try here..
Hi,
I'm not expert in tubes, but i still learning for guitar amp i found here :
www.westlabs.com the are a vintage schem, but it's for guitar, the distortion in guitar amps usually big, i don't know this will help you, it using a fixed bias i think.
regards,
opik
Hi,
I'm not expert in tubes, but i still learning for guitar amp i found here :
www.westlabs.com the are a vintage schem, but it's for guitar, the distortion in guitar amps usually big, i don't know this will help you, it using a fixed bias i think.
regards,
opik
calico88 said:
If you are looking for a high power, single ended amp based on 6550 in triode mode you will have to use many tubes in parallel. Each tube will just give you about 8W (depends on operation point).
If you are looking for triode power, 811A in push pull or another high voltage triode is one path to follow, but there you will find other challenges like high voltage, linearity (due to class B operation), driver requirements, etc. But this could easily give you 150W+.
On the safer side, a PP design based on Williamson or Mullard 5-20 with 4x triode strapped EL34 is capable of ~35W.
Jan E Veiset
Hey-Hey!!!,
If you need triodes for the sound quality, and recognize the need for class A to complement that you should consider the effects of paralleling the power tubes. They're 3x as hard to drive, they won't be exactly matched and thus won't play together as well as a single would.
Get a power tube with plate dissipation that can do it with a single pair. Use real triodes. 845 for example. 35W is easy with a bit more than 800V of B+ and a 10k a-a output TX.
If it is worth doing, it's worth doing right.
cheers,
Douglas
If you need triodes for the sound quality, and recognize the need for class A to complement that you should consider the effects of paralleling the power tubes. They're 3x as hard to drive, they won't be exactly matched and thus won't play together as well as a single would.
Get a power tube with plate dissipation that can do it with a single pair. Use real triodes. 845 for example. 35W is easy with a bit more than 800V of B+ and a 10k a-a output TX.
If it is worth doing, it's worth doing right.
cheers,
Douglas
more than 35W!
I'm building this right now..
over 50W in SE triode with only 2 tubes.
input / driver 6EM7 output RS607.
And a huge power supply,,,
I'm building this right now..
over 50W in SE triode with only 2 tubes.
input / driver 6EM7 output RS607.
And a huge power supply,,,
more than 35W!
and here's the power supply...
the 16.5V 15 amps for the filament was a bit of a problem.
and here's the power supply...
the 16.5V 15 amps for the filament was a bit of a problem.
ray_moth said:
True, but even in class A, I've always found a well designed driver stage is the cue for excellent performance. Bear in mind the 6550 grid leak value for fixed bias is quoted far lower than for other power tubes. This can make hard work for drivers that run into distortion before o/p stage does.
richy
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