TESLA_EL34 wrote:Tthe GT1 and GTL/GTO matamps also eat EL34's. so you need a really good quad!
What plate voltage is going on on the OR120's and Mat 120's?
The GT1 has 425 B+ but these amps are also reliable with really good tubes...
480VDC is typical for OR120s, but they can be higher.
Ade Emsley wrote:(
http://forum.orangeamps.com/viewtopic.php?t=7296" onclick="window.open(this.href);return false;)
The KT77 differs from an EL34 and 6CA7 in that it can handle much higher screen voltages making it great in amps like old OR 120`s and JTM 45/100`s
with both plate and screen in excess of 500v. EL34/6CA7`s were only designed to take 450v on the screens! because of this, the AD140 has 550v on the plates but only 380v on the screens and is well suited to the 6CA7 because of its larger plates but may well be great with KT77`s.
TESLA_EL34 wrote:On the other hand you get a really nice sound that no modern amp can or could touch,
even if the newer oranges sound really good, they don't feel the same and they aren't as super dynamic
as the old designs. but i think the newer oranges are far more reliable... you don't read much about
reliability issues with the newer oranges...
Errrr...
With good valves the old amps were actually about as near as you'll get to
bombproof reliable. Definitely up there with old Marshalls and Hiwatts!
Someone who disagrees that old Oranges / Matamps were unreliable, and can back it up with rather more evidence than I can with just my one amp, is DAVESOUNDS. He used to post here and ran / ? still runs a PA company specialising in old Oranges and Matamps. He had many thousands of hours with many of these amps with exactly zero failures in service!
http://forum.orangeamps.com/viewtopic.p ... 91#p369591" onclick="window.open(this.href);return false;
The older Oranges were simpler designs than the current ones. They were also better built. I like the modern Oranges a lot of course, but sorry, on reliability its a no contest - given good valves and routine maintainence the old ones have it every time!
http://forum.orangeamps.com/viewtopic.p ... 18#p306818" onclick="window.open(this.href);return false;
Andy.