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Subject: glowbugs V1 #24
glowbugs              Monday, May 5 1997              Volume 01 : Number 024


Date: Mon, 5 May 1997 01:59:48 +0000
From: Sandy W5TVW <ebjr@worldnet.att.net>
Subject: FS/FT: Bendix connectors

A lot of Bendix Military Bayonet connectors (all cable types with cable clamps)
NOS in  with gold-plated inserts (male or female pins) in seperate containers.
each set sealed in poly bags.  I have about 50 of each of the numbers below.
If someone is interested in the whole lot, I'll include the special pin inserter
and the pin crimping tool.  These connectors cost around $6-10 back in the late
1970's! (each)  Each is packed with a "Silver Saver" to prevent corrosion.

Types I have:  PTO1CE-18-32P (SR)  32-pin male
                      PT06CE-18-32S (SR)   32-pin female
                      PT01CE-14-19P (SR)   19-pin male
                      PT06CE-14-19S (SR)   19-pin female

Anyone interested in just a few, I'll sell them for $5 a set (male and
mating female)
If anyone is interested in the entire lot, I'll sell them for $200 and throw
in the tooling.
All prices exclusive of shipping costs.  The tooling today is easily worth this.
These are very nice connectors for someone needing some compact,
very high quality, MIL-spec multiwire connectors.
I am also open to trades for boat anchor Radio gear, test gear.

Sandy W5TVW
E. V. Sandy Blaize, W5TVW
"Boat Anchors collected, restored, repaired, traded and used!"
417 Ridgewood Drive,
Metairie, LA., 70001
ebjr@worldnet.att.net
**Looking for:  860 tubes, WL-460 tubes**
**Butternut HF2V antenna, G-R test gear.....................***



Date: Mon, 5 May 1997 07:26:57 -0400
From: BEN NOCK <106312.1035@compuserve.com>
Subject: GRC109 and 123 set

Somebody said this :

>The British SAS had a version called the Mk-123 set that was housed in a
>wooden case, had a built in straight key, put out about 10 watts and had
>a tuneable RX from 2-18 mc (if I remember correctly). I bought one in the
>UK about 15 years ago and very stupidly sold it. 


Well, in fact the 123 is supplied in a canvas case, runs about 20-30 
watt depending on freq, and has questionable SAS connection.

If anyone wants to read about it, see my article on the
123 in Radio Bygones, copies available from them.

Ben G4BXD.



Date: Mon, 5 May 1997 10:27:10 -0700 (MST)
From: Jeff Duntemann <jeffd@coriolis.com>
Subject: A $3.99 power transformer

Hi gang--

I ordered a power transformer (two of them, actually) from Burden's Surplus
Center, which is NOT a hotbed of RF parts procurement.  (Mostly, they sell
hydraulic cylinders.)  However, they offered this NOS military surplus
transformer for $3.99 so I bought a couple.  It was billed as 6.3V @ 3A and
315V @ 20ma.

The transformer comes embedded in foam inside a cardboard box dated 1973.
It's completely sealed in the usual military style, with 4 6-32 mounting
bolts and solder lugs on the bottom.  The inscription indicates that it's
rated 20ma continuous at 315VDC, but it can supply 50ma at a duty cycle of
5 min/hour.

I was hoping it was 315V CT, (which would make it ideal for small receiver
projects) but when I tested it I found that the HV secondary is 600VCT.
The center tap is internally grounded to the case--as is the center tap on
the filament winding.

315VDC is about what you'd get out of it with a half-wave silicon diode
rectifier, as my line voltage is 124V (!!!) and that 600VCT figure is
probably a little high.  I was thinking it would make a good supply for the
6T9er, but the 6T9 has a design maximum plate voltage of 275V.  So what we
need is a triode/pentode that can take 315-320V on the plates safely and
put out about 6 watts or a little less.  (The transformer can probably
provide no more than 14-15W input.)

Any suggestions?

In any event, this is a mil-spec unused transformer for $4.  A QRP gem.
Here's the pointer:

Burden's Suplus Center
1015 W. "O" Street
PO Box 82209
Lincoln NE 68501-2209

1-800-488-3407

The transformer is Item # 15-1057.

Their catalog is worth having, as it lists a lot of motors and isolation
transformers.

