View Full Version : Mods & Tweaks

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  1. Bias after pulling out two power tubes?
  2. Mod Bass Channel on A Fender Bassman AB165
  3. FX Loop install
  4. Fender Princeton reverb AA764 preamp output jack install.
  5. JCM900 Tone stack mod 4101 50watt combo
  6. PPIMV on a jcm800/2204 yes or no ? .. I don't really like it
  7. Phase Inverter Cathode Bypass
  8. A few simple mods for my Old Canadian Pepco
  9. Marshall JCM800 2210 questions
  10. Voice of Music Model 1450
  11. Want to mod my Diamond SpecOp to Nitrox
  12. EVH 5150 MK3 mini head reducing the gain
  13. Ground reference for DC fan supply?
  14. Taming Fender Red Knob Dual Showman
  15. power tube preference in jcm 900 4500
  16. lowering the presence
  17. ch switch
  18. Importance of grid-stopper in interstage coupling?
  19. Cathode bypass capacitors: Electrolytic vs. film?
  20. Hooking a Charvel to a Fender
  21. Adding spring reverb to a practice amp board already printed for spring reverb?
  22. Mackie Power supply
  23. Metal film cap sizes.
  24. b-52 at112 60 mod for el 34's
  25. Marshall dsl 401 volume OD2 mod.
  26. Tremolo intensity on Univox U42/45
  27. A Cleaner Clean Channel
  28. Mooer Elec Lady Flanger - Volume Drop Mod
  29. Reducing Voltage On Laney Supergroup 60 Watt
  30. Looking for the dookie mod
  31. Sano 50 WRT - convert 8417 to 6550 or 6L6
  32. Can I "Raw Control" or Tone Stack bypass pot?
  33. How to test output transformer performance for overperforming amp
  34. Mads Vox ac30c2
  35. 12AY7 PI tube, good, bad or ugly? Your thoughts please.
  36. 5f1 champ w/electronic reverb
  37. reducing reverb effect in deluxe reverb aa763 circuit?
  38. Champ 600 EQ mod balls-up!
  39. More Thomas Vox repair manuals
  40. Negative feedback, and resonance question?
  41. BF Princeton Reverb - wider range for treble pot
  42. Schematic question?
  43. Preamp stage help please.
  44. Modding gain stage on amp
  45. How does this look for a boosted up reverb unit circuit?
  46. Peavey Delta Blues Distorted
  47. Teach me a little something about NFB in a Deluxe Reverb
  48. 65 ReIssue Super Reverb Midrange Pot change
  49. Tweed Deluxe Coupling Cap Changes
  50. Suggested Mods for Peavey Butcher - Negative Feedback Loop Tone control?
  51. Adjustable bias and measuring points Valve King 112
  52. Peavey Artist VT resonance & presence mods
  53. Marshall JTM 60 choke mod
  54. Peavey Valveking Pre PI Master Volume mod Thoughts?
  55. THD picovalve
  56. Marshall dsl 15 h mod help
  57. Watkins Dominator extra stage?
  58. Power supply filtering
  59. Understanding/improving JTM60 FX LOOP
  60. 5E3 cascading inputs MAD FEEDBACK! Need fix
  61. Replace 2 x12" speakers with 1x 15", possible? Worth it?
  62. adding DC heaters to a high gain 100 watt amp
  63. ValveKing 100 mod questions
  64. Orange Dark Terror. Mod for more resonance.?
  65. Elevated AC heaters?
  66. Mods for a B-52 ST100A (can get one dirt cheap)
  67. Hum/Noise vs shielded cable or twisted wires in a Peavey Triumph 60
  68. A bit confused about V1 and V2 in my Mesa F-50
  69. LED activation from 5v winding?
  70. advice on more bass and treble from "Micro Champ"
  71. effects loop idea
  72. question about mods to valve amps
  73. Inexpensive L-Pads...
  74. Change led color and some mod to footswitch
  75. Hammond / Everett AO-50 conversion to Vox AC15
  76. Mesa Boogie F-50.. what is this?
  77. Question about using relays for foot s/w
  78. Bugera V22 Infinium CHOKE mod
  79. Opinions on a relay activated volume boost
  80. Bright Switch/Cap Wiring
  81. would a Master Volume solve my issue?
