[Heathkit] HP23A help

[Rodger Singley]

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<mailto:heathkit at mailman.qth.net>
Sent: Friday, September 23, 2016 10:44 AM
To: Bry Carling<mailto:af4k at hotmail.com>; heathkit at yahoogroups.com<mailto:heathkit at yahoogroups.com>
Cc: heathkit at mailman.qth.net<mailto:heathkit at mailman.qth.net>; FL Boatanchors<mailto:flboatanchors at yahoogroups.com>; NRR NRR<mailto:novicerigroundup at yahoogroups.com>; heathkit-radios at yahoogroups.com<mailto: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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