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Impedance of bass volume control on 79 4001?
Posted: Tue Oct 31, 2017 10:25 pm
by rictified
How are you all doing? My 1979 4001's bass volume control is getting staticky when turned near max and intermittent on full. What is the impedance of this volume control, 330K or 500K? I've seen both figures and want to get the correct one, it sounds great with the impedance that's in there now so don't want to change it. Does Rick still sell this part, if not does anyone know the manufacturer? Did Rickenbacker stop selling parts or am I that computer illiterate?
Re: Impedance of bass volume control on 79 4001?
Posted: Tue Oct 31, 2017 10:32 pm
by marcinkus
Volume pots were 250k
Re: Impedance of bass volume control on 79 4001?
Posted: Tue Oct 31, 2017 10:34 pm
by rictified
marcinkus wrote:Volume pots were 250k
Thank you, I was close!
Re: Impedance of bass volume control on 79 4001?
Posted: Tue Oct 31, 2017 10:47 pm
by jps
rictified wrote:How are you all doing? ...What is the impedance of this volume control...
That would be resistance.
Re: Impedance of bass volume control on 79 4001?
Posted: Tue Oct 31, 2017 10:51 pm
by rictified
jps wrote:rictified wrote:How are you all doing? ...What is the impedance of this volume control...
That would be resistance.
Close again
I'm going to quit before I completely discredit myself.
Re: Impedance of bass volume control on 79 4001?
Posted: Wed Nov 01, 2017 12:37 am
by jps
No worries, Bob.
I'm sure you've seen some of the gems on Talkbass. Like ohmage, for one example.
Re: Impedance of bass volume control on 79 4001?
Posted: Wed Nov 01, 2017 10:40 am
by aceonbass
The pots originally used were 250K CTS dish backed pots with a 250K rating. They also had a 1/4" tall bushing, and are sold shaft. These exact pots are difficult to source, but I stock them. PM me if you're interested.
Re: Impedance of bass volume control on 79 4001?
Posted: Wed Nov 01, 2017 1:48 pm
by Isaac
jps wrote:rictified wrote:How are you all doing? ...What is the impedance of this volume control...
That would be resistance.
Impedance is also correct. It's just that there is no reactive component to it!
Re: Impedance of bass volume control on 79 4001?
Posted: Wed Nov 01, 2017 4:01 pm
by rictified
aceonbass wrote:The pots originally used were 250K CTS dish backed pots with a 250K rating. They also had a 1/4" tall bushing, and are sold shaft. These exact pots are difficult to source, but I stock them. PM me if you're interested.
Thanks Dane I wish I had known, I already ordered some from Rickysounds out of England, supposed to be like the originals, I guess we'll see.
Re: Impedance of bass volume control on 79 4001?
Posted: Wed Nov 01, 2017 4:12 pm
by rictified
Isaac wrote:jps wrote:rictified wrote:How are you all doing? ...What is the impedance of this volume control...
That would be resistance.
Impedance is also correct. It's just that there is no reactive component to it!
I thought that was the definition from my long ago electronics past.
Re: Impedance of bass volume control on 79 4001?
Posted: Thu Nov 02, 2017 7:54 pm
by Isaac
rictified wrote:I thought that was the definition from my long ago electronics past.
It is. There's resistance (resistors), reactance (capacitors and inductors), and impedance, the vector sum of resistance and reactance. So, if the reactance is zero, then the impedance is equal to the resistance. Similarly, if there is no resistance (theoretically possible, but not in practice) then the impedance is equal to the reactance. But seriously, I agree with you. Impedance isn't technically incorrect, but resistance is more direct, more accurate, and less likely to confuse anyone.