- --73--

- --Jeff Duntemann KG7JF
  Scottsdale, Arizona



Date: Mon, 05 May 1997 14:35:47 -0400
From: John Levreault <jlevro@shore.net>
Subject: Re: A $3.99 power transformer

At 10:27 AM 5/5/97 -0700, Jeff Duntemann wrote:
>
>I ordered a power transformer (etc, etc, etc)
>I was hoping it was 315V CT, (which would make it ideal for small receiver
>projects) but when I tested it I found that the HV secondary is 600VCT.
>The center tap is internally grounded to the case--as is the center tap on
>the filament winding.
>
>315VDC is about what you'd get out of it with a half-wave silicon diode
>rectifier, as my line voltage is 124V (!!!) and that 600VCT figure is
>probably a little high.  I was thinking it would make a good supply for the
>6T9er, but the 6T9 has a design maximum plate voltage of 275V.  So what we
>need is a triode/pentode that can take 315-320V on the plates safely and
>put out about 6 watts or a little less.  (The transformer can probably
>provide no more than 14-15W input.)
>
>Any suggestions?
>
>

Yes. You could use an LC filter after your rectifier. You will need
something like 80 or 100H, though.

However, a better idea would be to simply drop the extra voltage with a
resistor. We're not talking much power here. To drop 40V at 20ma only
requires 2Kohms at 0.8W. Use a 2 or 3W resistor to be on the safe side.
Panasonic sells some nice (flameproof, take it from one who knows) metal
oxides in 2 and 3W sizes for cheap. 

Use a full wave rectifier, too, since you've already got the secondary
center tap grounded. If you're interested in the hollow variety, a 6X4
should do the trick.


73 de NB1I
John Levreault



Date: Mon, 5 May 97 14:55:21 EDT
From: jkh@lexis-nexis.com (John Heck)
Subject: Re: A $3.99 power transformer

For anybody who needs a power transformer for 2.5 volt filament tubes I have the
following:

Stancor P-6003 Power Transformer New in Box
   350-0-350    70 ma
   2.5v  C.T.    3 amp  <============ NOTE
   5v    C.T.    9 amp
    This is a Horizontal Half Shell transformer with box and instruction sheet
    $20 plus postage

FMA #9342 Power Transformer New In Box
   325-0-325   50 ma
   2.5v  C.T.  1.75 amp  <============ NOTE
   5v    C.T.  3 amp
    This is a horizontal Half Shell transformer in original cardbord wrapper
    with enough(silverfish got 'em) of the instruction sheet to read specs. 
    $10 plus postage.

Regards,
John Heck, KC8ETS
1009 Donson Drive
Dayton, Ohio 45429
(513)865-7036(work)
jkh@lexis-nexis.com
  

> At 10:27 AM 5/5/97 -0700, Jeff Duntemann wrote:
> >
> >I ordered a power transformer (etc, etc, etc)
> >I was hoping it was 315V CT, (which would make it ideal for small receiver
> >projects) but when I tested it I found that the HV secondary is 600VCT.
> >The center tap is internally grounded to the case--as is the center tap on
> >the filament winding.
> >
> >315VDC is about what you'd get out of it with a half-wave silicon diode
> >rectifier, as my line voltage is 124V (!!!) and that 600VCT figure is
> >probably a little high.  I was thinking it would make a good supply for the
> >6T9er, but the 6T9 has a design maximum plate voltage of 275V.  So what we
> >need is a triode/pentode that can take 315-320V on the plates safely and
> >put out about 6 watts or a little less.  (The transformer can probably
> >provide no more than 14-15W input.)
> >
> >Any suggestions?
> >
> >



Date: Mon, 5 May 1997 14:16:31 -0500 (CDT)
From: Dave <gekko95@ix.netcom.com>
Subject: RE: 3.99 Power Transformer

>In any event, this is a mil-spec unused transformer for $4.  A QRP gem.
>Here's the pointer:

>Burden's Suplus Center
>1015 W. "O" Street
>PO Box 82209
>Lincoln NE 68501-2209

>1-800-488-3407

>The transformer is Item # 15-1057.




Hey Jeff et al,

Just called 'em up and ordered my 2 such power transformers!  The guy who
took the order, when told I had heard of them through a mailing list on
the internet, said 'wow! another one!', so they must be getting flooded
with calls for this choice little find!  Sure seems like a useable unit,
even if only for the filamant winding!

