[JMS] 250 Watt modulator for 90881

[Dennis Petrich]

Hi Cal,

I don't exactly what you have but it sounds like it has the right size to
work.  Most military transformers were under rated so I would suspect it
would handle the power OK.  Now if it can hit the impedances you need,
you'll be in like Flint....

Ciao, Dennis

-----Original Message-----
From: james_millen_society-bounces at mailman.qth.net
[mailto:james_millen_society-bounces at mailman.qth.net]On Behalf Of C E
Sent: Tuesday, July 25, 2006 8:48 PM
To: james_millen_society at mailman.qth.net
Subject: [JMS] 250 Watt modulator for 90881


All:
After reading Dennis Petrich article on making a plate
modulator for the 90881 amp, I've got the "itch" to
make one myself. I initially thought of using an
ART-13 item but some have said that it might not have
enough power handling capabilities (which I'm almost
inclined to believe might not be all that true since
it is rumored that the xfrmr has been used at the 250
watt levels). 

I have, however, stepped across a unit that contains
an 811 modulator. It is marked "Modulator Panel
PN-10-B" and with a red lable "Modulator Unit Type
5001A AM #29. It is a Signal Corps/Air Ministry unit
that came from the 1950's. The modulator transformer
is a hefty piece of iron about twice the size of an
ART-13 iron with large ceramic standoffs for the
modulator unbal out and B+ in. 

Does anyone have any idea what I have? If so, let me
know. Cal, N6KYR/8

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