I saw a chinese guy run 600VDC on 3.5K OPT and use 6v6 280vdc anode to drive .
But wattage is more than 15W which seem better but don't know schematic.
But wattage is more than 15W which seem better but don't know schematic.
How do you get to 15W? Let's make some assumptions:
Plate/G2 at 280V
Cathode current 30mA
Cathode voltage 25V
Total dissipation: (280-25)*0.03 = 7.65W
I'm assuming that the 811A grid current at idle is 30mA or less.
If 811a can run max 15watts seem sad to me. Otherwise kt88 120 150 SE can get more than 15Watts
I have 45SE 2 watts and I want something SE pass 15 watts more more. But I don't like 6C33 211 845
I have 45SE 2 watts and I want something SE pass 15 watts more more. But I don't like 6C33 211 845
Thank you mr jcalvarez, now I have a clue of calculating wattage. I also have 2 of 6080WB as 5998 in above schematic. but after I read many thing about JJ 6V6, i think it is neutral enough to my taste with good bass. EL34 seem a little midrange forward. For SE may be a little dark tone like 6v6 or 6L6 might match.
Question is it possible to replace 6080wB to 6v6 in 24 watts schematic?
Thx so much
Question is it possible to replace 6080wB to 6v6 in 24 watts schematic?
Thx so much
Attachments
A 6080 is very different from a 6V6. You will definitely have to change at least some resistor values to do that.
About that schematic, I do not see the ground return from the power supply, it feels like it is hanging in the air.
About that schematic, I do not see the ground return from the power supply, it feels like it is hanging in the air.
Then schematic is not correct.
Can you help me calculate 811a wattage under condition of using EL34 to drive at 30VDC 28ma and Va of 811 is 385VDC 104ma? Thank you in advance.
Sorry for bothering you calculate again
Can you help me calculate 811a wattage under condition of using EL34 to drive at 30VDC 28ma and Va of 811 is 385VDC 104ma? Thank you in advance.
Sorry for bothering you calculate again
The point is if SE watttage pass 16 watts or more. 24w is good, then it will be fun with my 85db SB brommo speakers with variety of music.
I want sound like 45SE which I drive with 91db Seas P25REX.
811a is the most resemble to 45. Otherwise 12-15W I will buy KT88 SE instead. No need to DIY 811a
I want sound like 45SE which I drive with 91db Seas P25REX.
811a is the most resemble to 45. Otherwise 12-15W I will buy KT88 SE instead. No need to DIY 811a
OK, so what you need is not 811A dissipation, what you need is the output power. I will do some simulations.
You are not going to get that with an 811A. The 45 is very linear. The 811A is not.
I tried different output transformer options (3.3K and 5K), playing with supply voltage, best I could get was 15W, with 2.5% THD, and a very ugly distortion profile.
I'd say keep away from the 811A. You will get better results with a triode-strapped KT88.
In general getting 24W from an SE setup is not that simple, and, taking into account that your reference is a low power tube (45), then I'm not sure why you need 24W.
I'd say keep away from the 811A. You will get better results with a triode-strapped KT88.
In general getting 24W from an SE setup is not that simple, and, taking into account that your reference is a low power tube (45), then I'm not sure why you need 24W.
Oh, why shop which make 811a kt88 45 300B 4p1l fu50 recommend me to go with 811a??
In youtube, it sound very nice. I think there might be something incorrect
In youtube, it sound very nice. I think there might be something incorrect