6S19P Amplifier
Posted: Wed Jan 31, 2007 9:24 pm
Here we go, official thread. These tubes caught my eye. At barely more than $3 per, they're certainly a bit easier of an entrance into decently powerful triodes without going down the route of the 2A3/300B etc.
(two of mine)
Nothing definite so far, you can take a look at this tube's specs in the "tube 101" section.
so far I only have the tubes, 10 of the 6S19P, and two maybe-dead 6N1P's that I might try as the input/splitter stage.
B+ will probably be around 320V, with 220V on the plates and 50mA of current per. I haven't figured out exactly how to end up with this voltage and ~240mA of current, but I do have a 193M (10H, 300mA) and a pair of 6AY3B damper diode tubes, good for 175mA per BUT it doesn't say anything about a choke input filter, I suspect they'll be just fine.
The OPT primary impedance will probably be 2.5K (or 5K, I'm still confused). Power probably won't need to be more than 15 or so watts.
The driver stage is, to quote myself:
a single 12AT7 per channel to drive the 6S19P's. grounded-cathode at 300V (filtered down from 320V) into a 1/2W 33K plate load, with an unbypassed 100-ohm cathode resistor. 3mA plate current, and a voltage swing of -85 to +86.1. If I drop the cathode resistor to 90 ohms, I get -86/+86.1V. Unfortunately, the output impedance is pretty high at 12.1k...
Before that might be a 6N1P (probably not, because they're voltage hogs) or 6DJ8/6N23P doing input and phase splitting duty.
How does this sound so far?
(two of mine)
Nothing definite so far, you can take a look at this tube's specs in the "tube 101" section.
so far I only have the tubes, 10 of the 6S19P, and two maybe-dead 6N1P's that I might try as the input/splitter stage.
B+ will probably be around 320V, with 220V on the plates and 50mA of current per. I haven't figured out exactly how to end up with this voltage and ~240mA of current, but I do have a 193M (10H, 300mA) and a pair of 6AY3B damper diode tubes, good for 175mA per BUT it doesn't say anything about a choke input filter, I suspect they'll be just fine.
The OPT primary impedance will probably be 2.5K (or 5K, I'm still confused). Power probably won't need to be more than 15 or so watts.
The driver stage is, to quote myself:
a single 12AT7 per channel to drive the 6S19P's. grounded-cathode at 300V (filtered down from 320V) into a 1/2W 33K plate load, with an unbypassed 100-ohm cathode resistor. 3mA plate current, and a voltage swing of -85 to +86.1. If I drop the cathode resistor to 90 ohms, I get -86/+86.1V. Unfortunately, the output impedance is pretty high at 12.1k...
Before that might be a 6N1P (probably not, because they're voltage hogs) or 6DJ8/6N23P doing input and phase splitting duty.
How does this sound so far?