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13648

AWA John Rollins Memorial DX Contest Just a reminder to all. Because the Winter Issue of "The Journal" is behind schedule, it will probably not get to readers before the contest. Therefore,

w1gig@att.net
12:22 PM
#13648
 

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13647

More items for the Friday auction I've received some more photos of items that will be included in the Friday afternoon auction. These are part of the Ralph Moorhouse estate collection. You can

Ron Lawrence
10:57 AM
#13647
 

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13646

Wanted: Loop assembly for Zenith 54 or 60 series Wanted: Loop assembly for Zenith 54 or 60 series Friends, I am working on a Zenith 54 and have discovered the loop has been removed. I am looking for a

radiocats4
Feb 19
#13646
 

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13645

Fwd: Gerald Wells Valveman I watched this and overall it was pretty good, typical British type movie. - John ... From: J Gillespie To: "boatanchors" Sent: Friday, February 13, 2015

k2tqn
Feb 14
#13645
 

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13644

RadioWorld - AWA Saves a Piece of Delano Station by James O'Neal, K4 Big, I mean really BIG, article in the February 11, 2015 RadioWorld Magazine. You won't want to miss this story about the 250kW Collins transmitter which was

k2tqn
Feb 12
#13644
 

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13643

Re: Hollow-state negative voltage regulator? ... I was thinking of a totem pole stage, which I have seen used as an audio amplifier, but I have not seen it used in a regulator. Dale H. Cook, GR / HP

Dale H. Cook
Feb 12
#13643
 

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13642

Re: [AWA Group] Hollow-state negative voltage regulator? Thanks, Mike. You as well as Richard, AA1P on the Glowbugs list essentially made the same suggestion, and I played with the schematic and figured it out

Larry Szendrei
Feb 11
#13642
 

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13641

Re: Hollow-state negative voltage regulator? On 2/11/15 7:03 AM, 'Dale H. Cook' bridgewaterma@... ... The range of -65 to -140V should do it - on the smaller (in magnitude) range for class

Larry Szendrei
Feb 11
#13641
 

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13640

Re: Hollow-state negative voltage regulator? ... Larry - Before I start digging what voltage range do you need? This intrigues me. I don't have a good EE library in town, but there is one at a major

Dale H. Cook
Feb 11
#13640
 

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13639

Re: Hollow-state negative voltage regulator? On 2/10/15 9:22 PM, 'Dale H. Cook' bridgewaterma@... ... Thanks, Dale. Yeah, I looked at my copy of Langford-Smith RDH4 but didn't see anything.

Larry Szendrei
Feb 10
#13639
 

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13638

Re: Hollow-state negative voltage regulator? ... I know how to do that with solid state, but have not seen it done in a tube regulator. Have you trolled through RDH4 to see if it can suggest anything?

Dale H. Cook
Feb 10
#13638
 

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13637

Re: Hollow-state negative voltage regulator? On 2/10/15 6:35 PM, 'Dale H. Cook' bridgewaterma@... ... Strangely enough, in my application it's not any current I'm drawing that's the

Larry Szendrei
Feb 10
#13637
 

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13636

Re: Hollow-state negative voltage regulator? ... How much current are you drawing? Dale H. Cook, GR / HP Collector, Roanoke/Lynchburg, VA http://plymouthcolony.net/starcity/radios/index.html

Dale H. Cook
Feb 10
#13636
 

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13635

Re: Hollow-state negative voltage regulator? Hi Dale, Thanks for the response and the schematic, but while the positive output of that supply is electronically regulated, the-bias supply is not. The

Larry Szendrei
Feb 10
#13635
 

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13634

Re: Hollow-state negative voltage regulator? ... There were many regulated bias supplies in the tube era. I have one in the shop, part of a Hewlett-Packard 712A power supply ca. 1962. I have posted the

Dale H. Cook
Feb 10
#13634
 
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