Yeah, that's correct.
If you compare them then you would see that I have copyed part's of it.
I think that the Ameritron amp. is running the tubes a bit to hard.
An other thing i have done is that i have added an adjustabile bias and
not an string of diodes like ameritron has done.
73 de Thomas
tir, 26,.09.2006 kl. 17.09 -0400, skrev KR4DA:
toggle quoted message
Show quoted text
Very good English
Anyway I had a Ameratron (sp) AL 811H
This was a 4 tube 811 amp.
Try researching it for CKT diagrams and ideas.
I think the schematic is on the Ameratron web page.
la3pna wrote:
Hi group.
I'm Thomas, La3PNA and I'm in the progress of starting to build an
HF
amplifier with 4 811A tubes. I'm gone to use 4 of them because, I
got
the tubes, sockets and Plate caps for 4. I have drawn an shematic
that
can be found in the folder "LA3PNA 811 amplifier" in the Files
section.
I have drawn it as an one band unit, mostly since the rotary
switches
in Eagle are stupid drawn, I would like to make it work at all nine
HF bands, from 160M to 10M.
I wrote an e-mail to R L MEASURES and got an nice answer on some of
my
questions. He recomended to use 5 of 811, but i think that it is a
bit
hard to get 5 matched tubes?
I have found out that one 811 tube has an impedance of 300 ohm's so
4
of them should give an inpedance of 75 ohms. Is this correct? found
the data in an old ARRL handbook, on an article on an one tube amp.
Hope that some of you have time to take an look at my design and
please let me know if there is any errors.
73 de Thomas LA3PNA
PS: sorry for my bad English.
--
de KR4DA Bob Middleburg, FL
HK0/KR4DA J79DA FG/KR4DA
--
Best Regards/MVH
Thomas S Knutsen
LA3PNA
