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


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  1. Marshall 1987x FX loop woes.. ;[
  2. Switchable Bias Resistors and Other Tweakables
  3. another preamp tube question.
  4. Amp Guru in Toronto?
  5. Laney LC15R and 1x12 cabinet:- bypass internal speaker defeat?
  6. PSU question for amp designers
  7. Undesirable noise from tube amp
  8. Adding an FX loop to Allen Old Flame?
  9. Amp tremelo ?
  10. Stand-by not really standing by
  11. Best New Production 6550 or ?
  12. Vaunted Blue Mallory Caps....
  13. 25 or 50 watt 12F150 in my SFDR?
  14. TSL 60 Volume question
  15. Mojave Line out?
  16. Standby - tube saver at shut down??
  17. Help diagnose hum problem
  18. Any good places to buy parts in Toronto or...
  19. EVH 5150 III change to EL34's?
  20. Engaging the vibrato in a BF Fender
  21. My first time biasing new tubes...
  22. Why did I wait?
  23. Brimar 6V6GT's or Sylvania 6V6GTY's ?
  24. Replacement Baffle Source?
  25. opening a traynor head
  26. So, what's the most effective way to reduce the gain in the MV section of my amp?
  27. What Does JAN mean regarding NOS Tubes?
  28. Is this a Dumb Question?
  29. Vox Ac15 1959/1960 schematic differences?
  30. Is there something wrong with my Biasrite?
  31. Help me with my tone stack.
  32. Technically, Why Does MV Get a Bad Rap?
  33. Amp tech ?
  34. Cutting an old Chassis?
  35. Vibrolux voltage measurements
  36. Univalve Issues
  37. Best books on Vacuum tubes?
  38. NOS Sprague 'black beauties' - Would they still be good?
  39. Fender Champ - Extension Cab suggestions?
  40. Strange glowing plate problem - help.
  41. Spray cleaner : Which for tube sockets, which for potentiometers ?
  42. 6V6s vs. el84s
  43. Reducing Volume
  44. 7199 to 12ax7 swap; is this possible?
  45. 64' Princeton Question
  46. Dr. Z Maz Sr. Blowing Fuses!! Help!
  47. Cleaning up an echoplex...
  48. Unwanted volume decrease
  49. Fender Twin Question
  50. 1973 Bassman 50-Potential mods?
  51. Why Few PPIMV in Production amps?
  52. Do power tubes affect tone?
  53. Super reverb baffle question
  54. '76 SFPR Way too much Bass
  55. Celestion Blue vs. Weber Blue Dog.....
  56. Scratchy Sounding Jubilee.....Help Please!
  57. What exactly is this piece? (ground buss?)
  58. What can I expect from changing the baffle?
  59. Bridged two Metal Can Cap prongs...what did I break?
  60. Tuberolling in a Vibro Champ
  61. Can someone recommend a good Soldering Gun?
  62. Reccomend me some tubes (64 Vibroverb)
  63. What to do with a single Sylvania 6L6GC
  64. Marshall rivet extraction and replacement...
  65. Can/should I fix...
  66. Finding a Bad Tube?
  67. Tube Getters burned up
  68. A few tube noise/general tech questions...
  69. What is the tube order in an Ampeg Gemini VI?
  70. What's a good EL34 for mids?
  71. Squealing Power Tube
  72. Speaker Effiency Question
  73. Help with a Marshall Lead & Bass 50
  74. Help with a Mesa Boogie Mark III
  75. 6V6 in my Champ has gone cold. Why?
  76. old filter caps and plate voltage
  77. how important is it to use real expensive birch in cabinet making
  78. Help IDing these red coated (ERIE) resistors?
  79. Reduce/Eliminate Power-on Pop on SS Amps?
  80. Why is this cap in JTM45s but not 5F6As?
  81. My latest creation
  82. Crappy Fender Amp Schematics???
  83. Qustion about amp chokes.
  84. How do I know if I have the AA864 circuit?
  85. Question about amp smoking
  86. Mesa 6L6GC,"STR 415" good? junk?
  87. Are power amps the same as heads, in that you have to match ohms?
  88. Static noise on my Hiwatt DR504... please help!
  89. Prefered Solder
  90. Draining Filter Caps Question
  91. 7591 Questions?
  92. Power Supply question, B+ and -?
  93. Speaker wattage
  94. Fuchs Lucky 7 Hiss....
  95. Swap 12AX7 for EF-86?
  96. Souping up a Marshall 2061x 20W amp ?
  97. what effect do LTP PI plate load resistor values have on sound?
  98. Point-to-point Wiring
  99. Ghost notes?
  100. Best solder iron?
  101. Anatomy of a Tube Question
  102. How to bias a 1958 Fender Super
  103. Standby before or after filter?
  104. Help with 12AX7 ID
  105. Mixing a 8 ohm & a 16 ohm cabinet , what setting?
  106. Mr. John Phillips
  107. Recommend a good NOS 12AY7 that won't break the bank...
  108. Tube ID
  109. Unused half of a 12ax7, what to do?
  110. Mesa Boogie Mojo Missing
  111. Ceriatone kit build thread
  112. Dr. Z MAz Jr. Problem
  113. anyone know where i can get a piece of scrap basketweave
  114. Speaker size and treble
  115. how would this be, weber 10A150 in princton
  116. Do amps draw power shut off?
  117. Gibson GA-15 RVT Phase inverter?
  118. Parallel on V1?
  119. Problem with Marshall Valvestate
  120. Weird overtones coming from Superlead
  121. How much do power supply caps matter?
  122. Modding an amp for more gain.
  123. More versatility out of a Marshall JCM 900 SL-X
  124. Do all amps use Slow-Blow fuses?
  125. Princeton Reverb mod
  126. Current (no pun) Manufacture KT66's
  127. Dead Matchless
  128. GT Solid State Rectifier Plug
  129. noise when guitar is unplugged
  130. TOOOOB Questions!
  131. Looking for Gold hardware
  132. Voltage reading trouble?
  133. Mesa question.
  134. 6L6 choices are making my head spin . . .
