I maintained a Wilkinson AM1000 at WKEX in Blacksburg, VA, about 30 years ago.
It stuggled to make 1 kW, and we ran it with a window fan blowing into the open
back door, to prevent it from burning out the screen voltage rheostat (power
control knob). Eventually I added some fixed R and the part
Hi Craig, I have been meaning to send you an email for a while. Hope all
is better there. How are the SP-600's going? I now have that RCA 77D
Mike complete and back from Clarance Kane who has rebuilt and tested it.
Are you still looking for one?
Hope to see you at Howard's again soon.
Best
Hello Peter!!
Well, the SP-600s are nearing completion. The original family crisis is
over with a good resolution, but my wife's 87 year old mother broke her
leg a few weeks ago, and we've been attending to her 24-hour a day
needs. She's recovering nicely, if very slowly, however.
I hope
Obviously, my last message was directed toward Peter privately -- but
hey!, we're one big happy family here!
73,
Craig
W3CRR
I'm glad you Peter shared, Craig. It gave me the opportunity again
to drool over the thought of a '77D mic, which is all I'll be able to
afford to do for a while yet.
~ Todd KA1KAQ
On 5/23/06, Craig Roberts [EMAIL PROTECTED] wrote:
Obviously, my last message was directed toward Peter
Strange indeed Bill!
I don't mean to be descending but have you checked to see if you
wearing your wife's glasses instead of yours. HIHI
It is possible to drive the screens instead of the control grids as
a class B zeros bias circuit however it would require neutralizing to work
Polycomm 62 sold; stil have an Eldico AT-1, Antennascope.
Pete
On Tue, 16 May 2006 18:27:12 -0500 [EMAIL PROTECTED] writes:
Hello Pete: Wish I could go (sob).
If you dont sell the Polycom, lets talk.
What did you have in Eldico ??
73 DE Charlie, K0NG ..
On 5/23/06, Peter Markavage [EMAIL PROTECTED] wrote:
Polycomm 62 sold; stil have an Eldico AT-1, Antennascope.
I have one of those Pete, minus the top decal. Interesting
conversation piece. Also have a set of the last Eldico 'clones'
labeled as RELiant instead of Eldico. From all I've seen,
It sounds like they were connecting the 813s as zero-bias triodes, more
often done in modulator service. Don't know why they'd do this instead of
run them GG in this application, though, unless there was an appreciable
difference in gain. Maybe the guy just wanted to experiment with something
I'd like to stir up some activity on 14.286 AM. There used to be quite an
active group up there with W6HQI(SK), W8VYZ, WA4KCY, W6HDU, and others. I'd
join them from time-to-time back in the latter 80's and early 90's.
I talked to W8VYZ last weekend on 40M, and he said he still gets up there,
The signal generator has been sold. Many thanks to all who replied.
73,
Craig
W2CRR
To all owners or those familiar with the BTA-1R series of transmitters:
The Power Raise/Lower variable resistor (1R405) is connected to the
motor unit which turns it when switch #1S202 is operated. The
connection between the motor and the rheostat on mine is gone and I
can't seem to find a
Check with davidsarnoff.com they have all the docs for that unit
Brad KB7FQR
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Rick Brashear
Sent: Tuesday, May 23, 2006 11:30 AM
To: AMRadio@mailman.qth.net
Subject: [AMRadio] BTA-1R2
To all owners or those
Thanks Brad, I have an email into them to see if they have the manual.
73,
Rick/K5IZ
uvcm inc. wrote:
Check with davidsarnoff.com they have all the docs for that unit
Brad KB7FQR
I talked to Bill, W8VYZ on 7290 kHz for over an hour while I was mobiling
out to Dayton. He is getting on 20M regularly, but most recently he has
been signing on at about 2230 EDT. Apparently the band has been very good
lately and an AM station from New Zealand running 200 watts has been a
Rick,
Its a typical WELL INSULATED flex shaft coupling with the required
size holes. The full 3.1 kv B+ is on the rheostat.
Larry W3LW
At 02:29 PM 5/23/2006, you wrote:
To all owners or those familiar with the BTA-1R series of transmitters:
The Power Raise/Lower variable resistor (1R405)
If you want I can take a close up photo of mine and
Email it to you.
