[Amps] OMPower 2000+ Heater voltage ? is 8.6 to 8.7 volt heater enuf?

[Carl]

A couple of thoughts

What is the gettering/regettering process of that particular series of 
tubes? An arc is often caused by internal gases released when the tube is 
overheated.

Are you using a True RMS meter to read the filament voltage at the socket? 
If it is consistently low consider adding an external transformer and small 
variac, 10V transformers are common. I have never liked combining filament 
and HV transformers in one unit.

OTOH the manual claims that the boundaries are +/- 2.0V so why the 
obsessions from many about that voltage?  If there is a valid reason for 
precision then by all means do it.

Carl




----- Original Message ----- 
From: "Edward stallman" <ed.n5dg at gmail.com>
To: "'amps'" <amps at contesting.com>
Sent: Saturday, September 21, 2019 10:40 PM
Subject: [Amps] OMPower 2000+ Heater voltage ? is 8.6 to 8.7 volt heater 
enuf?


>I was reading with entrust about the FU728 tube failure and heater voltage 
>. I understand the heater voltage should be 9 volts , Checking my heater 
>voltage on my new OMPower 2000+ It's reading 8.7 volts most of the time , 
>sometimes flickering to 8.8 volts .... I've seen it as low as 8.5 volts on 
>occasion's . At 1500 watts much less ..This has been a concern sense buying 
>the amp close to two months ago . I've had one tube arc last week that blew 
>a small fuse near the tube while using it on SSB . The amp was tuned 
>properly and I was not tuning when the fuse blew .
>
> Am I safe with the heater voltage at these levels ?
>
> When the fuse went , I was thinking of moving the tap from 240V to 230V 
> but it was already on the 230V tap ... Thought about moving it to 220 but 
> left it where it was at . My line voltage reads 240 to 245.
>
> Thanks for reading , like to hear your thoughts . Ed N5DG
>
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
> 


---
This email has been checked for viruses by AVG.
https://www.avg.com