  135. Which TrainWreck Kit to Buy/Build?
  136. Tube flash
  137. Reverb pan cardboard backing question...
  138. Heater center tap
  139. Do volume pots adjust current linearly?
  140. AC30CC2 Master volume
  141. Salvaging a PT...what to look for?
  142. BF DR external speaker out: what can you plug in there?
  143. Cap Terminology (stupid question)
  144. Tinkle, tinkle...
  145. Room/Ambient Temperature
  146. Help! I just destroyed my Pro Junior!
  147. speaker wattage question
  148. question about self biased guitar amp
  149. Amp Noise du Jour...
  150. JCM900 MKIII output transformer???
  151. Rivera Chubster 6L6?
  152. Swapping rectifiers in a cathode-biased amp.
  153. winged c's in a mesa express 5:50?
  154. know where to get a hickok 6000a serviced?
  155. Power tube spark, blown fuse
  156. Who Makes The Best New Production 6V6GT and 5AR4?
  157. 6v6 Id
  158. Differences in 6L6's?
  159. Tube amp sounds like "frying eggs" ???
  160. Capacitor Types
  161. 62 Bassman Tubes
  162. Biasing a Vox AC50
  163. Got an old Hammond F-100; guitar amp?
  164. Ceriatone Hiwatt?
  165. Is an added FX loop sucking tone when not used?
  166. Please Help! Tube Rattle
  167. Fender Princeton Reverb?
  168. Impedence matching box?
  169. Bias Pot/Resistor Value
  170. Old stock EL84 ID
  171. Jcm 900
  172. stokes mod, princeton reverb
  173. Pleaseeee Helpppp!!!!!
  174. OK FEllow Amp Gurus.... Question
  175. Palomino V32 bias question
  176. Power Filter Caps and Polarity direction w/fender
  177. Another Super Sonic Problem
  178. Power transformer mounting question *help*
  179. Describe the difference between a 6v6 and a 6L6
  180. Baring michrophonics & in refence to orignal mullard 12ax7's
  181. Traynor YBA-1 Bassmaster - what're some cool mods?
  182. Just picked up a 70's Bassman w/master vol
  183. Choosing an Output transformer for upgrade?
  184. 5881 vs el34 reliability
  185. Komet fast gradual fix
  186. Help Troubleshooting: Marshall 1959SLP
  187. bass control on princeton question
  188. Power Tube Compression
  189. single ended amp mods
  190. Need Tube ID Help Please
  191. Deluxe Reverb Reissue Tube question...replacement?
  192. Need help debugging strange noise/performance
  193. I just got hold a some more NOS tubes. Are the 12AV7's keepers?
  194. What is my amp doing?
  195. did my power transformer go ??
  196. Cleaned Tube Pins and Sockets
  197. Loose tube sockets...
  198. Fender deluxe reverb RI problem
  199. How can I best clean tolex and grill cloth?
  200. 18 watt marshall clone issue
  201. Tubes: 12ax7 preamp, looking for a very warm sound
  202. Recommend a Digital Meter for Bias
  203. Weak Tremolo SF Vibrolux Reverb
  204. What Are The Tube Manufacturer Codes?
  205. What controls the voltage here... (pic inside)
  206. Advice on how to get rid of fizz
  207. Looking for Bassman schematic/chasis layout
  208. Where can I get a 240 volt Soldano power transformer?
  209. Too much power filtering....
  210. static coming from my deluxe reverb amp
  211. Advice needed: '63 Vibroverb reissue
  212. Fender Twin Reverb extension speaker question
  213. Can you drive a reverb circuit with 1/2 a tube?
  214. Marshall 1987x woes.. STILL!
  215. Reducing trainwreck clone gain?
  216. New Tubes for a Mesa Mark III... opinions?
  217. Yikes! Can this be good for you?
  218. When is it OK to sub power tube types?
  219. Vishay Dale RN65 resistor max voltage @ 350v? Any Danger to use in plate loads?
  220. lower wattage, simplified Super Reverb: DR's power section?
  221. 6v6 touching speaker magnet?
  222. How do I raise the overal B+ voltage in a Fender?
  223. Can a "high" gain TR Emerald pro be modded to a "low" gain model?
  224. Tube ID Clarification
  225. Anyone here heard of "too much B+ voltage to use a SS rectifier"?
  226. power scaling for Laney vc15?
  227. Ampeg Gemini II Bias Question
  228. champ style build problem
  229. Plexi bright cap
  230. Moving a handle on a speaker cabinet?
  231. Tube Question
  232. What is the best filter cap for a recap on a Hiwatt DR103 ?
  233. DRRI Retrofit
  234. Never Trust a Cheap Multimeter
  235. Caps need replacing? (photo)
  236. Latest 5E8-A build and a cool simple mod for it
  237. Looking for amp tech NW Indiana/Chicago
  238. 65 BF Bandmaster Ohm? Speakers?
  239. Caps Questions?
  240. 250-500pf coupling caps: Best sounding
  241. TAD 6L6: Difference between big and short bottles?
  242. Best current production tubes?
  243. Please explain about transformer size
  244. Does Ruby make the best sounding reverb tanks?
  245. 2 Practically Identical Supers... one sounds different.
  246. think i blew my output transformer
  247. Best Multi Cap Can for BFPR ?
  248. clean chording at low volume and my Chieftain is making crackly sounds....
  249. Late 70's Vibrolux Bias Resistor Value
  250. ID a Vox re-issue please