Order fast before they're all gone <GG>


Dave WB7AWK






* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
                   And on the Seventh Day, God rested.  Day Eight, 
		     thing One, He made 35EH5's, and He said:
		     "Gee, these things are worthless.  Yuk"
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 



Date: Mon, 5 May 1997 14:46:08 -0500 (CDT)
From: mjsilva@ix.netcom.com (michael silva)
Subject: Re: A $3.99 power transformer

Jeff wrote: 

>... I was thinking it would make a good supply for the
>6T9er, but the 6T9 has a design maximum plate voltage of 275V.  So 
>what we need is a triode/pentode that can take 315-320V on the plates 
>safely and put out about 6 watts or a little less.  (The transformer 
>can probably provide no more than 14-15W input.)
>
>Any suggestions?

Hey Jeff, our forebearers would have happily put 400 or more volts on 
it (once they stopped laughing at how it looks!).  You can lower the 
output voltage by using a tube rectifier and/or a choke input filter.  
Of course, the rectifier is just being resistive, while the choke input 
will boost the current output in addition to dropping the voltage.  
Another approach to lowering the plate-cathode voltage is to divide the 
grid bias up between grid leak and cathode bias rather than relying 
solely on grid bias.  In the '48 Handbook there's a two-tuber that does 
this. (This is the one I'm sending you, Matt)

73,
Mike, KK6GM



Date: Mon, 5 May 1997 13:24:31 -0700 (MST)
From: Jeff Duntemann <jeffd@coriolis.com>
Subject: Re: A $3.99 power transformer

At 02:46 PM 5/5/97 -0500, Jeff KG7JF wrote: 
>
>>... I was thinking it would make a good supply for the
>>6T9er, but the 6T9 has a design maximum plate voltage of 275V.  So 
>>what we need is a triode/pentode that can take 315-320V on the plates 
>>safely and put out about 6 watts or a little less.  (The transformer 
>>can probably provide no more than 14-15W input.)
>>
>>Any suggestions?
>
>Hey Jeff, our forebearers would have happily put 400 or more volts on 
>it (once they stopped laughing at how it looks!).  You can lower the 
>output voltage by using a tube rectifier and/or a choke input filter.  
>Of course, the rectifier is just being resistive, while the choke input 
>will boost the current output in addition to dropping the voltage.  
>Another approach to lowering the plate-cathode voltage is to divide the 
>grid bias up between grid leak and cathode bias rather than relying 
>solely on grid bias.  In the '48 Handbook there's a two-tuber that does 
>this. (This is the one I'm sending you, Matt)

As usual, the group provides more than I asked for.  What I meant was, Any
suggestions on a tube that will do what a 6T9 will do but tolerate higher
voltage.  But I hadn't even thought about the effect of a choke-input
filter.  That will certainly work, as would putting in resistors or a tube
rectifier.  But since power is dissipated in any such scheme I wanted to
avoid doing that, since the transformer sources too little to begin with,
and I'd just as soon give all it can give to the oscillator/final to turn
into radio waves.  (Yes, I know half goes to heat anyway...)

Thanks to all for the suggestions.  Would still like to know of a 6T9-like
tube that can take 350 volts or so.

- --73--

- --Jeff Duntemann KG7JF
  Scottsdale, Arizona



Date: Mon, 5 May 1997 20:39:15 +0000
From: Sandy W5TVW <ebjr@worldnet.att.net>
Subject: Info Needed: Solar CF

        Looking for a copy of an instruction manual for the Solar Electric Model
CF "Exam-eter" capacitor analyzer.  Something like a Sprague Tel-Ohmike.
Anybody have any poop out there?

73,
E. V. Sandy Blaize, W5TVW
"Boat Anchors collected, restored, repaired, traded and used!"
417 Ridgewood Drive,
Metairie, LA., 70001
ebjr@worldnet.att.net
**Looking for:  860 tubes, WL-460 tubes**
**Butternut HF2V antenna, G-R test gear.....................***



Date: Mon, 5 May 1997 18:43:19 -0400 (EDT)
From: leeboo@ct.net (Leon Wiltsey)
Subject: WTB Heath manuals

Hi Gand 
in the past have seen posted addresses for
suppliers of manuals for Heath kits.
 can anybidy supply me with this info? tnx 73



Thank the good LORD for all that you have!!!

