I don't work on too many DRRI Fender amps, but I ran into something that caused me pause.
Typically, in the original BF and SF amps, Fender used two 70uf/350VDC electrolytics in series for a resultant 35uf/700VDC primary power supply cap. But here in the DRRI, they used a 220uf/100VDC cap in series with a 47uf/500VDC cap. Technically, this would equal 40uf/600VDC. This use of misbalanced caps had never occurred to me.
![Shocked :shock:](./images/smilies/icon_eek.gif)
I find it interesting and something worth sharing. Amazing to me how the bean counters and the circuit designers can get together on something like this. Does it alter the sonics of the original design I dunno.
Most people stall out when fixing a mistake that they've made. Why?