[Hammarlund] Hammarlund Digest, Vol 70, Issue 8
Katsuhiko Hirai
mxc04040 at nifty.ne.jp
Sat Nov 21 22:08:57 EST 2009
Dear John and Doug,
Good evening to you.
I found the schematics of BC-779 (would be?) at the following URL:
http://pub.ne.jp/bluemac/?entry_id=557032
Even though it is very old paper of the Japanese magazine in 1938,
I sent a message to request to get the high resolution version of copy.
After getting reply, I will translate the interface pin specification of
voltage for you.
Now, it's very cold morning in Yokohama, Japan.
Have a nice weekend,
Katsuhiko JO1GEG/JA3ECA/exN8EYH
On Sat, 21 Nov 2009 12:00:28 -0500
hammarlund-request at mailman.qth.net san wrote:
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> Today's Topics:
>
> 1. Re: WTB;Power Supply (ddswl) (John Hensley)
> 2. Re: WTB;Power Supply (ddswl) (DJED1 at aol.com)
> 3. Re: WTB;Power Supply (ddswl) (Al Parker)
> 4. Re: WTB;Power Supply (ddswl) (DJED1 at aol.com)
> 5. SP 200 Power Supply (Bill & Becky Marvin)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 20 Nov 2009 17:07:45 +0000
> From: John Hensley <w5jv at hotmail.com>
> Subject: Re: [Hammarlund] WTB;Power Supply (ddswl)
> To: <hammarlund at mailman.qth.net>
> Message-ID: <BAY109-W35EFF9A993B5AE26EE7B0891A10 at phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
>
>
> Wish I could find one near me as well. Has anyone ever (actually) identifiedthe p.s. voltage requirements? The docs I have seen are clear as mud.
>
>
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Thu, 19 Nov 2009 20:41:49 -0800
> > From: "ddswl" <ddswl at centurytel.net>
> > Subject: [Hammarlund] WTB;Power Supply
> > To: "Hammarlund" <hammarlund at mailman.qth.net>
> > Cc: Forsale-Swap <forsale-swap at mailman.qth.net>
> > Message-ID: <3F26EB098C4C414589490A7D768E17C8 at DEWEESE>
> > Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> > reply-type=original
> >
> > In need of a power supply for a Hammarlund SP200, SP400 or BC77B. If you can
> > help, please e-mail me direct. Tnx----Doug W7LNB ddswl at centurytel.net
> >
> >
>
>
> _________________________________________________________________
> Windows 7: It works the way you want. Learn more.
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> ------------------------------
>
> Message: 2
> Date: Fri, 20 Nov 2009 12:33:43 EST
> From: DJED1 at aol.com
> Subject: Re: [Hammarlund] WTB;Power Supply (ddswl)
> To: w5jv at hotmail.com, hammarlund at mailman.qth.net
> Message-ID: <bbb.5edec283.38382cf7 at aol.com>
> Content-Type: text/plain; charset="US-ASCII"
>
> I think all the voltage requirements are spelled out in the military tech
> manual for the BC-779 etc. Probably the only missing info is the current
> requirements. I can probably dig up the info if anyone is interested.
> Ed
>
>
> ------------------------------
>
> Message: 3
> Date: Fri, 20 Nov 2009 13:10:11 -0500
> From: "Al Parker" <anchor at ec.rr.com>
> Subject: Re: [Hammarlund] WTB;Power Supply (ddswl)
> To: <DJED1 at aol.com>, <w5jv at hotmail.com>, <hammarlund at mailman.qth.net>
> Message-ID: <77130D9169D347F2BDB0E2AE58B98102 at HOME>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> Hi Folks,
> Here's what I wrote about p.s. reqmts several yrs ago when I did an
> SP-210LX. You can find it and more on my website at
> http://www.boatanchors.org/SP200.htm
> ---------------------------------
> (before doing anything in the p.s., but with a recapped rcvr)
> I checked voltages from the power supply, and at tube sockets. The supply
> should give +140vdc, +270vdc, +385vdc, -50vdc and 6.3vac. The high voltage
> lines were -50, 110, 240, and 330, & I measured 10, 4, 65, & 42 ma on each.
> I had already changed the AC line tap on the transformer to the 125 VAC
> position, and my line voltage was 122, so I expected things to be close,
> maybe a little on the low side, but not this much, particularly on the
> 140volt screen supply. The tubes were only seeing about 100v on the
> screens, after their dropping resistors.
> The power supply, at 60 lbs, is not under designed. The screen voltage
> is supplied from the 270vdc line using a voltage divider/bleeder resistor,
> which checked out OK when cold, but apparently drifted high when heated
> under power. It was changed to supply close to 140vdc, and receiver
> sensitivity seemed to improve.
>
> ------------------------------------
>
> ----- Original Message -----
> From: <DJED1 at aol.com>
> To: <w5jv at hotmail.com>; <hammarlund at mailman.qth.net>
> Sent: Friday, November 20, 2009 12:33 PM
> Subject: Re: [Hammarlund] WTB;Power Supply (ddswl)
>
>
> >I think all the voltage requirements are spelled out in the military tech
> > manual for the BC-779 etc. Probably the only missing info is the current
> > requirements. I can probably dig up the info if anyone is interested.
> > Ed
> > ______________________________________________________________
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> ------------------------------
>
> Message: 4
> Date: Fri, 20 Nov 2009 20:27:25 EST
> From: DJED1 at aol.com
> Subject: Re: [Hammarlund] WTB;Power Supply (ddswl)
> To: anchor at ec.rr.com, w5jv at hotmail.com, hammarlund at mailman.qth.net
> Message-ID: <cd9.60ed087a.38389bfd at aol.com>
> Content-Type: text/plain; charset="US-ASCII"
>
> Here's what I estimate based on the TM and my experience.
> The voltages are out of the TM, but some numbers are inconsistent, so I've
> used what I think is correct. I've had to estimate current requirements
> based on tube data and my experience.
>
> Starting from the right terminal on the receiver/power supply
>
> 1. 6.3 V ground
> 2. 6.3V hot 7A est.
> 3. chassis ground
> 4. +140V screens 20ma est.
> 5. +270V plate volt 60ma est.
> 6. +385 output plate volt 50 ma est.
> 7. -50V grid bias 10ma est
> 8. AC switch
> 9. AC switch
> 10. not used
>
> If you do get your hands on a power supply remember that there is no
> regulation, so the open circuit voltages are much higher i.e. 500V vs 385V. So
> only measure the voltages with the PS hooked up to an operating receiver.
> Hope this helps
> Ed W2EMN
>
>
>
> ------------------------------
>
> Message: 5
> Date: Fri, 20 Nov 2009 20:24:13 -0600
> From: "Bill & Becky Marvin" <wmarvin at hickorytech.net>
> Subject: [Hammarlund] SP 200 Power Supply
> To: <hammarlund at mailman.qth.net>
> Message-ID: <2384615B7414401DB54F97EFDA5431DD at yourb27fb1c401>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hello Group I have in my garage a Heavy weight Power Supply for a non-repairable SP 200 (for parts) Thus I have no need for the PS Square Monster nor do I know it functional condition. ..........it's dirty but complete with wires etc.
>
> I don't know a value would be but shipping will be high? I'm at Waseca, MN 56093
>
> I can take some photo's tomorrow if you like...........can email me at wmarvin at hickorytech.net
>
> Hope I can help.
>
> 73
>
> Bill KB9IV
>
> ------------------------------
>
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> End of Hammarlund Digest, Vol 70, Issue 8
> *****************************************
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平井勝彦 <mxc04040 at nifty.ne.jp>
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