[Heath] Heath Digest, Vol 16, Issue 17
Lou
beethoven1 at sbcglobal.net
Thu Apr 19 19:33:06 EDT 2012
Tnx to all that replied...Now what I need are the alignment instructions for SB-100..
Tnx
Lou..
----- Original Message -----
From: <heath-request at puck.nether.net>
To: <heath at puck.nether.net>
Sent: Thursday, April 19, 2012 2:17 PM
Subject: Heath Digest, Vol 16, Issue 17
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> Today's Topics:
>
> 1. Re: SB 100 and SB 102 (Glen Zook)
> 2. Re: SB 100 and SB 102 (Brian Wood)
> 3. Re: SB 100 and SB 102 (Kenneth G. Gordon)
> 4. Re: SB-200 Part info (Kenneth G. Gordon)
> 5. Re: SB 100 and SB 102 (G3OOU at aol.com)
> 6. Re: SB 100 and SB 102 (Kenneth G. Gordon)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 19 Apr 2012 08:12:29 -0700 (PDT)
> From: Glen Zook <gzook at yahoo.com>
> To: Lou <beethoven1 at sbcglobal.net>, "heath at puck.nether.net"
> <heath at puck.nether.net>
> Subject: Re: [Heath] SB 100 and SB 102
> Message-ID:
> <1334848349.10990.YahooMailNeo at web121701.mail.ne1.yahoo.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> First of all, the LMO in the SB-102 is solid-state and the LMO in both the SB-100 and SB-101 are tube type.
>
> Next, both the SB-101 and SB-102 came with the switch and circuitry so that the 400 Hz CW filter can be installed. ?The SB-100 does not have this.
>
> The SB-101 and SB-102 have a switch position that allows frequency control from the external LMO (both receive and transmit) and the SB-100 does not have this.
>
> There are 2 "spare" RCA jacks on the back of both the SB-101 and SB-102 which are not present in the SB-100.
>
> The SB-100 and SB-101 use a 6AU6 as the receiver "front end" and the SB-102 uses a 6HS6 which gives a slight improvement. ?Unfortunately, the 6HS6 tubes are scarce these days and most have gone back to the 6AU6 when that tube goes bad.
>
> Some SB-102 units came with solid-state LMOs not built by TRW. ?Those non-TRW LMOs often have problems "tracking" frequency between the 100 kHz points. ?That is, the calibration can be "way off" at the 1 kHz marks on the dial although generally accurate at the 100 kHz marks. ?The TRW LMOs track well within 1 kHz at the points between the 100 kHz marks.
> ?
> Glen, K9STH
>
>
> Website: http://k9sth.com
>
>
> ________________________________
> From: Lou <beethoven1 at sbcglobal.net>
> To: heath at puck.nether.net
> Sent: Wednesday, April 18, 2012 9:00 PM
> Subject: [Heath] SB 100 and SB 102
>
>
>
> Can someone tell me the specific differences
> between the SB-100 and the SB -102..I don't have the manual for the SB
> 100....
> ?
> Tnx
> _______________________________________________
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> Heath at puck.nether.net
> https://puck.nether.net/mailman/listinfo/heath
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> ------------------------------
>
> Message: 2
> Date: Thu, 19 Apr 2012 09:21:03 -0600
> From: "Brian Wood" <wood at lpbroadband.net>
> To: "'Lou'" <beethoven1 at sbcglobal.net>
> Cc: heath at puck.nether.net
> Subject: Re: [Heath] SB 100 and SB 102
> Message-ID: <005701cd1e40$09e930f0$1dbb92d0$@lpbroadband.net>
> Content-Type: text/plain; charset="us-ascii"
>
> The SB-101 was the same as an SB-100 except for the CW filter and the
> ability to use an external LMO (the SB-640) so you could have independent
> control of transmit and receive frequencies. There were also two new phono
> jacks on the rear panel for easier connection of the SB-610 or -620. The
> SB-102 added a solid state LMO and improved receiver sensitivity (mainly by
> replacing the 6AU6 with a 6HS6), and upgrade kits for the latter improvement
> were made available for the SB-101. There was also an accessory jack on the
> SB-102 that allowed for connection of the SB-500 transverter.
