Non-Ultra Linear PP 9 pin power tube
Posted:
Fri Feb 27, 2015 9:34 pmby gui_tarzan
I built a test mono block and was going to use a UL PP OT with EL84s, but I don't have a UL OT that's small enough to fit this chassis and I already have a pair of 9 pin output tube sockets fitted. Is there another 9 pin output tube that I can use that doesn't need a UL transformer? I have a decent selection of TV/Radio tubes to pick from and thought about using the 6AQ5 but that's a 7 pin and my socket holes are too big for those. No room on the box to put 8 pin octals either, so I'm in a bit of a quandry.
Thoughts?
Re: Non-Ultra Linear PP 9 pin power tube
Posted:
Fri Feb 27, 2015 9:47 pmby Geek
Hi,
The EL84 is a great sounding tube, even in pentode mode. I would only suggest increasing the feedback to smooth things out a bit.
There are ways of creating an electronic UL tap fron a non-UL transformer, but isn't for the feint of heart in getting it setup correctly.
Cheers!
Re: Non-Ultra Linear PP 9 pin power tube
Posted:
Fri Feb 27, 2015 9:54 pmby gui_tarzan
I don't mind a challenge, do you have more info on that?
Re: Non-Ultra Linear PP 9 pin power tube
Posted:
Fri Feb 27, 2015 11:24 pmby Geek
Yes!
I did some work with pseudo-UL here:
http://geek.scorpiorising.ca/GeeK_ZonE/ ... pic=4706.0Member T3sl4 covers some great points on the voltage divider.
Cheers!