Re: [Amps] GU-74b amp by UX1UX

["Carl" <km1h@jeremy.mv.com>]

Will you guys get your GU's and FU's correct!

Carl
KM1H.


----- Original Message ----- 
From: "Roger (K8RI)" <k8ri@rogerhalstead.com>
To: <amps@contesting.com>
Sent: Friday, August 16, 2013 8:13 PM
Subject: Re: [Amps] GU-74b amp by UX1UX


> On 8/16/2013 6:12 PM, Louis Parascondola wrote:
> > The Chinese have come up with the F-257???? or whatever it is to replace 
> > the Russian tubes.  I think Rudy went to them already with Emtron
> Rudy uses the FU728F instead of the GU84B.  The Chinese FU728F is 
> basically a 4CX1500B except it has a different filament voltage and the 
> centering pin in the socket is slightly larger than the one for the 
> 4CX1500B.  Physically the FU728F is quite different than the GU84B so it 
> is not a replacement for it.
> The FU728F is capable of 2500 PEP and 2KW carrier with the voltages 
> supplied. Tune for max screen current without exceeding any of the tubes 
> ratings, then back off on the drive a bit (without retuning) to get a nice 
> clean signal.
> If you run digital or a lot of compression it's likely to kick into high 
> blower which is a bit louder.
> 73
>
> Roger (K8RI)
>
>
> > -----Original Message-----
> > From: Fortra <fortra@siol.net>
> > To: n8de <n8de@thepoint.net>; k3it <gokoyev+k3it@gmail.com>
> > Cc: amps <amps@contesting.com>
> > Sent: Fri, Aug 16, 2013 6:06 pm
> > Subject: Re: [Amps] GU-74b amp by UX1UX
> >
> >
> > Hi Don,
> >
> > you have probably mixed GU-84B with GU-74b...
> > Tube ( s ) in OM-3500 were not GU-74b's...
> > Have not had such worries...bought a Dentron MLA-2500B,
> > with original tubes :) When they failed we will switch to 3cx800 :)
> >
> > Rgds,
> >
> > Nermin S58DX
> > ----- Original Message -----
> > From: <n8de@thepoint.net>
> > To: "k3it" <gokoyev+k3it@gmail.com>
> > Cc: <amps@contesting.com>
> > Sent: Friday, August 16, 2013 9:54 PM
> > Subject: Re: [Amps] GU-74b amp by UX1UX
> >
> >
> > > While attending the Friedrichshafen 'Ham Radio' gathering in June, I
> > > was told that the GU-74b is no longer being manufactured, so is not
> > > available in any large supply for replacement/repair.
> > >
> > > For this reason, the OM-Power people have discontinued the OM-3500 amp
> > > and replaced it with another model.
> > >
> > > Good luck es 73
> > > Don
> > > N8DE
> > >
> > >
> > >
> > >
> > > Quoting k3it <gokoyev+k3it@gmail.com>:
> > >
> > > > Does anybody see any obvious flaws in this amp http://goo.gl/lqPBie
> > > >
> > > > I could not find the actual schematic.
> > > >
> > > > I'm thinking of buying a Ukrainian made amp, for nostalgic reasons :)
> > > >
> > > > 73
> > > > Vasiliy K3IT
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