[Amps] SB-220 Filament Transformer ME TOO

[Mike Hyder --N4NT--]

Thanks for your reply.  I don't understand why, if it's an exact
replacement, you must mount it on the rear?  One disadvantage of the heavier
duty filament transformer might be that it doesn't limit filament inrush
current the way the original transformer did?  Does that Dahl transformer
supply just under 5 volts the way the original one did -- that greatly
prolongs tube life?

73, Mike N4NT

----- Original Message ----- 
From: "AA6DX" <aa6dx at pacbell.net>
To: "Mike Hyder --N4NT--" <N4NT_Mike.Hyder at charter.net>; "K7ZS"
<k7zs at earthlink.net>; <amps at contesting.com>
Sent: Tuesday, September 30, 2003 12:22 PM
Subject: Re: [Amps] SB-220 Filament Transformer ME TOO


> I will try to get to the back of my PD powered 220 today to get the info
on
> the filament xfmr mounted on the rear...
> Innameantime ... here's scoop from PD ...
> 73, Mark  AA6DX
> ================================================================
> HEATH SB-220 FIL XFMR 50 HZ
> EXACT REPLACEMENT TRANSFORMER
> CORE) EI-137 X 1.375         STYLE #) 05  E-I LAMINATED CORE
> PR) 120/240 VAC 50 HZ 1 PH
>
> S1) 5.0 VCT @ 30A CCS
>
> S2) 90 VAC @ 0.1A CCS
>
> DM) HT =  4.125 WT =  3.438 DT =  3.750 MD =  2.375 MW =  2.750
> PRICE)    $145.00 Plus S&H FOB El Paso, TX    WEIGHT)    6  LBS
>
> ================================================================
> HEATH SB-220 FILAMENT XFMR
> EXACT REPLACEMENT TRANSFORMER
> CORE) EI-137 X 1.375         STYLE #) 05  E-I LAMINATED CORE
> PR) 120/240 VAC 60 HZ 1 PH
>
> S1) 5.0 VCT @ 30A CCS
>
> S2) 90 VAC @ 0.1A CCS
>
> DM) HT =  4.125 WT =  4.125 DT =  3.108 MD =  2.750 MW =  2.375
> PRICE)    $145.00 Plus S&H FOB El Paso, TX    WEIGHT)    6  LBS
>
> ================================================================
>
>
> ----- Original Message ----- 
> From: "Mike Hyder --N4NT--" <N4NT_Mike.Hyder at charter.net>
> To: "K7ZS" <k7zs at earthlink.net>; <amps at contesting.com>
> Sent: Monday, September 29, 2003 7:27 AM
> Subject: Re: [Amps] SB-220 Filament Transformer ME TOO
>
>
> > I am also looking for such transformer.  Mine got wiped out in a
lightning
> > storm (along with a miriad of other stuff).  If you find a source (I
> already
> > know of Peter Dahl) please advise.
> >
> > Thanks, Mike N4NT
> >
> > ----- Original Message ----- 
> > From: "K7ZS" <k7zs at earthlink.net>
> > To: <amps at contesting.com>
> > Sent: Sunday, September 28, 2003 12:06 PM
> > Subject: [Amps] SB-220 Filament Transformer
> >
> >
> > > Hello all.
> > >
> > > I am refurbishing an SB-220 for a friend, and it appears the
> filament/bias
> > > transformer has been cooked.
> > >
> > > Obviously, I need to find someone with a spare, get it rewound or buy
a
> > new
> > > one.
> > >
> > > Sources for any or all of the above would be appreciated.
> > >
> > > Thanks
> > >
> > > Kevin K7ZS
>
>