🚀 go-pugleaf

This is a multi-part message in MIME format.

------=_NextPart_000_0060_01CD025A.4C20C2A0
Content-Type: text/plain;
	charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

FA: UTC HA-107 AUDIO INTERSTAGE TRANSFORMER (Fully-Tested)


http://www.ebay.com/itm/230761522533?ssPageName=3DSTRK:MESELX:IT&_trksid=3D=
p3984.m1555.l2649#ht_500wt_965


Replacing Lundahl interstage transformer with UTC HA-107 was a big =
improvement. Permalloy=20

cores are inherently more linear than silicon steel. They may be not the =
best choice for=20

output transformer due to saturation issue, but for interstage use they =
are unbeatable.
HA-107:

15+15 K primaries=20
45+45 K secondaries=20
20-20,000 Hz 3 dB=20
Pmax 200 mW=20
No unbalanced DC=20
Weight about 4 lb

The core in these transformers is supermalloy (or hypermalloy, as UTC =
called it). It is 80%=20

Ni alloy annealed in hydrogen atmosphere to achieve the highest mu =
(about 20,000 compared to=20

10,000 of 45% Ni permalloy and 5,000 of silicon steel). High =
permeability allows achieving=20

the same inductance with fewer turns, thus decreasing stray inductance =
and winding=20

capacitance. HA-107 has two layers of shielding, external mu metal and =
internal copper.=20

Separate windings allow independent biasing of output tubes.=20

-


------=_NextPart_000_0060_01CD025A.4C20C2A0
Content-Type: text/html;
	charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.18702">
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT size=3D2 face=3DArial>FA: UTC HA-107 AUDIO INTERSTAGE =
TRANSFORMER=20
(Fully-Tested)</FONT></DIV>
<DIV>&nbsp;</DIV><FONT size=3D2 face=3DArial>
<DIV><BR><A=20
href=3D"http://www.ebay.com/itm/230761522533?ssPageName=3DSTRK:MESELX:IT&=
amp;_trksid=3Dp3984.m1555.l2649#ht_500wt_965">http://www.ebay.com/itm/230=
761522533?ssPageName=3DSTRK:MESELX:IT&amp;_trksid=3Dp3984.m1555.l2649#ht_=
500wt_965</A></DIV>
<DIV>&nbsp;</DIV>
<DIV><BR>Replacing Lundahl interstage transformer with UTC HA-107 was a =
big=20
improvement. Permalloy </DIV>
<DIV>&nbsp;</DIV>
<DIV>cores are inherently more linear than silicon steel. They may be =
not the=20
best choice for </DIV>
<DIV>&nbsp;</DIV>
<DIV>output transformer due to saturation issue, but for interstage use =
they are=20
unbeatable.<BR>HA-107:</DIV>
<DIV>&nbsp;</DIV>
<DIV>15+15 K primaries <BR>45+45 K secondaries <BR>20-20,000 Hz 3 dB =
<BR>Pmax=20
200 mW <BR>No unbalanced DC <BR>Weight about 4 lb</DIV>
<DIV>&nbsp;</DIV>
<DIV>The core in these transformers is supermalloy (or hypermalloy, as =
UTC=20
called it). It is 80% </DIV>
<DIV>&nbsp;</DIV>
<DIV>Ni alloy annealed in hydrogen atmosphere to achieve the highest mu =
(about=20
20,000 compared to </DIV>
<DIV>&nbsp;</DIV>
<DIV>10,000 of 45% Ni permalloy and 5,000 of silicon steel). High =
permeability=20
allows achieving </DIV>
<DIV>&nbsp;</DIV>
<DIV>the same inductance with fewer turns, thus decreasing stray =
inductance and=20
winding </DIV>
<DIV>&nbsp;</DIV>
<DIV>capacitance. HA-107 has two layers of shielding, external mu metal =
and=20
internal copper. </DIV>
<DIV>&nbsp;</DIV>
<DIV>Separate windings allow independent biasing of output tubes. </DIV>
<DIV>&nbsp;</DIV>
<DIV>-</DIV>
<DIV>&nbsp;</DIV>
<DIV></FONT>&nbsp;</DIV></BODY></HTML>

------=_NextPart_000_0060_01CD025A.4C20C2A0--