>
>
>
> Brian, W0DZ
>
>
>
>
>
> From: heath-bounces at puck.nether.net [mailto:heath-bounces at puck.nether.net]
> On Behalf Of Lou
> Sent: Wednesday, April 18, 2012 8:00 PM
> To: heath at puck.nether.net
> Subject: [Heath] SB 100 and SB 102
>
>
>
> Can someone tell me the specific differences between the SB-100 and the SB
> -102..I don't have the manual for the SB 100....
>
>
>
> Tnx
>
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> ------------------------------
>
> Message: 3
> Date: Thu, 19 Apr 2012 08:37:56 -0700
> From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
> To: Lou <beethoven1 at sbcglobal.net>
> Cc: HeathKit <heath at puck.nether.net>
> Subject: Re: [Heath] SB 100 and SB 102
> Message-ID: <4F903154.32045.2C48D1E4 at kgordon2006.frontier.com>
> Content-Type: text/plain; charset=US-ASCII
>
> On 18 Apr 2012 at 19:00, Lou wrote:
>
>> Can someone tell me the specific differences between the SB-100 and
>> the SB -102..I don't have the manual for the SB 100....
>
> There are quite a few.
>
> For one thing, and the most obvious, all SB-102s used a solid-state LMO.
>
> There are many differences in other parts of the various circuits.
>
> The AGC is a bit different,
>
> the "S" meter circuitry is different (in fact, there are at least three different "S"
> meter circuits in the SB-102s alone)
>
> there are certain differences in the biasing and screen voltages for several
> stages,
>
> the HP-23 power supply used with the SB-100 has lower B++ than the later
> power supplies,
>
> the SB-102 used the 6HS6 instead of the earlier rigs' 6AU6 at the receiver
> RF and 1st mixer (so did the later SB-101s and HW-101s),
>
> the SB-102 has added oscillator for use with crystal control,
>
> late SB-101s and all SB-102s were setup with a molex connector and special
> switching for use with either an external LMO (the SB-640), or with
> transverters,
>
> some SB-101s and SB-102s had glass-epoxy rather than phenolic boards for
> the small circuit boards that contains the parts around the bandswitch,
>
> if I am not mistaken, the SB-102 came stock with the 400 Hz CW filter
> whereas that was optional with the earlier rigs,
>
> etc.
>
> I modified my first SB-100 to an SB-101 standard shortly after I got it, but
> that was at least 50 years ago, and I cannot now remember all the changes I
> made at the time.
>
> Perhap Bob G3OOU, or Glenn Zook, can fill us in on more details. Both of
> those folks are experts at those rigs.
>
> Heathkit seems to have had particular trouble with making the "S" meter
> stable. They used several different versions in all their SB/HW allbanders.
>
> Ken W7EKB
>
>
> ------------------------------
>
> Message: 4
> Date: Thu, 19 Apr 2012 08:38:51 -0700
> From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
> To: rharris283 at aol.com
> Cc: HeathKit <heath at puck.nether.net>
> Subject: Re: [Heath] SB-200 Part info
> Message-ID: <4F90318B.30676.2C49A86E at kgordon2006.frontier.com>
> Content-Type: text/plain; charset=US-ASCII
>
> On 19 Apr 2012 at 0:25, rharris283 at aol.com wrote:
>
>>
>> I have an SB-200 that is missing the 10 meter 68 pf Silver Mica cap
>> for the tuned input. I just need to know the voltage of these. 500V or
>> 1KV? The rest of this amp looks like it was hardly used! Someone had
>> cut the cap out at one time. Manual just gives the part # 20-76 and
>> the 68 pf. Thanks, Bob WB2UBW
>
> 500 V
>
> Ken W7EKB
>
>
> ------------------------------
>
> Message: 5
> Date: Thu, 19 Apr 2012 14:06:20 -0400 (EDT)
> From: G3OOU at aol.com
> To: kgordon2006 at frontier.com, beethoven1 at sbcglobal.net
> Cc: heath at puck.nether.net
> Subject: Re: [Heath] SB 100 and SB 102
> Message-ID: <1d4b0.952a701.3cc1ae1c at aol.com>
> Content-Type: text/plain; charset="us-ascii"
>
>
>
> In a message dated 19/04/2012 17:23:30 GMT Standard Time,
> kgordon2006 at frontier.com writes:
>
>
>> Can someone tell me the specific differences between the SB-100 and
>> the SB -102..I don't have the manual for the SB 100....
