[50mhz] [Wswss] 6m conversion of an Ameritron AL-572?

[Wayne Overbeck]

During the early 1970s I converted two Heathkit 
SB-200 amplifiers (which use two 572Bs) to six 
meters.  Later I converted one of them again, 
this time to use a single 3-400Z (not 3-500--it 
wouldn't fit).  It required a separate filament 
transformer, among other major changes, but it 
worked really well then.  These days I use a 
homebrew six meter amp with two 3-500Zs in my 
rover vehicle, running on a 3,000-watt inverter 
and heavy batteries--but an amp like that would never 
fit in an SB-200 case.

73,
Wayne, N6NB



--- On Fri, 1/9/09, Chris Boone <Cboone at earthlink.net> wrote:

> From: Chris Boone <Cboone at earthlink.net>
> Subject: Re: [Wswss] [50mhz] 6m conversion of an Ameritron AL-572?
> To: "'Carl'" <km1h at jeremy.mv.com>, "'Danny Pease'" <dpease at adams.net>, w7gj at q.com, "'Magic Band EME'" <magic at 6meme.com>, "'50 MHZ Mailing List'" <50mhz at mailman.qth.net>, "'Rocky Mountain VHF Plus'" <rmvhf at rmvhf.org>, "'Western States Weak Signal Society'" <wswss at mailman.qth.net>, "'PNWVHFS'" <PNWVHFS at googlegroups.com>
> Date: Friday, January 9, 2009, 4:49 PM
> Two 572Bs can do it but its runs them hard...4 572Bs may be
> a problem due to
> capacitance and other factors....(input Z would be half
> that of 2
> tubes...maybe hard to match on 50MHz with reasonable
> efficiency)...BUT I
> would be interested in seeing if it can be done...I have
> been looking at one
> of these amps and thinking "man it would be nice if it
> covered six as well"!
> :)
> 
> Chris
> WB5ITT
> 
> 
> -----Original Message-----
> From: 50mhz-bounces at mailman.qth.net
> [mailto:50mhz-bounces at mailman.qth.net]
> On Behalf Of Carl
> Sent: Friday, January 09, 2009 4:02 PM
> To: Danny Pease; w7gj at q.com; 'Magic Band EME';
> '50 MHZ Mailing List'; 'Rocky
> Mountain VHF Plus'; 'Western States Weak Signal
> Society'; 'PNWVHFS'
> Subject: Re: [50mhz] 6m conversion of an Ameritron AL-572?
> 
> Yup, Ive converted over 250 SB-200's over the years.
> Plus many other tube types.
> 
> Carl
> KM1H
> 
> 
> ----- Original Message ----- 
> From: "Danny Pease" <dpease at adams.net>
> To: <w7gj at q.com>; "'Magic Band
> EME'" <magic at 6meme.com>; "'50 MHZ
> Mailing 
> List'" <50mhz at mailman.qth.net>;
> "'Rocky Mountain VHF Plus'" 
> <rmvhf at rmvhf.org>; "'Western States Weak
> Signal Society'" 
> <wswss at mailman.qth.net>;
> "'PNWVHFS'"
> <PNWVHFS at googlegroups.com>
> Sent: Friday, January 09, 2009 3:54 PM
> Subject: Re: [50mhz] 6m conversion of an Ameritron AL-572?
> 
> 
> > There are a number of SB-200 converted to 6 meters,
> but I don't 
> > remember
> > hearing of any amps that use four 572 tubes working on
> 6 meters. As 
> > was
> > mentioned before, I am quite sure it would have to be
> a 6 meter only
> > conversion rather than just adding 6 meters along with
> HF.
> > Maybe the AL-572 could be traded for a 6 meter amp?
> >
> > NG9R
> >
> >
> > -----Original Message-----
> > From: 50mhz-bounces at mailman.qth.net 
> > [mailto:50mhz-bounces at mailman.qth.net]
> > On Behalf Of Lance Collister
> > Sent: Friday, January 09, 2009 10:08 AM
> > To: Magic Band EME; 50 MHZ Mailing List; Rocky
> Mountain VHF Plus; 
> > Western
> > States Weak Signal Society; PNWVHFS
> > Subject: [50mhz] 6m conversion of an Ameritron AL-572?
> >
> > Hello!
> >
> > K7CA has an Ameritron AL-572 (which uses four 572
> tubes for 160-15m) 
> > and is
> > interested in learning if anyone has had any luck in
> converting this 
> > to 6m
> > (or
> > simply adding the 6m band).  He is interested in
> activating CE on 6m 
> > EME,
> > but
> > currently has no other amp.  Any suggestions or
> guidance would be 
> > greatly
> > appreciated!  MNI TNX and VY 73, Lance
> >
> > -- 
> > Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN,
> WA1JXN/C6A, 
> > ZF2OC/ZF8)
> > P.O. Box 73
> > Frenchtown, MT  59834  USA
> > QTH: DN27UB
> > TEL: (406) 626-5728   URL:
> http://www.bigskyspaces.com/w7gj
> > 2m DXCC #11, 6m DXCC #815
> >
> >
> > Moderator: Ray Brown, KB0STN
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