[AMPS] New tube in a SB230

[Steve Katz]

Could always do what Dentron did in the '2000, mount an 8877 sideways and
hope for the best...

"Each success only buys an admission ticket to a more difficult problem." --
Henry Kissinger

> -----Original Message-----
> From:	Edward Ewell [SMTP:ewell@cvc.net]
> Sent:	Wednesday, September 26, 2001 10:51 AM
> To:	Steve Katz
> Subject:	Re: [AMPS] New tube in a SB230
> 
> 
> Hi Tore:
> 
>       Good thought on the amplifier, the 8873 and 8874 are very expensive
> tubes land
> the 8873 is really hard to get.  The 3CX800A7 tube is an excellent
> replacement.
> 
>       This tube will plug into the socket, and you only have to add a air
> compartment
> and an external blower.  For electrical changes you have to increase the
> warm up time
> to 3 minutes minimum, and add a filament transformer for the 13 volts.
> 
>       The 3CX800A7 tube is equivalent to two 8873 tubes so you would not
> be
> able
> to harm the tube unless you run too much grid drive.  If you tune up
> exactly
> as the
> Heathkit manual you will never harm the tube.  Used 3CX800A7 tubes run
> around
> 250 to 300 dollars (called pulls).  Even if you have to buy a new one for
> 350 dollars
> you would only have to buy one.  It will last a very long time.
> 
>     If you purchased the amp reasonable, after the upgrade you would
> probably only have
> about 300 to 400 invested, and you would have a very good amp.
> 
> Ed    73    K7DXV    in Oregon
> 
> 
> 
> ----- Original Message -----
> From: "Steve Katz" <stevek@jmr.com>
> To: "'Tore Sandström'" <tore.sandstrom@comtech-data.se>;
> <amps@contesting.com>
> Sent: Wednesday, September 26, 2001 11:26 AM
> Subject: RE: [AMPS] New tube in a SB230
> 
> 
> 
> 8874 with little pressurized compartment installed and blower attached?
> Haven't done it, but it always seemed the space was available and Heath
> used
> the conduction cooled tube just because that was a cool thing to do
> (pardon
> the pun).
> 
> WB2WIK/6
> 
> "Each success only buys an admission ticket to a more difficult problem."
> --
> Henry Kissinger
> 
> > -----Original Message-----
> > From: Tore Sandström [SMTP:tore.sandstrom@comtech-data.se]
> > Sent: Wednesday, September 26, 2001 9:51 AM
> > To: amps@contesting.com
> > Subject: [AMPS] New tube in a SB230
> >
> > Hello all!
> > I have a SB230 with a broken 8873. That tube is impossible to get I so
> > wunder tube you guys out there put in instead?
> > Who has done a smart replacement to tell us other?
> > A time ago a saw a SB230 on ebuy with a 3CX800A7 instead, but that is
> also
> > a very expensive tube.
> > Regards
> > Tore Sandstrom SM7CBS
> 
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