This finishes off the 72 audio iron. we have two different samples here. Siemens and Tab
Coil Structure identical for both units - S - P - S - P - S
Siemens: Pri - 3,896 Turns #38 Sec 348 Turns #34 = 11:1 ratio - 3 sec winds in parallel
TAB: Pri - 4,020 Turns #38 Sec - 992 Turns #34 = 4:1 ratio - 3 pri winds in series
Siemens has Pri winds split as 1948 and 1948 Turns each
TAB has Pri winds split as inner Pri 2,180 Turns - outer Pri 1,840 Turns for D.C.R. balance.
Laminations: EI48 (mm) , 45 ea. Lace 1 x 1, Square Stack
Perm: Siemens - 22 Henries/1,000 T = 7,350 TAB: 12 Henries/1,000 T = 4,000
No reverse winding, no foldback winding, no bi-fi winding,
TAB is on a plastic bobbin, Siemens is the old school Permali board.
Siemens has the higher perm core to make up for the almost 1/3 drop in Sec turns,
a 1/3 drop means a 1/9 drop in output inductance, as it stands, the Siemens has 2 H. vs 12 for TAB.
i figure since the Siemens had the flipped input transformer, that with the reduced output ratio,
it could have been inside a console as a buss amp, where as the TAB was used as outboard .
ok, some pics>
here are the Siemens Sec winds wired together>
howabout label?
here are the shields joining the fish, which is always brn, start-blk, fin-brn, life is simple, eh?
no DC on the hi perm core>
those brass inserts sit inside the core holes, allowing no pressure from the core clamps,
this high octane alloy moves around a lot when it gets hits hard,
the lesser perm TAB had no brass inserts.
stainless for non magnetic retrospective interefeance>
here is the TAB version>
lams have a different look>
parts is parts>
ok, i have been slaving over hot transformers all day and night, time to eat breakfast and crash> ;D
you have to eat the best wurst when you dissect telefunken..
and eat off retro Sambo's china from evilbay... ;D
Coil Structure identical for both units - S - P - S - P - S
Siemens: Pri - 3,896 Turns #38 Sec 348 Turns #34 = 11:1 ratio - 3 sec winds in parallel
TAB: Pri - 4,020 Turns #38 Sec - 992 Turns #34 = 4:1 ratio - 3 pri winds in series
Siemens has Pri winds split as 1948 and 1948 Turns each
TAB has Pri winds split as inner Pri 2,180 Turns - outer Pri 1,840 Turns for D.C.R. balance.
Laminations: EI48 (mm) , 45 ea. Lace 1 x 1, Square Stack
Perm: Siemens - 22 Henries/1,000 T = 7,350 TAB: 12 Henries/1,000 T = 4,000
No reverse winding, no foldback winding, no bi-fi winding,
TAB is on a plastic bobbin, Siemens is the old school Permali board.
Siemens has the higher perm core to make up for the almost 1/3 drop in Sec turns,
a 1/3 drop means a 1/9 drop in output inductance, as it stands, the Siemens has 2 H. vs 12 for TAB.
i figure since the Siemens had the flipped input transformer, that with the reduced output ratio,
it could have been inside a console as a buss amp, where as the TAB was used as outboard .
ok, some pics>
here are the Siemens Sec winds wired together>
howabout label?
here are the shields joining the fish, which is always brn, start-blk, fin-brn, life is simple, eh?
no DC on the hi perm core>
those brass inserts sit inside the core holes, allowing no pressure from the core clamps,
this high octane alloy moves around a lot when it gets hits hard,
the lesser perm TAB had no brass inserts.
stainless for non magnetic retrospective interefeance>
here is the TAB version>
lams have a different look>
parts is parts>
ok, i have been slaving over hot transformers all day and night, time to eat breakfast and crash> ;D
you have to eat the best wurst when you dissect telefunken..
and eat off retro Sambo's china from evilbay...
;D
