845 amps
845 amps are large because the sockets take so much room.
They are not necessarily expensive ; and you can run them at
500V and achieve good results at no more cost than a 300B amp.
The low voltage variants sound very nice... My amp was well received about 4 years ago at some DIY gatherings, I know of at least 5 people who replicated my implementation because it sounded THAT good. Some people even got the amp done under $500 in parts ; but they already had some key parts on hand or made some concessions.
They are quite beautiful too, it's a huge glass tube, and it throws
warm light like a nightlamp. So, there is an aesthetic factor to choosing it over the 300B.
If you're looking at the 1000V+ designs you'll see 10Kohm output
transformers. You can get away with a 6K load very nicely, and
even a 5K load. The door is open for all kinds of great transformers
for 845: Edcor 5K/6K SE, The new Hammond 1628SEA/1629SEA,
the One Electrons, and more. 845's at low voltage also
are wonderful candidates for the Ultrapath topology. You'll
want a driver than can do 160V, which means you can copy a
driver from pretty much any good 300B amp.
-- Jim
845 amps are large because the sockets take so much room.
They are not necessarily expensive ; and you can run them at
500V and achieve good results at no more cost than a 300B amp.
The low voltage variants sound very nice... My amp was well received about 4 years ago at some DIY gatherings, I know of at least 5 people who replicated my implementation because it sounded THAT good. Some people even got the amp done under $500 in parts ; but they already had some key parts on hand or made some concessions.
They are quite beautiful too, it's a huge glass tube, and it throws
warm light like a nightlamp. So, there is an aesthetic factor to choosing it over the 300B.
If you're looking at the 1000V+ designs you'll see 10Kohm output
transformers. You can get away with a 6K load very nicely, and
even a 5K load. The door is open for all kinds of great transformers
for 845: Edcor 5K/6K SE, The new Hammond 1628SEA/1629SEA,
the One Electrons, and more. 845's at low voltage also
are wonderful candidates for the Ultrapath topology. You'll
want a driver than can do 160V, which means you can copy a
driver from pretty much any good 300B amp.
-- Jim
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