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Re: [Amps] What to do about 'Neutral' in HB amp?

To: amps@contesting.com
Subject: Re: [Amps] What to do about 'Neutral' in HB amp?
From: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Sat, 31 Dec 2022 07:45:12 +0200
List-post: <mailto:amps@contesting.com>
Steve,

Keep in mind that most of the step up/down transformers sold are actually autotransformers. One side of the primary is connected to one side of the secondary. This should not be a problem regarding operating your 120v stuff, but don't ground either side of the secondary.

73,
Victor, 4X6GP
Rehovot, Israel
formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/

On 31/12/2022 1:25, Steve Bookout wrote:
Hello all,

My question was not intended to start a 'smartest man in the room' debate.  I just had a genuine question.  Electronics is my hobby and never was my profession, so I can't get into the 'Grey matter debates'.

I did get several good responses to my original question and have decided on a course of action.   This amp is being built with parts gathered, here and there, over 4 decades, so not much is 'ideal'.

My several blowers are all 120 volt.

I do not have a 120/240 volt filament I can use to use the dual input windings center tap as a neutral.

I have ordered a 500 watt 240>120 step down transformer.  I will have one side feeding my 120 volt items and the other side as a common neutral.

My DC power supply has an input of 88 to 264 volts, so that is not a problem.  Just a couple of relays, filament transformer  and blower.

I have room for the transformer as I'm building this 8877 10 meter amp in a waist high rack cabinet.

I'm sure it will work out fine.  If it doesn't, I just tie the 'downstream side' of the 120 volt item to the chassis and not tell anyone. 8^)

When I kick your butts in some contest on 10 meters, it might be with an amp with the neutral tied to the chassis 8^)

Seriously, thanks for the useful input.

73 de Steve,  NR4M

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