oldschoolpunk
dog boy
As my first venture in a long time back into tubes I am recapping a small 6bq5 se. The coupling caps between the driver (12ay7) and the 6bq5 are only .02uf@1000vdc.
In searching the web I found a lot of old amps that use a smilar small value coupling cap for both hifi and guitar ( my amp is hifi). However I found this comment
http://www.harpamps.com/weber/Guitar51.htm
Am I right that in the lower the frequency the greator the voltage drop across the coupling capacitor ( in effect increase the lowend rolloff with the cap) :thumbsdn: ? If I raise the value of the coupling cap could I increase low end response and conversly at the same time could I use it to trim any 60 cycle hum rather then a choke :thmbsp: ?
Man, and I thought I had it tough when I was building speakers :scratch2:
Tony
In searching the web I found a lot of old amps that use a smilar small value coupling cap for both hifi and guitar ( my amp is hifi). However I found this comment
atLarger than normal coupling caps. The exact value of a coupling cap determines how much lower frequencies get through the circuit. Larger values simply let more signal pass. Through experimentation, I found the .1 uf coupling cap to be best for harmonica. Of course, if you were modifying an existing guitar amp, you would simply change the coupling caps (typically .01uf or .02uf and sometimes .047 uf) to a .1 uf. You would use a 400 or 600-volt rating.
http://www.harpamps.com/weber/Guitar51.htm
Am I right that in the lower the frequency the greator the voltage drop across the coupling capacitor ( in effect increase the lowend rolloff with the cap) :thumbsdn: ? If I raise the value of the coupling cap could I increase low end response and conversly at the same time could I use it to trim any 60 cycle hum rather then a choke :thmbsp: ?
Man, and I thought I had it tough when I was building speakers :scratch2:
Tony