--- Rick Brashear [EMAIL PROTECTED] wrote:
To all owners or those familiar with the BTA-1R
series of transmitters:
The Power Raise/Lower variable resistor (1R405) is
connected to the
motor unit which turns it when
Thanks. Mine has a porcelain coupling isolating the rheostat from the
motor drive shaft, but what concerns me is without some kind of slip
apparatus on the two 1 3/8 hubs that connect the rheostat shaft
coupling to the motor drive shaft coupling it would be possible to do
damage to either the
If you don't mind John I would really appreciate it. I'd hate to mess
this part up as I doubt it would be easy to replace.
Thanks,
Rick/K5IZ
John Wright wrote:
If you want I can take a close up photo of mine and
Email it to you.
--- Rick Brashear [EMAIL PROTECTED] wrote:
Thanks for the quick response to my questions concerning this amp. John, I
was ready for some salty remarks (hihi) and I did clean my glasses and take a
second or third look at the thing. I thought I had missed something since
going to USAF Radio School in the early 50's. Guess that tells u
Rick I thought you had a BTA1R1... With it just run out to Masons
and take all the pixs you want of the conversion...Very well done by
Mason and John King K5CDV... As you know John is the CE of WRR.. He has
done lots of
These conversions...
Bob W1PE
-Original Message-
From:
Hi All... There will be an AM Forum at 3PM Friday the 9th of June at
1500
At this years HAMCOM. HAMCOM is the 9th and 10th in Plano, TX. Check out
the website at www.hamcom.org for all the info. Planed right now is an
AM BBQ at Jims W5WN at 18:30 sponsored by the NOSAM Group. The New Old
Stock AM
If it ain't broke, don't fix it.
73, Ed Richards K6UUZ
Simi Valley, Ca 93065
Home of the Air Force 1 pavilion
On Tue, 23 May 2006 14:04:19 -0700 (PDT) Bill Fondren
[EMAIL PROTECTED] writes:
Thanks for the quick response to my questions concerning this amp.
John, I was ready for some salty
Thanks for the reply Peter. Always wanted to try a PolyCom. Maybe some
day ? Already have antenna scope, sorry.
Thanks again 73 DE Charlie K0NG ..
Enjoyed the news here Craig !! (HI) 73 DE K0NG ..
Bill does the screen have a DC path to ground through the tuning coil? I
see no way that you can have grid current with no RF on the Grid. Perhaps
there is a hidden wire connecting the grid and the screen together.
I am sending you a PDF on the 813 just to make sure that you have a correct
one.
Rick,
I will be on the Gray Hair Net on 1945 at 20:30 local time tonite so
I'll go look at mine before that and send you a note.
As I remember they just relied on a stall, no slip.
Larry
At 04:47 PM 5/23/2006, you wrote:
Thanks. Mine has a porcelain coupling isolating the rheostat from
Dale,
I too was on 20 am about 1 month ago, and I talked
to Mr. Bill, VYZ. He was sipping from his W8VYZ coffee
cup from Cafe Express. No royalties go to him, but he
said he doesn't care. I think he is flattered at the
interest in his OB comments.
I was using my QRO 20a and driving that
This sounds like a class C linear screen driven amp. I couldn't find the
article on it but W9VMQ built such an amp using 6DQ5's in the early 60's. I
think he also did some experimenting with the 813 also. I think the article
was in Ham Radio magazine. Maybe someone can do a search for it. Probably
It's open from Mississippi to w9 and w0 land.
I'll monitor 29.0 for the next little while in case someone wants to try an
AM qso there.
Mike Duke, K5XU
American Council of Blind Radio Amateurs
There were 8 beacons heard here (Central NY), along with several cw
contacts...no takers on 29.0 klc
- Original Message -
From: Mike Duke, K5XU [EMAIL PROTECTED]
Date: Tuesday, May 23, 2006 8:27 pm
Subject: [AMRadio] 10 Meters Open
To: Discussion of AM Radio amradio@mailman.qth.net
I used to work WA5TLP in Williston, N.D. on 29.050. Seems like he was using
a ricebox rig of some kind.
Joe W4AAB
- Original Message -
From: Mike Duke, K5XU [EMAIL PROTECTED]
To: Discussion of AM Radio amradio@mailman.qth.net
Sent: Tuesday, May 23, 2006 7:27
32 matches
Mail list logo