  82. MOSFET PI, how to Bias?
  83. Fender M80 Overdrive Channel
  84. Ampeg Ba 210 SP High EQ mod?
  85. Can't Turn Volume Completely Off
  86. Solder Both Sides of PCB?
  87. Adding gain stage to Marshall 2203; handling the 10k cold clipped stage
  88. Adding an on/off reverb switch to vintage amp
  89. Fender Twin Reverb
  90. DSL 100: Changing Grid Blockers and Bias Resistors
  91. Mesa Boogie SPAX7 in a Peavey Valve King Head.
  92. Effects loop on a AC15CHWX
  93. New AB763 Blackface Mods Page (includes DRRI & 68 CDR)
  94. Ampeg B-15 Preamp...
  95. Modding Boost Switch on Bugera V22
  96. 65 Blackface Fender Showman PPIMV
  97. Peavey Valve King 112 Dynamics/Attack/Gain fuzz MOD
  98. Final tweaking of a 1959SLP Re-issue..
  99. JTM60/JCM600 important MODS
  100. Adding a choke to Sovtek Mig 60
  101. I wish I had one of these years ago - '71 Traynor YBA-1 gets Plexi modded ** CLIP **
  102. Peavey Triumph 60 Hum
  103. Fender Frontman Mod.
  104. Removing power valves to reduce output
  105. Fender Reverb Mods
  106. Vox DA5 lineout modification - speaker bypass
  107. Princeton 112 Plus - 50k 15A Volume Pot Mod - Part Number And Source Needed, Please
  108. Possible to add NFB to this schematic?
  109. lower wattage in 5E7A tweed pro?
  110. Peavey Classic 50 Blue Guitar Mods
  111. I think it's attenuater time
  112. Pushing V2 harder within older fenders. Pre-amp clipping mod?
  113. Bassman AA568 unused triode applications
  114. Super Reverb '65 RI - Changing Output Transformer to Match Speaker Load
  115. Log/ Lin Bass Pot (DlxRev).
  116. EL34 in a Champ?
  117. Blackstar Artisan 100 circuit PPIMV and FX Loop Mods
  118. 6150+ Mods and a real engineer guitarist!
  119. Adding Filament Transformer to Sovtek Mig-50. How to place it?
  120. Thank you Valvewizard - Ground, hum blocking
  121. Replacement speakers poll
  122. Bias points
  123. 5150 bias mod
  124. Fender Pro Jr More Bass
  125. Trying New Speakers/replacements
  126. Marshall Amp increase Bass/low-mid response
  127. Can y'all help me with a minor mod to a Peavey Rage 158?
  128. Relay wiring for Vox Night Train mod
  129. Adding additional input output to Line6 spider ii amp
  130. Suggestion for moderator - let's spell "Tweeks" correctly!
  131. Looking for more gain mod schematic jcm800 2210
  132. Negative feedback loop mod for Pro Reverb
  133. Using Combo amp Speaker as Cab
  134. Marshall JVM
  135. Are SoZo blue caps the same as Fender blue caps?
  136. Line out help please
  137. I want to reduce the gain in my Peavey Rage 158.
  138. help with some peavey XXX mods
  139. Simplest way to turn a combo amp into both a head and a cab as well?
  140. Amp Mod for some More Gain?
  141. Bogen PA head for guitar? Help with pentode preamp stages.
  142. Another JTM60 1x12 thread/question... (haven't seen this one)
  143. Fender Blues Jnr Mk3 Mod
  144. What's this JCM800 mod do?
  145. What's this JCM800 mod do?
  146. Supro Inspired VVR Question
  147. MASSIVE improvement to Mesa Boogie SOB mod - How to add a real presence control
  148. Adding tube spring reverb to a Mesa Boogie SOB
  149. 5V4 instead of 5Y3 ?
  150. Bypass Digital Board in Super Champ XD (& possibly others)
  151. Epiphone valve standard to increase the treble
  152. Different Speaker Outputs On Marshall DSL 40C
  153. Help needed to upgrade Capacitors in a Marshall DSL 40C
  154. coupling cap to block some bass?
  155. Hicks mender
  156. 2015 VOX Ac30c2 service manual
  157. Drop preamp voltage
  158. Fun new zener tweak!
  159. Convert 5F6A Bassman into 5F8A Twin
  160. Blues Jr, any mods or advice available to convert tube mount pcb to hard wired?
  161. Newest Peavey Classic 30 - Blue Guitar Mods?
  162. Cathode bypass gain boost questions
  163. converting 6sc7 amp to use 6sl7
  164. 6CA7 tubes something different in the place of EL34 ??
