SB110 Question to Owners - Reply

[Nick England]

Yes, Mr. Johnson, you definitely have a 110 and not a 110A.

I have had a 110 and 110A side-by-side for comparison (along with their
associated manuals). I did this several years ago when corresponding with
Chuck Penson - but somehow he got it backwards in the 2nd edition. I just
went down to the pile o' Heathkits in the basement to check this out again -

The 110 has the heterodyne crystal oscillator V7 (6EA8) mounted on the
Carrier Generator circuit board, not on the chassis. The 110 also has the
crystals associated with V7 mounted 4 in a row on the chassis.

There was a problem caused by the crystal oscillator being on that circuit
board so Heath moved it to the chassis in the 110A.

The 110A has the heterodyne crystal oscillator V7 (6EA8) mounted on the
chassis. The Carrier Generator board (#85-152) has V6, V8, V9, and a blank
spot where V7 used to be. The crystals associated with V7 are arranged 2x2
on the chassis.

Note - that wandering tube is V7 and not V9.

That's my story and I'm sticking to it.
Nick KD4CPL
---------------------------

----- Original Message -----
From: "Mark V. Johnson" <mvjohn at SYMPATICO.CA>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Monday, June 23, 2003 9:19 PM
Subject: SB110 Question to Owners - Reply


> Hello Heath Team;
> Many thanks to the Gentlemen who took the time to reply to my original
> note looking for ways to ID an SB110 and SB110A.
>
> Varying opinions on the subject and thats the fun of working with the
> Team here on the reflector!
>
> I contend my 110 is a true 110 despite the fact that V9 is mounted on
> the Carrier Gen Board.  First is the Blue ID label that has "SB110 531
> 7160A". If  Im correct, the "531" means 1965 production, 31st week.
>
> Second, there is no physical room on the chassis to mount a tube (v9)as
> the Crystal Filter on my rig, is the OLD style similiar to the ones
> found in the SB-300 and is physically bigger than the newer style filters.
>
> Third, I can't grasp why Heath would make  the Carrier Gen Board  with a
> blank space  where V9 would go and mount V9 on the chassis. Why make the
> board bigger than it needs to be if its not needed then move V9 to the
> board on the later version SB110A. I feel it was the other way around.
> V9 started out on the PC baord, there were problems so it was moved to
> the chassis hence leaving a space on the board.
>
> Fourth, The het crystals on mine are mounted in a row of 4 as opposed to
> what I think was the SB110A practice of mounting them  as 2 rows of 2
> with a cover plate.
>
> Again team, not an earth shattering issue...just curious and I'd like to
> get it straight for my own amusement. For those equally obsessed, I can
> send a picture of my unit. Thanks again for the notes and opinions so
> far and for theBandwidth!!!
>
> MV Johnson VE3DJU/VE3DDI
>

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