Carbon resistors arenever a good choice, except for restoration of old equipment with historic value.
Regards, Gerrit
Regards, Gerrit
I would use metal film where possible. Fewer bad surprises. At 1 cents each either way the cost of bad surprises exceeds the component cost, even if the cost is only measured in frustration and wasted effort.
Regards, Gerrit
Regards, Gerrit
Try both. You'll spend more on your time than you'll spend in resistors.
Reading thru Building High Fidelity Valve Preamps will give you the idea that Hi-Fi projects should use Metal Film, while guitar projects should use Carbon Film.
Posts on this forum could give you the idea that Grid Leaks and Grid Stoppers should be CF, while Plate Loads should be Carbon Comp, and resistors in the power supply should be Metal Oxide.
All that's to say, you can find an argument for any resistor in any position. Only your ears know what sounds right to you.
Reading thru Building High Fidelity Valve Preamps will give you the idea that Hi-Fi projects should use Metal Film, while guitar projects should use Carbon Film.
Posts on this forum could give you the idea that Grid Leaks and Grid Stoppers should be CF, while Plate Loads should be Carbon Comp, and resistors in the power supply should be Metal Oxide.
All that's to say, you can find an argument for any resistor in any position. Only your ears know what sounds right to you.
Plate load resistors can be any resistor you want. Are some better in a plate load than others? Yes. Carbon film and metal film are nearly the same price nowadays, so most people use metal film. A good brand/series is Vishay PR0 series.
Carbon composition resistors are noisier than film resistors, but your circuit has to be quiet enough to hear the noise contribution of the resistor. Most amp circuits will work well with carbon comp.
Check out Digikey and Mouser for the PR0 series.
Carbon composition resistors are noisier than film resistors, but your circuit has to be quiet enough to hear the noise contribution of the resistor. Most amp circuits will work well with carbon comp.
Check out Digikey and Mouser for the PR0 series.
What about cathode resistor? What type then?Try both. You'll spend more on your time than you'll spend in resistors.
Reading thru Building High Fidelity Valve Preamps will give you the idea that Hi-Fi projects should use Metal Film, while guitar projects should use Carbon Film.
Posts on this forum could give you the idea that Grid Leaks and Grid Stoppers should be CF, while Plate Loads should be Carbon Comp, and resistors in the power supply should be Metal Oxide.
All that's to say, you can find an argument for any resistor in any position. Only your ears know what sounds right to you.
Carbon film and metal film are both fine for anything.
How So? Back in the distance past when I still had hair & teeth we built most circuits with them.Carbon resistors arenever a good choice,
And damn good low noise preamps for reluctance phono pickups, just mVolts to work with.
Where have "U' been ?? 😀 😀
Wirewound resistors for power tubes, Non-Inductive if you can get them. MF or CF are fine for low-voltage K resistors, Wirewounds for cathode followers.What about cathode resistor? What type then?
okay, carbon comp is the best choice for plate load and non inductive wirewound for cathode bias. I meant for 6922 tube in a preamp gain stage
What about wirewound for plate load as well?
What about wirewound for plate load as well?
No need. Power tube cathode resistors work hard, everything else can be 1/2w. High gain guitar amps may benefit from 1w plate load resistors, but 1w carbon comps are getting hard to find.
e cathode resistor is a perfect place to use ohm's law to determine the current thru the tube, and the K resistor.
e cathode resistor is a perfect place to use ohm's law to determine the current thru the tube, and the K resistor.
A K-resistor is a fuse that doesn’t need to open 300+ volts. Carbon films burn open quite nicely, and keep damage contained well - at least on PTP wiring.
Carbon comp is the worst except for restoring vintage guitar amps
Your first post was asking about carbon film. Now you've changed to carbon comp. Not the same and in the case of carbon comp noise and value drift over time are issues.okay, carbon comp is the best choice
Carbon comp/ film resistors dont like dissapating much heat.they get noisey and dift off value.use them were you like but overate them by a lot.
Remember, a Hi-Fi amp's job is to faithfully reproduce a recorded audio signal. A guitar amp's job is to take a guitar signal and make it more. Carbon Comp resistors add something to the sauce in a Guitar amp. MF and CF resistors will behave better in a Hi-Fi amp, or preamp.okay, carbon comp is the best choice for plate load and non inductive wirewound for cathode bias.
Tell the curious among us Why? 🙂 🙂Carbon comp is the worst except for restoring vintage guitar amps
- Home
- Amplifiers
- Tubes / Valves
- Carbon Film Resistor for plate load?