Comments on: Billm Clean Boost Module http://billmaudio.com/wp Small amps, big sound. Wed, 08 Sep 2010 00:19:31 -0400 hourly 1 http://wordpress.org/?v=3.0.1 By: bill http://billmaudio.com/wp/?page_id=105&cpage=1#comment-12593 bill Tue, 31 Aug 2010 15:02:47 +0000 http://billmaudio.com/wp/?page_id=105#comment-12593 You can "de-fat" the Fat switch by replacing the 22uF bypass cap that the Fat switch turns on/off with a smaller one, perhaps 4.7uF or 2.2uF. But if the amp sounds farty on the low end, you should probably do the basic mods and TwinStack to clean it up. Then decide whether the Fat switch is more useful. I don't recommend rewiring the Fat switch to control the Clean Boost. It's actually easier to replace the existing jack with the stereo jack kit. You can “de-fat” the Fat switch by replacing the 22uF bypass cap that the Fat switch turns on/off with a smaller one, perhaps 4.7uF or 2.2uF. But if the amp sounds farty on the low end, you should probably do the basic mods and TwinStack to clean it up. Then decide whether the Fat switch is more useful.

I don’t recommend rewiring the Fat switch to control the Clean Boost. It’s actually easier to replace the existing jack with the stereo jack kit.

]]> By: Rusty Milner http://billmaudio.com/wp/?page_id=105&cpage=1#comment-12568 Rusty Milner Tue, 31 Aug 2010 03:09:26 +0000 http://billmaudio.com/wp/?page_id=105#comment-12568 Bill, Is it possible to make a Mod to the Fat Boost that would tame the low end when in use? Also for those who like the Fat Boost on all the time, can your Clean Boost be wired to the existing Foot switch? Bill, Is it possible to make a Mod to the Fat Boost that would tame the low end when in use? Also for those who like the Fat Boost on all the time, can your Clean Boost be wired to the existing Foot switch?

]]> By: bill http://billmaudio.com/wp/?page_id=105&cpage=1#comment-11501 bill Tue, 17 Aug 2010 15:16:33 +0000 http://billmaudio.com/wp/?page_id=105#comment-11501 Instead of changing the size of the cap, the Clean Boost includes a trimpot so you can set the amount of overall boost. In this stage of the amp, there is less bass boost than what you'd get in the preamp, as with the Fat switch. Instead of changing the size of the cap, the Clean Boost includes a trimpot so you can set the amount of overall boost. In this stage of the amp, there is less bass boost than what you’d get in the preamp, as with the Fat switch.

]]> By: EricL http://billmaudio.com/wp/?page_id=105&cpage=1#comment-11361 EricL Mon, 16 Aug 2010 20:23:09 +0000 http://billmaudio.com/wp/?page_id=105#comment-11361 Ok, I think I got it. This is the cap in parallel with R17 (or R10 for the fat switch) that makes the difference. The bigger, the more bass (and vice versa). Am I right ? Ok, I think I got it. This is the cap in parallel with R17 (or R10 for the fat switch) that makes the difference. The bigger, the more bass (and vice versa). Am I right ?

]]> By: bill http://billmaudio.com/wp/?page_id=105&cpage=1#comment-11242 bill Sun, 15 Aug 2010 19:28:36 +0000 http://billmaudio.com/wp/?page_id=105#comment-11242 The boost module is more easily switchable and includes tone shaping. The boost module is more easily switchable and includes tone shaping.

]]> By: EricL http://billmaudio.com/wp/?page_id=105&cpage=1#comment-11069 EricL Fri, 13 Aug 2010 19:04:27 +0000 http://billmaudio.com/wp/?page_id=105#comment-11069 Hello Bill. Congratulation for all your work on the fender amps and the kit you offer. Fine new web site too. I was wondering what makes this boost clean compared to the fat boost since the circuit is very similar to the "fat switch", but working not on the same tube. Thanks, Eric Hello Bill.
Congratulation for all your work on the fender amps and the kit you offer. Fine new web site too.

I was wondering what makes this boost clean compared to the fat boost since the circuit is very similar to the “fat switch”, but working not on the same tube.

Thanks,
Eric

]]> By: Karl http://billmaudio.com/wp/?page_id=105&cpage=1#comment-10990 Karl Thu, 12 Aug 2010 17:57:58 +0000 http://billmaudio.com/wp/?page_id=105#comment-10990 If you want to drive the output tubes harder, why not just change the resistive attenuator that includes the master volume control? You could swap out a few resistors; there's plenty of gain from the preamp amplifer stages. If you want to drive the output tubes harder, why not just change the resistive attenuator that includes the master volume control? You could swap out a few resistors; there’s plenty of gain from the preamp amplifer stages.

]]> By: John http://billmaudio.com/wp/?page_id=105&cpage=1#comment-5872 John Mon, 10 May 2010 00:09:11 +0000 http://billmaudio.com/wp/?page_id=105#comment-5872 It does exactly what is says on the tin. Great mod! It does exactly what is says on the tin. Great mod!

]]> By: bill http://billmaudio.com/wp/?page_id=105&cpage=1#comment-1970 bill Mon, 16 Nov 2009 22:50:46 +0000 http://billmaudio.com/wp/?page_id=105#comment-1970 Sure, you can just ground the blue wire and it'll be on all the time. Or just leave the presence control pullswitch in the up position. Sure, you can just ground the blue wire and it’ll be on all the time. Or just leave the presence control pullswitch in the up position.

]]> By: Scott Pope http://billmaudio.com/wp/?page_id=105&cpage=1#comment-1963 Scott Pope Mon, 16 Nov 2009 06:55:25 +0000 http://billmaudio.com/wp/?page_id=105#comment-1963 Bill, if the audio taper gain and master volume controls are both installed, is there anything to keep from installing the clean boost and hardwiring it so it's on all the time? With the new TO20 or TO22 transformer, it seems like that would be a mod you would want on all the time if you wanted your BluesJr to hold its own with something like a Blues Deluxe, or a JTM45 or such on stage? Bill, if the audio taper gain and master volume controls are both installed, is there anything to keep from installing the clean boost and hardwiring it so it’s on all the time? With the new TO20 or TO22 transformer, it seems like that would be a mod you would want on all the time if you wanted your BluesJr to hold its own with something like a Blues Deluxe, or a JTM45 or such on stage?

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