Cone Excursion

[eddiemac]

Thanks. Just one thing: 

"In this case, the cathode bypass resistor is plenty large enough at 250μF . . ." 

Am I missing something?

[Isaac]

No, you're not missing anything. I meant to write, "the cathode bypass capacitor."

[Happy Face]

Great thread! So informative.

[eddiemac]

I replaced the green .0022uF coupling cap with a new Sozo mustard cap of the same listed value.  My Fluke meter reads 3nF on the old cap and 2nF on the new.  I notice an improvement with regard to speaker bass handling now.

Question:  Is that 250uF cathode bypass cap an electrolytic?  It seems to be working fine, but will it need to be replaced some time in the future? 

[Ryan Phelps]

Yes, it's an electrolytic. It's common practice to replace cathode caps when re-capping an amp. Electrolytics have a limited life-span and this cathode cap is pretty inexpensive, so I would replace it.