[Heathkit] re off topic i think

Sun, 29 Feb 2004 13:22:49 -0600

Well, I guess I forgot about that.  You're right, I've seen some shorter
ones from time to time.

73,
Tom
----- Original Message ----- 
From: "James M. Walker" <[email protected]>
Cc: "heathkit list" <[email protected]>
Sent: Sunday, February 29, 2004 1:09 PM
Subject: Re: [Heathkit] re off topic i think

> I would like to mention,
> I substituted the 5U4GB, in my Eico 720 and also my 723, the height of
> the tub depends on the type of 5U4 you have available. They work great
> no problems so far more than 5 years now.
>
> Jim
> WB2FCN
> http://eshop1.chem.buffalo.edu
>
>
> Tom NØJMY - AAR7FV wrote:
> >
> > The good ol' Eico 720 xmtr used the 5AR4 as well but for a different
reason.
> > The 5AR4 is high enough power, but still short enough to fit in the low
> > profile cabinet.  5U4 wouldn't fit!
> >
> > 73,
> > Tom----- Original Message -----
> > From: "Murray Grandy" <[email protected]>
> > To: "heathkit list" <[email protected]>
> > Sent: Sunday, February 29, 2004 10:31 AM
> > Subject: [Heathkit] re off topic i think
> >
> > > It's amazing what you miss when you're trying to go the cheep route.
Of
> > > course I am aware of these differences and they make sense. Just
didn't
> > > think. Guess that is why 5AR4's sell for several times the cost of
5U4's
> > and
> > > other similar rectifiers. I was going to use the 5AS4 in a Dynaco
ST-70.
> > > Guess I will look for the real thing. Thanks to all for the great
info.
> > > Murray
> > >
> >
****************************************************************************
> > > ***********
> > > The 5ar4 cathode is indirectly heated - meaning it takes 15-30 seconds
to
> > > start working - the 5as4 filament is the cathode - heating up in a few
> > > seconds.  5ar4 is a good idea as the other tubes in the piece of
equipment
> > > have warmed up and will be ready to draw current when the rectifier
warms
> > > up.  The prevents the high voltage from attempting to rise to a much
> > higher
> > > value as it would with a directly heated rectifier or solid state
diode -
> > > therefore stressing the filter condencers until the other tubes have
> > warmed
> > > up sufficently to draw current.
> > >
> > > Regards,
> > >
> > > Bill Riches, WA2DVU
> > > Cape May, NJ
> > >
> > >
> > > _______________________________________________
> > > List Administrator: Duane Fischer, W8DBF
> > > ** For Assistance: [email protected] **
> > > $$ See the vintage area on the HCI web site - http://www.w9wze.org $$
> > > Heathkit mailing list
> > > [email protected]
> > > http://mailman.qth.net/mailman/listinfo/heathkit
> > >
> >
> > _______________________________________________
> > List Administrator: Duane Fischer, W8DBF
> > ** For Assistance: [email protected] **
> > $$ See the vintage area on the HCI web site - http://www.w9wze.org $$
> > Heathkit mailing list
> > [email protected]
> > http://mailman.qth.net/mailman/listinfo/heathkit
> _______________________________________________
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: [email protected] **
> $$ See the vintage area on the HCI web site - http://www.w9wze.org $$
> Heathkit mailing list
> [email protected]
> http://mailman.qth.net/mailman/listinfo/heathkit
>