[Amps] Line voltage high.

[Alek Petkovic]

At 244V, the filament voltage will still be around 6.8v. You'll still 
need that resistance. I've done a million 2100 series amps with a 
ser5ies/parallel combination of low value 5W wirewound resistors. 
There's enough room to mount them under the chassis, in the filament line.

73, Alek
VK6APK

PS: Well, not actually a million but you know what I mean. :-)



On 11/12/2016 4:14 AM, Mike Waters wrote:
> I thought he said the problem was a bad voltmeter. If not, your advice
> about the resistor is perfect. :-)
>
> 73, Mike
> www.w0btu.com
>
> On Sat, Dec 10, 2016 at 2:01 PM, Steve Wright<stevewrightnz at gmail.com>
> wrote:
>
>    
>> On 11/12/16 06:00, "Ken Durand"<N4zed at comcast.net>  wrote:
>>
>>      
>>> Hi group, I checked the filament voltage on my FL2100b and it is at 7.2
>>> volts or there about. So I then checked the line voltage going to the amp
>>> and it is 257 vac, the amp was built for 220v. The HV is at 2500v. What
>>> would be the best way of reducing the filament voltage down to 6.3 volts?
>>> The HV is still within the tube voltage ratings. I don't have a 240 v
>>> variac.
>>>
>>>        
>> I'd be temped to use some sort of resistor.  The load doesn't vary at all.
>>
>> Even just a piece of smaller diameter wire coiled up and tucked in there
>> should do it.
>>
>>
>> Steve
>>
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