[Heathkit] Re: Heathkit digest, Vol 4 #413 - 8 msgs
NR5A
[email protected]
Mon, 1 Mar 2004 10:24:18 -0700
I'm wondering is there any way of telling the rough age of a piece of Heath
equipment by its serial number? The serial number of my HW-16 is 07313.
Jerry - NR5A - South Dakota
----- Original Message -----
From: <[email protected]>
To: <[email protected]>
Sent: Monday, March 01, 2004 2:13 AM
Subject: Heathkit digest, Vol 4 #413 - 8 msgs
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> Today's Topics:
>
> 1. Re: OFF TOPIC. I THINK (B Riches)
> 2. IM-28 VTVM MANUAL (Ed Worst)
> 3. re off topic i think (Murray Grandy)
> 4. Re: re off topic i think (=?Windows-1252?Q?Tom_N=D8JMY_-_AAR7FV?=)
> 5. Re: re off topic i think (James M. Walker)
> 6. Re: re off topic i think (=?iso-8859-1?Q?Tom_N=D8JMY_-_AAR7FV?=)
> 7. NE-2H ? Neon (RJ Mattson)
> 8. Re: NE-2H ? Neon (wa6fwf)
>
> --__--__--
>
> Message: 1
> From: "B Riches" <[email protected]>
> To: "Murray Grandy" <[email protected]>,
> "heathkit list" <[email protected]>
> Subject: Re: [Heathkit] OFF TOPIC. I THINK
> Date: Sun, 29 Feb 2004 08:40:19 -0500
>
> 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
> ----- Original Message -----=20
> From: Murray Grandy=20
> To: heathkit list=20
> Sent: Sunday, February 29, 2004 12:51 AM
> Subject: [Heathkit] OFF TOPIC. I THINK
>
>
> IS THERE ANYONE HERE WHO CAN EXPLAIN THE FOLLOWING. 5AR4/GZ34 =
> RECTIFIER
> TUBE, AND 5AS4 DIFFERENCE. BOTH HAVE THE SAME CONNECTIONS. THE 5AR4 =
> HAS A
> SEPARATE CATHODE, ALTHOUGH IT IS CONNECTED TO THE FILAMENT PIN #8. THE =
> 5AS4
> DOES NOT HAVE THE CATHODE AS SUCH. ARE THESE TUBES INTERCHANGEABLE. IF =
> NOT,
> WHY NOT. DOES IT REALLY MAKE THAT MUCH DIFFERENCE.
> MURRAY (VE7MGY)
>
>
> _______________________________________________
> List Administrator: Duane Fischer, W8DBF =20
> ** For Assistance: [email protected] ** =20
> $$ See the vintage area on the HCI web site - http://www.w9wze.org $$=20
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>
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> Message: 2
> From: "Ed Worst" <[email protected]>
> To: <[email protected]>
> Date: Sun, 29 Feb 2004 08:32:18 -0600
> Subject: [Heathkit] IM-28 VTVM MANUAL
>
> Hello to the list. I just bought an IM-28 VTVM, but there's no manual. I
> checked BAMA, but no luck there. Is anyone willing to make a copy of
their
> manual for me? I will gladly pay copying cost plus postage. Thanks.
ed -
> k9ew
>
>
> --__--__--
>
> Message: 3
> From: "Murray Grandy" <[email protected]>
> To: "heathkit list" <[email protected]>
> Date: Sun, 29 Feb 2004 08:31:07 -0800
> 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
>
>
>
> --__--__--
>
> Message: 4
> From: =?Windows-1252?Q?Tom_N=D8JMY_-_AAR7FV?= <[email protected]>
> To: "heathkit list" <[email protected]>
> Subject: Re: [Heathkit] re off topic i think
> Date: Sun, 29 Feb 2004 10:36:56 -0600
>
> 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
> >
>
>
>
> --__--__--
>
> Message: 5
> Date: Sun, 29 Feb 2004 14:09:58 -0500
> From: "James M. Walker" <[email protected]>
> Organization: REAL-RADIO WB2FCN Buffalo, NY
> Cc: heathkit list <[email protected]>
> 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 N�JMY - 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
>
> --__--__--
>
> Message: 6
> From: =?iso-8859-1?Q?Tom_N=D8JMY_-_AAR7FV?= <[email protected]>
> To: "James M. Walker" <[email protected]>
> Cc: "heathkit list" <[email protected]>
> Subject: Re: [Heathkit] re off topic i think
> Date: 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 N�JMY - 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
> >
>
>
>
> --__--__--
>
> Message: 7
> From: "RJ Mattson" <[email protected]>
> To: "Heathkit Mailing List" <[email protected]>
> Date: Sun, 29 Feb 2004 17:24:16 -0500
> Subject: [Heathkit] NE-2H ? Neon
>
> The neon bulb on my SB-610 has been flickering and noticed the lead has =
> broken off right at the glass seal.
> I believe the lamp reads NE-2H but the Heath parts only refers to their =
> part # 412-15
> It is in series with a 82k resistor and across 215 vdc.
> Can I replace it with a NE-51H or do neons have different currents and =
> voltages?
> Thanks,
> bob...w2ami
> www.qrz.com/callsign/w2ami
>
>
> --- StripMime Report -- processed MIME parts ---
> multipart/alternative
> text/plain (text body -- kept)
> text/html
> The reason this message is shown is because the post was in HTML
> or had an attachment. Attachments are not allowed. To learn how
> to post in Plain-Text go to: http://www.expita.com/nomime.html ---
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> --__--__--
>
> Message: 8
> From: wa6fwf <[email protected]>
> To: "RJ Mattson" <[email protected]>
> Subject: Re: [Heathkit] NE-2H ? Neon
> Date: Sun, 29 Feb 2004 15:12:46 -0800
> Cc: "Heathkit Mailing List" <[email protected]>
>
> On Sunday 29 February 2004 14:24, RJ Mattson wrote:
> > The neon bulb on my SB-610 has been flickering and noticed the lead has
> > broken off right at the glass seal. I believe the lamp reads NE-2H but
the
> > Heath parts only refers to their part # 412-15 It is in series with a
82k
> > resistor and across 215 vdc.
> > Can I replace it with a NE-51H or do neons have different currents and
> > voltages? Thanks,
> > bob...w2ami
> > www.qrz.com/callsign/w2ami
> >
> NE51H-USA bulb specifications:
> category:
> Neon Glow
> volts:
> 105 - 125
> amp/watt:
> .001A / .14W
>
> NE2H-USA bulb specifications:
> category:
> Neon Glow
> volts:
> 105 - 125
> amp/watt:
> .002A / .25W
>
> it wont be as bright and you would need to change the dropping resistor,
> might be easier to go to radio shack and get the original ne-2h I
"think"
> the radio shack part number is a 272-1102
>
> 73
> Kevin
> WA6FWF
>
>
>
>
> --__--__--
>
> _______________________________________________
> 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
>
>
> End of Heathkit Digest
>