• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

1.5K 200W output transformers? What tubes?

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Jump to Latest
G

gorgon53

Member
Joined 2006
Paid Member
deicide67 said:
Everyone keeps pointing to the EL509. It looks like a nice tube, and I can feed it 3-350V for UL, or 540V for pentode based on my transformers.

With a 35W dissipation, why would it be better than the 40-42W dissipation of the 6550 or KT88?

Will a quad of them perform better into 1.5K than a quad of KT88s?
Click to expand...

No, 4 pairs of KT88 (look at my former post where I gave the exact details) is the optimal, Sowter knew how to design transformers and this transformer is clearly designed to suit 4 pairs of KT88 in ultralinear.
If you use any other tubes make sure the Zout is aprrox. the 1,2kohm this
transformer is designed for, otherwise Q and frequencyresponse will be less than optimal.
 
Last edited:
D

deicide67

Member
Joined 2008
I finally got these and they need a wire wheeling, but they are huge!!

AAF8B8B0-7914-4E33-ACA5-117282D27964-13921-00000BA6B1745E93.jpg


That's a hammond 193Q next to it. I'm going to salvage this chassis I started a while back with a steel plate. I am going to add one more pair of output tubes and go fixed bias With three pairs of KT88s.

Blair
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Top Bottom