Leon B Wiltsey jr. (Lee)
4600 Lake Haven blvd...
Sebring fl 33872.............

68yr old retired  semi disabled senior
(stroke got my balance and hand to eye coordination)
formerly w4kcj & kp4ryb ( till I quite) dumb dumb
NOW KF4RCL MUCH  HAPPINESS
play keyboard and sing
music 1920's to 60'
none of the 80'S- 90'S noise



Date: Mon, 5 May 1997 16:13:34 utc
From: wb0aaq@juno.com (FREDERICK I VAN ARTSDALEN)
Subject: Re:  AN/GRC109

Hi Gang,
   I'm curious and have an idea...........How many of us have an
AN/GRC109
setup?  Let me know....just say "I have one"...and I'll post my idea to
the
list in a couple days.
  You can say more....I don't care........just wanting to keep it simple
for ya.
                                    
                                        73 es real radios DO glow in the
dark!
                                                                         
               Ike WB0AAQ
                                                                         
        wb0aaq@juno.com                                                  
                     
                                                                         
        



Date: Mon, 5 May 1997 19:39:35 -0500 (CDT)
From: "Carol N. Wright" <cnw@HiWAAY.net>
Subject: Re: WTB Heath manuals

Hey Leon.
Try http://www.w7fg.com
Best 72/73 DE Matt, AE4JM



Date: Tue, 6 May 1997 01:29:17 +0000
From: Sandy W5TVW <ebjr@worldnet.att.net>
Subject: BA NET: 40 mtrs

        Standing by on 7050 to try a portable setup out.  Where did all the
BA/GB
bunch go?  It's been very noisy here until the last coupla days!
73,
E. V. Sandy Blaize, W5TVW
"Boat Anchors collected, restored, repaired, traded and used!"
417 Ridgewood Drive,
Metairie, LA., 70001
ebjr@worldnet.att.net
**Looking for:  860 tubes, WL-460 tubes**
**Butternut HF2V antenna, G-R test gear.....................***



Date: Mon, 05 May 1997 21:53:24 -0800
From: "catherine a dumar westelcom.com" <cjdumar@westelcom.com>
Subject: Re: AN/GRC109

   :CC: wb0aaq@juno.com
   :Hi Gang,
   :I'm curious and have an idea...........How many of us have an
   :AN/GRC109
   :setup?  Let me know....just say "I have one"...and I'll post my
   :idea to the
   :list in a couple days.
   :You can say more....I don't care........just wanting to keep it
   :simple for ya.
   :73 es real radios DO glow in the
   :dark!
   :Ike WB0AAQ
   :wb0aaq@juno.com


I have one

Charlie, KA2VCS (cjdumar@westelcom.com)

Two can live as cheaply as one, for half as long.

Net-Tamer V 1.09 Beta - Registered



Date: Mon, 5 May 1997 21:25:38 -0500 (CDT)
From: mjsilva@ix.netcom.com (michael silva)
Subject: Transformer Ratings (was Re: A $3.99 power transformer)

Prompted by the comments regarding expected output from a transformer I 
thought I'd pass along a nice summary, found in the current Hammond 
catalog:

Half Wave, Cap. input filter
 Vpeak = 1.41 * Vsec
 Vavg = 0.9 * Vsec
 I D.C. = 0.28 * Isec

Full Wave, Cap. input filter
 Vpeak = 0.71 * Vsec
 Vavg = 0.45 * Vsec
 I D.C. = 1.0 * Isec

Full Wave, Choke input filter
 Vpeak = 0.45 * Vsec
 Vavg = 0.45 * Vsec
 I D.C. = 1.54 * Isec

Bridge, Cap. input filter
 Vpeak = 1.41 * Vsec
 Vavg = 0.9 * Vsec
 I D.C. = 0.62 * Isec

Bridge, Choke input filter
 Vpeak = 0.9 * Vsec
 Vavg = 0.9 * Vsec
 I D.C. = 0.94 * Isec

where Vsec and Isec are the AC RMS ratings of the transformer 
secondary.  The average values naturally depend somewhat on the filter 
constants, etc.  While the voltage numbers are commonly found in 
handbooks I had not seen the current ratings listed before.  With 
diodes less than 10c each it makes you never want to build another 
half-wave rectifier, doesn't it?

73,
Mike, KK6GM



End of glowbugs V1 #24
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