On Tue, 15 Jul 2014 18:58:23 -0600, maxhifi wrote:
Patrick Turner wrote:
John Stewart proposes a low cost SE amp using 6LU8.
http://www.audiobanter.com/attachmen...tachmentid=379
It is many years since that tube has been made. Maybe not everyone
could obtain one. Pentode Pda rating = 14Watts, so say 12W max in
practice for SE class A1. This means max Po = 5 Watts with low OPT
losses, at 42% anode efficiency.
snip
The 6LU8 is all but unobtainable here in the UK. It often costs far more
for the postage than it does for the valve - and we always get hammered
on postage from the US. (The postage is far cheaper from China). 1/2
ECC88 / 6L6 seems to work quite nicely but has a bit less gain than
ECC83/12AX7 for the first stage. The Hammond 125SE OPT also seems to be
quite reasonable for the money - especially when you look at how much it
costs for "proper" iron over here. They are probably on a par with
similarly specified Edcor.