[Amps] Henry 3k Filament transformer taps

Vic, K2VCO k2vco.vic at gmail.com
Tue Sep 9 00:07:10 EDT 2014


I am not familiar with this particular transformer. But if you are 
drawing 21 amps and the voltage is still 8.75v then either

1. You are using the wrong taps.
2. Your line voltage is high.
3. The transformer is an old one rated for 230 or even 220v.
4. Your voltmeter is inaccurate. You should have one specified for "true 
RMS" measurements.
5. It might be possible the transformer has a shorted turn or turns in 
the primary. This might also make it run hot.

If the line voltage is simply too high for the transformer, you can put 
a rheostat or variac in the primary to adjust it.

On 9/9/14 4:44 AM, glenn riccio wrote:
> Yes I did that.
>
> -----Original Message-----
> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Vic, K2VCO
> Sent: Sunday, September 07, 2014 9:27 PM
> To: amps at contesting.com
> Subject: Re: [Amps] Henry 3k Filament transformer taps
>
> Remember that you need to measure the voltage under full load.
>
> On 9/8/14 2:09 AM, glenn riccio wrote:
>> Hello all you henry radio amp owners. I just bought a  Henry 3k
>> filament xfrmer off the internet. It is supposed to deliver 7.5 v @ 21
>> amps. There are taps on the primary side to adjust output .  I cannot
>> get less than 8.75 volts out. My input voltage is 240vac. I tried all
>> the taps on the primary side using #1 as the common leg. It is a
>> EC1216a  transformer. I want to use it for my 4-1000a amp I'm building.
>>
>> I suppose I could call or e-mail henry radio but they might be annoyed
>> that I'm not using it for  one of there amps. Any help would be
>> appreciated. 73 Glenn K7gfr


-- 
Vic, K2VCO/4X6GP
Rehovot, Israel
http://www.qsl.net/k2vco/


More information about the Amps mailing list