I've got a pair of 10K OPTs with 4 and 8 ohm secondaries. I also have a pair of 6l6GCs, with a mess of preamp tubes around. My question is, how can I put these OPTs to use? I think maybe I can run the 6l6s in triode w/ like 350 B+ and get a few watts while staying under their 30w dissapation. Data sheet says in pentode mode I should expect 10-15% distortion with a 4k load. That seems like alot. Will a greater load increase or decrease distortion. Maybe some NFB, but how much? Good idea?
It seems like most designs call for a 5k load or less. Is their some other tube that is happy driving a 10k load? I think maybe I should just build it and find out... What do y'all think?
Wow, this post has an abundance of question marks dosen't it...
-Jared
It seems like most designs call for a 5k load or less. Is their some other tube that is happy driving a 10k load? I think maybe I should just build it and find out... What do y'all think?
Wow, this post has an abundance of question marks dosen't it...
-Jared
One 12AU7 with both sections in parallel?
Problem is you'll need a really, really high voltage to get any power output. No matter what you do.
Tim
Problem is you'll need a really, really high voltage to get any power output. No matter what you do.
Tim
10K to 4 and 8 ohms - ok, that is 50 and 35 to 1 turns ratio, which could be translated as 5K to 4 and 2 ohms, but you need to know how many watts they can handle - how big are they?
Consider taking a page out of the DECWARE SE84's book. Triode strapping the 6L6s with 100 Ohm resistors will be FINE. You will end up with about 5 BALLSY W. Distortion will be LOW and the damping factor will be HIGH for a SET amp.
A pair of true mid 90s efficient 4 Ohm speakers connected to the 8 Ohm taps might give you a pleasant surprise. 2 Ohm Parker 95s/98s connected to the 4 Ohm taps could be excellent.
A pair of true mid 90s efficient 4 Ohm speakers connected to the 8 Ohm taps might give you a pleasant surprise. 2 Ohm Parker 95s/98s connected to the 4 Ohm taps could be excellent.
How big are the OPTs?
10K is often used with EL84, EL95, ECL82, ECL86, ECC80.
It would have to be a substantial OPT for 845s.
dave
10K is often used with EL84, EL95, ECL82, ECL86, ECC80.
It would have to be a substantial OPT for 845s.
dave
You need to establish how much standing current (DC) they can take.
IMO pentodes need fedback to sound reasonable. Triodes are best without.
IMO pentodes need fedback to sound reasonable. Triodes are best without.
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