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In Reply to: RE: EL156 in 6550/KT88 gear? posted by Nunki on January 20, 2015 at 04:05:33
It is a thing. EL156 is a great tube. I would want to adjust/check the bias if I did swap them in to a KT88 circuit as they do bias quite differently. They also pull 300mA more heater current; make sure you have the 1.2 amps to spare. They are different tubes and optimally will want a different load than the KT88 for a given current/voltage combination. Other than that...
Edits: 01/20/15Follow Ups:
thank you!i think heater current is no problem at all. the ATLAS Magnum can handle KT120 also. i feel uncertain about the bias for the EL156. rogue recommends only 35 mA for each KT-type (88...120!) and the amp sounds best with that moderate bias. so i would try also 35 mA with EL156 first and then perhaps rise up to 40 or 45 mA and listen what happens...
N.
The times, they are changing...
Edits: 01/21/15
It is fun to use different tubes.
You may or may not have enough of an adjustment range to get the current up without a slight modification of the bias pot ground resistor (if it has one). Careful!
hmm... i feel that the EL156 can not be sooo different from the KT88. i found this statement:
..."The chance is smiling to the dumb one from the unexpected corner: I just received as a gift a pair of Telefunken EL156 pentodes. Almost fifty years ago, Telefunken introduced the EL156 as a replacement for KT88. It was used in LP mastering labs to drive cutting lathes. At the time, the tube had a ten-pin base socket,Y10-A , and wasn’t used outside recording studios. As the LP faded, so did the EL156..."
bisassing the EL156 should be very moderate between 25-30 mA as i understand. no problem in my gear.
i just will give them a try...
N.
The times, they are changing...
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