[Heathkit] HP23A help

[Bry Carling]

Good considerations too Roger. Thank you.

These will mostly be used for CW mode. I might experiment with DSB or screen mod 
AM with the WRL Meteor but it's doubtful.

73 - Bry AF4K / WN4NRR


From: wq9nsc at live.com
To: heathkit at mailman.qth.net; af4k at hotmail.com
CC: heathkit at mailman.qth.net
Subject: RE: [Heathkit] HP23A help
Date: Fri, 23 Sep 2016 19:49:39 +0000









I agree with Glen that the tubes in those rigs should normally be able to handle slightly higher voltages although in some cases a change in bias may be needed, for example if either is an AM rig then modulator bias will need to be changed
 depending upon how much higher the loaded HV is compared to the intended supply.  Realize with a number of the classic vintage rigs it was designed to only have high voltage when actually in transmit mode.  Depending upon the rig you may need to also provide
 the ability to open the high voltage line while the filament and in some cases B+ is still energized.  I had to add a relay to the Drake AC-3 I repurposed to supply my Gonset G76 for this reason.
 
Rodger WQ9E
 
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From: Glen Zook via Heathkit

Sent: Friday, September 23, 2016 10:44 AM

To: Bry Carling; 
heathkit at yahoogroups.com

Cc: heathkit at mailman.qth.net;
FL Boatanchors; 
NRR NRR; heathkit-radios at yahoogroups.com

Subject: Re: [Heathkit] HP23A help

 
What tube / tubes are used in the final amplifier stage?  Most tubes used in the final stage of amateur radio transmitters that can handle 600-volts can handle the higher voltage from the Heath power supply without any problems.  Under
 load the voltage should drop to between 700-volts and 750-volts.
 Glen, K9STH 
Website: http://k9sth.net
 
   
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