  165. Remove ground lift network? JCM900 dual reverb
  166. Gallien Krueger MB150S-III adding Boost circuit ala GK MB150E-III
  167. JCM900 4500 Mod: C27 Jumper or...
  168. cathodyne/LTP switch (for small P-P amp)
  169. Replacing my tone control with an Orange-style shape control
  170. Project! Convert push/pull 'boost pot' to a footswitchable jack?
  171. Fender Twin bias dilema
  172. Fender Ultralinear - KT66, 77 or KT88?
  173. Improved circuit for power tube tremolo in a fixed-bias amp
  174. Bias test points for PCB amp
  175. Fender Frontman 65R volume mod
  176. Peavey Classic VTX 65 watt combo question for Enzo
  177. Eyelet boarding a reissue amp (Fender)
  178. Which switch for high voltage switching?
  179. Carvin Belair - moding one channel
  180. Sound differences from different dual op amps in SS amps
  181. De-biasing a Peavey Classic VT (6L6 output stage)
  182. Tonestack help
  183. add an attenuator to an existing tweeter?
  184. mesa mk IV bias
  185. Conversion to acoustic amp
  186. Taming Fender Blues Deluxe Abrupt Volume Control
  187. Switchable VTM 60/120
  188. SF Twin reverb Ultra linear transformer Blackfacing
  189. Age Old Problem of TOOO Bright Super Reverb
  190. Deeper voicing on EVH5150iii
  191. Different types of power resistors
  192. What cap value for this idea?
  193. Mesa Nomad 55 Reduce the gain
  194. Vox Escort Mains/Battery amp power upgrade?
  195. Possible wrong installation of diodes in place of a 6X4
  196. Taming a Gibson tone stack
  197. "Tighter" Bass on a Tone King.
  198. Peavey xxx upgrades
  199. Cable runs and effect on tone
  200. Help with mod to Crate FW65 Combo
  201. Mesa .50cal EL84 version bias pot mod
  202. Switch ratings for mods with high voltage
  203. Musicman 75 head 2100EX too much overdrive
  204. Marshall DSL mod
  205. Any ideas for a temperature controlled fan for Bass amp
  206. Traynor YBA-3 dummy load to use 8 ohm cabinet?
  207. Slitting speaker cone or knitting needle ? Kinks content
  208. Vox lead escort 50 - integrating valve stage
  209. LTPI on a 6G2?
  210. Adding a footswitch to a Blackstar HT-1
  211. Fender Deluxe 112 Plus Too LOUD
  212. JCM 2000 Marshall TSL 100 mod to DSL 100 Specs
  213. Built-in solid state reverb circuit for tube amp homebrew...
  214. Reduce treble in Fender Frontman 212r clean channel with circuit mod
  215. Silverfacing a Deluxe Reverb
  216. Crate Vintage Club 30 /50 Remove V1 from the dirt channel to reduce gain
  217. ROLAND BOLT 30- 60 cycle hum...
  218. Fender Bassman AA864 variant - mods
  219. Peavey 6505+ 112 mod for channel balance
  220. Peavey Valveking Modifications
  221. tightening up BF Princeton reverb ?
  222. Best way to increase bass response...
  223. E-Wave DG2-30RH head Clean channel too bright
  224. ENGL E320 clean vol mod
  225. Trem and Bias
  226. marshall 1987x hiss reduction possible?
  227. Slope resistor and cap changes when changing a CF side to a 12ay7/12au7
  228. I wish to modify the tone stack in my Ashdown Mag 300 head.
  229. Using 12AT7 instead of 12AX7
  230. Subbing 12AU7 for 12AX7
  231. Any thoughts on how to "soften" attack on a Fender Bassman ?
  232. Fender Blues Junior excessive treble
  233. Looking for less low-cut in Randall RVC (like RD5C)
  234. Marshall JCM 900 mod
  235. Modding reverb
  236. Marshall Split channel again (some interesting information)
  237. Changing rectifier in a Ceriatone 5f6A Bassman
  238. guitar amp ->PA =cabulator
  239. Optocoupler in Fender tremolo
  240. Bugera 1960 infinium Schematic
  241. Epiphone Valve Junior OT upgrade -- help please???
  242. Hall Amplification VVR3 in Selmer Treble & Bass 50 Mk3
  243. modifying the Fender Greta line out
  244. Wanna help with basic mods...
  245. B+ voltage drop via Zener/MOSFET question
  246. Minimum output impedance for Marshall Lead 12.
  247. Hammond drawbars - guitar
  248. Peavey Bravo modifications
  249. Hot Rod Deville upgrade
  250. Twin reverb new speakers