>
>
>
>
> Hi All
>
> One additional item is that you can use the 6AH6 instead of the 6AU6 in the
> receiver RF stage but you also need to change another 6AU6 to a 6AH6 or
> use a balancing resistor on the opposite heater rail to equalise the heater
> currents - the 6AH6 requires 0.45A whereas the 6AU6 requires 0.30A.
>
> Personally I find the SB-101 receiver sensitivity perfectly adequate on all
> bands except possibly 10m and with an evening noise level of S7-S8 on 80m
> and 160m (special conversion) the extra gain from the 6AH6 is just not
> required.
>
> 73
>
> Bob
>
> Bob F Burns
> C Eng, FIET, MSE
> Amateur Radio Callsign: G3OOU
> Registered RSGB Instructor
> G-QRP Member No: 6907; Zone: 14, QRA: IO91WH; WAB: TQ25
> Secretary of Crystal Palace Radio & Electronics Club: _www.g3oou.co.uk_
> (http://www.g3oou.co.uk/)
> Technical web site: _www.qsl.net/g3oou_ (http://www.qsl.net/g3oou)
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> ------------------------------
>
> Message: 6
> Date: Thu, 19 Apr 2012 10:49:45 -0700
> From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
> To: Glen Zook <gzook at yahoo.com>
> Cc: HeathKit <heath at puck.nether.net>
> Subject: Re: [Heath] SB 100 and SB 102
> Message-ID: <4F905039.13110.2CC181D3 at kgordon2006.frontier.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> On 19 Apr 2012 at 8:12, Glen Zook wrote:
>
>> The SB-100 and SB-101 use a 6AU6 as the receiver "front end" and the
>> SB-102 uses a 6HS6 which gives a slight improvement.
>
> More than "slight", in my experience and testing...
>
>> ?Unfortunately,
>> the 6HS6 tubes are scarce these days and most have gone back to the
>> 6AU6 when that tube goes bad...
>
> ...which they do very quickly since they are running beyond their maximum
> ratings...
>
> I have found that the 6AH6 will replace either the 6AU6 or the 6HS6 and will
> work better than either of the other two tubes.
>
> First of all, the 6AH6 is far more robust, far more easily available, and much
> cheaper than the 6HS6, and it has identical filament current requirements
> and almost identical transconductance.
>
> It provides almost identical enhancement of RF gain, and the much lower
> noise that the 6HS6 does.
>
> I use 6AH6s routinely in all SB/HW all-banders that I restore.
>
> Be aware that since the filament string in the SB-100/101/102/HW-
> 100/101/101W are connected in series-parallel, that BOTH the receiver RF
> amp and the 1st receiver mixer must be exchanged together at once,
> otherwise the filament string will become unbalanced.
>
> The 6AU6 draws less filament current than either of the other two tubes
> mentioned, and if you use a 6AU6 as the 1st receiver mixer, and either the
> 6HS6 or the 6AH6 as the RF amp, or vice versa, the filament string will
> become unbalanced.
>
> Since the receiver RF amp and the 1st receiver mixer are on opposite sides
> of that series-parallel filament string, replacing both of those two tubes with
> tubes with higher filament current requirements will enable the filament string
> to remain balanced.
>
> Also, don't forget that in the SB-102 one of the tubes was changed from a
> single-section tube to a dual-section tube, and that other section was used
> as an optional crystal oscillator for crystal control of the transceiver
> frequency.
>
> Ken W7EKB
>
>
>
> ------------------------------
>
> _______________________________________________
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>
> End of Heath Digest, Vol 16, Issue 17
> *************************************
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