I recently picked up a pristine Blues Junior III on my local CL for $300 (total bargain) to replace a Super Champ XD. The BJr sounds great with my Tele, Strat and Tokai Love Rock, not to mention it takes pedals very well. The only real weak spot on it was the stock Accutronics reverb tank. I did a bit of research online and read about the MOD replacement tanks. I ordered one (about $22 shipped) and spent a whole 5 minutes swapping out the stock tank with it. What an amazing difference the MOD tank made! I can now turn up the verb past 4 without it farting out and sounding sloppy - in fact it sounds downright great across the dial. I turn it to around 9 (1am on the dial) to get that drippy 60s surf reverb sound. I highly recommend this easy upgrade for anyone with a BJr.