60s Ampeg question
  144. Fender Showman - what happened?
  145. Which Caps To Use?
  146. power scaling vs. attenuator
  147. 12AX7 or SBK11
  148. Fender Champion Amp
  149. 6ls7
  150. Transistor question
  151. Electrolytic capacitor mounting
  152. advice on super reverb project
  153. Changing Power and Rectifier Tubes on a Super Reverb
  154. 1968 Fender Super Reverb (blackface with silver plate logo)
  155. Plexiglass and Paint
  156. ac15cc went off the deep end
  157. 6K6 in Tore-Vibe?
  158. Component spacing on board
  159. Reverb "hiss"??
  160. swapping power tubes without rebiasing?
  161. Effects loop help
  162. Can you blow up an amp with a fuzz pedal?
  163. Quick question about Blues DeVille and Marshall Cab
  164. Headphone trick
  165. Egnater Rebel 20 blowing fuse
  166. Dr Z Galaxy
  167. Speaker Connection
  168. Did I fry my Pro Jr for good?
  169. I got the Amp Farts
  170. 1962 Western Electric 106A amp with 4 in. Jensen Special Design speaker
  171. Need tube chart for BadCat Cub 2R
  172. 5E7M bright channel has raspy cracklin...
  173. Wanted: Schertler David Schematic
  174. Can i use a regular 1/4"guitar jack
  175. Fender Bandmaster 72 recap issue, help
  176. Amp at 240V plugged into 230V wall socket - any issues?
  177. Who said Sovtek 6V6's were bad? lol!
  178. Blues Junior trouble
  179. 7591 question
  180. Where do you buy your EL84's?
  181. Strange sounds from my Carr Slant 6v
  182. 72 Super Lead Toasting Power Tubes
  183. Anybody have a schem for or worked on a handwired Ashdown Peacemaker?
  184. Help with 1/4" phone jack plastic
  185. Ohm question, running two cabs:
  186. Standby switch
  187. Selector switches
  188. Fender Champion 600 mods!
  189. Could someone explain amp classes to me?
  190. Ungrounded power amp with PA?
  191. How to modify a regular speaker to a flux density modulation speaker?
  192. Egnater Tweaker Hiss
  193. Plate Voltage for Brown Princeton 6G2
  194. So I just changed my amps rectifier tube and guess what happened..
  195. Back panel screws stripped
  196. late '70s hiwatt 2 input preamp tagboard questions
  197. Effects Loop ID..w/pic
  198. 6u10
  199. 8 ohms to Twin Reverb?
  200. Should I bleed the caps before changing tubes in an AC15 HTVH?
  201. DIY 5E3 Problem
  202. Fender Princeton Non-Reverb Mod question
  203. SS to tube rectifier?
  204. How to test if a speaker is dead
  205. Need Help - NADY XA-300 Strait to Protect
  206. Is my AOR 30's transformer smoked?
  207. speaker screwed into baffle = way more cab vibration?
  208. Amp buzz in pentode mode but not triode mode?
  209. Burnin' Hot
  210. Fender Tweed Tremolux Bias
  211. Bias supply resistors in 74 JMP MII 50wt
  212. 6G2 Clone Problem
  213. Have to rebias when changing Phase inverter tube?
  214. unmarked ohms on speaker cabinets
  215. 1946 Epiphone Electar Zepyhr
  216. Help Me "Hot-Rod" the Bass channel of my AB165 Bassman!
  217. Fender Tweed question...
  218. Effect of line voltage on bias?
  219. Late 60s, early 70s Fender cab info?
  220. Prince vs. Deluxe
  221. Twin woes
  222. 5w peavey pinching distortion/low volume
  223. Added a Line out for Gibson GA-17rvt Scout
  224. ampeg svt or vt 40
  225. Cabinet Wiring Question
  226. the eccentric 6sj7 tube- any reccomendations?
  227. Grill Cloth
  228. Mark IV Pot Repair
  229. Tweed Deluxe - speaker mounting...
  230. need help finding one of those metal tension tube holders
  231. Understanding power transformers
  232. 65 Vibro Champ mod. Whatizit?
  233. Dr. Z Schematic
  234. SWR Bass 350 conks out
  235. output transformer and speaker loads
  236. Change rectifier when going from 6L6 to 6V6??
  237. 6L6 vs. KT66
  238. Q: NOS EL34s matched pairs v. matched quads?
  239. 1965 Ampeg Rocket 2 60-cycle hum
  240. how to test an old amp without inputting a signal
  241. Opening up a crate vintage club 20
  242. Ressurecting Old Amplifier
  243. Tremelo experts? Fender Tremolux - Trem troubleshooting
  244. Play-testing an amp with fried screen resistors
  245. RCA blackplates V>S> greyplates
  246. Gigaohm resistors??
  247. bias circuit problem
  248. Tube "Gunk"
  249. Impedance selector versus independent jacks
  250. Ground bus/star ground chassis connection