MontanaWay wrote:TN Allen wrote:Before looking more carefully at the Tubes4hifi MK3 photos and noticing the quad capacitor is 80-40-30-20, I bought a quad capacitor similar to what was used in the original MK3, 30-20-20-20. I'm wondering What advantage the 80 & etc capacitor provides over the original?
a lot of components used in the original Dynaco amps as well as preamps were a compromise, mainly based on cost savings. The 30-20-20-20 is probably absolute minimum. Going somewhat higher, ie 80-40-30-20 gives the amp more 'stored energy', having to rely less just on the transformer to power the unit.
Of course, having said that, there is a limit too, going to high is no good either. I would NOT use the 30-20-20-20 in this amp, so you'd be better of getting the 80-40-30-20, get the higher voltage unit too, costs a but more, but gives you that margin, especially during power up!
Thanks. This one: http://www.dynakitparts.com/dynakit-products/capacitors/MULTI-ELECTROLYTIC-C