NewYorkDave
Well-known member
I've been using the following line output with good results in recent experiments. Perhaps it can be adapted to your own designs.
If you can tolerate a higher insertion loss--on the order of 12 to 14 dB--try using the entire primary of the transformer. This will provide a lighter load for the 12BH7 to drive, and will likely result in improved performance and slightly higher maximum output.
The Edcor is rated for +27dBM maximum, but I'll bet it could handle peaks of +30dBM without peril. It's a pretty hefty little transformer.
The figures quoted on the drawing assume a 600 ohm load. Maximum output will doubtless be higher into a higher impedance load, but the transformer might ring. Try it and see.
If you can tolerate a higher insertion loss--on the order of 12 to 14 dB--try using the entire primary of the transformer. This will provide a lighter load for the 12BH7 to drive, and will likely result in improved performance and slightly higher maximum output.
The Edcor is rated for +27dBM maximum, but I'll bet it could handle peaks of +30dBM without peril. It's a pretty hefty little transformer.
The figures quoted on the drawing assume a 600 ohm load. Maximum output will doubtless be higher into a higher impedance load, but the transformer might ring. Try it and see.