[Amps] 3cx800 13.5Vac 3amp filament transformer

[Steve London]

I have a Radio Shack 18 volt, 4 amp transformer that I have been using with a 
dropping resistor for a pair of 3CX800's. It makes me nervous, because if a 
filament opens on one tube, the filament voltage on the other tube would spike.

I would like to remove some turns from the secondary and bring it down to 13.5 
volts. Doesn't look like a trivial task to disassemble it. Suggestions ?

73,
Steve, N2IC

On 04/29/2020 07:03 PM, Jim wrote:
> 2ea 3cx800s only draw 3 amps. I use a small (12.6V 3A)  radio shack transformer 
> and simply added more turns to the secondary for my 2X 3cx800 amp. Still working 
> after 20 years.
> 
> 
> 
> Thanks
> 73
> Jim W7RY
> 
> On 4/29/2020 7:59 PM, Robert wrote:
>>
>> Looking for recommendations of where/who to purchase 13.5Vac filament
>> transformer
>>
>>
>> story:
>>
>> Have several RS 12.6Vac rated 3Amps and those work fine for Single 3cx800
>> (measure 13.4Vdc)
>>
>> Now have project with dual 3cx800
>>
>>
>> Thanks
>>
>>
>> 73 W5AJ
>>
>>
>> Robert
>>
>> Midland, Texas
>>
>>
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