Thanks to all that replied. I change the taps from the 110vac over to the
117vac taps and then I ended up taking the easy way out because I had the
wire on hand and added 20" of 20awg wire to each leg of the filament. The
filament voltage is within spec, the HV is closer to normal and all is well.
Ken
N4zed
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Alek Petkovic
Sent: Saturday, December 10, 2016 8:37 PM
To: Amps@contesting.com
Subject: Re: [Amps] Line voltage high.
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@gmail.com>
> wrote:
>
>
>> On 11/12/16 06:00, "Ken Durand"<N4zed@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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>>
>>
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