This is a later view of the HRD III that I modded. The two 100uf filter caps are probably overkill, since only one is already more than twice the original Fender value. You can see I used JJ caps. I'm not sure if I got them from AES, (Antique Electronic Supply: tubesandmore.com), or from Weber Speakers: tedweber.com. I replaced the standard 22uf caps with 47uf or 40uf, F&F caps,. Again, I don't remember for sure which of the above two vendors I got them from.