[Amps] Need help Yaesu FL2100Z

[Osten B Magnusson]

Hi Peter and all others!

Did replace the whole RF-choke with capacitor etc. Still have low bias
and also 50 mA in ''stand by'', goes up to 60 mA when in ''operate mode'',
it's possible to tune quickly, but one of the tube anodes get very ''red''.
Don't think what you suggested was the problem, any other hints? The
meter has never shown any Ip in ''stand by'' before...

73 de Osten SM5DQC   sm5dqc at algonet.se

----- Ursprungligt meddelande ----- 
Från: "Peter Frenning, OZ1PIF" <oz1pif at get2net.dk>
Till: "Osten B Magnusson" <sm5dqc at algonet.se>; <amps at contesting.com>
Skickat: den 8 april 2003 14:11
Ämne: Re: [Amps] Need help Yaesu FL2100Z


> Sounds to me as if the transfer/isolation cap between plate and tank circuit
> is suspect!
> 
> Vy 73 de OZ1PIF, Peter
> http://hjem.get2net.dk/oz1pif

> > Dear friends!
> >
> > My old FL2100z just does not work...   I get nothing out, tubes
> > are OK when checked in another amp. The only thing that
> > happens is that I now have around 50 mA Ip even with the
> > switch in stand-by position. The R5, 820 ohm resistor for
> > bias is burned and shows 670 ohms, should be 820 ohms.
> > I did replace it, but no change. The input from the transformer
> > to the PB-1903 circuit board is correct, but only around 6 volts
> > bias out from that circuit board.
> >
> > Any hints what to look for. Please answer direct to
> >
> > sm5dqc at algonet.se
> >
> > and when I cured the problem I will let you all know. Many thanks
> > in advance!
> >
> > 73 de Osten  SM5DQC
> >
> >
> >
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> 
> 
> 
> 
>