Hi again Osten,
It could also be C8 or C9 (tying the grids to ground), I had one of these
going bad, and that caused precisely what you are describing with one tube
getting very hot and no output.
Vy 73 de OZ1PIF, Peter
********** OZ1PIF **************
email: oz1pif(no-spam-filler)@get2net.dk
http://hjem.get2net.dk/oz1pif
Ph. +45 4619 3239
Snailmail:
Peter Frenning
Ternevej 23
DK-4130 Viby Sj.
Denmark
***********************************
----- Original Message -----
From: "Osten B Magnusson" <sm5dqc@algonet.se>
To: "Peter Frenning, OZ1PIF" <oz1pif@get2net.dk>; <amps@contesting.com>
Sent: Tuesday, April 08, 2003 2:57 PM
Subject: Re: [Amps] Need help Yaesu FL2100Z
>
>
> 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@algonet.se
>
> ----- Ursprungligt meddelande -----
> Fr?n: "Peter Frenning, OZ1PIF" <oz1pif@get2net.dk>
> Till: "Osten B Magnusson" <sm5dqc@algonet.se>; <amps@contesting.com>
> Skickat: den 8 april 2003 14:11
> ?mne: 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@algonet.se
> > >
> > > and when I cured the problem I will let you all know. Many thanks
> > > in advance!
> > >
> > > 73 de Osten SM5DQC
> > >
> > >
> > >
> > > _______________________________________________
> > > Amps mailing list
> > > Amps@contesting.com
> > > http://lists.contesting.com/mailman/listinfo/amps
> >
> >
> >
> >
> >
>
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