On Tue, 10 Feb 2009 22:47:06 -0500, Michael Black wrote:

On Wed, 11 Feb 2009, Paul P wrote:


wrote in message
news:722c01b0-
...
On Feb 9, 9:14 pm, " wrote:
Looking to buy a 3395 AM filter as used in early tube Heathkit
receivers..any other suggestions on receiving AM with homebuilt filter
system? TNX 73 Harold Followup: I am looking for a 3395
KHZ. AM Filter for a Heathkit SB301 .The AM filter was offered as an
Option . The SB 301 will not receive AM without the optional
filter....It has AM detector and everything but the filter..I thought
someone might have worked out a substitute for the Heath filter..like
a high Q tuned IF can or whatever... TNX Harold

I worked on a National NC-300 a few months ago. It had a conversion
from a coil to a crystal at the second converter stage. About half way
down the page: http://www.ppinyot.com/N/national/national.htm look for
the "Second Converter modification at V3 6BE6" paragraph. Schematics
and FNBs are on BAMA.

The crystal used in the NC-300 is not at your frequency. But a crystal
company should be able to make you one. I purchased Hammarlund
specific crystals from http://www.icmfg.com/ The crystals were about
25 bucks each.

AND the woman that answered the phone is not just a receptionist. She
knew exactly which crystals I needed for the Hammarlund and what
overtone and impedance!!! Not that she is a woman but she knew exactly
what the vintage crystal replacement I needed!

Who knows, but likely they have it on computer.

The old crystal manufacturers tended to keep such information around,
and certainly once they had the information because someone had sent it
to them to get a needed crystal ground, they'd surely have kept it. So
after a while, they could just look up the information. If they
bothered to computerize it, then all they'd have to do is type in some
search terms, and out would pop the needed information. That wouldn't
require someone who knew all the details by heart.

Michael VE2BVW

But, in such a situation having someone willing and able to properly
fondle the keyboard, then cheerfully tell you what you need to know, is
still better than a snide gum-chewing receptionist!

I try not to undervalue order-takers and such. Given how much value they
can add when they're on the ball (and how much they can screw up when
they're not), one cannot dismiss them as "just" anything.

--
http://www.wescottdesign.com