J
John Robertson
Guest
I figure this could work for upgrading old jukebox amplifiers, type AB
or B class, from the mid 70s that ran on Germanium transistors - almost
unobtanium these days. And never that reliable to begin with.
Is it possible to use MosFets to replace them? There is a bit of info on
line about replacing G with S, but I don't think I've seen anyone talk
about Mos...
The original amp runs on -46VDC to ground and is roughly 25W RMS into a
16R load - has an output transformer for 70V operation as well as taps
for various speaker volumes. I suspect I'd have to replace the entire
power amp side as mixing G with Mos is probably just not going to work.
Suggestions welcome!
Thanks!
John :-#)#
--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd.
MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
(604)872-5757 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."
or B class, from the mid 70s that ran on Germanium transistors - almost
unobtanium these days. And never that reliable to begin with.
Is it possible to use MosFets to replace them? There is a bit of info on
line about replacing G with S, but I don't think I've seen anyone talk
about Mos...
The original amp runs on -46VDC to ground and is roughly 25W RMS into a
16R load - has an output transformer for 70V operation as well as taps
for various speaker volumes. I suspect I'd have to replace the entire
power amp side as mixing G with Mos is probably just not going to work.
Suggestions welcome!
Thanks!
John :-#)#
--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd.
MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
(604)872-5757 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."