• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Cathode Bypass Cap questions

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Jump to Latest
dsavitsk

dsavitsk

diyAudio Member
Joined 2005
diyaudio.ecp.cc
2 quick cathode bypass cap questions:

1. is the voltage seen by the cathode bypass cap the same as the voltage dropped across the resistor?

2. to figure out the value of the cap when the plate is loaded with a CCS, do I use

C = 1/(2 * pi * Hz * R)

where R is simply the value of the biasing resistor -- essentially the plate load resistor is infinite due to the CCS?
 
I

ilimzn

Member
Joined 2005
dsavitsk said:
2 quick cathode bypass cap questions:
1. is the voltage seen by the cathode bypass cap the same as the voltage dropped across the resistor?
Click to expand...

This is a redundant question with an obvious answer - of course the voltage is the same since they are connected between the same two points! ;)

2. to figure out the value of the cap when the plate is loaded with a CCS, do I use
C = 1/(2 * pi * Hz * R)
where R is simply the value of the biasing resistor -- essentially the plate load resistor is infinite due to the CCS?
Click to expand...

Yes, but that is not counting the load for that stage (it's impedance is effectively in parallel with the anode load, the anode load in this case being 'infinite', the effective anode load for AC is the load impedance)
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Top Bottom